kernel/drivers/media/usb/au0828/au0828-dvb.c

   1 /*
   2  *  Driver for the Auvitek USB bridge
   3  *
   4  *  Copyright (c) 2008 Steven Toth <stoth@linuxtv.org>
   5  *
   6  *  This program is free software; you can redistribute it and/or modify
   7  *  it under the terms of the GNU General Public License as published by
   8  *  the Free Software Foundation; either version 2 of the License, or
   9  *  (at your option) any later version.
  10  *
  11  *  This program is distributed in the hope that it will be useful,
  12  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14  *
  15  *  GNU General Public License for more details.
  16  *
  17  *  You should have received a copy of the GNU General Public License
  18  *  along with this program; if not, write to the Free Software
  19  *  Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  20  */
  21
  22 #include "au0828.h"
  23
  24 #include <linux/module.h>
  25 #include <linux/slab.h>
  26 #include <linux/init.h>
  27 #include <linux/device.h>
  28 #include <media/v4l2-common.h>
  29 #include <media/tuner.h>
  30
  31 #include "au8522.h"
  32 #include "xc5000.h"
  33 #include "mxl5007t.h"
  34 #include "tda18271.h"
  35
  36 static int preallocate_big_buffers;
  37 module_param_named(preallocate_big_buffers, preallocate_big_buffers, int, 0644);
  38 MODULE_PARM_DESC(preallocate_big_buffers, "Preallocate the larger transfer buffers at module load time");
  39
  40 DVB_DEFINE_MOD_OPT_ADAPTER_NR(adapter_nr);
  41
  42 #define _AU0828_BULKPIPE 0x83
  43 #define _BULKPIPESIZE 0xe522
  44
  45 static u8 hauppauge_hvr950q_led_states[] = {
  46         0x00, /* off */
  47         0x02, /* yellow */
  48         0x04, /* green */
  49 };
  50
  51 static struct au8522_led_config hauppauge_hvr950q_led_cfg = {
  52         .gpio_output = 0x00e0,
  53         .gpio_output_enable  = 0x6006,
  54         .gpio_output_disable = 0x0660,
  55
  56         .gpio_leds = 0x00e2,
  57         .led_states  = hauppauge_hvr950q_led_states,
  58         .num_led_states = sizeof(hauppauge_hvr950q_led_states),
  59
  60         .vsb8_strong   = 20 /* dB */ * 10,
  61         .qam64_strong  = 25 /* dB */ * 10,
  62         .qam256_strong = 32 /* dB */ * 10,
  63 };
  64
  65 static struct au8522_config hauppauge_hvr950q_config = {
  66         .demod_address = 0x8e >> 1,
  67         .status_mode   = AU8522_DEMODLOCKING,
  68         .qam_if        = AU8522_IF_6MHZ,
  69         .vsb_if        = AU8522_IF_6MHZ,
  70         .led_cfg       = &hauppauge_hvr950q_led_cfg,
  71 };
  72
  73 static struct au8522_config fusionhdtv7usb_config = {
  74         .demod_address = 0x8e >> 1,
  75         .status_mode   = AU8522_DEMODLOCKING,
  76         .qam_if        = AU8522_IF_6MHZ,
  77         .vsb_if        = AU8522_IF_6MHZ,
  78 };
  79
  80 static struct au8522_config hauppauge_woodbury_config = {
  81         .demod_address = 0x8e >> 1,
  82         .status_mode   = AU8522_DEMODLOCKING,
  83         .qam_if        = AU8522_IF_4MHZ,
  84         .vsb_if        = AU8522_IF_3_25MHZ,
  85 };
  86
  87 static struct xc5000_config hauppauge_xc5000a_config = {
  88         .i2c_address      = 0x61,
  89         .if_khz           = 6000,
  90         .chip_id          = XC5000A,
  91         .output_amp       = 0x8f,
  92 };
  93
  94 static struct xc5000_config hauppauge_xc5000c_config = {
  95         .i2c_address      = 0x61,
  96         .if_khz           = 6000,
  97         .chip_id          = XC5000C,
  98         .output_amp       = 0x8f,
  99 };
 100
 101 static struct mxl5007t_config mxl5007t_hvr950q_config = {
 102         .xtal_freq_hz = MxL_XTAL_24_MHZ,
 103         .if_freq_hz = MxL_IF_6_MHZ,
 104 };
 105
 106 static struct tda18271_config hauppauge_woodbury_tunerconfig = {
 107         .gate    = TDA18271_GATE_DIGITAL,
 108 };
 109
 110 static void au0828_restart_dvb_streaming(struct work_struct *work);
 111
 112 /*-------------------------------------------------------------------*/
 113 static void urb_completion(struct urb *purb)
 114 {
 115         struct au0828_dev *dev = purb->context;
 116         int ptype = usb_pipetype(purb->pipe);
 117         unsigned char *ptr;
 118
 119         dprintk(2, "%s: %d\n", __func__, purb->actual_length);
 120
 121         if (!dev) {
 122                 dprintk(2, "%s: no dev!\n", __func__);
 123                 return;
 124         }
 125
 126         if (!dev->urb_streaming) {
 127                 dprintk(2, "%s: not streaming!\n", __func__);
 128                 return;
 129         }
 130
 131         if (ptype != PIPE_BULK) {
 132                 pr_err("%s: Unsupported URB type %d\n",
 133                        __func__, ptype);
 134                 return;
 135         }
 136
 137         /* See if the stream is corrupted (to work around a hardware
 138            bug where the stream gets misaligned */
 139         ptr = purb->transfer_buffer;
 140         if (purb->actual_length > 0 && ptr[0] != 0x47) {
 141                 dprintk(1, "Need to restart streaming %02x len=%d!\n",
 142                         ptr[0], purb->actual_length);
 143                 schedule_work(&dev->restart_streaming);
 144                 return;
 145         }
 146
 147         /* Feed the transport payload into the kernel demux */
 148         dvb_dmx_swfilter_packets(&dev->dvb.demux,
 149                 purb->transfer_buffer, purb->actual_length / 188);
 150
 151         /* Clean the buffer before we requeue */
 152         memset(purb->transfer_buffer, 0, URB_BUFSIZE);
 153
 154         /* Requeue URB */
 155         usb_submit_urb(purb, GFP_ATOMIC);
 156 }
 157
 158 static int stop_urb_transfer(struct au0828_dev *dev)
 159 {
 160         int i;
 161
 162         dprintk(2, "%s()\n", __func__);
 163
 164         if (!dev->urb_streaming)
 165                 return 0;
 166
 167         dev->urb_streaming = false;
 168         for (i = 0; i < URB_COUNT; i++) {
 169                 if (dev->urbs[i]) {
 170                         usb_kill_urb(dev->urbs[i]);
 171                         if (!preallocate_big_buffers)
 172                                 kfree(dev->urbs[i]->transfer_buffer);
 173
 174                         usb_free_urb(dev->urbs[i]);
 175                 }
 176         }
 177
 178         return 0;
 179 }
 180
 181 static int start_urb_transfer(struct au0828_dev *dev)
 182 {
 183         struct urb *purb;
 184         int i, ret = -ENOMEM;
 185
 186         dprintk(2, "%s()\n", __func__);
 187
 188         if (dev->urb_streaming) {
 189                 dprintk(2, "%s: bulk xfer already running!\n", __func__);
 190                 return 0;
 191         }
 192
 193         for (i = 0; i < URB_COUNT; i++) {
 194
 195                 dev->urbs[i] = usb_alloc_urb(0, GFP_KERNEL);
 196                 if (!dev->urbs[i])
 197                         goto err;
 198
 199                 purb = dev->urbs[i];
 200
 201                 if (preallocate_big_buffers)
 202                         purb->transfer_buffer = dev->dig_transfer_buffer[i];
 203                 else
 204                         purb->transfer_buffer = kzalloc(URB_BUFSIZE,
 205                                         GFP_KERNEL);
 206
 207                 if (!purb->transfer_buffer) {
 208                         usb_free_urb(purb);
 209                         dev->urbs[i] = NULL;
 210                         pr_err("%s: failed big buffer allocation, err = %d\n",
 211                                __func__, ret);
 212                         goto err;
 213                 }
 214
 215                 purb->status = -EINPROGRESS;
 216                 usb_fill_bulk_urb(purb,
 217                                   dev->usbdev,
 218                                   usb_rcvbulkpipe(dev->usbdev,
 219                                         _AU0828_BULKPIPE),
 220                                   purb->transfer_buffer,
 221                                   URB_BUFSIZE,
 222                                   urb_completion,
 223                                   dev);
 224
 225         }
 226
 227         for (i = 0; i < URB_COUNT; i++) {
 228                 ret = usb_submit_urb(dev->urbs[i], GFP_ATOMIC);
 229                 if (ret != 0) {
 230                         stop_urb_transfer(dev);
 231                         pr_err("%s: failed urb submission, err = %d\n",
 232                                __func__, ret);
 233                         return ret;
 234                 }
 235         }
 236
 237         dev->urb_streaming = true;
 238         ret = 0;
 239
 240 err:
 241         return ret;
 242 }
 243
 244 static void au0828_start_transport(struct au0828_dev *dev)
 245 {
 246         au0828_write(dev, 0x608, 0x90);
 247         au0828_write(dev, 0x609, 0x72);
 248         au0828_write(dev, 0x60a, 0x71);
 249         au0828_write(dev, 0x60b, 0x01);
 250
 251 }
 252
 253 static void au0828_stop_transport(struct au0828_dev *dev, int full_stop)
 254 {
 255         if (full_stop) {
 256                 au0828_write(dev, 0x608, 0x00);
 257                 au0828_write(dev, 0x609, 0x00);
 258                 au0828_write(dev, 0x60a, 0x00);
 259         }
 260         au0828_write(dev, 0x60b, 0x00);
 261 }
 262
 263 static int au0828_dvb_start_feed(struct dvb_demux_feed *feed)
 264 {
 265         struct dvb_demux *demux = feed->demux;
 266         struct au0828_dev *dev = (struct au0828_dev *) demux->priv;
 267         struct au0828_dvb *dvb = &dev->dvb;
 268         int ret = 0;
 269
 270         dprintk(1, "%s()\n", __func__);
 271
 272         if (!demux->dmx.frontend)
 273                 return -EINVAL;
 274
 275         if (dvb->frontend) {
 276                 mutex_lock(&dvb->lock);
 277                 dvb->start_count++;
 278                 dprintk(1, "%s(), start_count: %d, stop_count: %d\n", __func__,
 279                         dvb->start_count, dvb->stop_count);
 280                 if (dvb->feeding++ == 0) {
 281                         /* Start transport */
 282                         au0828_start_transport(dev);
 283                         ret = start_urb_transfer(dev);
 284                         if (ret < 0) {
 285                                 au0828_stop_transport(dev, 0);
 286                                 dvb->feeding--; /* We ran out of memory... */
 287                         }
 288                 }
 289                 mutex_unlock(&dvb->lock);
 290         }
 291
 292         return ret;
 293 }
 294
 295 static int au0828_dvb_stop_feed(struct dvb_demux_feed *feed)
 296 {
 297         struct dvb_demux *demux = feed->demux;
 298         struct au0828_dev *dev = (struct au0828_dev *) demux->priv;
 299         struct au0828_dvb *dvb = &dev->dvb;
 300         int ret = 0;
 301
 302         dprintk(1, "%s()\n", __func__);
 303
 304         if (dvb->frontend) {
 305                 cancel_work_sync(&dev->restart_streaming);
 306
 307                 mutex_lock(&dvb->lock);
 308                 dvb->stop_count++;
 309                 dprintk(1, "%s(), start_count: %d, stop_count: %d\n", __func__,
 310                         dvb->start_count, dvb->stop_count);
 311                 if (dvb->feeding > 0) {
 312                         dvb->feeding--;
 313                         if (dvb->feeding == 0) {
 314                                 /* Stop transport */
 315                                 ret = stop_urb_transfer(dev);
 316                                 au0828_stop_transport(dev, 0);
 317                         }
 318                 }
 319                 mutex_unlock(&dvb->lock);
 320         }
 321
 322         return ret;
 323 }
 324
 325 static void au0828_restart_dvb_streaming(struct work_struct *work)
 326 {
 327         struct au0828_dev *dev = container_of(work, struct au0828_dev,
 328                                               restart_streaming);
 329         struct au0828_dvb *dvb = &dev->dvb;
 330
 331         if (!dev->urb_streaming)
 332                 return;
 333
 334         dprintk(1, "Restarting streaming...!\n");
 335
 336         mutex_lock(&dvb->lock);
 337
 338         /* Stop transport */
 339         stop_urb_transfer(dev);
 340         au0828_stop_transport(dev, 1);
 341
 342         /* Start transport */
 343         au0828_start_transport(dev);
 344         start_urb_transfer(dev);
 345
 346         mutex_unlock(&dvb->lock);
 347 }
 348
 349 static int au0828_set_frontend(struct dvb_frontend *fe)
 350 {
 351         struct au0828_dev *dev = fe->dvb->priv;
 352         struct au0828_dvb *dvb = &dev->dvb;
 353         int ret, was_streaming;
 354
 355         mutex_lock(&dvb->lock);
 356         was_streaming = dev->urb_streaming;
 357         if (was_streaming) {
 358                 au0828_stop_transport(dev, 1);
 359
 360                 /*
 361                  * We can't hold a mutex here, as the restart_streaming
 362                  * kthread may also hold it.
 363                  */
 364                 mutex_unlock(&dvb->lock);
 365                 cancel_work_sync(&dev->restart_streaming);
 366                 mutex_lock(&dvb->lock);
 367
 368                 stop_urb_transfer(dev);
 369         }
 370         mutex_unlock(&dvb->lock);
 371
 372         ret = dvb->set_frontend(fe);
 373
 374         if (was_streaming) {
 375                 mutex_lock(&dvb->lock);
 376                 au0828_start_transport(dev);
 377                 start_urb_transfer(dev);
 378                 mutex_unlock(&dvb->lock);
 379         }
 380
 381         return ret;
 382 }
 383
 384 static int dvb_register(struct au0828_dev *dev)
 385 {
 386         struct au0828_dvb *dvb = &dev->dvb;
 387         int result;
 388
 389         dprintk(1, "%s()\n", __func__);
 390
 391         if (preallocate_big_buffers) {
 392                 int i;
 393                 for (i = 0; i < URB_COUNT; i++) {
 394                         dev->dig_transfer_buffer[i] = kzalloc(URB_BUFSIZE,
 395                                         GFP_KERNEL);
 396
 397                         if (!dev->dig_transfer_buffer[i]) {
 398                                 result = -ENOMEM;
 399
 400                                 pr_err("failed buffer allocation (errno = %d)\n",
 401                                        result);
 402                                 goto fail_adapter;
 403                         }
 404                 }
 405         }
 406
 407         INIT_WORK(&dev->restart_streaming, au0828_restart_dvb_streaming);
 408
 409         /* register adapter */
 410         result = dvb_register_adapter(&dvb->adapter,
 411                                       KBUILD_MODNAME, THIS_MODULE,
 412                                       &dev->usbdev->dev, adapter_nr);
 413         if (result < 0) {
 414                 pr_err("dvb_register_adapter failed (errno = %d)\n",
 415                        result);
 416                 goto fail_adapter;
 417         }
 418         dvb->adapter.priv = dev;
 419
 420         /* register frontend */
 421         result = dvb_register_frontend(&dvb->adapter, dvb->frontend);
 422         if (result < 0) {
 423                 pr_err("dvb_register_frontend failed (errno = %d)\n",
 424                        result);
 425                 goto fail_frontend;
 426         }
 427
 428         /* Hook dvb frontend */
 429         dvb->set_frontend = dvb->frontend->ops.set_frontend;
 430         dvb->frontend->ops.set_frontend = au0828_set_frontend;
 431
 432         /* register demux stuff */
 433         dvb->demux.dmx.capabilities =
 434                 DMX_TS_FILTERING | DMX_SECTION_FILTERING |
 435                 DMX_MEMORY_BASED_FILTERING;
 436         dvb->demux.priv       = dev;
 437         dvb->demux.filternum  = 256;
 438         dvb->demux.feednum    = 256;
 439         dvb->demux.start_feed = au0828_dvb_start_feed;
 440         dvb->demux.stop_feed  = au0828_dvb_stop_feed;
 441         result = dvb_dmx_init(&dvb->demux);
 442         if (result < 0) {
 443                 pr_err("dvb_dmx_init failed (errno = %d)\n", result);
 444                 goto fail_dmx;
 445         }
 446
 447         dvb->dmxdev.filternum    = 256;
 448         dvb->dmxdev.demux        = &dvb->demux.dmx;
 449         dvb->dmxdev.capabilities = 0;
 450         result = dvb_dmxdev_init(&dvb->dmxdev, &dvb->adapter);
 451         if (result < 0) {
 452                 pr_err("dvb_dmxdev_init failed (errno = %d)\n", result);
 453                 goto fail_dmxdev;
 454         }
 455
 456         dvb->fe_hw.source = DMX_FRONTEND_0;
 457         result = dvb->demux.dmx.add_frontend(&dvb->demux.dmx, &dvb->fe_hw);
 458         if (result < 0) {
 459                 pr_err("add_frontend failed (DMX_FRONTEND_0, errno = %d)\n",
 460                        result);
 461                 goto fail_fe_hw;
 462         }
 463
 464         dvb->fe_mem.source = DMX_MEMORY_FE;
 465         result = dvb->demux.dmx.add_frontend(&dvb->demux.dmx, &dvb->fe_mem);
 466         if (result < 0) {
 467                 pr_err("add_frontend failed (DMX_MEMORY_FE, errno = %d)\n",
 468                        result);
 469                 goto fail_fe_mem;
 470         }
 471
 472         result = dvb->demux.dmx.connect_frontend(&dvb->demux.dmx, &dvb->fe_hw);
 473         if (result < 0) {
 474                 pr_err("connect_frontend failed (errno = %d)\n", result);
 475                 goto fail_fe_conn;
 476         }
 477
 478         /* register network adapter */
 479         dvb_net_init(&dvb->adapter, &dvb->net, &dvb->demux.dmx);
 480
 481         dvb->start_count = 0;
 482         dvb->stop_count = 0;
 483         return 0;
 484
 485 fail_fe_conn:
 486         dvb->demux.dmx.remove_frontend(&dvb->demux.dmx, &dvb->fe_mem);
 487 fail_fe_mem:
 488         dvb->demux.dmx.remove_frontend(&dvb->demux.dmx, &dvb->fe_hw);
 489 fail_fe_hw:
 490         dvb_dmxdev_release(&dvb->dmxdev);
 491 fail_dmxdev:
 492         dvb_dmx_release(&dvb->demux);
 493 fail_dmx:
 494         dvb_unregister_frontend(dvb->frontend);
 495 fail_frontend:
 496         dvb_frontend_detach(dvb->frontend);
 497         dvb_unregister_adapter(&dvb->adapter);
 498 fail_adapter:
 499
 500         if (preallocate_big_buffers) {
 501                 int i;
 502                 for (i = 0; i < URB_COUNT; i++)
 503                         kfree(dev->dig_transfer_buffer[i]);
 504         }
 505
 506         return result;
 507 }
 508
 509 void au0828_dvb_unregister(struct au0828_dev *dev)
 510 {
 511         struct au0828_dvb *dvb = &dev->dvb;
 512
 513         dprintk(1, "%s()\n", __func__);
 514
 515         if (dvb->frontend == NULL)
 516                 return;
 517
 518         cancel_work_sync(&dev->restart_streaming);
 519
 520         dvb_net_release(&dvb->net);
 521         dvb->demux.dmx.remove_frontend(&dvb->demux.dmx, &dvb->fe_mem);
 522         dvb->demux.dmx.remove_frontend(&dvb->demux.dmx, &dvb->fe_hw);
 523         dvb_dmxdev_release(&dvb->dmxdev);
 524         dvb_dmx_release(&dvb->demux);
 525         dvb_unregister_frontend(dvb->frontend);
 526         dvb_frontend_detach(dvb->frontend);
 527         dvb_unregister_adapter(&dvb->adapter);
 528
 529         if (preallocate_big_buffers) {
 530                 int i;
 531                 for (i = 0; i < URB_COUNT; i++)
 532                         kfree(dev->dig_transfer_buffer[i]);
 533         }
 534         dvb->frontend = NULL;
 535 }
 536
 537 /* All the DVB attach calls go here, this function get's modified
 538  * for each new card. No other function in this file needs
 539  * to change.
 540  */
 541 int au0828_dvb_register(struct au0828_dev *dev)
 542 {
 543         struct au0828_dvb *dvb = &dev->dvb;
 544         int ret;
 545
 546         dprintk(1, "%s()\n", __func__);
 547
 548         /* init frontend */
 549         switch (dev->boardnr) {
 550         case AU0828_BOARD_HAUPPAUGE_HVR850:
 551         case AU0828_BOARD_HAUPPAUGE_HVR950Q:
 552                 dvb->frontend = dvb_attach(au8522_attach,
 553                                 &hauppauge_hvr950q_config,
 554                                 &dev->i2c_adap);
 555                 if (dvb->frontend != NULL)
 556                         switch (dev->board.tuner_type) {
 557                         default:
 558                         case TUNER_XC5000:
 559                                 dvb_attach(xc5000_attach, dvb->frontend,
 560                                            &dev->i2c_adap,
 561                                            &hauppauge_xc5000a_config);
 562                                 break;
 563                         case TUNER_XC5000C:
 564                                 dvb_attach(xc5000_attach, dvb->frontend,
 565                                            &dev->i2c_adap,
 566                                            &hauppauge_xc5000c_config);
 567                                 break;
 568                         }
 569                 break;
 570         case AU0828_BOARD_HAUPPAUGE_HVR950Q_MXL:
 571                 dvb->frontend = dvb_attach(au8522_attach,
 572                                 &hauppauge_hvr950q_config,
 573                                 &dev->i2c_adap);
 574                 if (dvb->frontend != NULL)
 575                         dvb_attach(mxl5007t_attach, dvb->frontend,
 576                                    &dev->i2c_adap, 0x60,
 577                                    &mxl5007t_hvr950q_config);
 578                 break;
 579         case AU0828_BOARD_HAUPPAUGE_WOODBURY:
 580                 dvb->frontend = dvb_attach(au8522_attach,
 581                                 &hauppauge_woodbury_config,
 582                                 &dev->i2c_adap);
 583                 if (dvb->frontend != NULL)
 584                         dvb_attach(tda18271_attach, dvb->frontend,
 585                                    0x60, &dev->i2c_adap,
 586                                    &hauppauge_woodbury_tunerconfig);
 587                 break;
 588         case AU0828_BOARD_DVICO_FUSIONHDTV7:
 589                 dvb->frontend = dvb_attach(au8522_attach,
 590                                 &fusionhdtv7usb_config,
 591                                 &dev->i2c_adap);
 592                 if (dvb->frontend != NULL) {
 593                         dvb_attach(xc5000_attach, dvb->frontend,
 594                                 &dev->i2c_adap,
 595                                 &hauppauge_xc5000a_config);
 596                 }
 597                 break;
 598         default:
 599                 pr_warn("The frontend of your DVB/ATSC card isn't supported yet\n");
 600                 break;
 601         }
 602         if (NULL == dvb->frontend) {
 603                 pr_err("%s() Frontend initialization failed\n",
 604                        __func__);
 605                 return -1;
 606         }
 607         /* define general-purpose callback pointer */
 608         dvb->frontend->callback = au0828_tuner_callback;
 609
 610         /* register everything */
 611         ret = dvb_register(dev);
 612         if (ret < 0) {
 613                 if (dvb->frontend->ops.release)
 614                         dvb->frontend->ops.release(dvb->frontend);
 615                 dvb->frontend = NULL;
 616                 return ret;
 617         }
 618
 619         return 0;
 620 }
 621
 622 void au0828_dvb_suspend(struct au0828_dev *dev)
 623 {
 624         struct au0828_dvb *dvb = &dev->dvb;
 625         int rc;
 626
 627         if (dvb->frontend) {
 628                 if (dev->urb_streaming) {
 629                         cancel_work_sync(&dev->restart_streaming);
 630                         /* Stop transport */
 631                         mutex_lock(&dvb->lock);
 632                         stop_urb_transfer(dev);
 633                         au0828_stop_transport(dev, 1);
 634                         mutex_unlock(&dvb->lock);
 635                         dev->need_urb_start = true;
 636                 }
 637                 /* suspend frontend - does tuner and fe to sleep */
 638                 rc = dvb_frontend_suspend(dvb->frontend);
 639                 pr_info("au0828_dvb_suspend(): Suspending DVB fe %d\n", rc);
 640         }
 641 }
 642
 643 void au0828_dvb_resume(struct au0828_dev *dev)
 644 {
 645         struct au0828_dvb *dvb = &dev->dvb;
 646         int rc;
 647
 648         if (dvb->frontend) {
 649                 /* resume frontend - does fe and tuner init */
 650                 rc = dvb_frontend_resume(dvb->frontend);
 651                 pr_info("au0828_dvb_resume(): Resuming DVB fe %d\n", rc);
 652                 if (dev->need_urb_start) {
 653                         /* Start transport */
 654                         mutex_lock(&dvb->lock);
 655                         au0828_start_transport(dev);
 656                         start_urb_transfer(dev);
 657                         mutex_unlock(&dvb->lock);
 658                 }
 659         }
 660 }