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
  21 static struct dentry *smsdvb_debugfs_usb_root;
  22
  23 struct 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
  34 static 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 += sysfs_emit_at(buf, n, "is_rf_locked = %d\n", p->is_rf_locked);
  49         n += sysfs_emit_at(buf, n, "is_demod_locked = %d\n", p->is_demod_locked);
  50         n += sysfs_emit_at(buf, n, "is_external_lna_on = %d\n", p->is_external_lna_on);
  51         n += sysfs_emit_at(buf, n, "SNR = %d\n", p->SNR);
  52         n += sysfs_emit_at(buf, n, "ber = %d\n", p->ber);
  53         n += sysfs_emit_at(buf, n, "FIB_CRC = %d\n", p->FIB_CRC);
  54         n += sysfs_emit_at(buf, n, "ts_per = %d\n", p->ts_per);
  55         n += sysfs_emit_at(buf, n, "MFER = %d\n", p->MFER);
  56         n += sysfs_emit_at(buf, n, "RSSI = %d\n", p->RSSI);
  57         n += sysfs_emit_at(buf, n, "in_band_pwr = %d\n", p->in_band_pwr);
  58         n += sysfs_emit_at(buf, n, "carrier_offset = %d\n", p->carrier_offset);
  59         n += sysfs_emit_at(buf, n, "modem_state = %d\n", p->modem_state);
  60         n += sysfs_emit_at(buf, n, "frequency = %d\n", p->frequency);
  61         n += sysfs_emit_at(buf, n, "bandwidth = %d\n", p->bandwidth);
  62         n += sysfs_emit_at(buf, n, "transmission_mode = %d\n", p->transmission_mode);
  63         n += sysfs_emit_at(buf, n, "modem_state = %d\n", p->modem_state);
  64         n += sysfs_emit_at(buf, n, "guard_interval = %d\n", p->guard_interval);
  65         n += sysfs_emit_at(buf, n, "code_rate = %d\n", p->code_rate);
  66         n += sysfs_emit_at(buf, n, "lp_code_rate = %d\n", p->lp_code_rate);
  67         n += sysfs_emit_at(buf, n, "hierarchy = %d\n", p->hierarchy);
  68         n += sysfs_emit_at(buf, n, "constellation = %d\n", p->constellation);
  69         n += sysfs_emit_at(buf, n, "burst_size = %d\n", p->burst_size);
  70         n += sysfs_emit_at(buf, n, "burst_duration = %d\n", p->burst_duration);
  71         n += sysfs_emit_at(buf, n, "burst_cycle_time = %d\n", p->burst_cycle_time);
  72         n += sysfs_emit_at(buf, n, "calc_burst_cycle_time = %d\n", p->calc_burst_cycle_time);
  73         n += sysfs_emit_at(buf, n, "num_of_rows = %d\n", p->num_of_rows);
  74         n += sysfs_emit_at(buf, n, "num_of_padd_cols = %d\n", p->num_of_padd_cols);
  75         n += sysfs_emit_at(buf, n, "num_of_punct_cols = %d\n", p->num_of_punct_cols);
  76         n += sysfs_emit_at(buf, n, "error_ts_packets = %d\n", p->error_ts_packets);
  77         n += sysfs_emit_at(buf, n, "total_ts_packets = %d\n", p->total_ts_packets);
  78         n += sysfs_emit_at(buf, n, "num_of_valid_mpe_tlbs = %d\n", p->num_of_valid_mpe_tlbs);
  79         n += sysfs_emit_at(buf, n, "num_of_invalid_mpe_tlbs = %d\n", p->num_of_invalid_mpe_tlbs);
  80         n += sysfs_emit_at(buf, n, "num_of_corrected_mpe_tlbs = %d\n",
  81                            p->num_of_corrected_mpe_tlbs);
  82         n += sysfs_emit_at(buf, n, "ber_error_count = %d\n", p->ber_error_count);
  83         n += sysfs_emit_at(buf, n, "ber_bit_count = %d\n", p->ber_bit_count);
  84         n += sysfs_emit_at(buf, n, "sms_to_host_tx_errors = %d\n", p->sms_to_host_tx_errors);
  85         n += sysfs_emit_at(buf, n, "pre_ber = %d\n", p->pre_ber);
  86         n += sysfs_emit_at(buf, n, "cell_id = %d\n", p->cell_id);
  87         n += sysfs_emit_at(buf, n, "dvbh_srv_ind_hp = %d\n", p->dvbh_srv_ind_hp);
  88         n += sysfs_emit_at(buf, n, "dvbh_srv_ind_lp = %d\n", p->dvbh_srv_ind_lp);
  89         n += sysfs_emit_at(buf, n, "num_mpe_received = %d\n", p->num_mpe_received);
  90
  91         debug_data->stats_count = n;
  92         spin_unlock(&debug_data->lock);
  93         wake_up(&debug_data->stats_queue);
  94 }
  95
  96 static void smsdvb_print_isdb_stats(struct smsdvb_debugfs *debug_data,
  97                              struct sms_isdbt_stats *p)
  98 {
  99         int i, n = 0;
 100         char *buf;
 101
 102         spin_lock(&debug_data->lock);
 103         if (debug_data->stats_count) {
 104                 spin_unlock(&debug_data->lock);
 105                 return;
 106         }
 107
 108         buf = debug_data->stats_data;
 109
 110         n += sysfs_emit_at(buf, n, "statistics_type = %d\t", p->statistics_type);
 111         n += sysfs_emit_at(buf, n, "full_size = %d\n", p->full_size);
 112
 113         n += sysfs_emit_at(buf, n, "is_rf_locked = %d\t\t", p->is_rf_locked);
 114         n += sysfs_emit_at(buf, n, "is_demod_locked = %d\t", p->is_demod_locked);
 115         n += sysfs_emit_at(buf, n, "is_external_lna_on = %d\n", p->is_external_lna_on);
 116         n += sysfs_emit_at(buf, n, "SNR = %d dB\t\t", p->SNR);
 117         n += sysfs_emit_at(buf, n, "RSSI = %d dBm\t\t", p->RSSI);
 118         n += sysfs_emit_at(buf, n, "in_band_pwr = %d dBm\n", p->in_band_pwr);
 119         n += sysfs_emit_at(buf, n, "carrier_offset = %d\t", p->carrier_offset);
 120         n += sysfs_emit_at(buf, n, "bandwidth = %d\t\t", p->bandwidth);
 121         n += sysfs_emit_at(buf, n, "frequency = %d Hz\n", p->frequency);
 122         n += sysfs_emit_at(buf, n, "transmission_mode = %d\t", p->transmission_mode);
 123         n += sysfs_emit_at(buf, n, "modem_state = %d\t\t", p->modem_state);
 124         n += sysfs_emit_at(buf, n, "guard_interval = %d\n", p->guard_interval);
 125         n += sysfs_emit_at(buf, n, "system_type = %d\t\t", p->system_type);
 126         n += sysfs_emit_at(buf, n, "partial_reception = %d\t", p->partial_reception);
 127         n += sysfs_emit_at(buf, n, "num_of_layers = %d\n", p->num_of_layers);
 128         n += sysfs_emit_at(buf, n, "sms_to_host_tx_errors = %d\n", p->sms_to_host_tx_errors);
 129
 130         for (i = 0; i < 3; i++) {
 131                 if (p->layer_info[i].number_of_segments < 1 ||
 132                     p->layer_info[i].number_of_segments > 13)
 133                         continue;
 134
 135                 n += sysfs_emit_at(buf, n, "\nLayer %d\n", i);
 136                 n += sysfs_emit_at(buf, n, "\tcode_rate = %d\t", p->layer_info[i].code_rate);
 137                 n += sysfs_emit_at(buf, n, "constellation = %d\n", p->layer_info[i].constellation);
 138                 n += sysfs_emit_at(buf, n, "\tber = %-5d\t", p->layer_info[i].ber);
 139                 n += sysfs_emit_at(buf, n, "\tber_error_count = %-5d\t",
 140                                    p->layer_info[i].ber_error_count);
 141                 n += sysfs_emit_at(buf, n, "ber_bit_count = %-5d\n",
 142                                    p->layer_info[i].ber_bit_count);
 143                 n += sysfs_emit_at(buf, n, "\tpre_ber = %-5d\t", p->layer_info[i].pre_ber);
 144                 n += sysfs_emit_at(buf, n, "\tts_per = %-5d\n", p->layer_info[i].ts_per);
 145                 n += sysfs_emit_at(buf, n, "\terror_ts_packets = %-5d\t",
 146                                    p->layer_info[i].error_ts_packets);
 147                 n += sysfs_emit_at(buf, n, "total_ts_packets = %-5d\t",
 148                                    p->layer_info[i].total_ts_packets);
 149                 n += sysfs_emit_at(buf, n, "ti_ldepth_i = %d\n", p->layer_info[i].ti_ldepth_i);
 150                 n += sysfs_emit_at(buf, n, "\tnumber_of_segments = %d\t",
 151                                    p->layer_info[i].number_of_segments);
 152                 n += sysfs_emit_at(buf, n, "tmcc_errors = %d\n", p->layer_info[i].tmcc_errors);
 153         }
 154
 155         debug_data->stats_count = n;
 156         spin_unlock(&debug_data->lock);
 157         wake_up(&debug_data->stats_queue);
 158 }
 159
 160 static void smsdvb_print_isdb_stats_ex(struct smsdvb_debugfs *debug_data,
 161                                 struct sms_isdbt_stats_ex *p)
 162 {
 163         int i, n = 0;
 164         char *buf;
 165
 166         spin_lock(&debug_data->lock);
 167         if (debug_data->stats_count) {
 168                 spin_unlock(&debug_data->lock);
 169                 return;
 170         }
 171
 172         buf = debug_data->stats_data;
 173
 174         n += sysfs_emit_at(buf, n, "statistics_type = %d\t", p->statistics_type);
 175         n += sysfs_emit_at(buf, n, "full_size = %d\n", p->full_size);
 176
 177         n += sysfs_emit_at(buf, n, "is_rf_locked = %d\t\t", p->is_rf_locked);
 178         n += sysfs_emit_at(buf, n, "is_demod_locked = %d\t", p->is_demod_locked);
 179         n += sysfs_emit_at(buf, n, "is_external_lna_on = %d\n", p->is_external_lna_on);
 180         n += sysfs_emit_at(buf, n, "SNR = %d dB\t\t", p->SNR);
 181         n += sysfs_emit_at(buf, n, "RSSI = %d dBm\t\t", p->RSSI);
 182         n += sysfs_emit_at(buf, n, "in_band_pwr = %d dBm\n", p->in_band_pwr);
 183         n += sysfs_emit_at(buf, n, "carrier_offset = %d\t", p->carrier_offset);
 184         n += sysfs_emit_at(buf, n, "bandwidth = %d\t\t", p->bandwidth);
 185         n += sysfs_emit_at(buf, n, "frequency = %d Hz\n", p->frequency);
 186         n += sysfs_emit_at(buf, n, "transmission_mode = %d\t", p->transmission_mode);
 187         n += sysfs_emit_at(buf, n, "modem_state = %d\t\t", p->modem_state);
 188         n += sysfs_emit_at(buf, n, "guard_interval = %d\n", p->guard_interval);
 189         n += sysfs_emit_at(buf, n, "system_type = %d\t\t", p->system_type);
 190         n += sysfs_emit_at(buf, n, "partial_reception = %d\t", p->partial_reception);
 191         n += sysfs_emit_at(buf, n, "num_of_layers = %d\n", p->num_of_layers);
 192         n += sysfs_emit_at(buf, n, "segment_number = %d\t", p->segment_number);
 193         n += sysfs_emit_at(buf, n, "tune_bw = %d\n", p->tune_bw);
 194
 195         for (i = 0; i < 3; i++) {
 196                 if (p->layer_info[i].number_of_segments < 1 ||
 197                     p->layer_info[i].number_of_segments > 13)
 198                         continue;
 199
 200                 n += sysfs_emit_at(buf, n, "\nLayer %d\n", i);
 201                 n += sysfs_emit_at(buf, n, "\tcode_rate = %d\t", p->layer_info[i].code_rate);
 202                 n += sysfs_emit_at(buf, n, "constellation = %d\n", p->layer_info[i].constellation);
 203                 n += sysfs_emit_at(buf, n, "\tber = %-5d\t", p->layer_info[i].ber);
 204                 n += sysfs_emit_at(buf, n, "\tber_error_count = %-5d\t",
 205                                    p->layer_info[i].ber_error_count);
 206                 n += sysfs_emit_at(buf, n, "ber_bit_count = %-5d\n",
 207                                    p->layer_info[i].ber_bit_count);
 208                 n += sysfs_emit_at(buf, n, "\tpre_ber = %-5d\t", p->layer_info[i].pre_ber);
 209                 n += sysfs_emit_at(buf, n, "\tts_per = %-5d\n", p->layer_info[i].ts_per);
 210                 n += sysfs_emit_at(buf, n, "\terror_ts_packets = %-5d\t",
 211                                    p->layer_info[i].error_ts_packets);
 212                 n += sysfs_emit_at(buf, n, "total_ts_packets = %-5d\t",
 213                                    p->layer_info[i].total_ts_packets);
 214                 n += sysfs_emit_at(buf, n, "ti_ldepth_i = %d\n", p->layer_info[i].ti_ldepth_i);
 215                 n += sysfs_emit_at(buf, n, "\tnumber_of_segments = %d\t",
 216                                    p->layer_info[i].number_of_segments);
 217                 n += sysfs_emit_at(buf, n, "tmcc_errors = %d\n", p->layer_info[i].tmcc_errors);
 218         }
 219
 220
 221         debug_data->stats_count = n;
 222         spin_unlock(&debug_data->lock);
 223
 224         wake_up(&debug_data->stats_queue);
 225 }
 226
 227 static int smsdvb_stats_open(struct inode *inode, struct file *file)
 228 {
 229         struct smsdvb_client_t *client = inode->i_private;
 230         struct smsdvb_debugfs *debug_data = client->debug_data;
 231
 232         kref_get(&debug_data->refcount);
 233
 234         spin_lock(&debug_data->lock);
 235         debug_data->stats_count = 0;
 236         debug_data->stats_was_read = false;
 237         spin_unlock(&debug_data->lock);
 238
 239         file->private_data = debug_data;
 240
 241         return 0;
 242 }
 243
 244 static void smsdvb_debugfs_data_release(struct kref *ref)
 245 {
 246         struct smsdvb_debugfs *debug_data;
 247
 248         debug_data = container_of(ref, struct smsdvb_debugfs, refcount);
 249         kfree(debug_data);
 250 }
 251
 252 static int smsdvb_stats_wait_read(struct smsdvb_debugfs *debug_data)
 253 {
 254         int rc = 1;
 255
 256         spin_lock(&debug_data->lock);
 257
 258         if (debug_data->stats_was_read)
 259                 goto exit;
 260
 261         rc = debug_data->stats_count;
 262
 263 exit:
 264         spin_unlock(&debug_data->lock);
 265         return rc;
 266 }
 267
 268 static __poll_t smsdvb_stats_poll(struct file *file, poll_table *wait)
 269 {
 270         struct smsdvb_debugfs *debug_data = file->private_data;
 271         int rc;
 272
 273         kref_get(&debug_data->refcount);
 274
 275         poll_wait(file, &debug_data->stats_queue, wait);
 276
 277         rc = smsdvb_stats_wait_read(debug_data);
 278         kref_put(&debug_data->refcount, smsdvb_debugfs_data_release);
 279
 280         return rc > 0 ? EPOLLIN | EPOLLRDNORM : 0;
 281 }
 282
 283 static ssize_t smsdvb_stats_read(struct file *file, char __user *user_buf,
 284                                       size_t nbytes, loff_t *ppos)
 285 {
 286         int rc = 0, len;
 287         struct smsdvb_debugfs *debug_data = file->private_data;
 288
 289         kref_get(&debug_data->refcount);
 290
 291         if (file->f_flags & O_NONBLOCK) {
 292                 rc = smsdvb_stats_wait_read(debug_data);
 293                 if (!rc) {
 294                         rc = -EWOULDBLOCK;
 295                         goto ret;
 296                 }
 297         } else {
 298                 rc = wait_event_interruptible(debug_data->stats_queue,
 299                                       smsdvb_stats_wait_read(debug_data));
 300                 if (rc < 0)
 301                         goto ret;
 302         }
 303
 304         if (debug_data->stats_was_read) {
 305                 rc = 0; /* EOF */
 306                 goto ret;
 307         }
 308
 309         len = debug_data->stats_count - *ppos;
 310         if (len >= 0)
 311                 rc = simple_read_from_buffer(user_buf, nbytes, ppos,
 312                                              debug_data->stats_data, len);
 313         else
 314                 rc = 0;
 315
 316         if (*ppos >= debug_data->stats_count) {
 317                 spin_lock(&debug_data->lock);
 318                 debug_data->stats_was_read = true;
 319                 spin_unlock(&debug_data->lock);
 320         }
 321 ret:
 322         kref_put(&debug_data->refcount, smsdvb_debugfs_data_release);
 323         return rc;
 324 }
 325
 326 static int smsdvb_stats_release(struct inode *inode, struct file *file)
 327 {
 328         struct smsdvb_debugfs *debug_data = file->private_data;
 329
 330         spin_lock(&debug_data->lock);
 331         debug_data->stats_was_read = true;      /* return EOF to read() */
 332         spin_unlock(&debug_data->lock);
 333         wake_up_interruptible_sync(&debug_data->stats_queue);
 334
 335         kref_put(&debug_data->refcount, smsdvb_debugfs_data_release);
 336         file->private_data = NULL;
 337
 338         return 0;
 339 }
 340
 341 static const struct file_operations debugfs_stats_ops = {
 342         .open = smsdvb_stats_open,
 343         .poll = smsdvb_stats_poll,
 344         .read = smsdvb_stats_read,
 345         .release = smsdvb_stats_release,
 346         .llseek = generic_file_llseek,
 347 };
 348
 349 /*
 350  * Functions used by smsdvb, in order to create the interfaces
 351  */
 352
 353 int smsdvb_debugfs_create(struct smsdvb_client_t *client)
 354 {
 355         struct smscore_device_t *coredev = client->coredev;
 356         struct smsdvb_debugfs *debug_data;
 357
 358         if (!smsdvb_debugfs_usb_root || !coredev->is_usb_device)
 359                 return -ENODEV;
 360
 361         debug_data = kzalloc(sizeof(*client->debug_data), GFP_KERNEL);
 362         if (!debug_data)
 363                 return -ENOMEM;
 364
 365         client->debugfs = debugfs_create_dir(coredev->devpath,
 366                                              smsdvb_debugfs_usb_root);
 367
 368         debugfs_create_file("stats", S_IRUGO | S_IWUSR, client->debugfs,
 369                             client, &debugfs_stats_ops);
 370
 371         client->debug_data        = debug_data;
 372         client->prt_dvb_stats     = smsdvb_print_dvb_stats;
 373         client->prt_isdb_stats    = smsdvb_print_isdb_stats;
 374         client->prt_isdb_stats_ex = smsdvb_print_isdb_stats_ex;
 375
 376         init_waitqueue_head(&debug_data->stats_queue);
 377         spin_lock_init(&debug_data->lock);
 378         kref_init(&debug_data->refcount);
 379
 380         return 0;
 381 }
 382
 383 void smsdvb_debugfs_release(struct smsdvb_client_t *client)
 384 {
 385         if (!client->debugfs)
 386                 return;
 387
 388         client->prt_dvb_stats     = NULL;
 389         client->prt_isdb_stats    = NULL;
 390         client->prt_isdb_stats_ex = NULL;
 391
 392         debugfs_remove_recursive(client->debugfs);
 393         kref_put(&client->debug_data->refcount, smsdvb_debugfs_data_release);
 394
 395         client->debug_data = NULL;
 396         client->debugfs = NULL;
 397 }
 398
 399 void smsdvb_debugfs_register(void)
 400 {
 401         /*
 402          * FIXME: This was written to debug Siano USB devices. So, it creates
 403          * the debugfs node under <debugfs>/usb.
 404          * A similar logic would be needed for Siano sdio devices, but, in that
 405          * case, usb_debug_root is not a good choice.
 406          *
 407          * Perhaps the right fix here would be to create another sysfs root
 408          * node for sdio-based boards, but this may need some logic at sdio
 409          * subsystem.
 410          */
 411         smsdvb_debugfs_usb_root = debugfs_create_dir("smsdvb", usb_debug_root);
 412 }
 413
 414 void smsdvb_debugfs_unregister(void)
 415 {
 416         if (!smsdvb_debugfs_usb_root)
 417                 return;
 418         debugfs_remove_recursive(smsdvb_debugfs_usb_root);
 419         smsdvb_debugfs_usb_root = NULL;
 420 }