LXR linux/drivers/media/common/siano/smsdvb-debugfs.c

   1// SPDX-License-Identifier: GPL-2.0+
   2//
   3// Copyright(c) 2013 Mauro Carvalho Chehab
   4
   5#include "smscoreapi.h"
   6
   7#include <linux/module.h>
   8#include <linux/slab.h>
   9#include <linux/init.h>
  10#include <linux/debugfs.h>
  11#include <linux/spinlock.h>
  12#include <linux/usb.h>
  13
  14#include <media/dmxdev.h>
  15#include <media/dvbdev.h>
  16#include <media/dvb_demux.h>
  17#include <media/dvb_frontend.h>
  18
  19#include "smsdvb.h"
  20
  21static struct dentry *smsdvb_debugfs_usb_root;
  22
  23struct smsdvb_debugfs {
  24        struct kref             refcount;
  25        spinlock_t              lock;
  26
  27        char                    stats_data[PAGE_SIZE];
  28        unsigned                stats_count;
  29        bool                    stats_was_read;
  30
  31        wait_queue_head_t       stats_queue;
  32};
  33
  34static void smsdvb_print_dvb_stats(struct smsdvb_debugfs *debug_data,
  35                            struct sms_stats *p)
  36{
  37        int n = 0;
  38        char *buf;
  39
  40        spin_lock(&debug_data->lock);
  41        if (debug_data->stats_count) {
  42                spin_unlock(&debug_data->lock);
  43                return;
  44        }
  45
  46        buf = debug_data->stats_data;
  47
  48        n += snprintf(&buf[n], PAGE_SIZE - n,
  49                      "is_rf_locked = %d\n", p->is_rf_locked);
  50        n += snprintf(&buf[n], PAGE_SIZE - n,
  51                      "is_demod_locked = %d\n", p->is_demod_locked);
  52        n += snprintf(&buf[n], PAGE_SIZE - n,
  53                      "is_external_lna_on = %d\n", p->is_external_lna_on);
  54        n += snprintf(&buf[n], PAGE_SIZE - n,
  55                      "SNR = %d\n", p->SNR);
  56        n += snprintf(&buf[n], PAGE_SIZE - n,
  57                      "ber = %d\n", p->ber);
  58        n += snprintf(&buf[n], PAGE_SIZE - n,
  59                      "FIB_CRC = %d\n", p->FIB_CRC);
  60        n += snprintf(&buf[n], PAGE_SIZE - n,
  61                      "ts_per = %d\n", p->ts_per);
  62        n += snprintf(&buf[n], PAGE_SIZE - n,
  63                      "MFER = %d\n", p->MFER);
  64        n += snprintf(&buf[n], PAGE_SIZE - n,
  65                      "RSSI = %d\n", p->RSSI);
  66        n += snprintf(&buf[n], PAGE_SIZE - n,
  67                      "in_band_pwr = %d\n", p->in_band_pwr);
  68        n += snprintf(&buf[n], PAGE_SIZE - n,
  69                      "carrier_offset = %d\n", p->carrier_offset);
  70        n += snprintf(&buf[n], PAGE_SIZE - n,
  71                      "modem_state = %d\n", p->modem_state);
  72        n += snprintf(&buf[n], PAGE_SIZE - n,
  73                      "frequency = %d\n", p->frequency);
  74        n += snprintf(&buf[n], PAGE_SIZE - n,
  75                      "bandwidth = %d\n", p->bandwidth);
  76        n += snprintf(&buf[n], PAGE_SIZE - n,
  77                      "transmission_mode = %d\n", p->transmission_mode);
  78        n += snprintf(&buf[n], PAGE_SIZE - n,
  79                      "modem_state = %d\n", p->modem_state);
  80        n += snprintf(&buf[n], PAGE_SIZE - n,
  81                      "guard_interval = %d\n", p->guard_interval);
  82        n += snprintf(&buf[n], PAGE_SIZE - n,
  83                      "code_rate = %d\n", p->code_rate);
  84        n += snprintf(&buf[n], PAGE_SIZE - n,
  85                      "lp_code_rate = %d\n", p->lp_code_rate);
  86        n += snprintf(&buf[n], PAGE_SIZE - n,
  87                      "hierarchy = %d\n", p->hierarchy);
  88        n += snprintf(&buf[n], PAGE_SIZE - n,
  89                      "constellation = %d\n", p->constellation);
  90        n += snprintf(&buf[n], PAGE_SIZE - n,
  91                      "burst_size = %d\n", p->burst_size);
  92        n += snprintf(&buf[n], PAGE_SIZE - n,
  93                      "burst_duration = %d\n", p->burst_duration);
  94        n += snprintf(&buf[n], PAGE_SIZE - n,
  95                      "burst_cycle_time = %d\n", p->burst_cycle_time);
  96        n += snprintf(&buf[n], PAGE_SIZE - n,
  97                      "calc_burst_cycle_time = %d\n",
  98                      p->calc_burst_cycle_time);
  99        n += snprintf(&buf[n], PAGE_SIZE - n,
 100                      "num_of_rows = %d\n", p->num_of_rows);
 101        n += snprintf(&buf[n], PAGE_SIZE - n,
 102                      "num_of_padd_cols = %d\n", p->num_of_padd_cols);
 103        n += snprintf(&buf[n], PAGE_SIZE - n,
 104                      "num_of_punct_cols = %d\n", p->num_of_punct_cols);
 105        n += snprintf(&buf[n], PAGE_SIZE - n,
 106                      "error_ts_packets = %d\n", p->error_ts_packets);
 107        n += snprintf(&buf[n], PAGE_SIZE - n,
 108                      "total_ts_packets = %d\n", p->total_ts_packets);
 109        n += snprintf(&buf[n], PAGE_SIZE - n,
 110                      "num_of_valid_mpe_tlbs = %d\n", p->num_of_valid_mpe_tlbs);
 111        n += snprintf(&buf[n], PAGE_SIZE - n,
 112                      "num_of_invalid_mpe_tlbs = %d\n", p->num_of_invalid_mpe_tlbs);
 113        n += snprintf(&buf[n], PAGE_SIZE - n,
 114                      "num_of_corrected_mpe_tlbs = %d\n", p->num_of_corrected_mpe_tlbs);
 115        n += snprintf(&buf[n], PAGE_SIZE - n,
 116                      "ber_error_count = %d\n", p->ber_error_count);
 117        n += snprintf(&buf[n], PAGE_SIZE - n,
 118                      "ber_bit_count = %d\n", p->ber_bit_count);
 119        n += snprintf(&buf[n], PAGE_SIZE - n,
 120                      "sms_to_host_tx_errors = %d\n", p->sms_to_host_tx_errors);
 121        n += snprintf(&buf[n], PAGE_SIZE - n,
 122                      "pre_ber = %d\n", p->pre_ber);
 123        n += snprintf(&buf[n], PAGE_SIZE - n,
 124                      "cell_id = %d\n", p->cell_id);
 125        n += snprintf(&buf[n], PAGE_SIZE - n,
 126                      "dvbh_srv_ind_hp = %d\n", p->dvbh_srv_ind_hp);
 127        n += snprintf(&buf[n], PAGE_SIZE - n,
 128                      "dvbh_srv_ind_lp = %d\n", p->dvbh_srv_ind_lp);
 129        n += snprintf(&buf[n], PAGE_SIZE - n,
 130                      "num_mpe_received = %d\n", p->num_mpe_received);
 131
 132        debug_data->stats_count = n;
 133        spin_unlock(&debug_data->lock);
 134        wake_up(&debug_data->stats_queue);
 135}
 136
 137static void smsdvb_print_isdb_stats(struct smsdvb_debugfs *debug_data,
 138                             struct sms_isdbt_stats *p)
 139{
 140        int i, n = 0;
 141        char *buf;
 142
 143        spin_lock(&debug_data->lock);
 144        if (debug_data->stats_count) {
 145                spin_unlock(&debug_data->lock);
 146                return;
 147        }
 148
 149        buf = debug_data->stats_data;
 150
 151        n += snprintf(&buf[n], PAGE_SIZE - n,
 152                      "statistics_type = %d\t", p->statistics_type);
 153        n += snprintf(&buf[n], PAGE_SIZE - n,
 154                      "full_size = %d\n", p->full_size);
 155
 156        n += snprintf(&buf[n], PAGE_SIZE - n,
 157                      "is_rf_locked = %d\t\t", p->is_rf_locked);
 158        n += snprintf(&buf[n], PAGE_SIZE - n,
 159                      "is_demod_locked = %d\t", p->is_demod_locked);
 160        n += snprintf(&buf[n], PAGE_SIZE - n,
 161                      "is_external_lna_on = %d\n", p->is_external_lna_on);
 162        n += snprintf(&buf[n], PAGE_SIZE - n,
 163                      "SNR = %d dB\t\t", p->SNR);
 164        n += snprintf(&buf[n], PAGE_SIZE - n,
 165                      "RSSI = %d dBm\t\t", p->RSSI);
 166        n += snprintf(&buf[n], PAGE_SIZE - n,
 167                      "in_band_pwr = %d dBm\n", p->in_band_pwr);
 168        n += snprintf(&buf[n], PAGE_SIZE - n,
 169                      "carrier_offset = %d\t", p->carrier_offset);
 170        n += snprintf(&buf[n], PAGE_SIZE - n,
 171                      "bandwidth = %d\t\t", p->bandwidth);
 172        n += snprintf(&buf[n], PAGE_SIZE - n,
 173                      "frequency = %d Hz\n", p->frequency);
 174        n += snprintf(&buf[n], PAGE_SIZE - n,
 175                      "transmission_mode = %d\t", p->transmission_mode);
 176        n += snprintf(&buf[n], PAGE_SIZE - n,
 177                      "modem_state = %d\t\t", p->modem_state);
 178        n += snprintf(&buf[n], PAGE_SIZE - n,
 179                      "guard_interval = %d\n", p->guard_interval);
 180        n += snprintf(&buf[n], PAGE_SIZE - n,
 181                      "system_type = %d\t\t", p->system_type);
 182        n += snprintf(&buf[n], PAGE_SIZE - n,
 183                      "partial_reception = %d\t", p->partial_reception);
 184        n += snprintf(&buf[n], PAGE_SIZE - n,
 185                      "num_of_layers = %d\n", p->num_of_layers);
 186        n += snprintf(&buf[n], PAGE_SIZE - n,
 187                      "sms_to_host_tx_errors = %d\n", p->sms_to_host_tx_errors);
 188
 189        for (i = 0; i < 3; i++) {
 190                if (p->layer_info[i].number_of_segments < 1 ||
 191                    p->layer_info[i].number_of_segments > 13)
 192                        continue;
 193
 194                n += snprintf(&buf[n], PAGE_SIZE - n, "\nLayer %d\n", i);
 195                n += snprintf(&buf[n], PAGE_SIZE - n, "\tcode_rate = %d\t",
 196                              p->layer_info[i].code_rate);
 197                n += snprintf(&buf[n], PAGE_SIZE - n, "constellation = %d\n",
 198                              p->layer_info[i].constellation);
 199                n += snprintf(&buf[n], PAGE_SIZE - n, "\tber = %-5d\t",
 200                              p->layer_info[i].ber);
 201                n += snprintf(&buf[n], PAGE_SIZE - n, "\tber_error_count = %-5d\t",
 202                              p->layer_info[i].ber_error_count);
 203                n += snprintf(&buf[n], PAGE_SIZE - n, "ber_bit_count = %-5d\n",
 204                              p->layer_info[i].ber_bit_count);
 205                n += snprintf(&buf[n], PAGE_SIZE - n, "\tpre_ber = %-5d\t",
 206                              p->layer_info[i].pre_ber);
 207                n += snprintf(&buf[n], PAGE_SIZE - n, "\tts_per = %-5d\n",
 208                              p->layer_info[i].ts_per);
 209                n += snprintf(&buf[n], PAGE_SIZE - n, "\terror_ts_packets = %-5d\t",
 210                              p->layer_info[i].error_ts_packets);
 211                n += snprintf(&buf[n], PAGE_SIZE - n, "total_ts_packets = %-5d\t",
 212                              p->layer_info[i].total_ts_packets);
 213                n += snprintf(&buf[n], PAGE_SIZE - n, "ti_ldepth_i = %d\n",
 214                              p->layer_info[i].ti_ldepth_i);
 215                n += snprintf(&buf[n], PAGE_SIZE - n,
 216                              "\tnumber_of_segments = %d\t",
 217                              p->layer_info[i].number_of_segments);
 218                n += snprintf(&buf[n], PAGE_SIZE - n, "tmcc_errors = %d\n",
 219                              p->layer_info[i].tmcc_errors);
 220        }
 221
 222        debug_data->stats_count = n;
 223        spin_unlock(&debug_data->lock);
 224        wake_up(&debug_data->stats_queue);
 225}
 226
 227static void smsdvb_print_isdb_stats_ex(struct smsdvb_debugfs *debug_data,
 228                                struct sms_isdbt_stats_ex *p)
 229{
 230        int i, n = 0;
 231        char *buf;
 232
 233        spin_lock(&debug_data->lock);
 234        if (debug_data->stats_count) {
 235                spin_unlock(&debug_data->lock);
 236                return;
 237        }
 238
 239        buf = debug_data->stats_data;
 240
 241        n += snprintf(&buf[n], PAGE_SIZE - n,
 242                      "statistics_type = %d\t", p->statistics_type);
 243        n += snprintf(&buf[n], PAGE_SIZE - n,
 244                      "full_size = %d\n", p->full_size);
 245
 246        n += snprintf(&buf[n], PAGE_SIZE - n,
 247                      "is_rf_locked = %d\t\t", p->is_rf_locked);
 248        n += snprintf(&buf[n], PAGE_SIZE - n,
 249                      "is_demod_locked = %d\t", p->is_demod_locked);
 250        n += snprintf(&buf[n], PAGE_SIZE - n,
 251                      "is_external_lna_on = %d\n", p->is_external_lna_on);
 252        n += snprintf(&buf[n], PAGE_SIZE - n,
 253                      "SNR = %d dB\t\t", p->SNR);
 254        n += snprintf(&buf[n], PAGE_SIZE - n,
 255                      "RSSI = %d dBm\t\t", p->RSSI);
 256        n += snprintf(&buf[n], PAGE_SIZE - n,
 257                      "in_band_pwr = %d dBm\n", p->in_band_pwr);
 258        n += snprintf(&buf[n], PAGE_SIZE - n,
 259                      "carrier_offset = %d\t", p->carrier_offset);
 260        n += snprintf(&buf[n], PAGE_SIZE - n,
 261                      "bandwidth = %d\t\t", p->bandwidth);
 262        n += snprintf(&buf[n], PAGE_SIZE - n,
 263                      "frequency = %d Hz\n", p->frequency);
 264        n += snprintf(&buf[n], PAGE_SIZE - n,
 265                      "transmission_mode = %d\t", p->transmission_mode);
 266        n += snprintf(&buf[n], PAGE_SIZE - n,
 267                      "modem_state = %d\t\t", p->modem_state);
 268        n += snprintf(&buf[n], PAGE_SIZE - n,
 269                      "guard_interval = %d\n", p->guard_interval);
 270        n += snprintf(&buf[n], PAGE_SIZE - n,
 271                      "system_type = %d\t\t", p->system_type);
 272        n += snprintf(&buf[n], PAGE_SIZE - n,
 273                      "partial_reception = %d\t", p->partial_reception);
 274        n += snprintf(&buf[n], PAGE_SIZE - n,
 275                      "num_of_layers = %d\n", p->num_of_layers);
 276        n += snprintf(&buf[n], PAGE_SIZE - n, "segment_number = %d\t",
 277                      p->segment_number);
 278        n += snprintf(&buf[n], PAGE_SIZE - n, "tune_bw = %d\n",
 279                      p->tune_bw);
 280
 281        for (i = 0; i < 3; i++) {
 282                if (p->layer_info[i].number_of_segments < 1 ||
 283                    p->layer_info[i].number_of_segments > 13)
 284                        continue;
 285
 286                n += snprintf(&buf[n], PAGE_SIZE - n, "\nLayer %d\n", i);
 287                n += snprintf(&buf[n], PAGE_SIZE - n, "\tcode_rate = %d\t",
 288                              p->layer_info[i].code_rate);
 289                n += snprintf(&buf[n], PAGE_SIZE - n, "constellation = %d\n",
 290                              p->layer_info[i].constellation);
 291                n += snprintf(&buf[n], PAGE_SIZE - n, "\tber = %-5d\t",
 292                              p->layer_info[i].ber);
 293                n += snprintf(&buf[n], PAGE_SIZE - n, "\tber_error_count = %-5d\t",
 294                              p->layer_info[i].ber_error_count);
 295                n += snprintf(&buf[n], PAGE_SIZE - n, "ber_bit_count = %-5d\n",
 296                              p->layer_info[i].ber_bit_count);
 297                n += snprintf(&buf[n], PAGE_SIZE - n, "\tpre_ber = %-5d\t",
 298                              p->layer_info[i].pre_ber);
 299                n += snprintf(&buf[n], PAGE_SIZE - n, "\tts_per = %-5d\n",
 300                              p->layer_info[i].ts_per);
 301                n += snprintf(&buf[n], PAGE_SIZE - n, "\terror_ts_packets = %-5d\t",
 302                              p->layer_info[i].error_ts_packets);
 303                n += snprintf(&buf[n], PAGE_SIZE - n, "total_ts_packets = %-5d\t",
 304                              p->layer_info[i].total_ts_packets);
 305                n += snprintf(&buf[n], PAGE_SIZE - n, "ti_ldepth_i = %d\n",
 306                              p->layer_info[i].ti_ldepth_i);
 307                n += snprintf(&buf[n], PAGE_SIZE - n,
 308                              "\tnumber_of_segments = %d\t",
 309                              p->layer_info[i].number_of_segments);
 310                n += snprintf(&buf[n], PAGE_SIZE - n, "tmcc_errors = %d\n",
 311                              p->layer_info[i].tmcc_errors);
 312        }
 313
 314
 315        debug_data->stats_count = n;
 316        spin_unlock(&debug_data->lock);
 317
 318        wake_up(&debug_data->stats_queue);
 319}
 320
 321static int smsdvb_stats_open(struct inode *inode, struct file *file)
 322{
 323        struct smsdvb_client_t *client = inode->i_private;
 324        struct smsdvb_debugfs *debug_data = client->debug_data;
 325
 326        kref_get(&debug_data->refcount);
 327
 328        spin_lock(&debug_data->lock);
 329        debug_data->stats_count = 0;
 330        debug_data->stats_was_read = false;
 331        spin_unlock(&debug_data->lock);
 332
 333        file->private_data = debug_data;
 334
 335        return 0;
 336}
 337
 338static void smsdvb_debugfs_data_release(struct kref *ref)
 339{
 340        struct smsdvb_debugfs *debug_data;
 341
 342        debug_data = container_of(ref, struct smsdvb_debugfs, refcount);
 343        kfree(debug_data);
 344}
 345
 346static int smsdvb_stats_wait_read(struct smsdvb_debugfs *debug_data)
 347{
 348        int rc = 1;
 349
 350        spin_lock(&debug_data->lock);
 351
 352        if (debug_data->stats_was_read)
 353                goto exit;
 354
 355        rc = debug_data->stats_count;
 356
 357exit:
 358        spin_unlock(&debug_data->lock);
 359        return rc;
 360}
 361
 362static __poll_t smsdvb_stats_poll(struct file *file, poll_table *wait)
 363{
 364        struct smsdvb_debugfs *debug_data = file->private_data;
 365        int rc;
 366
 367        kref_get(&debug_data->refcount);
 368
 369        poll_wait(file, &debug_data->stats_queue, wait);
 370
 371        rc = smsdvb_stats_wait_read(debug_data);
 372        kref_put(&debug_data->refcount, smsdvb_debugfs_data_release);
 373
 374        return rc > 0 ? EPOLLIN | EPOLLRDNORM : 0;
 375}
 376
 377static ssize_t smsdvb_stats_read(struct file *file, char __user *user_buf,
 378                                      size_t nbytes, loff_t *ppos)
 379{
 380        int rc = 0, len;
 381        struct smsdvb_debugfs *debug_data = file->private_data;
 382
 383        kref_get(&debug_data->refcount);
 384
 385        if (file->f_flags & O_NONBLOCK) {
 386                rc = smsdvb_stats_wait_read(debug_data);
 387                if (!rc) {
 388                        rc = -EWOULDBLOCK;
 389                        goto ret;
 390                }
 391        } else {
 392                rc = wait_event_interruptible(debug_data->stats_queue,
 393                                      smsdvb_stats_wait_read(debug_data));
 394                if (rc < 0)
 395                        goto ret;
 396        }
 397
 398        if (debug_data->stats_was_read) {
 399                rc = 0; /* EOF */
 400                goto ret;
 401        }
 402
 403        len = debug_data->stats_count - *ppos;
 404        if (len >= 0)
 405                rc = simple_read_from_buffer(user_buf, nbytes, ppos,
 406                                             debug_data->stats_data, len);
 407        else
 408                rc = 0;
 409
 410        if (*ppos >= debug_data->stats_count) {
 411                spin_lock(&debug_data->lock);
 412                debug_data->stats_was_read = true;
 413                spin_unlock(&debug_data->lock);
 414        }
 415ret:
 416        kref_put(&debug_data->refcount, smsdvb_debugfs_data_release);
 417        return rc;
 418}
 419
 420static int smsdvb_stats_release(struct inode *inode, struct file *file)
 421{
 422        struct smsdvb_debugfs *debug_data = file->private_data;
 423
 424        spin_lock(&debug_data->lock);
 425        debug_data->stats_was_read = true;      /* return EOF to read() */
 426        spin_unlock(&debug_data->lock);
 427        wake_up_interruptible_sync(&debug_data->stats_queue);
 428
 429        kref_put(&debug_data->refcount, smsdvb_debugfs_data_release);
 430        file->private_data = NULL;
 431
 432        return 0;
 433}
 434
 435static const struct file_operations debugfs_stats_ops = {
 436        .open = smsdvb_stats_open,
 437        .poll = smsdvb_stats_poll,
 438        .read = smsdvb_stats_read,
 439        .release = smsdvb_stats_release,
 440        .llseek = generic_file_llseek,
 441};
 442
 443/*
 444 * Functions used by smsdvb, in order to create the interfaces
 445 */
 446
 447int smsdvb_debugfs_create(struct smsdvb_client_t *client)
 448{
 449        struct smscore_device_t *coredev = client->coredev;
 450        struct dentry *d;
 451        struct smsdvb_debugfs *debug_data;
 452
 453        if (!smsdvb_debugfs_usb_root || !coredev->is_usb_device)
 454                return -ENODEV;
 455
 456        client->debugfs = debugfs_create_dir(coredev->devpath,
 457                                             smsdvb_debugfs_usb_root);
 458        if (IS_ERR_OR_NULL(client->debugfs)) {
 459                pr_info("Unable to create debugfs %s directory.\n",
 460                        coredev->devpath);
 461                return -ENODEV;
 462        }
 463
 464        d = debugfs_create_file("stats", S_IRUGO | S_IWUSR, client->debugfs,
 465                                client, &debugfs_stats_ops);
 466        if (!d) {
 467                debugfs_remove(client->debugfs);
 468                return -ENOMEM;
 469        }
 470
 471        debug_data = kzalloc(sizeof(*client->debug_data), GFP_KERNEL);
 472        if (!debug_data)
 473                return -ENOMEM;
 474
 475        client->debug_data        = debug_data;
 476        client->prt_dvb_stats     = smsdvb_print_dvb_stats;
 477        client->prt_isdb_stats    = smsdvb_print_isdb_stats;
 478        client->prt_isdb_stats_ex = smsdvb_print_isdb_stats_ex;
 479
 480        init_waitqueue_head(&debug_data->stats_queue);
 481        spin_lock_init(&debug_data->lock);
 482        kref_init(&debug_data->refcount);
 483
 484        return 0;
 485}
 486
 487void smsdvb_debugfs_release(struct smsdvb_client_t *client)
 488{
 489        if (!client->debugfs)
 490                return;
 491
 492        client->prt_dvb_stats     = NULL;
 493        client->prt_isdb_stats    = NULL;
 494        client->prt_isdb_stats_ex = NULL;
 495
 496        debugfs_remove_recursive(client->debugfs);
 497        kref_put(&client->debug_data->refcount, smsdvb_debugfs_data_release);
 498
 499        client->debug_data = NULL;
 500        client->debugfs = NULL;
 501}
 502
 503void smsdvb_debugfs_register(void)
 504{
 505        struct dentry *d;
 506
 507        /*
 508         * FIXME: This was written to debug Siano USB devices. So, it creates
 509         * the debugfs node under <debugfs>/usb.
 510         * A similar logic would be needed for Siano sdio devices, but, in that
 511         * case, usb_debug_root is not a good choice.
 512         *
 513         * Perhaps the right fix here would be to create another sysfs root
 514         * node for sdio-based boards, but this may need some logic at sdio
 515         * subsystem.
 516         */
 517        d = debugfs_create_dir("smsdvb", usb_debug_root);
 518        if (IS_ERR_OR_NULL(d)) {
 519                pr_err("Couldn't create sysfs node for smsdvb\n");
 520                return;
 521        }
 522        smsdvb_debugfs_usb_root = d;
 523}
 524
 525void smsdvb_debugfs_unregister(void)
 526{
 527        if (!smsdvb_debugfs_usb_root)
 528                return;
 529        debugfs_remove_recursive(smsdvb_debugfs_usb_root);
 530        smsdvb_debugfs_usb_root = NULL;
 531}
 532