drivers/media/IR/streamzap.c

   1 /*
   2  * Streamzap Remote Control driver
   3  *
   4  * Copyright (c) 2005 Christoph Bartelmus <lirc@bartelmus.de>
   5  * Copyright (c) 2010 Jarod Wilson <jarod@wilsonet.com>
   6  *
   7  * This driver was based on the work of Greg Wickham and Adrian
   8  * Dewhurst. It was substantially rewritten to support correct signal
   9  * gaps and now maintains a delay buffer, which is used to present
  10  * consistent timing behaviour to user space applications. Without the
  11  * delay buffer an ugly hack would be required in lircd, which can
  12  * cause sluggish signal decoding in certain situations.
  13  *
  14  * Ported to in-kernel ir-core interface by Jarod Wilson
  15  *
  16  * This driver is based on the USB skeleton driver packaged with the
  17  * kernel; copyright (C) 2001-2003 Greg Kroah-Hartman (greg@kroah.com)
  18  *
  19  *  This program is free software; you can redistribute it and/or modify
  20  *  it under the terms of the GNU General Public License as published by
  21  *  the Free Software Foundation; either version 2 of the License, or
  22  *  (at your option) any later version.
  23  *
  24  *  This program is distributed in the hope that it will be useful,
  25  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  26  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  27  *  GNU General Public License for more details.
  28  *
  29  *  You should have received a copy of the GNU General Public License
  30  *  along with this program; if not, write to the Free Software
  31  *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  32  */
  33
  34 #include <linux/device.h>
  35 #include <linux/module.h>
  36 #include <linux/slab.h>
  37 #include <linux/usb.h>
  38 #include <linux/input.h>
  39 #include <media/ir-core.h>
  40
  41 #define DRIVER_VERSION  "1.60"
  42 #define DRIVER_NAME     "streamzap"
  43 #define DRIVER_DESC     "Streamzap Remote Control driver"
  44
  45 #ifdef CONFIG_USB_DEBUG
  46 static int debug = 1;
  47 #else
  48 static int debug;
  49 #endif
  50
  51 #define USB_STREAMZAP_VENDOR_ID         0x0e9c
  52 #define USB_STREAMZAP_PRODUCT_ID        0x0000
  53
  54 /* table of devices that work with this driver */
  55 static struct usb_device_id streamzap_table[] = {
  56         /* Streamzap Remote Control */
  57         { USB_DEVICE(USB_STREAMZAP_VENDOR_ID, USB_STREAMZAP_PRODUCT_ID) },
  58         /* Terminating entry */
  59         { }
  60 };
  61
  62 MODULE_DEVICE_TABLE(usb, streamzap_table);
  63
  64 #define STREAMZAP_PULSE_MASK 0xf0
  65 #define STREAMZAP_SPACE_MASK 0x0f
  66 #define STREAMZAP_TIMEOUT    0xff
  67 #define STREAMZAP_RESOLUTION 256
  68
  69 /* number of samples buffered */
  70 #define SZ_BUF_LEN 128
  71
  72 enum StreamzapDecoderState {
  73         PulseSpace,
  74         FullPulse,
  75         FullSpace,
  76         IgnorePulse
  77 };
  78
  79 /* structure to hold our device specific stuff */
  80 struct streamzap_ir {
  81
  82         /* ir-core */
  83         struct ir_dev_props *props;
  84         struct ir_raw_event rawir;
  85
  86         /* core device info */
  87         struct device *dev;
  88         struct input_dev *idev;
  89
  90         /* usb */
  91         struct usb_device       *usbdev;
  92         struct usb_interface    *interface;
  93         struct usb_endpoint_descriptor *endpoint;
  94         struct urb              *urb_in;
  95
  96         /* buffer & dma */
  97         unsigned char           *buf_in;
  98         dma_addr_t              dma_in;
  99         unsigned int            buf_in_len;
 100
 101         /* timer used to support delay buffering */
 102         struct timer_list       delay_timer;
 103         bool                    timer_running;
 104         spinlock_t              timer_lock;
 105         struct timer_list       flush_timer;
 106         bool                    flush;
 107
 108         /* delay buffer */
 109         struct kfifo fifo;
 110         bool fifo_initialized;
 111
 112         /* track what state we're in */
 113         enum StreamzapDecoderState decoder_state;
 114         /* tracks whether we are currently receiving some signal */
 115         bool                    idle;
 116         /* sum of signal lengths received since signal start */
 117         unsigned long           sum;
 118         /* start time of signal; necessary for gap tracking */
 119         struct timeval          signal_last;
 120         struct timeval          signal_start;
 121         /* bool                 timeout_enabled; */
 122
 123         char                    name[128];
 124         char                    phys[64];
 125 };
 126
 127
 128 /* local function prototypes */
 129 static int streamzap_probe(struct usb_interface *interface,
 130                            const struct usb_device_id *id);
 131 static void streamzap_disconnect(struct usb_interface *interface);
 132 static void streamzap_callback(struct urb *urb);
 133 static int streamzap_suspend(struct usb_interface *intf, pm_message_t message);
 134 static int streamzap_resume(struct usb_interface *intf);
 135
 136 /* usb specific object needed to register this driver with the usb subsystem */
 137 static struct usb_driver streamzap_driver = {
 138         .name =         DRIVER_NAME,
 139         .probe =        streamzap_probe,
 140         .disconnect =   streamzap_disconnect,
 141         .suspend =      streamzap_suspend,
 142         .resume =       streamzap_resume,
 143         .id_table =     streamzap_table,
 144 };
 145
 146 static void streamzap_stop_timer(struct streamzap_ir *sz)
 147 {
 148         unsigned long flags;
 149
 150         spin_lock_irqsave(&sz->timer_lock, flags);
 151         if (sz->timer_running) {
 152                 sz->timer_running = false;
 153                 spin_unlock_irqrestore(&sz->timer_lock, flags);
 154                 del_timer_sync(&sz->delay_timer);
 155         } else {
 156                 spin_unlock_irqrestore(&sz->timer_lock, flags);
 157         }
 158 }
 159
 160 static void streamzap_flush_timeout(unsigned long arg)
 161 {
 162         struct streamzap_ir *sz = (struct streamzap_ir *)arg;
 163
 164         dev_info(sz->dev, "%s: callback firing\n", __func__);
 165
 166         /* finally start accepting data */
 167         sz->flush = false;
 168 }
 169
 170 static void streamzap_delay_timeout(unsigned long arg)
 171 {
 172         struct streamzap_ir *sz = (struct streamzap_ir *)arg;
 173         struct ir_raw_event rawir = { .pulse = false, .duration = 0 };
 174         unsigned long flags;
 175         int len, ret;
 176         static unsigned long delay;
 177         bool wake = false;
 178
 179         /* deliver data every 10 ms */
 180         delay = msecs_to_jiffies(10);
 181
 182         spin_lock_irqsave(&sz->timer_lock, flags);
 183
 184         if (kfifo_len(&sz->fifo) > 0) {
 185                 ret = kfifo_out(&sz->fifo, &rawir, sizeof(rawir));
 186                 if (ret != sizeof(rawir))
 187                         dev_err(sz->dev, "Problem w/kfifo_out...\n");
 188                 ir_raw_event_store(sz->idev, &rawir);
 189                 wake = true;
 190         }
 191
 192         len = kfifo_len(&sz->fifo);
 193         if (len > 0) {
 194                 while ((len < SZ_BUF_LEN / 2) &&
 195                        (len < SZ_BUF_LEN * sizeof(int))) {
 196                         ret = kfifo_out(&sz->fifo, &rawir, sizeof(rawir));
 197                         if (ret != sizeof(rawir))
 198                                 dev_err(sz->dev, "Problem w/kfifo_out...\n");
 199                         ir_raw_event_store(sz->idev, &rawir);
 200                         wake = true;
 201                         len = kfifo_len(&sz->fifo);
 202                 }
 203                 if (sz->timer_running)
 204                         mod_timer(&sz->delay_timer, jiffies + delay);
 205
 206         } else {
 207                 sz->timer_running = false;
 208         }
 209
 210         if (wake)
 211                 ir_raw_event_handle(sz->idev);
 212
 213         spin_unlock_irqrestore(&sz->timer_lock, flags);
 214 }
 215
 216 static void streamzap_flush_delay_buffer(struct streamzap_ir *sz)
 217 {
 218         struct ir_raw_event rawir = { .pulse = false, .duration = 0 };
 219         bool wake = false;
 220         int ret;
 221
 222         while (kfifo_len(&sz->fifo) > 0) {
 223                 ret = kfifo_out(&sz->fifo, &rawir, sizeof(rawir));
 224                 if (ret != sizeof(rawir))
 225                         dev_err(sz->dev, "Problem w/kfifo_out...\n");
 226                 ir_raw_event_store(sz->idev, &rawir);
 227                 wake = true;
 228         }
 229
 230         if (wake)
 231                 ir_raw_event_handle(sz->idev);
 232 }
 233
 234 static void sz_push(struct streamzap_ir *sz)
 235 {
 236         struct ir_raw_event rawir = { .pulse = false, .duration = 0 };
 237         unsigned long flags;
 238         int ret;
 239
 240         spin_lock_irqsave(&sz->timer_lock, flags);
 241         if (kfifo_len(&sz->fifo) >= sizeof(int) * SZ_BUF_LEN) {
 242                 ret = kfifo_out(&sz->fifo, &rawir, sizeof(rawir));
 243                 if (ret != sizeof(rawir))
 244                         dev_err(sz->dev, "Problem w/kfifo_out...\n");
 245                 ir_raw_event_store(sz->idev, &rawir);
 246         }
 247
 248         kfifo_in(&sz->fifo, &sz->rawir, sizeof(rawir));
 249
 250         if (!sz->timer_running) {
 251                 sz->delay_timer.expires = jiffies + (HZ / 10);
 252                 add_timer(&sz->delay_timer);
 253                 sz->timer_running = true;
 254         }
 255
 256         spin_unlock_irqrestore(&sz->timer_lock, flags);
 257 }
 258
 259 static void sz_push_full_pulse(struct streamzap_ir *sz,
 260                                unsigned char value)
 261 {
 262         if (sz->idle) {
 263                 long deltv;
 264
 265                 sz->signal_last = sz->signal_start;
 266                 do_gettimeofday(&sz->signal_start);
 267
 268                 deltv = sz->signal_start.tv_sec - sz->signal_last.tv_sec;
 269                 sz->rawir.pulse = false;
 270                 if (deltv > 15) {
 271                         /* really long time */
 272                         sz->rawir.duration = IR_MAX_DURATION;
 273                 } else {
 274                         sz->rawir.duration = (int)(deltv * 1000000 +
 275                                 sz->signal_start.tv_usec -
 276                                 sz->signal_last.tv_usec);
 277                         sz->rawir.duration -= sz->sum;
 278                         sz->rawir.duration *= 1000;
 279                         sz->rawir.duration &= IR_MAX_DURATION;
 280                 }
 281                 dev_dbg(sz->dev, "ls %u\n", sz->rawir.duration);
 282                 sz_push(sz);
 283
 284                 sz->idle = 0;
 285                 sz->sum = 0;
 286         }
 287
 288         sz->rawir.pulse = true;
 289         sz->rawir.duration = ((int) value) * STREAMZAP_RESOLUTION;
 290         sz->rawir.duration += STREAMZAP_RESOLUTION / 2;
 291         sz->sum += sz->rawir.duration;
 292         sz->rawir.duration *= 1000;
 293         sz->rawir.duration &= IR_MAX_DURATION;
 294         dev_dbg(sz->dev, "p %u\n", sz->rawir.duration);
 295         sz_push(sz);
 296 }
 297
 298 static void sz_push_half_pulse(struct streamzap_ir *sz,
 299                                unsigned char value)
 300 {
 301         sz_push_full_pulse(sz, (value & STREAMZAP_PULSE_MASK) >> 4);
 302 }
 303
 304 static void sz_push_full_space(struct streamzap_ir *sz,
 305                                unsigned char value)
 306 {
 307         sz->rawir.pulse = false;
 308         sz->rawir.duration = ((int) value) * STREAMZAP_RESOLUTION;
 309         sz->rawir.duration += STREAMZAP_RESOLUTION / 2;
 310         sz->sum += sz->rawir.duration;
 311         sz->rawir.duration *= 1000;
 312         dev_dbg(sz->dev, "s %u\n", sz->rawir.duration);
 313         sz_push(sz);
 314 }
 315
 316 static void sz_push_half_space(struct streamzap_ir *sz,
 317                                unsigned long value)
 318 {
 319         sz_push_full_space(sz, value & STREAMZAP_SPACE_MASK);
 320 }
 321
 322 /**
 323  * streamzap_callback - usb IRQ handler callback
 324  *
 325  * This procedure is invoked on reception of data from
 326  * the usb remote.
 327  */
 328 static void streamzap_callback(struct urb *urb)
 329 {
 330         struct streamzap_ir *sz;
 331         unsigned int i;
 332         int len;
 333         #if 0
 334         static int timeout = (((STREAMZAP_TIMEOUT * STREAMZAP_RESOLUTION) &
 335                                 IR_MAX_DURATION) | 0x03000000);
 336         #endif
 337
 338         if (!urb)
 339                 return;
 340
 341         sz = urb->context;
 342         len = urb->actual_length;
 343
 344         switch (urb->status) {
 345         case -ECONNRESET:
 346         case -ENOENT:
 347         case -ESHUTDOWN:
 348                 /*
 349                  * this urb is terminated, clean up.
 350                  * sz might already be invalid at this point
 351                  */
 352                 dev_err(sz->dev, "urb terminated, status: %d\n", urb->status);
 353                 return;
 354         default:
 355                 break;
 356         }
 357
 358         dev_dbg(sz->dev, "%s: received urb, len %d\n", __func__, len);
 359         if (!sz->flush) {
 360                 for (i = 0; i < urb->actual_length; i++) {
 361                         dev_dbg(sz->dev, "%d: %x\n", i,
 362                                 (unsigned char)sz->buf_in[i]);
 363                         switch (sz->decoder_state) {
 364                         case PulseSpace:
 365                                 if ((sz->buf_in[i] & STREAMZAP_PULSE_MASK) ==
 366                                     STREAMZAP_PULSE_MASK) {
 367                                         sz->decoder_state = FullPulse;
 368                                         continue;
 369                                 } else if ((sz->buf_in[i] & STREAMZAP_SPACE_MASK)
 370                                            == STREAMZAP_SPACE_MASK) {
 371                                         sz_push_half_pulse(sz, sz->buf_in[i]);
 372                                         sz->decoder_state = FullSpace;
 373                                         continue;
 374                                 } else {
 375                                         sz_push_half_pulse(sz, sz->buf_in[i]);
 376                                         sz_push_half_space(sz, sz->buf_in[i]);
 377                                 }
 378                                 break;
 379                         case FullPulse:
 380                                 sz_push_full_pulse(sz, sz->buf_in[i]);
 381                                 sz->decoder_state = IgnorePulse;
 382                                 break;
 383                         case FullSpace:
 384                                 if (sz->buf_in[i] == STREAMZAP_TIMEOUT) {
 385                                         sz->idle = 1;
 386                                         streamzap_stop_timer(sz);
 387                                         #if 0
 388                                         if (sz->timeout_enabled) {
 389                                                 sz->rawir.pulse = false;
 390                                                 sz->rawir.duration = timeout;
 391                                                 sz->rawir.duration *= 1000;
 392                                                 sz_push(sz);
 393                                         }
 394                                         #endif
 395                                         streamzap_flush_delay_buffer(sz);
 396                                 } else
 397                                         sz_push_full_space(sz, sz->buf_in[i]);
 398                                 sz->decoder_state = PulseSpace;
 399                                 break;
 400                         case IgnorePulse:
 401                                 if ((sz->buf_in[i]&STREAMZAP_SPACE_MASK) ==
 402                                     STREAMZAP_SPACE_MASK) {
 403                                         sz->decoder_state = FullSpace;
 404                                         continue;
 405                                 }
 406                                 sz_push_half_space(sz, sz->buf_in[i]);
 407                                 sz->decoder_state = PulseSpace;
 408                                 break;
 409                         }
 410                 }
 411         }
 412
 413         usb_submit_urb(urb, GFP_ATOMIC);
 414
 415         return;
 416 }
 417
 418 static struct input_dev *streamzap_init_input_dev(struct streamzap_ir *sz)
 419 {
 420         struct input_dev *idev;
 421         struct ir_dev_props *props;
 422         struct device *dev = sz->dev;
 423         int ret;
 424
 425         idev = input_allocate_device();
 426         if (!idev) {
 427                 dev_err(dev, "remote input dev allocation failed\n");
 428                 goto idev_alloc_failed;
 429         }
 430
 431         props = kzalloc(sizeof(struct ir_dev_props), GFP_KERNEL);
 432         if (!props) {
 433                 dev_err(dev, "remote ir dev props allocation failed\n");
 434                 goto props_alloc_failed;
 435         }
 436
 437         snprintf(sz->name, sizeof(sz->name), "Streamzap PC Remote Infrared "
 438                  "Receiver (%04x:%04x)",
 439                  le16_to_cpu(sz->usbdev->descriptor.idVendor),
 440                  le16_to_cpu(sz->usbdev->descriptor.idProduct));
 441
 442         idev->name = sz->name;
 443         usb_make_path(sz->usbdev, sz->phys, sizeof(sz->phys));
 444         strlcat(sz->phys, "/input0", sizeof(sz->phys));
 445         idev->phys = sz->phys;
 446
 447         props->priv = sz;
 448         props->driver_type = RC_DRIVER_IR_RAW;
 449         /* FIXME: not sure about supported protocols, check on this */
 450         props->allowed_protos = IR_TYPE_RC5 | IR_TYPE_RC6;
 451
 452         sz->props = props;
 453
 454         ret = ir_input_register(idev, RC_MAP_RC5_STREAMZAP, props, DRIVER_NAME);
 455         if (ret < 0) {
 456                 dev_err(dev, "remote input device register failed\n");
 457                 goto irdev_failed;
 458         }
 459
 460         return idev;
 461
 462 irdev_failed:
 463         kfree(props);
 464 props_alloc_failed:
 465         input_free_device(idev);
 466 idev_alloc_failed:
 467         return NULL;
 468 }
 469
 470 static int streamzap_delay_buf_init(struct streamzap_ir *sz)
 471 {
 472         int ret;
 473
 474         ret = kfifo_alloc(&sz->fifo, sizeof(int) * SZ_BUF_LEN,
 475                           GFP_KERNEL);
 476         if (ret == 0)
 477                 sz->fifo_initialized = 1;
 478
 479         return ret;
 480 }
 481
 482 static void streamzap_start_flush_timer(struct streamzap_ir *sz)
 483 {
 484         sz->flush_timer.expires = jiffies + HZ;
 485         sz->flush = true;
 486         add_timer(&sz->flush_timer);
 487
 488         sz->urb_in->dev = sz->usbdev;
 489         if (usb_submit_urb(sz->urb_in, GFP_ATOMIC))
 490                 dev_err(sz->dev, "urb submit failed\n");
 491 }
 492
 493 /**
 494  *      streamzap_probe
 495  *
 496  *      Called by usb-core to associated with a candidate device
 497  *      On any failure the return value is the ERROR
 498  *      On success return 0
 499  */
 500 static int __devinit streamzap_probe(struct usb_interface *intf,
 501                                      const struct usb_device_id *id)
 502 {
 503         struct usb_device *usbdev = interface_to_usbdev(intf);
 504         struct usb_host_interface *iface_host;
 505         struct streamzap_ir *sz = NULL;
 506         char buf[63], name[128] = "";
 507         int retval = -ENOMEM;
 508         int pipe, maxp;
 509
 510         /* Allocate space for device driver specific data */
 511         sz = kzalloc(sizeof(struct streamzap_ir), GFP_KERNEL);
 512         if (!sz)
 513                 return -ENOMEM;
 514
 515         sz->usbdev = usbdev;
 516         sz->interface = intf;
 517
 518         /* Check to ensure endpoint information matches requirements */
 519         iface_host = intf->cur_altsetting;
 520
 521         if (iface_host->desc.bNumEndpoints != 1) {
 522                 dev_err(&intf->dev, "%s: Unexpected desc.bNumEndpoints (%d)\n",
 523                         __func__, iface_host->desc.bNumEndpoints);
 524                 retval = -ENODEV;
 525                 goto free_sz;
 526         }
 527
 528         sz->endpoint = &(iface_host->endpoint[0].desc);
 529         if ((sz->endpoint->bEndpointAddress & USB_ENDPOINT_DIR_MASK)
 530             != USB_DIR_IN) {
 531                 dev_err(&intf->dev, "%s: endpoint doesn't match input device "
 532                         "02%02x\n", __func__, sz->endpoint->bEndpointAddress);
 533                 retval = -ENODEV;
 534                 goto free_sz;
 535         }
 536
 537         if ((sz->endpoint->bmAttributes & USB_ENDPOINT_XFERTYPE_MASK)
 538             != USB_ENDPOINT_XFER_INT) {
 539                 dev_err(&intf->dev, "%s: endpoint attributes don't match xfer "
 540                         "02%02x\n", __func__, sz->endpoint->bmAttributes);
 541                 retval = -ENODEV;
 542                 goto free_sz;
 543         }
 544
 545         pipe = usb_rcvintpipe(usbdev, sz->endpoint->bEndpointAddress);
 546         maxp = usb_maxpacket(usbdev, pipe, usb_pipeout(pipe));
 547
 548         if (maxp == 0) {
 549                 dev_err(&intf->dev, "%s: endpoint Max Packet Size is 0!?!\n",
 550                         __func__);
 551                 retval = -ENODEV;
 552                 goto free_sz;
 553         }
 554
 555         /* Allocate the USB buffer and IRQ URB */
 556         sz->buf_in = usb_alloc_coherent(usbdev, maxp, GFP_ATOMIC, &sz->dma_in);
 557         if (!sz->buf_in)
 558                 goto free_sz;
 559
 560         sz->urb_in = usb_alloc_urb(0, GFP_KERNEL);
 561         if (!sz->urb_in)
 562                 goto free_buf_in;
 563
 564         sz->dev = &intf->dev;
 565         sz->buf_in_len = maxp;
 566
 567         if (usbdev->descriptor.iManufacturer
 568             && usb_string(usbdev, usbdev->descriptor.iManufacturer,
 569                           buf, sizeof(buf)) > 0)
 570                 strlcpy(name, buf, sizeof(name));
 571
 572         if (usbdev->descriptor.iProduct
 573             && usb_string(usbdev, usbdev->descriptor.iProduct,
 574                           buf, sizeof(buf)) > 0)
 575                 snprintf(name + strlen(name), sizeof(name) - strlen(name),
 576                          " %s", buf);
 577
 578         retval = streamzap_delay_buf_init(sz);
 579         if (retval) {
 580                 dev_err(&intf->dev, "%s: delay buffer init failed\n", __func__);
 581                 goto free_urb_in;
 582         }
 583
 584         sz->idev = streamzap_init_input_dev(sz);
 585         if (!sz->idev)
 586                 goto input_dev_fail;
 587
 588         sz->idle = true;
 589         sz->decoder_state = PulseSpace;
 590         #if 0
 591         /* not yet supported, depends on patches from maxim */
 592         /* see also: LIRC_GET_REC_RESOLUTION and LIRC_SET_REC_TIMEOUT */
 593         sz->timeout_enabled = false;
 594         sz->min_timeout = STREAMZAP_TIMEOUT * STREAMZAP_RESOLUTION * 1000;
 595         sz->max_timeout = STREAMZAP_TIMEOUT * STREAMZAP_RESOLUTION * 1000;
 596         #endif
 597
 598         init_timer(&sz->delay_timer);
 599         sz->delay_timer.function = streamzap_delay_timeout;
 600         sz->delay_timer.data = (unsigned long)sz;
 601         spin_lock_init(&sz->timer_lock);
 602
 603         init_timer(&sz->flush_timer);
 604         sz->flush_timer.function = streamzap_flush_timeout;
 605         sz->flush_timer.data = (unsigned long)sz;
 606
 607         do_gettimeofday(&sz->signal_start);
 608
 609         /* Complete final initialisations */
 610         usb_fill_int_urb(sz->urb_in, usbdev, pipe, sz->buf_in,
 611                          maxp, (usb_complete_t)streamzap_callback,
 612                          sz, sz->endpoint->bInterval);
 613         sz->urb_in->transfer_dma = sz->dma_in;
 614         sz->urb_in->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;
 615
 616         usb_set_intfdata(intf, sz);
 617
 618         streamzap_start_flush_timer(sz);
 619
 620         dev_info(sz->dev, "Registered %s on usb%d:%d\n", name,
 621                  usbdev->bus->busnum, usbdev->devnum);
 622
 623         return 0;
 624
 625 input_dev_fail:
 626         kfifo_free(&sz->fifo);
 627 free_urb_in:
 628         usb_free_urb(sz->urb_in);
 629 free_buf_in:
 630         usb_free_coherent(usbdev, maxp, sz->buf_in, sz->dma_in);
 631 free_sz:
 632         kfree(sz);
 633
 634         return retval;
 635 }
 636
 637 /**
 638  * streamzap_disconnect
 639  *
 640  * Called by the usb core when the device is removed from the system.
 641  *
 642  * This routine guarantees that the driver will not submit any more urbs
 643  * by clearing dev->usbdev.  It is also supposed to terminate any currently
 644  * active urbs.  Unfortunately, usb_bulk_msg(), used in streamzap_read(),
 645  * does not provide any way to do this.
 646  */
 647 static void streamzap_disconnect(struct usb_interface *interface)
 648 {
 649         struct streamzap_ir *sz = usb_get_intfdata(interface);
 650         struct usb_device *usbdev = interface_to_usbdev(interface);
 651
 652         usb_set_intfdata(interface, NULL);
 653
 654         if (!sz)
 655                 return;
 656
 657         if (sz->flush) {
 658                 sz->flush = false;
 659                 del_timer_sync(&sz->flush_timer);
 660         }
 661
 662         streamzap_stop_timer(sz);
 663
 664         sz->usbdev = NULL;
 665         ir_input_unregister(sz->idev);
 666         usb_kill_urb(sz->urb_in);
 667         usb_free_urb(sz->urb_in);
 668         usb_free_coherent(usbdev, sz->buf_in_len, sz->buf_in, sz->dma_in);
 669
 670         kfree(sz);
 671 }
 672
 673 static int streamzap_suspend(struct usb_interface *intf, pm_message_t message)
 674 {
 675         struct streamzap_ir *sz = usb_get_intfdata(intf);
 676
 677         if (sz->flush) {
 678                 sz->flush = false;
 679                 del_timer_sync(&sz->flush_timer);
 680         }
 681
 682         streamzap_stop_timer(sz);
 683
 684         usb_kill_urb(sz->urb_in);
 685
 686         return 0;
 687 }
 688
 689 static int streamzap_resume(struct usb_interface *intf)
 690 {
 691         struct streamzap_ir *sz = usb_get_intfdata(intf);
 692
 693         if (sz->fifo_initialized)
 694                 kfifo_reset(&sz->fifo);
 695
 696         sz->flush_timer.expires = jiffies + HZ;
 697         sz->flush = true;
 698         add_timer(&sz->flush_timer);
 699
 700         if (usb_submit_urb(sz->urb_in, GFP_ATOMIC)) {
 701                 dev_err(sz->dev, "Error sumbiting urb\n");
 702                 return -EIO;
 703         }
 704
 705         return 0;
 706 }
 707
 708 /**
 709  *      streamzap_init
 710  */
 711 static int __init streamzap_init(void)
 712 {
 713         int ret;
 714
 715         /* register this driver with the USB subsystem */
 716         ret = usb_register(&streamzap_driver);
 717         if (ret < 0)
 718                 printk(KERN_ERR DRIVER_NAME ": usb register failed, "
 719                        "result = %d\n", ret);
 720
 721         return ret;
 722 }
 723
 724 /**
 725  *      streamzap_exit
 726  */
 727 static void __exit streamzap_exit(void)
 728 {
 729         usb_deregister(&streamzap_driver);
 730 }
 731
 732
 733 module_init(streamzap_init);
 734 module_exit(streamzap_exit);
 735
 736 MODULE_AUTHOR("Jarod Wilson <jarod@wilsonet.com>");
 737 MODULE_DESCRIPTION(DRIVER_DESC);
 738 MODULE_LICENSE("GPL");
 739
 740 module_param(debug, bool, S_IRUGO | S_IWUSR);
 741 MODULE_PARM_DESC(debug, "Enable debugging messages");