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  *      Copyright (C) 2010      Johan Hovold (jhovold@gmail.com)
   7  *
   8  *      This program is free software; you can redistribute it and/or modify
   9  *      it under the terms of the GNU General Public License as published by
  10  *      the Free Software Foundation; either version 2 of the License, or
  11  *      (at your option) any later version.
  12  *
  13  * This driver allows a USB IrDA device to be used as a "dumb" serial device.
  14  * This can be useful if you do not have access to a full IrDA stack on the
  15  * other side of the connection.  If you do have an IrDA stack on both devices,
  16  * please use the usb-irda driver, as it contains the proper error checking and
  17  * other goodness of a full IrDA stack.
  18  *
  19  * Portions of this driver were taken from drivers/net/irda/irda-usb.c, which
  20  * was written by Roman Weissgaerber <weissg@vienna.at>, Dag Brattli
  21  * <dag@brattli.net>, and Jean Tourrilhes <jt@hpl.hp.com>
  22  *
  23  * See Documentation/usb/usb-serial.txt for more information on using this
  24  * driver
  25  *
  26  * 2008_Jun_02  Felipe Balbi <me@felipebalbi.com>
  27  *      Introduced common header to be used also in USB Gadget Framework.
  28  *      Still needs some other style fixes.
  29  *
  30  * 2007_Jun_21  Alan Cox <alan@lxorguk.ukuu.org.uk>
  31  *      Minimal cleanups for some of the driver problens and tty layer abuse.
  32  *      Still needs fixing to allow multiple dongles.
  33  *
  34  * 2002_Mar_07  greg kh
  35  *      moved some needed structures and #define values from the
  36  *      net/irda/irda-usb.h file into our file, as we don't want to depend on
  37  *      that codebase compiling correctly :)
  38  *
  39  * 2002_Jan_14  gb
  40  *      Added module parameter to force specific number of XBOFs.
  41  *      Added ir_xbof_change().
  42  *      Reorganized read_bulk_callback error handling.
  43  *      Switched from FILL_BULK_URB() to usb_fill_bulk_urb().
  44  *
  45  * 2001_Nov_08  greg kh
  46  *      Changed the irda_usb_find_class_desc() function based on comments and
  47  *      code from Martin Diehl.
  48  *
  49  * 2001_Nov_01  greg kh
  50  *      Added support for more IrDA USB devices.
  51  *      Added support for zero packet.  Added buffer override paramater, so
  52  *      users can transfer larger packets at once if they wish.  Both patches
  53  *      came from Dag Brattli <dag@obexcode.com>.
  54  *
  55  * 2001_Oct_07  greg kh
  56  *      initial version released.
  57  */
  58
  59 #include <linux/kernel.h>
  60 #include <linux/errno.h>
  61 #include <linux/init.h>
  62 #include <linux/slab.h>
  63 #include <linux/tty.h>
  64 #include <linux/tty_driver.h>
  65 #include <linux/tty_flip.h>
  66 #include <linux/module.h>
  67 #include <linux/spinlock.h>
  68 #include <linux/uaccess.h>
  69 #include <linux/usb.h>
  70 #include <linux/usb/serial.h>
  71 #include <linux/usb/irda.h>
  72
  73 /*
  74  * Version Information
  75  */
  76 #define DRIVER_VERSION "v0.5"
  77 #define DRIVER_AUTHOR "Greg Kroah-Hartman <greg@kroah.com>, Johan Hovold <jhovold@gmail.com>"
  78 #define DRIVER_DESC "USB IR Dongle driver"
  79
  80 static int debug;
  81
  82 /* if overridden by the user, then use their value for the size of the read and
  83  * write urbs */
  84 static int buffer_size;
  85
  86 /* if overridden by the user, then use the specified number of XBOFs */
  87 static int xbof = -1;
  88
  89 static int  ir_startup (struct usb_serial *serial);
  90 static int  ir_open(struct tty_struct *tty, struct usb_serial_port *port);
  91 static int ir_prepare_write_buffer(struct usb_serial_port *port,
  92                                                 void *dest, size_t size);
  93 static void ir_process_read_urb(struct urb *urb);
  94 static void ir_set_termios(struct tty_struct *tty,
  95                 struct usb_serial_port *port, struct ktermios *old_termios);
  96
  97 /* Not that this lot means you can only have one per system */
  98 static u8 ir_baud;
  99 static u8 ir_xbof;
 100 static u8 ir_add_bof;
 101
 102 static const struct usb_device_id ir_id_table[] = {
 103         { USB_DEVICE(0x050f, 0x0180) },         /* KC Technology, KC-180 */
 104         { USB_DEVICE(0x08e9, 0x0100) },         /* XTNDAccess */
 105         { USB_DEVICE(0x09c4, 0x0011) },         /* ACTiSys ACT-IR2000U */
 106         { USB_INTERFACE_INFO(USB_CLASS_APP_SPEC, USB_SUBCLASS_IRDA, 0) },
 107         { }                                     /* Terminating entry */
 108 };
 109
 110 MODULE_DEVICE_TABLE(usb, ir_id_table);
 111
 112 static struct usb_driver ir_driver = {
 113         .name           = "ir-usb",
 114         .probe          = usb_serial_probe,
 115         .disconnect     = usb_serial_disconnect,
 116         .id_table       = ir_id_table,
 117         .no_dynamic_id  = 1,
 118 };
 119
 120 static struct usb_serial_driver ir_device = {
 121         .driver = {
 122                 .owner  = THIS_MODULE,
 123                 .name   = "ir-usb",
 124         },
 125         .description            = "IR Dongle",
 126         .usb_driver             = &ir_driver,
 127         .id_table               = ir_id_table,
 128         .num_ports              = 1,
 129         .set_termios            = ir_set_termios,
 130         .attach                 = ir_startup,
 131         .open                   = ir_open,
 132         .prepare_write_buffer   = ir_prepare_write_buffer,
 133         .process_read_urb       = ir_process_read_urb,
 134 };
 135
 136 static inline void irda_usb_dump_class_desc(struct usb_irda_cs_descriptor *desc)
 137 {
 138         dbg("bLength=%x", desc->bLength);
 139         dbg("bDescriptorType=%x", desc->bDescriptorType);
 140         dbg("bcdSpecRevision=%x", __le16_to_cpu(desc->bcdSpecRevision));
 141         dbg("bmDataSize=%x", desc->bmDataSize);
 142         dbg("bmWindowSize=%x", desc->bmWindowSize);
 143         dbg("bmMinTurnaroundTime=%d", desc->bmMinTurnaroundTime);
 144         dbg("wBaudRate=%x", __le16_to_cpu(desc->wBaudRate));
 145         dbg("bmAdditionalBOFs=%x", desc->bmAdditionalBOFs);
 146         dbg("bIrdaRateSniff=%x", desc->bIrdaRateSniff);
 147         dbg("bMaxUnicastList=%x", desc->bMaxUnicastList);
 148 }
 149
 150 /*------------------------------------------------------------------*/
 151 /*
 152  * Function irda_usb_find_class_desc(dev, ifnum)
 153  *
 154  *    Returns instance of IrDA class descriptor, or NULL if not found
 155  *
 156  * The class descriptor is some extra info that IrDA USB devices will
 157  * offer to us, describing their IrDA characteristics. We will use that in
 158  * irda_usb_init_qos()
 159  *
 160  * Based on the same function in drivers/net/irda/irda-usb.c
 161  */
 162 static struct usb_irda_cs_descriptor *
 163 irda_usb_find_class_desc(struct usb_device *dev, unsigned int ifnum)
 164 {
 165         struct usb_irda_cs_descriptor *desc;
 166         int ret;
 167
 168         desc = kzalloc(sizeof(*desc), GFP_KERNEL);
 169         if (!desc)
 170                 return NULL;
 171
 172         ret = usb_control_msg(dev, usb_rcvctrlpipe(dev, 0),
 173                         USB_REQ_CS_IRDA_GET_CLASS_DESC,
 174                         USB_DIR_IN | USB_TYPE_CLASS | USB_RECIP_INTERFACE,
 175                         0, ifnum, desc, sizeof(*desc), 1000);
 176
 177         dbg("%s -  ret=%d", __func__, ret);
 178         if (ret < sizeof(*desc)) {
 179                 dbg("%s - class descriptor read %s (%d)",
 180                                 __func__,
 181                                 (ret < 0) ? "failed" : "too short",
 182                                 ret);
 183                 goto error;
 184         }
 185         if (desc->bDescriptorType != USB_DT_CS_IRDA) {
 186                 dbg("%s - bad class descriptor type", __func__);
 187                 goto error;
 188         }
 189
 190         irda_usb_dump_class_desc(desc);
 191         return desc;
 192
 193 error:
 194         kfree(desc);
 195         return NULL;
 196 }
 197
 198 static u8 ir_xbof_change(u8 xbof)
 199 {
 200         u8 result;
 201
 202         /* reference irda-usb.c */
 203         switch (xbof) {
 204         case 48:
 205                 result = 0x10;
 206                 break;
 207         case 28:
 208         case 24:
 209                 result = 0x20;
 210                 break;
 211         default:
 212         case 12:
 213                 result = 0x30;
 214                 break;
 215         case  5:
 216         case  6:
 217                 result = 0x40;
 218                 break;
 219         case  3:
 220                 result = 0x50;
 221                 break;
 222         case  2:
 223                 result = 0x60;
 224                 break;
 225         case  1:
 226                 result = 0x70;
 227                 break;
 228         case  0:
 229                 result = 0x80;
 230                 break;
 231         }
 232
 233         return(result);
 234 }
 235
 236 static int ir_startup(struct usb_serial *serial)
 237 {
 238         struct usb_irda_cs_descriptor *irda_desc;
 239
 240         irda_desc = irda_usb_find_class_desc(serial->dev, 0);
 241         if (!irda_desc) {
 242                 dev_err(&serial->dev->dev,
 243                         "IRDA class descriptor not found, device not bound\n");
 244                 return -ENODEV;
 245         }
 246
 247         dbg("%s - Baud rates supported:%s%s%s%s%s%s%s%s%s",
 248                 __func__,
 249                 (irda_desc->wBaudRate & USB_IRDA_BR_2400) ? " 2400" : "",
 250                 (irda_desc->wBaudRate & USB_IRDA_BR_9600) ? " 9600" : "",
 251                 (irda_desc->wBaudRate & USB_IRDA_BR_19200) ? " 19200" : "",
 252                 (irda_desc->wBaudRate & USB_IRDA_BR_38400) ? " 38400" : "",
 253                 (irda_desc->wBaudRate & USB_IRDA_BR_57600) ? " 57600" : "",
 254                 (irda_desc->wBaudRate & USB_IRDA_BR_115200) ? " 115200" : "",
 255                 (irda_desc->wBaudRate & USB_IRDA_BR_576000) ? " 576000" : "",
 256                 (irda_desc->wBaudRate & USB_IRDA_BR_1152000) ? " 1152000" : "",
 257                 (irda_desc->wBaudRate & USB_IRDA_BR_4000000) ? " 4000000" : "");
 258
 259         switch (irda_desc->bmAdditionalBOFs) {
 260         case USB_IRDA_AB_48:
 261                 ir_add_bof = 48;
 262                 break;
 263         case USB_IRDA_AB_24:
 264                 ir_add_bof = 24;
 265                 break;
 266         case USB_IRDA_AB_12:
 267                 ir_add_bof = 12;
 268                 break;
 269         case USB_IRDA_AB_6:
 270                 ir_add_bof = 6;
 271                 break;
 272         case USB_IRDA_AB_3:
 273                 ir_add_bof = 3;
 274                 break;
 275         case USB_IRDA_AB_2:
 276                 ir_add_bof = 2;
 277                 break;
 278         case USB_IRDA_AB_1:
 279                 ir_add_bof = 1;
 280                 break;
 281         case USB_IRDA_AB_0:
 282                 ir_add_bof = 0;
 283                 break;
 284         default:
 285                 break;
 286         }
 287
 288         kfree(irda_desc);
 289
 290         return 0;
 291 }
 292
 293 static int ir_open(struct tty_struct *tty, struct usb_serial_port *port)
 294 {
 295         int i;
 296
 297         dbg("%s - port %d", __func__, port->number);
 298
 299         for (i = 0; i < ARRAY_SIZE(port->write_urbs); ++i)
 300                 port->write_urbs[i]->transfer_flags = URB_ZERO_PACKET;
 301
 302         /* Start reading from the device */
 303         return usb_serial_generic_open(tty, port);
 304 }
 305
 306 static int ir_prepare_write_buffer(struct usb_serial_port *port,
 307                                                 void *dest, size_t size)
 308 {
 309         unsigned char *buf = dest;
 310         int count;
 311
 312         /*
 313          * The first byte of the packet we send to the device contains an
 314          * inbound header which indicates an additional number of BOFs and
 315          * a baud rate change.
 316          *
 317          * See section 5.4.2.2 of the USB IrDA spec.
 318          */
 319         *buf = ir_xbof | ir_baud;
 320
 321         count = kfifo_out_locked(&port->write_fifo, buf + 1, size - 1,
 322                                                                 &port->lock);
 323         return count + 1;
 324 }
 325
 326 static void ir_process_read_urb(struct urb *urb)
 327 {
 328         struct usb_serial_port *port = urb->context;
 329         unsigned char *data = urb->transfer_buffer;
 330         struct tty_struct *tty;
 331
 332         if (!urb->actual_length)
 333                 return;
 334         /*
 335          * The first byte of the packet we get from the device
 336          * contains a busy indicator and baud rate change.
 337          * See section 5.4.1.2 of the USB IrDA spec.
 338          */
 339         if (*data & 0x0f)
 340                 ir_baud = *data & 0x0f;
 341
 342         if (urb->actual_length == 1)
 343                 return;
 344
 345         tty = tty_port_tty_get(&port->port);
 346         if (!tty)
 347                 return;
 348         tty_insert_flip_string(tty, data + 1, urb->actual_length - 1);
 349         tty_flip_buffer_push(tty);
 350         tty_kref_put(tty);
 351 }
 352
 353 static void ir_set_termios_callback(struct urb *urb)
 354 {
 355         struct usb_serial_port *port = urb->context;
 356         int status = urb->status;
 357
 358         dbg("%s - port %d", __func__, port->number);
 359
 360         kfree(urb->transfer_buffer);
 361
 362         if (status)
 363                 dbg("%s - non-zero urb status: %d", __func__, status);
 364 }
 365
 366 static void ir_set_termios(struct tty_struct *tty,
 367                 struct usb_serial_port *port, struct ktermios *old_termios)
 368 {
 369         struct urb *urb;
 370         unsigned char *transfer_buffer;
 371         int result;
 372         speed_t baud;
 373         int ir_baud;
 374
 375         dbg("%s - port %d", __func__, port->number);
 376
 377         baud = tty_get_baud_rate(tty);
 378
 379         /*
 380          * FIXME, we should compare the baud request against the
 381          * capability stated in the IR header that we got in the
 382          * startup function.
 383          */
 384
 385         switch (baud) {
 386         case 2400:
 387                 ir_baud = USB_IRDA_BR_2400;
 388                 break;
 389         case 9600:
 390                 ir_baud = USB_IRDA_BR_9600;
 391                 break;
 392         case 19200:
 393                 ir_baud = USB_IRDA_BR_19200;
 394                 break;
 395         case 38400:
 396                 ir_baud = USB_IRDA_BR_38400;
 397                 break;
 398         case 57600:
 399                 ir_baud = USB_IRDA_BR_57600;
 400                 break;
 401         case 115200:
 402                 ir_baud = USB_IRDA_BR_115200;
 403                 break;
 404         case 576000:
 405                 ir_baud = USB_IRDA_BR_576000;
 406                 break;
 407         case 1152000:
 408                 ir_baud = USB_IRDA_BR_1152000;
 409                 break;
 410         case 4000000:
 411                 ir_baud = USB_IRDA_BR_4000000;
 412                 break;
 413         default:
 414                 ir_baud = USB_IRDA_BR_9600;
 415                 baud = 9600;
 416         }
 417
 418         if (xbof == -1)
 419                 ir_xbof = ir_xbof_change(ir_add_bof);
 420         else
 421                 ir_xbof = ir_xbof_change(xbof) ;
 422
 423         /* Only speed changes are supported */
 424         tty_termios_copy_hw(tty->termios, old_termios);
 425         tty_encode_baud_rate(tty, baud, baud);
 426
 427         /*
 428          * send the baud change out on an "empty" data packet
 429          */
 430         urb = usb_alloc_urb(0, GFP_KERNEL);
 431         if (!urb) {
 432                 dev_err(&port->dev, "%s - no more urbs\n", __func__);
 433                 return;
 434         }
 435         transfer_buffer = kmalloc(1, GFP_KERNEL);
 436         if (!transfer_buffer) {
 437                 dev_err(&port->dev, "%s - out of memory\n", __func__);
 438                 goto err_buf;
 439         }
 440
 441         *transfer_buffer = ir_xbof | ir_baud;
 442
 443         usb_fill_bulk_urb(
 444                 urb,
 445                 port->serial->dev,
 446                 usb_sndbulkpipe(port->serial->dev,
 447                         port->bulk_out_endpointAddress),
 448                 transfer_buffer,
 449                 1,
 450                 ir_set_termios_callback,
 451                 port);
 452
 453         urb->transfer_flags = URB_ZERO_PACKET;
 454
 455         result = usb_submit_urb(urb, GFP_KERNEL);
 456         if (result) {
 457                 dev_err(&port->dev, "%s - failed to submit urb: %d\n",
 458                                                         __func__, result);
 459                 goto err_subm;
 460         }
 461
 462         usb_free_urb(urb);
 463
 464         return;
 465 err_subm:
 466         kfree(transfer_buffer);
 467 err_buf:
 468         usb_free_urb(urb);
 469 }
 470
 471 static int __init ir_init(void)
 472 {
 473         int retval;
 474
 475         if (buffer_size) {
 476                 ir_device.bulk_in_size = buffer_size;
 477                 ir_device.bulk_out_size = buffer_size;
 478         }
 479
 480         retval = usb_serial_register(&ir_device);
 481         if (retval)
 482                 goto failed_usb_serial_register;
 483
 484         retval = usb_register(&ir_driver);
 485         if (retval)
 486                 goto failed_usb_register;
 487
 488         printk(KERN_INFO KBUILD_MODNAME ": " DRIVER_VERSION ":"
 489                DRIVER_DESC "\n");
 490
 491         return 0;
 492
 493 failed_usb_register:
 494         usb_serial_deregister(&ir_device);
 495
 496 failed_usb_serial_register:
 497         return retval;
 498 }
 499
 500 static void __exit ir_exit(void)
 501 {
 502         usb_deregister(&ir_driver);
 503         usb_serial_deregister(&ir_device);
 504 }
 505
 506
 507 module_init(ir_init);
 508 module_exit(ir_exit);
 509
 510 MODULE_AUTHOR(DRIVER_AUTHOR);
 511 MODULE_DESCRIPTION(DRIVER_DESC);
 512 MODULE_LICENSE("GPL");
 513
 514 module_param(debug, bool, S_IRUGO | S_IWUSR);
 515 MODULE_PARM_DESC(debug, "Debug enabled or not");
 516 module_param(xbof, int, 0);
 517 MODULE_PARM_DESC(xbof, "Force specific number of XBOFs");
 518 module_param(buffer_size, int, 0);
 519 MODULE_PARM_DESC(buffer_size, "Size of the transfer buffers");
 520