drivers/staging/media/lirc/lirc_imon.c

   1 /*
   2  *   lirc_imon.c:  LIRC/VFD/LCD driver for SoundGraph iMON IR/VFD/LCD
   3  *                 including the iMON PAD model
   4  *
   5  *   Copyright(C) 2004  Venky Raju(dev@venky.ws)
   6  *   Copyright(C) 2009  Jarod Wilson <jarod@wilsonet.com>
   7  *
   8  *   lirc_imon 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 program is distributed in the hope that it will be useful,
  14  *   but WITHOUT ANY WARRANTY; without even the implied warranty of
  15  *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16  *   GNU General Public License for more details.
  17  *
  18  *   You should have received a copy of the GNU General Public License
  19  *   along with this program; if not, write to the Free Software
  20  *   Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  21  */
  22
  23 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
  24
  25 #include <linux/errno.h>
  26 #include <linux/kernel.h>
  27 #include <linux/module.h>
  28 #include <linux/slab.h>
  29 #include <linux/uaccess.h>
  30 #include <linux/usb.h>
  31
  32 #include <media/lirc.h>
  33 #include <media/lirc_dev.h>
  34
  35
  36 #define MOD_AUTHOR      "Venky Raju <dev@venky.ws>"
  37 #define MOD_DESC        "Driver for SoundGraph iMON MultiMedia IR/Display"
  38 #define MOD_NAME        "lirc_imon"
  39 #define MOD_VERSION     "0.8"
  40
  41 #define DISPLAY_MINOR_BASE      144
  42 #define DEVICE_NAME     "lcd%d"
  43
  44 #define BUF_CHUNK_SIZE  4
  45 #define BUF_SIZE        128
  46
  47 #define BIT_DURATION    250     /* each bit received is 250us */
  48
  49 /*** P R O T O T Y P E S ***/
  50
  51 /* USB Callback prototypes */
  52 static int imon_probe(struct usb_interface *interface,
  53                       const struct usb_device_id *id);
  54 static void imon_disconnect(struct usb_interface *interface);
  55 static void usb_rx_callback(struct urb *urb);
  56 static void usb_tx_callback(struct urb *urb);
  57
  58 /* suspend/resume support */
  59 static int imon_resume(struct usb_interface *intf);
  60 static int imon_suspend(struct usb_interface *intf, pm_message_t message);
  61
  62 /* Display file_operations function prototypes */
  63 static int display_open(struct inode *inode, struct file *file);
  64 static int display_close(struct inode *inode, struct file *file);
  65
  66 /* VFD write operation */
  67 static ssize_t vfd_write(struct file *file, const char __user *buf,
  68                          size_t n_bytes, loff_t *pos);
  69
  70 /* LIRC driver function prototypes */
  71 static int ir_open(void *data);
  72 static void ir_close(void *data);
  73
  74 /*** G L O B A L S ***/
  75 #define IMON_DATA_BUF_SZ        35
  76
  77 struct imon_context {
  78         struct usb_device *usbdev;
  79         /* Newer devices have two interfaces */
  80         int display;                    /* not all controllers do */
  81         int display_isopen;             /* display port has been opened */
  82         int ir_isopen;                  /* IR port open */
  83         int dev_present;                /* USB device presence */
  84         struct mutex ctx_lock;          /* to lock this object */
  85         wait_queue_head_t remove_ok;    /* For unexpected USB disconnects */
  86
  87         int vfd_proto_6p;               /* some VFD require a 6th packet */
  88
  89         struct lirc_driver *driver;
  90         struct usb_endpoint_descriptor *rx_endpoint;
  91         struct usb_endpoint_descriptor *tx_endpoint;
  92         struct urb *rx_urb;
  93         struct urb *tx_urb;
  94         unsigned char usb_rx_buf[8];
  95         unsigned char usb_tx_buf[8];
  96
  97         struct rx_data {
  98                 int count;              /* length of 0 or 1 sequence */
  99                 int prev_bit;           /* logic level of sequence */
 100                 int initial_space;      /* initial space flag */
 101         } rx;
 102
 103         struct tx_t {
 104                 unsigned char data_buf[IMON_DATA_BUF_SZ]; /* user data buffer */
 105                 struct completion finished;     /* wait for write to finish */
 106                 atomic_t busy;                  /* write in progress */
 107                 int status;                     /* status of tx completion */
 108         } tx;
 109 };
 110
 111 static const struct file_operations display_fops = {
 112         .owner          = THIS_MODULE,
 113         .open           = &display_open,
 114         .write          = &vfd_write,
 115         .release        = &display_close,
 116         .llseek         = noop_llseek,
 117 };
 118
 119 /*
 120  * USB Device ID for iMON USB Control Boards
 121  *
 122  * The Windows drivers contain 6 different inf files, more or less one for
 123  * each new device until the 0x0034-0x0046 devices, which all use the same
 124  * driver. Some of the devices in the 34-46 range haven't been definitively
 125  * identified yet. Early devices have either a TriGem Computer, Inc. or a
 126  * Samsung vendor ID (0x0aa8 and 0x04e8 respectively), while all later
 127  * devices use the SoundGraph vendor ID (0x15c2).
 128  */
 129 static struct usb_device_id imon_usb_id_table[] = {
 130         /* TriGem iMON (IR only) -- TG_iMON.inf */
 131         { USB_DEVICE(0x0aa8, 0x8001) },
 132
 133         /* SoundGraph iMON (IR only) -- sg_imon.inf */
 134         { USB_DEVICE(0x04e8, 0xff30) },
 135
 136         /* SoundGraph iMON VFD (IR & VFD) -- iMON_VFD.inf */
 137         { USB_DEVICE(0x0aa8, 0xffda) },
 138
 139         /* SoundGraph iMON SS (IR & VFD) -- iMON_SS.inf */
 140         { USB_DEVICE(0x15c2, 0xffda) },
 141
 142         {}
 143 };
 144
 145 /* Some iMON VFD models requires a 6th packet for VFD writes */
 146 static struct usb_device_id vfd_proto_6p_list[] = {
 147         { USB_DEVICE(0x15c2, 0xffda) },
 148         {}
 149 };
 150
 151 /* Some iMON devices have no lcd/vfd, don't set one up */
 152 static struct usb_device_id ir_only_list[] = {
 153         { USB_DEVICE(0x0aa8, 0x8001) },
 154         { USB_DEVICE(0x04e8, 0xff30) },
 155         {}
 156 };
 157
 158 /* USB Device data */
 159 static struct usb_driver imon_driver = {
 160         .name           = MOD_NAME,
 161         .probe          = imon_probe,
 162         .disconnect     = imon_disconnect,
 163         .suspend        = imon_suspend,
 164         .resume         = imon_resume,
 165         .id_table       = imon_usb_id_table,
 166 };
 167
 168 static struct usb_class_driver imon_class = {
 169         .name           = DEVICE_NAME,
 170         .fops           = &display_fops,
 171         .minor_base     = DISPLAY_MINOR_BASE,
 172 };
 173
 174 /* to prevent races between open() and disconnect(), probing, etc */
 175 static DEFINE_MUTEX(driver_lock);
 176
 177 static int debug;
 178
 179 /***  M O D U L E   C O D E ***/
 180
 181 MODULE_AUTHOR(MOD_AUTHOR);
 182 MODULE_DESCRIPTION(MOD_DESC);
 183 MODULE_VERSION(MOD_VERSION);
 184 MODULE_LICENSE("GPL");
 185 MODULE_DEVICE_TABLE(usb, imon_usb_id_table);
 186 module_param(debug, int, S_IRUGO | S_IWUSR);
 187 MODULE_PARM_DESC(debug, "Debug messages: 0=no, 1=yes(default: no)");
 188
 189 static void free_imon_context(struct imon_context *context)
 190 {
 191         struct device *dev = context->driver->dev;
 192
 193         usb_free_urb(context->tx_urb);
 194         usb_free_urb(context->rx_urb);
 195         lirc_buffer_free(context->driver->rbuf);
 196         kfree(context->driver->rbuf);
 197         kfree(context->driver);
 198         kfree(context);
 199
 200         dev_dbg(dev, "%s: iMON context freed\n", __func__);
 201 }
 202
 203 static void deregister_from_lirc(struct imon_context *context)
 204 {
 205         int retval;
 206         int minor = context->driver->minor;
 207
 208         retval = lirc_unregister_driver(minor);
 209         if (retval)
 210                 dev_err(&context->usbdev->dev,
 211                         "unable to deregister from lirc(%d)", retval);
 212         else
 213                 dev_info(&context->usbdev->dev,
 214                          "Deregistered iMON driver (minor:%d)\n", minor);
 215
 216 }
 217
 218 /**
 219  * Called when the Display device (e.g. /dev/lcd0)
 220  * is opened by the application.
 221  */
 222 static int display_open(struct inode *inode, struct file *file)
 223 {
 224         struct usb_interface *interface;
 225         struct imon_context *context = NULL;
 226         int subminor;
 227         int retval = 0;
 228
 229         /* prevent races with disconnect */
 230         mutex_lock(&driver_lock);
 231
 232         subminor = iminor(inode);
 233         interface = usb_find_interface(&imon_driver, subminor);
 234         if (!interface) {
 235                 pr_err("%s: could not find interface for minor %d\n",
 236                        __func__, subminor);
 237                 retval = -ENODEV;
 238                 goto exit;
 239         }
 240         context = usb_get_intfdata(interface);
 241
 242         if (!context) {
 243                 dev_err(&interface->dev, "no context found for minor %d\n",
 244                         subminor);
 245                 retval = -ENODEV;
 246                 goto exit;
 247         }
 248
 249         mutex_lock(&context->ctx_lock);
 250
 251         if (!context->display) {
 252                 dev_err(&interface->dev,
 253                         "%s: display not supported by device\n", __func__);
 254                 retval = -ENODEV;
 255         } else if (context->display_isopen) {
 256                 dev_err(&interface->dev,
 257                         "%s: display port is already open\n", __func__);
 258                 retval = -EBUSY;
 259         } else {
 260                 context->display_isopen = 1;
 261                 file->private_data = context;
 262                 dev_info(context->driver->dev, "display port opened\n");
 263         }
 264
 265         mutex_unlock(&context->ctx_lock);
 266
 267 exit:
 268         mutex_unlock(&driver_lock);
 269         return retval;
 270 }
 271
 272 /**
 273  * Called when the display device (e.g. /dev/lcd0)
 274  * is closed by the application.
 275  */
 276 static int display_close(struct inode *inode, struct file *file)
 277 {
 278         struct imon_context *context = NULL;
 279         int retval = 0;
 280
 281         context = file->private_data;
 282
 283         if (!context) {
 284                 pr_err("%s: no context for device\n", __func__);
 285                 return -ENODEV;
 286         }
 287
 288         mutex_lock(&context->ctx_lock);
 289
 290         if (!context->display) {
 291                 dev_err(&context->usbdev->dev,
 292                         "%s: display not supported by device\n", __func__);
 293                 retval = -ENODEV;
 294         } else if (!context->display_isopen) {
 295                 dev_err(&context->usbdev->dev,
 296                         "%s: display is not open\n", __func__);
 297                 retval = -EIO;
 298         } else {
 299                 context->display_isopen = 0;
 300                 dev_info(context->driver->dev, "display port closed\n");
 301                 if (!context->dev_present && !context->ir_isopen) {
 302                         /*
 303                          * Device disconnected before close and IR port is not
 304                          * open. If IR port is open, context will be deleted by
 305                          * ir_close.
 306                          */
 307                         mutex_unlock(&context->ctx_lock);
 308                         free_imon_context(context);
 309                         return retval;
 310                 }
 311         }
 312
 313         mutex_unlock(&context->ctx_lock);
 314         return retval;
 315 }
 316
 317 /**
 318  * Sends a packet to the device -- this function must be called
 319  * with context->ctx_lock held.
 320  */
 321 static int send_packet(struct imon_context *context)
 322 {
 323         unsigned int pipe;
 324         int interval = 0;
 325         int retval = 0;
 326
 327         /* Check if we need to use control or interrupt urb */
 328         pipe = usb_sndintpipe(context->usbdev,
 329                               context->tx_endpoint->bEndpointAddress);
 330         interval = context->tx_endpoint->bInterval;
 331
 332         usb_fill_int_urb(context->tx_urb, context->usbdev, pipe,
 333                          context->usb_tx_buf,
 334                          sizeof(context->usb_tx_buf),
 335                          usb_tx_callback, context, interval);
 336
 337         context->tx_urb->actual_length = 0;
 338
 339         init_completion(&context->tx.finished);
 340         atomic_set(&context->tx.busy, 1);
 341
 342         retval = usb_submit_urb(context->tx_urb, GFP_KERNEL);
 343         if (retval) {
 344                 atomic_set(&context->tx.busy, 0);
 345                 dev_err(&context->usbdev->dev, "error submitting urb(%d)\n",
 346                         retval);
 347         } else {
 348                 /* Wait for transmission to complete (or abort) */
 349                 mutex_unlock(&context->ctx_lock);
 350                 retval = wait_for_completion_interruptible(
 351                                 &context->tx.finished);
 352                 if (retval)
 353                         dev_err(&context->usbdev->dev,
 354                                 "%s: task interrupted\n", __func__);
 355                 mutex_lock(&context->ctx_lock);
 356
 357                 retval = context->tx.status;
 358                 if (retval)
 359                         dev_err(&context->usbdev->dev,
 360                                 "packet tx failed (%d)\n", retval);
 361         }
 362
 363         return retval;
 364 }
 365
 366 /**
 367  * Writes data to the VFD.  The iMON VFD is 2x16 characters
 368  * and requires data in 5 consecutive USB interrupt packets,
 369  * each packet but the last carrying 7 bytes.
 370  *
 371  * I don't know if the VFD board supports features such as
 372  * scrolling, clearing rows, blanking, etc. so at
 373  * the caller must provide a full screen of data.  If fewer
 374  * than 32 bytes are provided spaces will be appended to
 375  * generate a full screen.
 376  */
 377 static ssize_t vfd_write(struct file *file, const char __user *buf,
 378                          size_t n_bytes, loff_t *pos)
 379 {
 380         int i;
 381         int offset;
 382         int seq;
 383         int retval = 0;
 384         struct imon_context *context;
 385         const unsigned char vfd_packet6[] = {
 386                 0x01, 0x00, 0x00, 0x00, 0x00, 0xFF, 0xFF };
 387         int *data_buf = NULL;
 388
 389         context = file->private_data;
 390         if (!context) {
 391                 pr_err("%s: no context for device\n", __func__);
 392                 return -ENODEV;
 393         }
 394
 395         mutex_lock(&context->ctx_lock);
 396
 397         if (!context->dev_present) {
 398                 dev_err(&context->usbdev->dev,
 399                         "%s: no iMON device present\n", __func__);
 400                 retval = -ENODEV;
 401                 goto exit;
 402         }
 403
 404         if (n_bytes <= 0 || n_bytes > IMON_DATA_BUF_SZ - 3) {
 405                 dev_err(&context->usbdev->dev,
 406                         "%s: invalid payload size\n", __func__);
 407                 retval = -EINVAL;
 408                 goto exit;
 409         }
 410
 411         data_buf = memdup_user(buf, n_bytes);
 412         if (IS_ERR(data_buf)) {
 413                 retval = PTR_ERR(data_buf);
 414                 data_buf = NULL;
 415                 goto exit;
 416         }
 417
 418         memcpy(context->tx.data_buf, data_buf, n_bytes);
 419
 420         /* Pad with spaces */
 421         for (i = n_bytes; i < IMON_DATA_BUF_SZ - 3; ++i)
 422                 context->tx.data_buf[i] = ' ';
 423
 424         for (i = IMON_DATA_BUF_SZ - 3; i < IMON_DATA_BUF_SZ; ++i)
 425                 context->tx.data_buf[i] = 0xFF;
 426
 427         offset = 0;
 428         seq = 0;
 429
 430         do {
 431                 memcpy(context->usb_tx_buf, context->tx.data_buf + offset, 7);
 432                 context->usb_tx_buf[7] = (unsigned char) seq;
 433
 434                 retval = send_packet(context);
 435                 if (retval) {
 436                         dev_err(&context->usbdev->dev,
 437                                 "send packet failed for packet #%d\n",
 438                                 seq / 2);
 439                         goto exit;
 440                 } else {
 441                         seq += 2;
 442                         offset += 7;
 443                 }
 444
 445         } while (offset < IMON_DATA_BUF_SZ);
 446
 447         if (context->vfd_proto_6p) {
 448                 /* Send packet #6 */
 449                 memcpy(context->usb_tx_buf, &vfd_packet6, sizeof(vfd_packet6));
 450                 context->usb_tx_buf[7] = (unsigned char) seq;
 451                 retval = send_packet(context);
 452                 if (retval)
 453                         dev_err(&context->usbdev->dev,
 454                                 "send packet failed for packet #%d\n",
 455                                 seq / 2);
 456         }
 457
 458 exit:
 459         mutex_unlock(&context->ctx_lock);
 460         kfree(data_buf);
 461
 462         return (!retval) ? n_bytes : retval;
 463 }
 464
 465 /**
 466  * Callback function for USB core API: transmit data
 467  */
 468 static void usb_tx_callback(struct urb *urb)
 469 {
 470         struct imon_context *context;
 471
 472         if (!urb)
 473                 return;
 474         context = (struct imon_context *)urb->context;
 475         if (!context)
 476                 return;
 477
 478         context->tx.status = urb->status;
 479
 480         /* notify waiters that write has finished */
 481         atomic_set(&context->tx.busy, 0);
 482         complete(&context->tx.finished);
 483 }
 484
 485 /**
 486  * Called by lirc_dev when the application opens /dev/lirc
 487  */
 488 static int ir_open(void *data)
 489 {
 490         struct imon_context *context;
 491
 492         /* prevent races with disconnect */
 493         mutex_lock(&driver_lock);
 494
 495         context = data;
 496
 497         /* initial IR protocol decode variables */
 498         context->rx.count = 0;
 499         context->rx.initial_space = 1;
 500         context->rx.prev_bit = 0;
 501
 502         context->ir_isopen = 1;
 503         dev_info(context->driver->dev, "IR port opened\n");
 504
 505         mutex_unlock(&driver_lock);
 506         return 0;
 507 }
 508
 509 /**
 510  * Called by lirc_dev when the application closes /dev/lirc
 511  */
 512 static void ir_close(void *data)
 513 {
 514         struct imon_context *context;
 515
 516         context = data;
 517         if (!context) {
 518                 pr_err("%s: no context for device\n", __func__);
 519                 return;
 520         }
 521
 522         mutex_lock(&context->ctx_lock);
 523
 524         context->ir_isopen = 0;
 525         dev_info(context->driver->dev, "IR port closed\n");
 526
 527         if (!context->dev_present) {
 528                 /*
 529                  * Device disconnected while IR port was still open. Driver
 530                  * was not deregistered at disconnect time, so do it now.
 531                  */
 532                 deregister_from_lirc(context);
 533
 534                 if (!context->display_isopen) {
 535                         mutex_unlock(&context->ctx_lock);
 536                         free_imon_context(context);
 537                         return;
 538                 }
 539                 /*
 540                  * If display port is open, context will be deleted by
 541                  * display_close
 542                  */
 543         }
 544
 545         mutex_unlock(&context->ctx_lock);
 546 }
 547
 548 /**
 549  * Convert bit count to time duration (in us) and submit
 550  * the value to lirc_dev.
 551  */
 552 static void submit_data(struct imon_context *context)
 553 {
 554         unsigned char buf[4];
 555         int value = context->rx.count;
 556         int i;
 557
 558         dev_dbg(context->driver->dev, "submitting data to LIRC\n");
 559
 560         value *= BIT_DURATION;
 561         value &= PULSE_MASK;
 562         if (context->rx.prev_bit)
 563                 value |= PULSE_BIT;
 564
 565         for (i = 0; i < 4; ++i)
 566                 buf[i] = value>>(i*8);
 567
 568         lirc_buffer_write(context->driver->rbuf, buf);
 569         wake_up(&context->driver->rbuf->wait_poll);
 570 }
 571
 572 /**
 573  * Process the incoming packet
 574  */
 575 static void imon_incoming_packet(struct imon_context *context,
 576                                  struct urb *urb, int intf)
 577 {
 578         int len = urb->actual_length;
 579         unsigned char *buf = urb->transfer_buffer;
 580         struct device *dev = context->driver->dev;
 581         int octet, bit;
 582         unsigned char mask;
 583
 584         /*
 585          * just bail out if no listening IR client
 586          */
 587         if (!context->ir_isopen)
 588                 return;
 589
 590         if (len != 8) {
 591                 dev_warn(dev, "imon %s: invalid incoming packet size (len = %d, intf%d)\n",
 592                         __func__, len, intf);
 593                 return;
 594         }
 595
 596         if (debug)
 597                 dev_info(dev, "raw packet: %*ph\n", len, buf);
 598         /*
 599          * Translate received data to pulse and space lengths.
 600          * Received data is active low, i.e. pulses are 0 and
 601          * spaces are 1.
 602          *
 603          * My original algorithm was essentially similar to
 604          * Changwoo Ryu's with the exception that he switched
 605          * the incoming bits to active high and also fed an
 606          * initial space to LIRC at the start of a new sequence
 607          * if the previous bit was a pulse.
 608          *
 609          * I've decided to adopt his algorithm.
 610          */
 611
 612         if (buf[7] == 1 && context->rx.initial_space) {
 613                 /* LIRC requires a leading space */
 614                 context->rx.prev_bit = 0;
 615                 context->rx.count = 4;
 616                 submit_data(context);
 617                 context->rx.count = 0;
 618         }
 619
 620         for (octet = 0; octet < 5; ++octet) {
 621                 mask = 0x80;
 622                 for (bit = 0; bit < 8; ++bit) {
 623                         int curr_bit = !(buf[octet] & mask);
 624
 625                         if (curr_bit != context->rx.prev_bit) {
 626                                 if (context->rx.count) {
 627                                         submit_data(context);
 628                                         context->rx.count = 0;
 629                                 }
 630                                 context->rx.prev_bit = curr_bit;
 631                         }
 632                         ++context->rx.count;
 633                         mask >>= 1;
 634                 }
 635         }
 636
 637         if (buf[7] == 10) {
 638                 if (context->rx.count) {
 639                         submit_data(context);
 640                         context->rx.count = 0;
 641                 }
 642                 context->rx.initial_space = context->rx.prev_bit;
 643         }
 644 }
 645
 646 /**
 647  * Callback function for USB core API: receive data
 648  */
 649 static void usb_rx_callback(struct urb *urb)
 650 {
 651         struct imon_context *context;
 652         int intfnum = 0;
 653
 654         if (!urb)
 655                 return;
 656
 657         context = (struct imon_context *)urb->context;
 658         if (!context)
 659                 return;
 660
 661         switch (urb->status) {
 662         case -ENOENT:           /* usbcore unlink successful! */
 663                 return;
 664
 665         case 0:
 666                 imon_incoming_packet(context, urb, intfnum);
 667                 break;
 668
 669         default:
 670                 dev_warn(context->driver->dev, "imon %s: status(%d): ignored\n",
 671                          __func__, urb->status);
 672                 break;
 673         }
 674
 675         usb_submit_urb(context->rx_urb, GFP_ATOMIC);
 676 }
 677
 678 /**
 679  * Callback function for USB core API: Probe
 680  */
 681 static int imon_probe(struct usb_interface *interface,
 682                       const struct usb_device_id *id)
 683 {
 684         struct usb_device *usbdev = NULL;
 685         struct usb_host_interface *iface_desc = NULL;
 686         struct usb_endpoint_descriptor *rx_endpoint = NULL;
 687         struct usb_endpoint_descriptor *tx_endpoint = NULL;
 688         struct urb *rx_urb = NULL;
 689         struct urb *tx_urb = NULL;
 690         struct lirc_driver *driver = NULL;
 691         struct lirc_buffer *rbuf = NULL;
 692         struct device *dev = &interface->dev;
 693         int ifnum;
 694         int lirc_minor = 0;
 695         int num_endpts;
 696         int retval = -ENOMEM;
 697         int display_ep_found = 0;
 698         int ir_ep_found = 0;
 699         int vfd_proto_6p = 0;
 700         struct imon_context *context = NULL;
 701         int i;
 702         u16 vendor, product;
 703
 704         /* prevent races probing devices w/multiple interfaces */
 705         mutex_lock(&driver_lock);
 706
 707         context = kzalloc(sizeof(struct imon_context), GFP_KERNEL);
 708         if (!context)
 709                 goto driver_unlock;
 710
 711         /*
 712          * Try to auto-detect the type of display if the user hasn't set
 713          * it by hand via the display_type modparam. Default is VFD.
 714          */
 715         if (usb_match_id(interface, ir_only_list))
 716                 context->display = 0;
 717         else
 718                 context->display = 1;
 719
 720         usbdev     = usb_get_dev(interface_to_usbdev(interface));
 721         iface_desc = interface->cur_altsetting;
 722         num_endpts = iface_desc->desc.bNumEndpoints;
 723         ifnum      = iface_desc->desc.bInterfaceNumber;
 724         vendor     = le16_to_cpu(usbdev->descriptor.idVendor);
 725         product    = le16_to_cpu(usbdev->descriptor.idProduct);
 726
 727         dev_dbg(dev, "%s: found iMON device (%04x:%04x, intf%d)\n",
 728                 __func__, vendor, product, ifnum);
 729
 730         /*
 731          * Scan the endpoint list and set:
 732          *      first input endpoint = IR endpoint
 733          *      first output endpoint = display endpoint
 734          */
 735         for (i = 0; i < num_endpts && !(ir_ep_found && display_ep_found); ++i) {
 736                 struct usb_endpoint_descriptor *ep;
 737                 int ep_dir;
 738                 int ep_type;
 739
 740                 ep = &iface_desc->endpoint[i].desc;
 741                 ep_dir = ep->bEndpointAddress & USB_ENDPOINT_DIR_MASK;
 742                 ep_type = usb_endpoint_type(ep);
 743
 744                 if (!ir_ep_found &&
 745                         ep_dir == USB_DIR_IN &&
 746                         ep_type == USB_ENDPOINT_XFER_INT) {
 747
 748                         rx_endpoint = ep;
 749                         ir_ep_found = 1;
 750                         dev_dbg(dev, "%s: found IR endpoint\n", __func__);
 751
 752                 } else if (!display_ep_found && ep_dir == USB_DIR_OUT &&
 753                            ep_type == USB_ENDPOINT_XFER_INT) {
 754                         tx_endpoint = ep;
 755                         display_ep_found = 1;
 756                         dev_dbg(dev, "%s: found display endpoint\n", __func__);
 757                 }
 758         }
 759
 760         /*
 761          * Some iMON receivers have no display. Unfortunately, it seems
 762          * that SoundGraph recycles device IDs between devices both with
 763          * and without... :\
 764          */
 765         if (context->display == 0) {
 766                 display_ep_found = 0;
 767                 dev_dbg(dev, "%s: device has no display\n", __func__);
 768         }
 769
 770         /* Input endpoint is mandatory */
 771         if (!ir_ep_found) {
 772                 dev_err(dev, "%s: no valid input (IR) endpoint found.\n",
 773                         __func__);
 774                 retval = -ENODEV;
 775                 goto free_context;
 776         }
 777
 778         /* Determine if display requires 6 packets */
 779         if (display_ep_found) {
 780                 if (usb_match_id(interface, vfd_proto_6p_list))
 781                         vfd_proto_6p = 1;
 782
 783                 dev_dbg(dev, "%s: vfd_proto_6p: %d\n",
 784                         __func__, vfd_proto_6p);
 785         }
 786
 787         driver = kzalloc(sizeof(struct lirc_driver), GFP_KERNEL);
 788         if (!driver)
 789                 goto free_context;
 790
 791         rbuf = kmalloc(sizeof(struct lirc_buffer), GFP_KERNEL);
 792         if (!rbuf)
 793                 goto free_driver;
 794
 795         if (lirc_buffer_init(rbuf, BUF_CHUNK_SIZE, BUF_SIZE)) {
 796                 dev_err(dev, "%s: lirc_buffer_init failed\n", __func__);
 797                 goto free_rbuf;
 798         }
 799         rx_urb = usb_alloc_urb(0, GFP_KERNEL);
 800         if (!rx_urb) {
 801                 dev_err(dev, "%s: usb_alloc_urb failed for IR urb\n", __func__);
 802                 goto free_lirc_buf;
 803         }
 804         tx_urb = usb_alloc_urb(0, GFP_KERNEL);
 805         if (!tx_urb) {
 806                 dev_err(dev, "%s: usb_alloc_urb failed for display urb\n",
 807                     __func__);
 808                 goto free_rx_urb;
 809         }
 810
 811         mutex_init(&context->ctx_lock);
 812         context->vfd_proto_6p = vfd_proto_6p;
 813
 814         strcpy(driver->name, MOD_NAME);
 815         driver->minor = -1;
 816         driver->code_length = BUF_CHUNK_SIZE * 8;
 817         driver->sample_rate = 0;
 818         driver->features = LIRC_CAN_REC_MODE2;
 819         driver->data = context;
 820         driver->rbuf = rbuf;
 821         driver->set_use_inc = ir_open;
 822         driver->set_use_dec = ir_close;
 823         driver->dev = &interface->dev;
 824         driver->owner = THIS_MODULE;
 825
 826         mutex_lock(&context->ctx_lock);
 827
 828         context->driver = driver;
 829         /* start out in keyboard mode */
 830
 831         lirc_minor = lirc_register_driver(driver);
 832         if (lirc_minor < 0) {
 833                 dev_err(dev, "%s: lirc_register_driver failed\n", __func__);
 834                 goto free_tx_urb;
 835         }
 836
 837         dev_info(dev, "Registered iMON driver (lirc minor: %d)\n",
 838                         lirc_minor);
 839
 840         /* Needed while unregistering! */
 841         driver->minor = lirc_minor;
 842
 843         context->usbdev = usbdev;
 844         context->dev_present = 1;
 845         context->rx_endpoint = rx_endpoint;
 846         context->rx_urb = rx_urb;
 847
 848         /*
 849          * tx is used to send characters to lcd/vfd, associate RF
 850          * remotes, set IR protocol, and maybe more...
 851          */
 852         context->tx_endpoint = tx_endpoint;
 853         context->tx_urb = tx_urb;
 854
 855         if (display_ep_found)
 856                 context->display = 1;
 857
 858         usb_fill_int_urb(context->rx_urb, context->usbdev,
 859                 usb_rcvintpipe(context->usbdev,
 860                         context->rx_endpoint->bEndpointAddress),
 861                 context->usb_rx_buf, sizeof(context->usb_rx_buf),
 862                 usb_rx_callback, context,
 863                 context->rx_endpoint->bInterval);
 864
 865         retval = usb_submit_urb(context->rx_urb, GFP_KERNEL);
 866         if (retval) {
 867                 dev_err(dev, "usb_submit_urb failed for intf0 (%d)\n", retval);
 868                 goto unregister_lirc;
 869         }
 870
 871         usb_set_intfdata(interface, context);
 872
 873         if (context->display && ifnum == 0) {
 874                 dev_dbg(dev, "%s: Registering iMON display with sysfs\n",
 875                         __func__);
 876
 877                 if (usb_register_dev(interface, &imon_class)) {
 878                         /* Not a fatal error, so ignore */
 879                         dev_info(dev, "%s: could not get a minor number for display\n",
 880                                  __func__);
 881                 }
 882         }
 883
 884         dev_info(dev, "iMON device (%04x:%04x, intf%d) on usb<%d:%d> initialized\n",
 885                 vendor, product, ifnum, usbdev->bus->busnum, usbdev->devnum);
 886
 887         /* Everything went fine. Just unlock and return retval (with is 0) */
 888         mutex_unlock(&context->ctx_lock);
 889         goto driver_unlock;
 890
 891 unregister_lirc:
 892         lirc_unregister_driver(driver->minor);
 893
 894 free_tx_urb:
 895         mutex_unlock(&context->ctx_lock);
 896         usb_free_urb(tx_urb);
 897
 898 free_rx_urb:
 899         usb_free_urb(rx_urb);
 900
 901 free_lirc_buf:
 902         lirc_buffer_free(rbuf);
 903
 904 free_rbuf:
 905         kfree(rbuf);
 906
 907 free_driver:
 908         kfree(driver);
 909 free_context:
 910         kfree(context);
 911         context = NULL;
 912
 913 driver_unlock:
 914         mutex_unlock(&driver_lock);
 915
 916         return retval;
 917 }
 918
 919 /**
 920  * Callback function for USB core API: disconnect
 921  */
 922 static void imon_disconnect(struct usb_interface *interface)
 923 {
 924         struct imon_context *context;
 925         int ifnum;
 926
 927         /* prevent races with ir_open()/display_open() */
 928         mutex_lock(&driver_lock);
 929
 930         context = usb_get_intfdata(interface);
 931         ifnum = interface->cur_altsetting->desc.bInterfaceNumber;
 932
 933         mutex_lock(&context->ctx_lock);
 934
 935         usb_set_intfdata(interface, NULL);
 936
 937         /* Abort ongoing write */
 938         if (atomic_read(&context->tx.busy)) {
 939                 usb_kill_urb(context->tx_urb);
 940                 complete_all(&context->tx.finished);
 941         }
 942
 943         context->dev_present = 0;
 944         usb_kill_urb(context->rx_urb);
 945         if (context->display)
 946                 usb_deregister_dev(interface, &imon_class);
 947
 948         if (!context->ir_isopen && !context->dev_present) {
 949                 deregister_from_lirc(context);
 950                 mutex_unlock(&context->ctx_lock);
 951                 if (!context->display_isopen)
 952                         free_imon_context(context);
 953         } else
 954                 mutex_unlock(&context->ctx_lock);
 955
 956         mutex_unlock(&driver_lock);
 957
 958         dev_info(&interface->dev, "%s: iMON device (intf%d) disconnected\n",
 959                  __func__, ifnum);
 960 }
 961
 962 static int imon_suspend(struct usb_interface *intf, pm_message_t message)
 963 {
 964         struct imon_context *context = usb_get_intfdata(intf);
 965
 966         usb_kill_urb(context->rx_urb);
 967
 968         return 0;
 969 }
 970
 971 static int imon_resume(struct usb_interface *intf)
 972 {
 973         struct imon_context *context = usb_get_intfdata(intf);
 974
 975         usb_fill_int_urb(context->rx_urb, context->usbdev,
 976                 usb_rcvintpipe(context->usbdev,
 977                         context->rx_endpoint->bEndpointAddress),
 978                 context->usb_rx_buf, sizeof(context->usb_rx_buf),
 979                 usb_rx_callback, context,
 980                 context->rx_endpoint->bInterval);
 981
 982         return usb_submit_urb(context->rx_urb, GFP_ATOMIC);
 983 }
 984
 985 module_usb_driver(imon_driver);