drivers/media/video/saa7164/saa7164-dvb.c

   1 /*
   2  *  Driver for the NXP SAA7164 PCIe bridge
   3  *
   4  *  Copyright (c) 2010 Steven Toth <stoth@kernellabs.com>
   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 "saa7164.h"
  23
  24 #include "tda10048.h"
  25 #include "tda18271.h"
  26 #include "s5h1411.h"
  27
  28 #define DRIVER_NAME "saa7164"
  29
  30 DVB_DEFINE_MOD_OPT_ADAPTER_NR(adapter_nr);
  31
  32 /* addr is in the card struct, get it from there */
  33 static struct tda10048_config hauppauge_hvr2200_1_config = {
  34         .demod_address    = 0x10 >> 1,
  35         .output_mode      = TDA10048_SERIAL_OUTPUT,
  36         .fwbulkwritelen   = TDA10048_BULKWRITE_200,
  37         .inversion        = TDA10048_INVERSION_ON,
  38         .dtv6_if_freq_khz = TDA10048_IF_3300,
  39         .dtv7_if_freq_khz = TDA10048_IF_3500,
  40         .dtv8_if_freq_khz = TDA10048_IF_4000,
  41         .clk_freq_khz     = TDA10048_CLK_16000,
  42 };
  43 static struct tda10048_config hauppauge_hvr2200_2_config = {
  44         .demod_address    = 0x12 >> 1,
  45         .output_mode      = TDA10048_SERIAL_OUTPUT,
  46         .fwbulkwritelen   = TDA10048_BULKWRITE_200,
  47         .inversion        = TDA10048_INVERSION_ON,
  48         .dtv6_if_freq_khz = TDA10048_IF_3300,
  49         .dtv7_if_freq_khz = TDA10048_IF_3500,
  50         .dtv8_if_freq_khz = TDA10048_IF_4000,
  51         .clk_freq_khz     = TDA10048_CLK_16000,
  52 };
  53
  54 static struct tda18271_std_map hauppauge_tda18271_std_map = {
  55         .atsc_6   = { .if_freq = 3250, .agc_mode = 3, .std = 3,
  56                       .if_lvl = 6, .rfagc_top = 0x37 },
  57         .qam_6    = { .if_freq = 4000, .agc_mode = 3, .std = 0,
  58                       .if_lvl = 6, .rfagc_top = 0x37 },
  59 };
  60
  61 static struct tda18271_config hauppauge_hvr22x0_tuner_config = {
  62         .std_map        = &hauppauge_tda18271_std_map,
  63         .gate           = TDA18271_GATE_ANALOG,
  64         .role           = TDA18271_MASTER,
  65 };
  66
  67 static struct tda18271_config hauppauge_hvr22x0s_tuner_config = {
  68         .std_map        = &hauppauge_tda18271_std_map,
  69         .gate           = TDA18271_GATE_ANALOG,
  70         .role           = TDA18271_SLAVE,
  71         .output_opt     = TDA18271_OUTPUT_LT_OFF,
  72         .rf_cal_on_startup = 1
  73 };
  74
  75 static struct s5h1411_config hauppauge_s5h1411_config = {
  76         .output_mode   = S5H1411_SERIAL_OUTPUT,
  77         .gpio          = S5H1411_GPIO_ON,
  78         .qam_if        = S5H1411_IF_4000,
  79         .vsb_if        = S5H1411_IF_3250,
  80         .inversion     = S5H1411_INVERSION_ON,
  81         .status_mode   = S5H1411_DEMODLOCKING,
  82         .mpeg_timing   = S5H1411_MPEGTIMING_CONTINOUS_NONINVERTING_CLOCK,
  83 };
  84
  85 static int saa7164_dvb_stop_port(struct saa7164_port *port)
  86 {
  87         struct saa7164_dev *dev = port->dev;
  88         int ret;
  89
  90         ret = saa7164_api_transition_port(port, SAA_DMASTATE_STOP);
  91         if ((ret != SAA_OK) && (ret != SAA_ERR_ALREADY_STOPPED)) {
  92                 printk(KERN_ERR "%s() stop transition failed, ret = 0x%x\n",
  93                         __func__, ret);
  94                 ret = -EIO;
  95         } else {
  96                 dprintk(DBGLVL_DVB, "%s()    Stopped\n", __func__);
  97                 ret = 0;
  98         }
  99
 100         return ret;
 101 }
 102
 103 static int saa7164_dvb_acquire_port(struct saa7164_port *port)
 104 {
 105         struct saa7164_dev *dev = port->dev;
 106         int ret;
 107
 108         ret = saa7164_api_transition_port(port, SAA_DMASTATE_ACQUIRE);
 109         if ((ret != SAA_OK) && (ret != SAA_ERR_ALREADY_STOPPED)) {
 110                 printk(KERN_ERR "%s() acquire transition failed, ret = 0x%x\n",
 111                         __func__, ret);
 112                 ret = -EIO;
 113         } else {
 114                 dprintk(DBGLVL_DVB, "%s() Acquired\n", __func__);
 115                 ret = 0;
 116         }
 117
 118         return ret;
 119 }
 120
 121 static int saa7164_dvb_pause_port(struct saa7164_port *port)
 122 {
 123         struct saa7164_dev *dev = port->dev;
 124         int ret;
 125
 126         ret = saa7164_api_transition_port(port, SAA_DMASTATE_PAUSE);
 127         if ((ret != SAA_OK) && (ret != SAA_ERR_ALREADY_STOPPED)) {
 128                 printk(KERN_ERR "%s() pause transition failed, ret = 0x%x\n",
 129                         __func__, ret);
 130                 ret = -EIO;
 131         } else {
 132                 dprintk(DBGLVL_DVB, "%s()   Paused\n", __func__);
 133                 ret = 0;
 134         }
 135
 136         return ret;
 137 }
 138
 139 /* Firmware is very windows centric, meaning you have to transition
 140  * the part through AVStream / KS Windows stages, forwards or backwards.
 141  * States are: stopped, acquired (h/w), paused, started.
 142  */
 143 static int saa7164_dvb_stop_streaming(struct saa7164_port *port)
 144 {
 145         struct saa7164_dev *dev = port->dev;
 146         struct saa7164_buffer *buf;
 147         struct list_head *p, *q;
 148         int ret;
 149
 150         dprintk(DBGLVL_DVB, "%s(port=%d)\n", __func__, port->nr);
 151
 152         ret = saa7164_dvb_pause_port(port);
 153         ret = saa7164_dvb_acquire_port(port);
 154         ret = saa7164_dvb_stop_port(port);
 155
 156         /* Mark the hardware buffers as free */
 157         mutex_lock(&port->dmaqueue_lock);
 158         list_for_each_safe(p, q, &port->dmaqueue.list) {
 159                 buf = list_entry(p, struct saa7164_buffer, list);
 160                 buf->flags = SAA7164_BUFFER_FREE;
 161         }
 162         mutex_unlock(&port->dmaqueue_lock);
 163
 164         return ret;
 165 }
 166
 167 static int saa7164_dvb_start_port(struct saa7164_port *port)
 168 {
 169         struct saa7164_dev *dev = port->dev;
 170         int ret = 0, result;
 171
 172         dprintk(DBGLVL_DVB, "%s(port=%d)\n", __func__, port->nr);
 173
 174         saa7164_buffer_cfg_port(port);
 175
 176         /* Acquire the hardware */
 177         result = saa7164_api_transition_port(port, SAA_DMASTATE_ACQUIRE);
 178         if ((result != SAA_OK) && (result != SAA_ERR_ALREADY_STOPPED)) {
 179                 printk(KERN_ERR "%s() acquire transition failed, res = 0x%x\n",
 180                         __func__, result);
 181
 182                 /* Stop the hardware, regardless */
 183                 result = saa7164_api_transition_port(port, SAA_DMASTATE_STOP);
 184                 if ((result != SAA_OK) && (result != SAA_ERR_ALREADY_STOPPED)) {
 185                         printk(KERN_ERR "%s() acquire/forced stop transition "
 186                                 "failed, res = 0x%x\n", __func__, result);
 187                 }
 188                 ret = -EIO;
 189                 goto out;
 190         } else
 191                 dprintk(DBGLVL_DVB, "%s()   Acquired\n", __func__);
 192
 193         /* Pause the hardware */
 194         result = saa7164_api_transition_port(port, SAA_DMASTATE_PAUSE);
 195         if ((result != SAA_OK) && (result != SAA_ERR_ALREADY_STOPPED)) {
 196                 printk(KERN_ERR "%s() pause transition failed, res = 0x%x\n",
 197                                 __func__, result);
 198
 199                 /* Stop the hardware, regardless */
 200                 result = saa7164_api_transition_port(port, SAA_DMASTATE_STOP);
 201                 if ((result != SAA_OK) && (result != SAA_ERR_ALREADY_STOPPED)) {
 202                         printk(KERN_ERR "%s() pause/forced stop transition "
 203                                 "failed, res = 0x%x\n", __func__, result);
 204                 }
 205
 206                 ret = -EIO;
 207                 goto out;
 208         } else
 209                 dprintk(DBGLVL_DVB, "%s()   Paused\n", __func__);
 210
 211         /* Start the hardware */
 212         result = saa7164_api_transition_port(port, SAA_DMASTATE_RUN);
 213         if ((result != SAA_OK) && (result != SAA_ERR_ALREADY_STOPPED)) {
 214                 printk(KERN_ERR "%s() run transition failed, result = 0x%x\n",
 215                                 __func__, result);
 216
 217                 /* Stop the hardware, regardless */
 218                 result = saa7164_api_transition_port(port, SAA_DMASTATE_STOP);
 219                 if ((result != SAA_OK) && (result != SAA_ERR_ALREADY_STOPPED)) {
 220                         printk(KERN_ERR "%s() run/forced stop transition "
 221                                 "failed, res = 0x%x\n", __func__, result);
 222                 }
 223
 224                 ret = -EIO;
 225         } else
 226                 dprintk(DBGLVL_DVB, "%s()   Running\n", __func__);
 227
 228 out:
 229         return ret;
 230 }
 231
 232 static int saa7164_dvb_start_feed(struct dvb_demux_feed *feed)
 233 {
 234         struct dvb_demux *demux = feed->demux;
 235         struct saa7164_port *port = (struct saa7164_port *) demux->priv;
 236         struct saa7164_dvb *dvb = &port->dvb;
 237         struct saa7164_dev *dev = port->dev;
 238         int ret = 0;
 239
 240         dprintk(DBGLVL_DVB, "%s(port=%d)\n", __func__, port->nr);
 241
 242         if (!demux->dmx.frontend)
 243                 return -EINVAL;
 244
 245         if (dvb) {
 246                 mutex_lock(&dvb->lock);
 247                 if (dvb->feeding++ == 0) {
 248                         /* Start transport */
 249                         ret = saa7164_dvb_start_port(port);
 250                 }
 251                 mutex_unlock(&dvb->lock);
 252                 dprintk(DBGLVL_DVB, "%s(port=%d) now feeding = %d\n",
 253                         __func__, port->nr, dvb->feeding);
 254         }
 255
 256         return ret;
 257 }
 258
 259 static int saa7164_dvb_stop_feed(struct dvb_demux_feed *feed)
 260 {
 261         struct dvb_demux *demux = feed->demux;
 262         struct saa7164_port *port = (struct saa7164_port *) demux->priv;
 263         struct saa7164_dvb *dvb = &port->dvb;
 264         struct saa7164_dev *dev = port->dev;
 265         int ret = 0;
 266
 267         dprintk(DBGLVL_DVB, "%s(port=%d)\n", __func__, port->nr);
 268
 269         if (dvb) {
 270                 mutex_lock(&dvb->lock);
 271                 if (--dvb->feeding == 0) {
 272                         /* Stop transport */
 273                         ret = saa7164_dvb_stop_streaming(port);
 274                 }
 275                 mutex_unlock(&dvb->lock);
 276                 dprintk(DBGLVL_DVB, "%s(port=%d) now feeding = %d\n",
 277                         __func__, port->nr, dvb->feeding);
 278         }
 279
 280         return ret;
 281 }
 282
 283 static int dvb_register(struct saa7164_port *port)
 284 {
 285         struct saa7164_dvb *dvb = &port->dvb;
 286         struct saa7164_dev *dev = port->dev;
 287         struct saa7164_buffer *buf;
 288         int result, i;
 289
 290         dprintk(DBGLVL_DVB, "%s(port=%d)\n", __func__, port->nr);
 291
 292         if (port->type != SAA7164_MPEG_DVB)
 293                 BUG();
 294
 295         /* Sanity check that the PCI configuration space is active */
 296         if (port->hwcfg.BARLocation == 0) {
 297                 result = -ENOMEM;
 298                 printk(KERN_ERR "%s: dvb_register_adapter failed "
 299                        "(errno = %d), NO PCI configuration\n",
 300                         DRIVER_NAME, result);
 301                 goto fail_adapter;
 302         }
 303
 304         /* Init and establish defaults */
 305         port->hw_streamingparams.bitspersample = 8;
 306         port->hw_streamingparams.samplesperline = 188;
 307         port->hw_streamingparams.numberoflines =
 308                 (SAA7164_TS_NUMBER_OF_LINES * 188) / 188;
 309
 310         port->hw_streamingparams.pitch = 188;
 311         port->hw_streamingparams.linethreshold = 0;
 312         port->hw_streamingparams.pagetablelistvirt = NULL;
 313         port->hw_streamingparams.pagetablelistphys = NULL;
 314         port->hw_streamingparams.numpagetables = 2 +
 315                 ((SAA7164_TS_NUMBER_OF_LINES * 188) / PAGE_SIZE);
 316
 317         port->hw_streamingparams.numpagetableentries = port->hwcfg.buffercount;
 318
 319         /* Allocate the PCI resources */
 320         for (i = 0; i < port->hwcfg.buffercount; i++) {
 321                 buf = saa7164_buffer_alloc(port,
 322                         port->hw_streamingparams.numberoflines *
 323                         port->hw_streamingparams.pitch);
 324
 325                 if (!buf) {
 326                         result = -ENOMEM;
 327                         printk(KERN_ERR "%s: dvb_register_adapter failed "
 328                                "(errno = %d), unable to allocate buffers\n",
 329                                 DRIVER_NAME, result);
 330                         goto fail_adapter;
 331                 }
 332
 333                 mutex_lock(&port->dmaqueue_lock);
 334                 list_add_tail(&buf->list, &port->dmaqueue.list);
 335                 mutex_unlock(&port->dmaqueue_lock);
 336         }
 337
 338         /* register adapter */
 339         result = dvb_register_adapter(&dvb->adapter, DRIVER_NAME, THIS_MODULE,
 340                         &dev->pci->dev, adapter_nr);
 341         if (result < 0) {
 342                 printk(KERN_ERR "%s: dvb_register_adapter failed "
 343                        "(errno = %d)\n", DRIVER_NAME, result);
 344                 goto fail_adapter;
 345         }
 346         dvb->adapter.priv = port;
 347
 348         /* register frontend */
 349         result = dvb_register_frontend(&dvb->adapter, dvb->frontend);
 350         if (result < 0) {
 351                 printk(KERN_ERR "%s: dvb_register_frontend failed "
 352                        "(errno = %d)\n", DRIVER_NAME, result);
 353                 goto fail_frontend;
 354         }
 355
 356         /* register demux stuff */
 357         dvb->demux.dmx.capabilities =
 358                 DMX_TS_FILTERING | DMX_SECTION_FILTERING |
 359                 DMX_MEMORY_BASED_FILTERING;
 360         dvb->demux.priv       = port;
 361         dvb->demux.filternum  = 256;
 362         dvb->demux.feednum    = 256;
 363         dvb->demux.start_feed = saa7164_dvb_start_feed;
 364         dvb->demux.stop_feed  = saa7164_dvb_stop_feed;
 365         result = dvb_dmx_init(&dvb->demux);
 366         if (result < 0) {
 367                 printk(KERN_ERR "%s: dvb_dmx_init failed (errno = %d)\n",
 368                        DRIVER_NAME, result);
 369                 goto fail_dmx;
 370         }
 371
 372         dvb->dmxdev.filternum    = 256;
 373         dvb->dmxdev.demux        = &dvb->demux.dmx;
 374         dvb->dmxdev.capabilities = 0;
 375         result = dvb_dmxdev_init(&dvb->dmxdev, &dvb->adapter);
 376         if (result < 0) {
 377                 printk(KERN_ERR "%s: dvb_dmxdev_init failed (errno = %d)\n",
 378                        DRIVER_NAME, result);
 379                 goto fail_dmxdev;
 380         }
 381
 382         dvb->fe_hw.source = DMX_FRONTEND_0;
 383         result = dvb->demux.dmx.add_frontend(&dvb->demux.dmx, &dvb->fe_hw);
 384         if (result < 0) {
 385                 printk(KERN_ERR "%s: add_frontend failed "
 386                        "(DMX_FRONTEND_0, errno = %d)\n", DRIVER_NAME, result);
 387                 goto fail_fe_hw;
 388         }
 389
 390         dvb->fe_mem.source = DMX_MEMORY_FE;
 391         result = dvb->demux.dmx.add_frontend(&dvb->demux.dmx, &dvb->fe_mem);
 392         if (result < 0) {
 393                 printk(KERN_ERR "%s: add_frontend failed "
 394                        "(DMX_MEMORY_FE, errno = %d)\n", DRIVER_NAME, result);
 395                 goto fail_fe_mem;
 396         }
 397
 398         result = dvb->demux.dmx.connect_frontend(&dvb->demux.dmx, &dvb->fe_hw);
 399         if (result < 0) {
 400                 printk(KERN_ERR "%s: connect_frontend failed (errno = %d)\n",
 401                        DRIVER_NAME, result);
 402                 goto fail_fe_conn;
 403         }
 404
 405         /* register network adapter */
 406         dvb_net_init(&dvb->adapter, &dvb->net, &dvb->demux.dmx);
 407         return 0;
 408
 409 fail_fe_conn:
 410         dvb->demux.dmx.remove_frontend(&dvb->demux.dmx, &dvb->fe_mem);
 411 fail_fe_mem:
 412         dvb->demux.dmx.remove_frontend(&dvb->demux.dmx, &dvb->fe_hw);
 413 fail_fe_hw:
 414         dvb_dmxdev_release(&dvb->dmxdev);
 415 fail_dmxdev:
 416         dvb_dmx_release(&dvb->demux);
 417 fail_dmx:
 418         dvb_unregister_frontend(dvb->frontend);
 419 fail_frontend:
 420         dvb_frontend_detach(dvb->frontend);
 421         dvb_unregister_adapter(&dvb->adapter);
 422 fail_adapter:
 423         return result;
 424 }
 425
 426 int saa7164_dvb_unregister(struct saa7164_port *port)
 427 {
 428         struct saa7164_dvb *dvb = &port->dvb;
 429         struct saa7164_dev *dev = port->dev;
 430         struct saa7164_buffer *b;
 431         struct list_head *c, *n;
 432
 433         dprintk(DBGLVL_DVB, "%s()\n", __func__);
 434
 435         if (port->type != SAA7164_MPEG_DVB)
 436                 BUG();
 437
 438         /* Remove any allocated buffers */
 439         mutex_lock(&port->dmaqueue_lock);
 440         list_for_each_safe(c, n, &port->dmaqueue.list) {
 441                 b = list_entry(c, struct saa7164_buffer, list);
 442                 list_del(c);
 443                 saa7164_buffer_dealloc(b);
 444         }
 445         mutex_unlock(&port->dmaqueue_lock);
 446
 447         if (dvb->frontend == NULL)
 448                 return 0;
 449
 450         dvb_net_release(&dvb->net);
 451         dvb->demux.dmx.remove_frontend(&dvb->demux.dmx, &dvb->fe_mem);
 452         dvb->demux.dmx.remove_frontend(&dvb->demux.dmx, &dvb->fe_hw);
 453         dvb_dmxdev_release(&dvb->dmxdev);
 454         dvb_dmx_release(&dvb->demux);
 455         dvb_unregister_frontend(dvb->frontend);
 456         dvb_frontend_detach(dvb->frontend);
 457         dvb_unregister_adapter(&dvb->adapter);
 458         return 0;
 459 }
 460
 461 /* All the DVB attach calls go here, this function get's modified
 462  * for each new card.
 463  */
 464 int saa7164_dvb_register(struct saa7164_port *port)
 465 {
 466         struct saa7164_dev *dev = port->dev;
 467         struct saa7164_dvb *dvb = &port->dvb;
 468         struct saa7164_i2c *i2c_bus = NULL;
 469         int ret;
 470
 471         dprintk(DBGLVL_DVB, "%s()\n", __func__);
 472
 473         /* init frontend */
 474         switch (dev->board) {
 475         case SAA7164_BOARD_HAUPPAUGE_HVR2200:
 476         case SAA7164_BOARD_HAUPPAUGE_HVR2200_2:
 477         case SAA7164_BOARD_HAUPPAUGE_HVR2200_3:
 478         case SAA7164_BOARD_HAUPPAUGE_HVR2200_4:
 479         case SAA7164_BOARD_HAUPPAUGE_HVR2200_5:
 480                 i2c_bus = &dev->i2c_bus[port->nr + 1];
 481                 switch (port->nr) {
 482                 case 0:
 483                         port->dvb.frontend = dvb_attach(tda10048_attach,
 484                                 &hauppauge_hvr2200_1_config,
 485                                 &i2c_bus->i2c_adap);
 486
 487                         if (port->dvb.frontend != NULL) {
 488                                 /* TODO: addr is in the card struct */
 489                                 dvb_attach(tda18271_attach, port->dvb.frontend,
 490                                         0xc0 >> 1, &i2c_bus->i2c_adap,
 491                                         &hauppauge_hvr22x0_tuner_config);
 492                         }
 493
 494                         break;
 495                 case 1:
 496                         port->dvb.frontend = dvb_attach(tda10048_attach,
 497                                 &hauppauge_hvr2200_2_config,
 498                                 &i2c_bus->i2c_adap);
 499
 500                         if (port->dvb.frontend != NULL) {
 501                                 /* TODO: addr is in the card struct */
 502                                 dvb_attach(tda18271_attach, port->dvb.frontend,
 503                                         0xc0 >> 1, &i2c_bus->i2c_adap,
 504                                         &hauppauge_hvr22x0s_tuner_config);
 505                         }
 506
 507                         break;
 508                 }
 509                 break;
 510         case SAA7164_BOARD_HAUPPAUGE_HVR2250:
 511         case SAA7164_BOARD_HAUPPAUGE_HVR2250_2:
 512         case SAA7164_BOARD_HAUPPAUGE_HVR2250_3:
 513                 i2c_bus = &dev->i2c_bus[port->nr + 1];
 514
 515                 port->dvb.frontend = dvb_attach(s5h1411_attach,
 516                         &hauppauge_s5h1411_config,
 517                         &i2c_bus->i2c_adap);
 518
 519                 if (port->dvb.frontend != NULL) {
 520                         if (port->nr == 0) {
 521                                 /* Master TDA18271 */
 522                                 /* TODO: addr is in the card struct */
 523                                 dvb_attach(tda18271_attach, port->dvb.frontend,
 524                                         0xc0 >> 1, &i2c_bus->i2c_adap,
 525                                         &hauppauge_hvr22x0_tuner_config);
 526                         } else {
 527                                 /* Slave TDA18271 */
 528                                 dvb_attach(tda18271_attach, port->dvb.frontend,
 529                                         0xc0 >> 1, &i2c_bus->i2c_adap,
 530                                         &hauppauge_hvr22x0s_tuner_config);
 531                         }
 532                 }
 533
 534                 break;
 535         default:
 536                 printk(KERN_ERR "%s: The frontend isn't supported\n",
 537                        dev->name);
 538                 break;
 539         }
 540         if (NULL == dvb->frontend) {
 541                 printk(KERN_ERR "%s() Frontend initialization failed\n",
 542                        __func__);
 543                 return -1;
 544         }
 545
 546         /* register everything */
 547         ret = dvb_register(port);
 548         if (ret < 0) {
 549                 if (dvb->frontend->ops.release)
 550                         dvb->frontend->ops.release(dvb->frontend);
 551                 return ret;
 552         }
 553
 554         return 0;
 555 }
 556