root/drivers/media/usb/au0828/au0828-core.c

DEFINITIONS

1. au0828_readreg
2. au0828_writereg
3. send_control_msg
4. recv_control_msg
5. au0828_unregister_media_device
6. au0828_usb_release
7. au0828_usb_disconnect
8. au0828_media_device_init
9. au0828_media_graph_notify
10. au0828_is_link_shareable
11. au0828_enable_source
12. au0828_disable_source
13. au0828_media_device_register
14. au0828_usb_probe
15. au0828_suspend
16. au0828_resume
17. au0828_init
18. au0828_exit

   1 // SPDX-License-Identifier: GPL-2.0-or-later
   2 /*
   3  *  Driver for the Auvitek USB bridge
   4  *
   5  *  Copyright (c) 2008 Steven Toth <stoth@linuxtv.org>
   6  */
   7 
   8 #include "au0828.h"
   9 #include "au8522.h"
  10 
  11 #include <linux/module.h>
  12 #include <linux/slab.h>
  13 #include <linux/videodev2.h>
  14 #include <media/v4l2-common.h>
  15 #include <linux/mutex.h>
  16 
  17 /* Due to enum tuner_pad_index */
  18 #include <media/tuner.h>
  19 
  20 /*
  21  * 1 = General debug messages
  22  * 2 = USB handling
  23  * 4 = I2C related
  24  * 8 = Bridge related
  25  * 16 = IR related
  26  */
  27 int au0828_debug;
  28 module_param_named(debug, au0828_debug, int, 0644);
  29 MODULE_PARM_DESC(debug,
  30                  "set debug bitmask: 1=general, 2=USB, 4=I2C, 8=bridge, 16=IR");
  31 
  32 static unsigned int disable_usb_speed_check;
  33 module_param(disable_usb_speed_check, int, 0444);
  34 MODULE_PARM_DESC(disable_usb_speed_check,
  35                  "override min bandwidth requirement of 480M bps");
  36 
  37 #define _AU0828_BULKPIPE 0x03
  38 #define _BULKPIPESIZE 0xffff
  39 
  40 static int send_control_msg(struct au0828_dev *dev, u16 request, u32 value,
  41                             u16 index);
  42 static int recv_control_msg(struct au0828_dev *dev, u16 request, u32 value,
  43         u16 index, unsigned char *cp, u16 size);
  44 
  45 /* USB Direction */
  46 #define CMD_REQUEST_IN          0x00
  47 #define CMD_REQUEST_OUT         0x01
  48 
  49 u32 au0828_readreg(struct au0828_dev *dev, u16 reg)
  50 {
  51         u8 result = 0;
  52 
  53         recv_control_msg(dev, CMD_REQUEST_IN, 0, reg, &result, 1);
  54         dprintk(8, "%s(0x%04x) = 0x%02x\n", __func__, reg, result);
  55 
  56         return result;
  57 }
  58 
  59 u32 au0828_writereg(struct au0828_dev *dev, u16 reg, u32 val)
  60 {
  61         dprintk(8, "%s(0x%04x, 0x%02x)\n", __func__, reg, val);
  62         return send_control_msg(dev, CMD_REQUEST_OUT, val, reg);
  63 }
  64 
  65 static int send_control_msg(struct au0828_dev *dev, u16 request, u32 value,
  66         u16 index)
  67 {
  68         int status = -ENODEV;
  69 
  70         if (dev->usbdev) {
  71 
  72                 /* cp must be memory that has been allocated by kmalloc */
  73                 status = usb_control_msg(dev->usbdev,
  74                                 usb_sndctrlpipe(dev->usbdev, 0),
  75                                 request,
  76                                 USB_DIR_OUT | USB_TYPE_VENDOR |
  77                                         USB_RECIP_DEVICE,
  78                                 value, index, NULL, 0, 1000);
  79 
  80                 status = min(status, 0);
  81 
  82                 if (status < 0) {
  83                         pr_err("%s() Failed sending control message, error %d.\n",
  84                                 __func__, status);
  85                 }
  86 
  87         }
  88 
  89         return status;
  90 }
  91 
  92 static int recv_control_msg(struct au0828_dev *dev, u16 request, u32 value,
  93         u16 index, unsigned char *cp, u16 size)
  94 {
  95         int status = -ENODEV;
  96         mutex_lock(&dev->mutex);
  97         if (dev->usbdev) {
  98                 status = usb_control_msg(dev->usbdev,
  99                                 usb_rcvctrlpipe(dev->usbdev, 0),
 100                                 request,
 101                                 USB_DIR_IN | USB_TYPE_VENDOR | USB_RECIP_DEVICE,
 102                                 value, index,
 103                                 dev->ctrlmsg, size, 1000);
 104 
 105                 status = min(status, 0);
 106 
 107                 if (status < 0) {
 108                         pr_err("%s() Failed receiving control message, error %d.\n",
 109                                 __func__, status);
 110                 }
 111 
 112                 /* the host controller requires heap allocated memory, which
 113                    is why we didn't just pass "cp" into usb_control_msg */
 114                 memcpy(cp, dev->ctrlmsg, size);
 115         }
 116         mutex_unlock(&dev->mutex);
 117         return status;
 118 }
 119 
 120 #ifdef CONFIG_MEDIA_CONTROLLER
 121 static void au0828_media_graph_notify(struct media_entity *new,
 122                                       void *notify_data);
 123 #endif
 124 
 125 static void au0828_unregister_media_device(struct au0828_dev *dev)
 126 {
 127 #ifdef CONFIG_MEDIA_CONTROLLER
 128         struct media_device *mdev = dev->media_dev;
 129         struct media_entity_notify *notify, *nextp;
 130 
 131         if (!mdev || !media_devnode_is_registered(mdev->devnode))
 132                 return;
 133 
 134         /* Remove au0828 entity_notify callbacks */
 135         list_for_each_entry_safe(notify, nextp, &mdev->entity_notify, list) {
 136                 if (notify->notify != au0828_media_graph_notify)
 137                         continue;
 138                 media_device_unregister_entity_notify(mdev, notify);
 139         }
 140 
 141         /* clear enable_source, disable_source */
 142         mutex_lock(&mdev->graph_mutex);
 143         dev->media_dev->source_priv = NULL;
 144         dev->media_dev->enable_source = NULL;
 145         dev->media_dev->disable_source = NULL;
 146         mutex_unlock(&mdev->graph_mutex);
 147 
 148         media_device_delete(dev->media_dev, KBUILD_MODNAME, THIS_MODULE);
 149         dev->media_dev = NULL;
 150 #endif
 151 }
 152 
 153 void au0828_usb_release(struct au0828_dev *dev)
 154 {
 155         au0828_unregister_media_device(dev);
 156 
 157         /* I2C */
 158         au0828_i2c_unregister(dev);
 159 
 160         kfree(dev);
 161 }
 162 
 163 static void au0828_usb_disconnect(struct usb_interface *interface)
 164 {
 165         struct au0828_dev *dev = usb_get_intfdata(interface);
 166 
 167         dprintk(1, "%s()\n", __func__);
 168 
 169         /* there is a small window after disconnect, before
 170            dev->usbdev is NULL, for poll (e.g: IR) try to access
 171            the device and fill the dmesg with error messages.
 172            Set the status so poll routines can check and avoid
 173            access after disconnect.
 174         */
 175         set_bit(DEV_DISCONNECTED, &dev->dev_state);
 176 
 177         au0828_rc_unregister(dev);
 178         /* Digital TV */
 179         au0828_dvb_unregister(dev);
 180 
 181         usb_set_intfdata(interface, NULL);
 182         mutex_lock(&dev->mutex);
 183         dev->usbdev = NULL;
 184         mutex_unlock(&dev->mutex);
 185         if (au0828_analog_unregister(dev)) {
 186                 /*
 187                  * No need to call au0828_usb_release() if V4L2 is enabled,
 188                  * as this is already called via au0828_usb_v4l2_release()
 189                  */
 190                 return;
 191         }
 192         au0828_usb_release(dev);
 193 }
 194 
 195 static int au0828_media_device_init(struct au0828_dev *dev,
 196                                     struct usb_device *udev)
 197 {
 198 #ifdef CONFIG_MEDIA_CONTROLLER
 199         struct media_device *mdev;
 200 
 201         mdev = media_device_usb_allocate(udev, KBUILD_MODNAME, THIS_MODULE);
 202         if (!mdev)
 203                 return -ENOMEM;
 204 
 205         dev->media_dev = mdev;
 206 #endif
 207         return 0;
 208 }
 209 
 210 #ifdef CONFIG_MEDIA_CONTROLLER
 211 static void au0828_media_graph_notify(struct media_entity *new,
 212                                       void *notify_data)
 213 {
 214         struct au0828_dev *dev = (struct au0828_dev *) notify_data;
 215         int ret;
 216         struct media_entity *entity, *mixer = NULL, *decoder = NULL;
 217 
 218         if (!new) {
 219                 /*
 220                  * Called during au0828 probe time to connect
 221                  * entities that were created prior to registering
 222                  * the notify handler. Find mixer and decoder.
 223                 */
 224                 media_device_for_each_entity(entity, dev->media_dev) {
 225                         if (entity->function == MEDIA_ENT_F_AUDIO_MIXER)
 226                                 mixer = entity;
 227                         else if (entity->function == MEDIA_ENT_F_ATV_DECODER)
 228                                 decoder = entity;
 229                 }
 230                 goto create_link;
 231         }
 232 
 233         switch (new->function) {
 234         case MEDIA_ENT_F_AUDIO_MIXER:
 235                 mixer = new;
 236                 if (dev->decoder)
 237                         decoder = dev->decoder;
 238                 break;
 239         case MEDIA_ENT_F_ATV_DECODER:
 240                 /* In case, Mixer is added first, find mixer and create link */
 241                 media_device_for_each_entity(entity, dev->media_dev) {
 242                         if (entity->function == MEDIA_ENT_F_AUDIO_MIXER)
 243                                 mixer = entity;
 244                 }
 245                 decoder = new;
 246                 break;
 247         default:
 248                 break;
 249         }
 250 
 251 create_link:
 252         if (decoder && mixer) {
 253                 ret = media_get_pad_index(decoder, false,
 254                                           PAD_SIGNAL_AUDIO);
 255                 if (ret >= 0)
 256                         ret = media_create_pad_link(decoder, ret,
 257                                                     mixer, 0,
 258                                                     MEDIA_LNK_FL_ENABLED);
 259                 if (ret < 0)
 260                         dev_err(&dev->usbdev->dev,
 261                                 "Mixer Pad Link Create Error: %d\n", ret);
 262         }
 263 }
 264 
 265 static bool au0828_is_link_shareable(struct media_entity *owner,
 266                                      struct media_entity *entity)
 267 {
 268         bool shareable = false;
 269 
 270         /* Tuner link can be shared by audio, video, and VBI */
 271         switch (owner->function) {
 272         case MEDIA_ENT_F_IO_V4L:
 273         case MEDIA_ENT_F_AUDIO_CAPTURE:
 274         case MEDIA_ENT_F_IO_VBI:
 275                 if (entity->function == MEDIA_ENT_F_IO_V4L ||
 276                     entity->function == MEDIA_ENT_F_AUDIO_CAPTURE ||
 277                     entity->function == MEDIA_ENT_F_IO_VBI)
 278                         shareable = true;
 279                 break;
 280         case MEDIA_ENT_F_DTV_DEMOD:
 281         default:
 282                 break;
 283         }
 284         return shareable;
 285 }
 286 
 287 /* Callers should hold graph_mutex */
 288 static int au0828_enable_source(struct media_entity *entity,
 289                                 struct media_pipeline *pipe)
 290 {
 291         struct media_entity  *source, *find_source;
 292         struct media_entity *sink;
 293         struct media_link *link, *found_link = NULL;
 294         int ret = 0;
 295         struct media_device *mdev = entity->graph_obj.mdev;
 296         struct au0828_dev *dev;
 297 
 298         if (!mdev)
 299                 return -ENODEV;
 300 
 301         dev = mdev->source_priv;
 302 
 303         /*
 304          * For Audio and V4L2 entity, find the link to which decoder
 305          * is the sink. Look for an active link between decoder and
 306          * source (tuner/s-video/Composite), if one exists, nothing
 307          * to do. If not, look for any  active links between source
 308          * and any other entity. If one exists, source is busy. If
 309          * source is free, setup link and start pipeline from source.
 310          * For DVB FE entity, the source for the link is the tuner.
 311          * Check if tuner is available and setup link and start
 312          * pipeline.
 313         */
 314         if (entity->function == MEDIA_ENT_F_DTV_DEMOD) {
 315                 sink = entity;
 316                 find_source = dev->tuner;
 317         } else {
 318                 /* Analog isn't configured or register failed */
 319                 if (!dev->decoder) {
 320                         ret = -ENODEV;
 321                         goto end;
 322                 }
 323 
 324                 sink = dev->decoder;
 325 
 326                 /*
 327                  * Default input is tuner and default input_type
 328                  * is AU0828_VMUX_TELEVISION.
 329                  *
 330                  * There is a problem when s_input is called to
 331                  * change the default input. s_input will try to
 332                  * enable_source before attempting to change the
 333                  * input on the device, and will end up enabling
 334                  * default source which is tuner.
 335                  *
 336                  * Additional logic is necessary in au0828 to detect
 337                  * that the input has changed and enable the right
 338                  * source. au0828 handles this case in its s_input.
 339                  * It will disable the old source and enable the new
 340                  * source.
 341                  *
 342                 */
 343                 if (dev->input_type == AU0828_VMUX_TELEVISION)
 344                         find_source = dev->tuner;
 345                 else if (dev->input_type == AU0828_VMUX_SVIDEO ||
 346                          dev->input_type == AU0828_VMUX_COMPOSITE)
 347                         find_source = &dev->input_ent[dev->input_type];
 348                 else {
 349                         /* unknown input - let user select input */
 350                         ret = 0;
 351                         goto end;
 352                 }
 353         }
 354 
 355         /* Is there an active link between sink and source */
 356         if (dev->active_link) {
 357                 if (dev->active_link_owner == entity) {
 358                         /* This check is necessary to handle multiple
 359                          * enable_source calls from v4l_ioctls during
 360                          * the course of video/vbi application run-time.
 361                         */
 362                         pr_debug("%s already owns the tuner\n", entity->name);
 363                         ret = 0;
 364                         goto end;
 365                 } else if (au0828_is_link_shareable(dev->active_link_owner,
 366                            entity)) {
 367                         /* Either ALSA or Video own tuner. Sink is the same
 368                          * for both. Allow sharing the active link between
 369                          * their common source (tuner) and sink (decoder).
 370                          * Starting pipeline between sharing entity and sink
 371                          * will fail with pipe mismatch, while owner has an
 372                          * active pipeline. Switch pipeline ownership from
 373                          * user to owner when owner disables the source.
 374                          */
 375                         dev->active_link_shared = true;
 376                         /* save the user info to use from disable */
 377                         dev->active_link_user = entity;
 378                         dev->active_link_user_pipe = pipe;
 379                         pr_debug("%s owns the tuner %s can share!\n",
 380                                  dev->active_link_owner->name,
 381                                  entity->name);
 382                         ret = 0;
 383                         goto end;
 384                 } else {
 385                         ret = -EBUSY;
 386                         goto end;
 387                 }
 388         }
 389 
 390         list_for_each_entry(link, &sink->links, list) {
 391                 /* Check sink, and source */
 392                 if (link->sink->entity == sink &&
 393                     link->source->entity == find_source) {
 394                         found_link = link;
 395                         break;
 396                 }
 397         }
 398 
 399         if (!found_link) {
 400                 ret = -ENODEV;
 401                 goto end;
 402         }
 403 
 404         /* activate link between source and sink and start pipeline */
 405         source = found_link->source->entity;
 406         ret = __media_entity_setup_link(found_link, MEDIA_LNK_FL_ENABLED);
 407         if (ret) {
 408                 pr_err("Activate link from %s->%s. Error %d\n",
 409                         source->name, sink->name, ret);
 410                 goto end;
 411         }
 412 
 413         ret = __media_pipeline_start(entity, pipe);
 414         if (ret) {
 415                 pr_err("Start Pipeline: %s->%s Error %d\n",
 416                         source->name, entity->name, ret);
 417                 ret = __media_entity_setup_link(found_link, 0);
 418                 if (ret)
 419                         pr_err("Deactivate link Error %d\n", ret);
 420                 goto end;
 421         }
 422 
 423         /* save link state to allow audio and video share the link
 424          * and not disable the link while the other is using it.
 425          * active_link_owner is used to deactivate the link.
 426         */
 427         dev->active_link = found_link;
 428         dev->active_link_owner = entity;
 429         dev->active_source = source;
 430         dev->active_sink = sink;
 431 
 432         pr_info("Enabled Source: %s->%s->%s Ret %d\n",
 433                  dev->active_source->name, dev->active_sink->name,
 434                  dev->active_link_owner->name, ret);
 435 end:
 436         pr_debug("%s end: ent:%s fnc:%d ret %d\n",
 437                  __func__, entity->name, entity->function, ret);
 438         return ret;
 439 }
 440 
 441 /* Callers should hold graph_mutex */
 442 static void au0828_disable_source(struct media_entity *entity)
 443 {
 444         int ret = 0;
 445         struct media_device *mdev = entity->graph_obj.mdev;
 446         struct au0828_dev *dev;
 447 
 448         if (!mdev)
 449                 return;
 450 
 451         dev = mdev->source_priv;
 452 
 453         if (!dev->active_link)
 454                 return;
 455 
 456         /* link is active - stop pipeline from source
 457          * (tuner/s-video/Composite) to the entity
 458          * When DVB/s-video/Composite owns tuner, it won't be in
 459          * shared state.
 460          */
 461         if (dev->active_link->sink->entity == dev->active_sink &&
 462             dev->active_link->source->entity == dev->active_source) {
 463                 /*
 464                  * Prevent video from deactivating link when audio
 465                  * has active pipeline and vice versa. In addition
 466                  * handle the case when more than one video/vbi
 467                  * application is sharing the link.
 468                 */
 469                 bool owner_is_audio = false;
 470 
 471                 if (dev->active_link_owner->function ==
 472                     MEDIA_ENT_F_AUDIO_CAPTURE)
 473                         owner_is_audio = true;
 474 
 475                 if (dev->active_link_shared) {
 476                         pr_debug("Shared link owner %s user %s %d\n",
 477                                  dev->active_link_owner->name,
 478                                  entity->name, dev->users);
 479 
 480                         /* Handle video device users > 1
 481                          * When audio owns the shared link with
 482                          * more than one video users, avoid
 483                          * disabling the source and/or switching
 484                          * the owner until the last disable_source
 485                          * call from video _close(). Use dev->users to
 486                          * determine when to switch/disable.
 487                          */
 488                         if (dev->active_link_owner != entity) {
 489                                 /* video device has users > 1 */
 490                                 if (owner_is_audio && dev->users > 1)
 491                                         return;
 492 
 493                                 dev->active_link_user = NULL;
 494                                 dev->active_link_user_pipe = NULL;
 495                                 dev->active_link_shared = false;
 496                                 return;
 497                         }
 498 
 499                         /* video owns the link and has users > 1 */
 500                         if (!owner_is_audio && dev->users > 1)
 501                                 return;
 502 
 503                         /* stop pipeline */
 504                         __media_pipeline_stop(dev->active_link_owner);
 505                         pr_debug("Pipeline stop for %s\n",
 506                                 dev->active_link_owner->name);
 507 
 508                         ret = __media_pipeline_start(
 509                                         dev->active_link_user,
 510                                         dev->active_link_user_pipe);
 511                         if (ret) {
 512                                 pr_err("Start Pipeline: %s->%s %d\n",
 513                                         dev->active_source->name,
 514                                         dev->active_link_user->name,
 515                                         ret);
 516                                 goto deactivate_link;
 517                         }
 518                         /* link user is now the owner */
 519                         dev->active_link_owner = dev->active_link_user;
 520                         dev->active_link_user = NULL;
 521                         dev->active_link_user_pipe = NULL;
 522                         dev->active_link_shared = false;
 523 
 524                         pr_debug("Pipeline started for %s\n",
 525                                 dev->active_link_owner->name);
 526                         return;
 527                 } else if (!owner_is_audio && dev->users > 1)
 528                         /* video/vbi owns the link and has users > 1 */
 529                         return;
 530 
 531                 if (dev->active_link_owner != entity)
 532                         return;
 533 
 534                 /* stop pipeline */
 535                 __media_pipeline_stop(dev->active_link_owner);
 536                 pr_debug("Pipeline stop for %s\n",
 537                         dev->active_link_owner->name);
 538 
 539 deactivate_link:
 540                 ret = __media_entity_setup_link(dev->active_link, 0);
 541                 if (ret)
 542                         pr_err("Deactivate link Error %d\n", ret);
 543 
 544                 pr_info("Disabled Source: %s->%s->%s Ret %d\n",
 545                          dev->active_source->name, dev->active_sink->name,
 546                          dev->active_link_owner->name, ret);
 547 
 548                 dev->active_link = NULL;
 549                 dev->active_link_owner = NULL;
 550                 dev->active_source = NULL;
 551                 dev->active_sink = NULL;
 552                 dev->active_link_shared = false;
 553                 dev->active_link_user = NULL;
 554         }
 555 }
 556 #endif
 557 
 558 static int au0828_media_device_register(struct au0828_dev *dev,
 559                                         struct usb_device *udev)
 560 {
 561 #ifdef CONFIG_MEDIA_CONTROLLER
 562         int ret;
 563         struct media_entity *entity, *demod = NULL;
 564         struct media_link *link;
 565 
 566         if (!dev->media_dev)
 567                 return 0;
 568 
 569         if (!media_devnode_is_registered(dev->media_dev->devnode)) {
 570 
 571                 /* register media device */
 572                 ret = media_device_register(dev->media_dev);
 573                 if (ret) {
 574                         media_device_delete(dev->media_dev, KBUILD_MODNAME,
 575                                             THIS_MODULE);
 576                         dev->media_dev = NULL;
 577                         dev_err(&udev->dev,
 578                                 "Media Device Register Error: %d\n", ret);
 579                         return ret;
 580                 }
 581         } else {
 582                 /*
 583                  * Call au0828_media_graph_notify() to connect
 584                  * audio graph to our graph. In this case, audio
 585                  * driver registered the device and there is no
 586                  * entity_notify to be called when new entities
 587                  * are added. Invoke it now.
 588                 */
 589                 au0828_media_graph_notify(NULL, (void *) dev);
 590         }
 591 
 592         /*
 593          * Find tuner, decoder and demod.
 594          *
 595          * The tuner and decoder should be cached, as they'll be used by
 596          *      au0828_enable_source.
 597          *
 598          * It also needs to disable the link between tuner and
 599          * decoder/demod, to avoid disable step when tuner is requested
 600          * by video or audio. Note that this step can't be done until dvb
 601          * graph is created during dvb register.
 602         */
 603         media_device_for_each_entity(entity, dev->media_dev) {
 604                 switch (entity->function) {
 605                 case MEDIA_ENT_F_TUNER:
 606                         dev->tuner = entity;
 607                         break;
 608                 case MEDIA_ENT_F_ATV_DECODER:
 609                         dev->decoder = entity;
 610                         break;
 611                 case MEDIA_ENT_F_DTV_DEMOD:
 612                         demod = entity;
 613                         break;
 614                 }
 615         }
 616 
 617         /* Disable link between tuner->demod and/or tuner->decoder */
 618         if (dev->tuner) {
 619                 list_for_each_entry(link, &dev->tuner->links, list) {
 620                         if (demod && link->sink->entity == demod)
 621                                 media_entity_setup_link(link, 0);
 622                         if (dev->decoder && link->sink->entity == dev->decoder)
 623                                 media_entity_setup_link(link, 0);
 624                 }
 625         }
 626 
 627         /* register entity_notify callback */
 628         dev->entity_notify.notify_data = (void *) dev;
 629         dev->entity_notify.notify = (void *) au0828_media_graph_notify;
 630         ret = media_device_register_entity_notify(dev->media_dev,
 631                                                   &dev->entity_notify);
 632         if (ret) {
 633                 dev_err(&udev->dev,
 634                         "Media Device register entity_notify Error: %d\n",
 635                         ret);
 636                 return ret;
 637         }
 638         /* set enable_source */
 639         mutex_lock(&dev->media_dev->graph_mutex);
 640         dev->media_dev->source_priv = (void *) dev;
 641         dev->media_dev->enable_source = au0828_enable_source;
 642         dev->media_dev->disable_source = au0828_disable_source;
 643         mutex_unlock(&dev->media_dev->graph_mutex);
 644 #endif
 645         return 0;
 646 }
 647 
 648 static int au0828_usb_probe(struct usb_interface *interface,
 649         const struct usb_device_id *id)
 650 {
 651         int ifnum;
 652         int retval = 0;
 653 
 654         struct au0828_dev *dev;
 655         struct usb_device *usbdev = interface_to_usbdev(interface);
 656 
 657         ifnum = interface->altsetting->desc.bInterfaceNumber;
 658 
 659         if (ifnum != 0)
 660                 return -ENODEV;
 661 
 662         dprintk(1, "%s() vendor id 0x%x device id 0x%x ifnum:%d\n", __func__,
 663                 le16_to_cpu(usbdev->descriptor.idVendor),
 664                 le16_to_cpu(usbdev->descriptor.idProduct),
 665                 ifnum);
 666 
 667         /*
 668          * Make sure we have 480 Mbps of bandwidth, otherwise things like
 669          * video stream wouldn't likely work, since 12 Mbps is generally
 670          * not enough even for most Digital TV streams.
 671          */
 672         if (usbdev->speed != USB_SPEED_HIGH && disable_usb_speed_check == 0) {
 673                 pr_err("au0828: Device initialization failed.\n");
 674                 pr_err("au0828: Device must be connected to a high-speed USB 2.0 port.\n");
 675                 return -ENODEV;
 676         }
 677 
 678         dev = kzalloc(sizeof(*dev), GFP_KERNEL);
 679         if (dev == NULL) {
 680                 pr_err("%s() Unable to allocate memory\n", __func__);
 681                 return -ENOMEM;
 682         }
 683 
 684         mutex_init(&dev->lock);
 685         mutex_lock(&dev->lock);
 686         mutex_init(&dev->mutex);
 687         mutex_init(&dev->dvb.lock);
 688         dev->usbdev = usbdev;
 689         dev->boardnr = id->driver_info;
 690         dev->board = au0828_boards[dev->boardnr];
 691 
 692         /* Initialize the media controller */
 693         retval = au0828_media_device_init(dev, usbdev);
 694         if (retval) {
 695                 pr_err("%s() au0828_media_device_init failed\n",
 696                        __func__);
 697                 mutex_unlock(&dev->lock);
 698                 kfree(dev);
 699                 return retval;
 700         }
 701 
 702         retval = au0828_v4l2_device_register(interface, dev);
 703         if (retval) {
 704                 au0828_usb_v4l2_media_release(dev);
 705                 mutex_unlock(&dev->lock);
 706                 kfree(dev);
 707                 return retval;
 708         }
 709 
 710         /* Power Up the bridge */
 711         au0828_write(dev, REG_600, 1 << 4);
 712 
 713         /* Bring up the GPIO's and supporting devices */
 714         au0828_gpio_setup(dev);
 715 
 716         /* I2C */
 717         au0828_i2c_register(dev);
 718 
 719         /* Setup */
 720         au0828_card_setup(dev);
 721 
 722         /*
 723          * Store the pointer to the au0828_dev so it can be accessed in
 724          * au0828_usb_disconnect
 725          */
 726         usb_set_intfdata(interface, dev);
 727 
 728         /* Analog TV */
 729         retval = au0828_analog_register(dev, interface);
 730         if (retval) {
 731                 pr_err("%s() au0828_analog_register failed to register on V4L2\n",
 732                         __func__);
 733                 mutex_unlock(&dev->lock);
 734                 goto done;
 735         }
 736 
 737         /* Digital TV */
 738         retval = au0828_dvb_register(dev);
 739         if (retval)
 740                 pr_err("%s() au0828_dvb_register failed\n",
 741                        __func__);
 742 
 743         /* Remote controller */
 744         au0828_rc_register(dev);
 745 
 746         pr_info("Registered device AU0828 [%s]\n",
 747                 dev->board.name == NULL ? "Unset" : dev->board.name);
 748 
 749         mutex_unlock(&dev->lock);
 750 
 751         retval = au0828_media_device_register(dev, usbdev);
 752 
 753 done:
 754         if (retval < 0)
 755                 au0828_usb_disconnect(interface);
 756 
 757         return retval;
 758 }
 759 
 760 static int au0828_suspend(struct usb_interface *interface,
 761                                 pm_message_t message)
 762 {
 763         struct au0828_dev *dev = usb_get_intfdata(interface);
 764 
 765         if (!dev)
 766                 return 0;
 767 
 768         pr_info("Suspend\n");
 769 
 770         au0828_rc_suspend(dev);
 771         au0828_v4l2_suspend(dev);
 772         au0828_dvb_suspend(dev);
 773 
 774         /* FIXME: should suspend also ATV/DTV */
 775 
 776         return 0;
 777 }
 778 
 779 static int au0828_resume(struct usb_interface *interface)
 780 {
 781         struct au0828_dev *dev = usb_get_intfdata(interface);
 782         if (!dev)
 783                 return 0;
 784 
 785         pr_info("Resume\n");
 786 
 787         /* Power Up the bridge */
 788         au0828_write(dev, REG_600, 1 << 4);
 789 
 790         /* Bring up the GPIO's and supporting devices */
 791         au0828_gpio_setup(dev);
 792 
 793         au0828_rc_resume(dev);
 794         au0828_v4l2_resume(dev);
 795         au0828_dvb_resume(dev);
 796 
 797         /* FIXME: should resume also ATV/DTV */
 798 
 799         return 0;
 800 }
 801 
 802 static struct usb_driver au0828_usb_driver = {
 803         .name           = KBUILD_MODNAME,
 804         .probe          = au0828_usb_probe,
 805         .disconnect     = au0828_usb_disconnect,
 806         .id_table       = au0828_usb_id_table,
 807         .suspend        = au0828_suspend,
 808         .resume         = au0828_resume,
 809         .reset_resume   = au0828_resume,
 810 };
 811 
 812 static int __init au0828_init(void)
 813 {
 814         int ret;
 815 
 816         if (au0828_debug & 1)
 817                 pr_info("%s() Debugging is enabled\n", __func__);
 818 
 819         if (au0828_debug & 2)
 820                 pr_info("%s() USB Debugging is enabled\n", __func__);
 821 
 822         if (au0828_debug & 4)
 823                 pr_info("%s() I2C Debugging is enabled\n", __func__);
 824 
 825         if (au0828_debug & 8)
 826                 pr_info("%s() Bridge Debugging is enabled\n",
 827                        __func__);
 828 
 829         if (au0828_debug & 16)
 830                 pr_info("%s() IR Debugging is enabled\n",
 831                        __func__);
 832 
 833         pr_info("au0828 driver loaded\n");
 834 
 835         ret = usb_register(&au0828_usb_driver);
 836         if (ret)
 837                 pr_err("usb_register failed, error = %d\n", ret);
 838 
 839         return ret;
 840 }
 841 
 842 static void __exit au0828_exit(void)
 843 {
 844         usb_deregister(&au0828_usb_driver);
 845 }
 846 
 847 module_init(au0828_init);
 848 module_exit(au0828_exit);
 849 
 850 MODULE_DESCRIPTION("Driver for Auvitek AU0828 based products");
 851 MODULE_AUTHOR("Steven Toth <stoth@linuxtv.org>");
 852 MODULE_LICENSE("GPL");
 853 MODULE_VERSION("0.0.3");