drivers/media/usb/pvrusb2/pvrusb2-dvb.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  *  pvrusb2-dvb.c - linux-dvb api interface to the pvrusb2 driver.
   4  *
   5  *  Copyright (C) 2007, 2008 Michael Krufky <mkrufky@linuxtv.org>
   6  */
   7
   8 #include <linux/kthread.h>
   9 #include <linux/freezer.h>
  10 #include <linux/slab.h>
  11 #include <linux/mm.h>
  12 #include <media/dvbdev.h>
  13 #include "pvrusb2-debug.h"
  14 #include "pvrusb2-hdw-internal.h"
  15 #include "pvrusb2-hdw.h"
  16 #include "pvrusb2-io.h"
  17 #include "pvrusb2-dvb.h"
  18
  19 DVB_DEFINE_MOD_OPT_ADAPTER_NR(adapter_nr);
  20
  21 static int pvr2_dvb_feed_func(struct pvr2_dvb_adapter *adap)
  22 {
  23         int ret;
  24         unsigned int count;
  25         struct pvr2_buffer *bp;
  26         struct pvr2_stream *stream;
  27
  28         pvr2_trace(PVR2_TRACE_DVB_FEED, "dvb feed thread started");
  29         set_freezable();
  30
  31         stream = adap->channel.stream->stream;
  32
  33         for (;;) {
  34                 if (kthread_should_stop()) break;
  35
  36                 /* Not sure about this... */
  37                 try_to_freeze();
  38
  39                 bp = pvr2_stream_get_ready_buffer(stream);
  40                 if (bp != NULL) {
  41                         count = pvr2_buffer_get_count(bp);
  42                         if (count) {
  43                                 dvb_dmx_swfilter(
  44                                         &adap->demux,
  45                                         adap->buffer_storage[
  46                                             pvr2_buffer_get_id(bp)],
  47                                         count);
  48                         } else {
  49                                 ret = pvr2_buffer_get_status(bp);
  50                                 if (ret < 0) break;
  51                         }
  52                         ret = pvr2_buffer_queue(bp);
  53                         if (ret < 0) break;
  54
  55                         /* Since we know we did something to a buffer,
  56                            just go back and try again.  No point in
  57                            blocking unless we really ran out of
  58                            buffers to process. */
  59                         continue;
  60                 }
  61
  62
  63                 /* Wait until more buffers become available or we're
  64                    told not to wait any longer. */
  65                 ret = wait_event_interruptible(
  66                     adap->buffer_wait_data,
  67                     (pvr2_stream_get_ready_count(stream) > 0) ||
  68                     kthread_should_stop());
  69                 if (ret < 0) break;
  70         }
  71
  72         /* If we get here and ret is < 0, then an error has occurred.
  73            Probably would be a good idea to communicate that to DVB core... */
  74
  75         pvr2_trace(PVR2_TRACE_DVB_FEED, "dvb feed thread stopped");
  76
  77         return 0;
  78 }
  79
  80 static int pvr2_dvb_feed_thread(void *data)
  81 {
  82         int stat = pvr2_dvb_feed_func(data);
  83         /* from videobuf-dvb.c: */
  84         while (!kthread_should_stop()) {
  85                 set_current_state(TASK_INTERRUPTIBLE);
  86                 schedule();
  87         }
  88         return stat;
  89 }
  90
  91 static void pvr2_dvb_notify(struct pvr2_dvb_adapter *adap)
  92 {
  93         wake_up(&adap->buffer_wait_data);
  94 }
  95
  96 static void pvr2_dvb_stream_end(struct pvr2_dvb_adapter *adap)
  97 {
  98         unsigned int idx;
  99         struct pvr2_stream *stream;
 100
 101         if (adap->thread) {
 102                 kthread_stop(adap->thread);
 103                 adap->thread = NULL;
 104         }
 105
 106         if (adap->channel.stream) {
 107                 stream = adap->channel.stream->stream;
 108         } else {
 109                 stream = NULL;
 110         }
 111         if (stream) {
 112                 pvr2_hdw_set_streaming(adap->channel.hdw, 0);
 113                 pvr2_stream_set_callback(stream, NULL, NULL);
 114                 pvr2_stream_kill(stream);
 115                 pvr2_stream_set_buffer_count(stream, 0);
 116                 pvr2_channel_claim_stream(&adap->channel, NULL);
 117         }
 118
 119         if (adap->stream_run) {
 120                 for (idx = 0; idx < PVR2_DVB_BUFFER_COUNT; idx++) {
 121                         if (!(adap->buffer_storage[idx])) continue;
 122                         kfree(adap->buffer_storage[idx]);
 123                         adap->buffer_storage[idx] = NULL;
 124                 }
 125                 adap->stream_run = 0;
 126         }
 127 }
 128
 129 static int pvr2_dvb_stream_do_start(struct pvr2_dvb_adapter *adap)
 130 {
 131         struct pvr2_context *pvr = adap->channel.mc_head;
 132         unsigned int idx;
 133         int ret;
 134         struct pvr2_buffer *bp;
 135         struct pvr2_stream *stream = NULL;
 136
 137         if (adap->stream_run) return -EIO;
 138
 139         ret = pvr2_channel_claim_stream(&adap->channel, &pvr->video_stream);
 140         /* somebody else already has the stream */
 141         if (ret < 0) return ret;
 142
 143         stream = adap->channel.stream->stream;
 144
 145         for (idx = 0; idx < PVR2_DVB_BUFFER_COUNT; idx++) {
 146                 adap->buffer_storage[idx] = kmalloc(PVR2_DVB_BUFFER_SIZE,
 147                                                     GFP_KERNEL);
 148                 if (!(adap->buffer_storage[idx])) return -ENOMEM;
 149         }
 150
 151         pvr2_stream_set_callback(pvr->video_stream.stream,
 152                                  (pvr2_stream_callback) pvr2_dvb_notify, adap);
 153
 154         ret = pvr2_stream_set_buffer_count(stream, PVR2_DVB_BUFFER_COUNT);
 155         if (ret < 0) return ret;
 156
 157         for (idx = 0; idx < PVR2_DVB_BUFFER_COUNT; idx++) {
 158                 bp = pvr2_stream_get_buffer(stream, idx);
 159                 pvr2_buffer_set_buffer(bp,
 160                                        adap->buffer_storage[idx],
 161                                        PVR2_DVB_BUFFER_SIZE);
 162         }
 163
 164         ret = pvr2_hdw_set_streaming(adap->channel.hdw, 1);
 165         if (ret < 0) return ret;
 166
 167         while ((bp = pvr2_stream_get_idle_buffer(stream)) != NULL) {
 168                 ret = pvr2_buffer_queue(bp);
 169                 if (ret < 0) return ret;
 170         }
 171
 172         adap->thread = kthread_run(pvr2_dvb_feed_thread, adap, "pvrusb2-dvb");
 173
 174         if (IS_ERR(adap->thread)) {
 175                 ret = PTR_ERR(adap->thread);
 176                 adap->thread = NULL;
 177                 return ret;
 178         }
 179
 180         adap->stream_run = !0;
 181
 182         return 0;
 183 }
 184
 185 static int pvr2_dvb_stream_start(struct pvr2_dvb_adapter *adap)
 186 {
 187         int ret = pvr2_dvb_stream_do_start(adap);
 188         if (ret < 0) pvr2_dvb_stream_end(adap);
 189         return ret;
 190 }
 191
 192 static int pvr2_dvb_ctrl_feed(struct dvb_demux_feed *dvbdmxfeed, int onoff)
 193 {
 194         struct pvr2_dvb_adapter *adap = dvbdmxfeed->demux->priv;
 195         int ret = 0;
 196
 197         if (adap == NULL) return -ENODEV;
 198
 199         mutex_lock(&adap->lock);
 200         do {
 201                 if (onoff) {
 202                         if (!adap->feedcount) {
 203                                 pvr2_trace(PVR2_TRACE_DVB_FEED,
 204                                            "start feeding demux");
 205                                 ret = pvr2_dvb_stream_start(adap);
 206                                 if (ret < 0) break;
 207                         }
 208                         (adap->feedcount)++;
 209                 } else if (adap->feedcount > 0) {
 210                         (adap->feedcount)--;
 211                         if (!adap->feedcount) {
 212                                 pvr2_trace(PVR2_TRACE_DVB_FEED,
 213                                            "stop feeding demux");
 214                                 pvr2_dvb_stream_end(adap);
 215                         }
 216                 }
 217         } while (0);
 218         mutex_unlock(&adap->lock);
 219
 220         return ret;
 221 }
 222
 223 static int pvr2_dvb_start_feed(struct dvb_demux_feed *dvbdmxfeed)
 224 {
 225         pvr2_trace(PVR2_TRACE_DVB_FEED, "start pid: 0x%04x", dvbdmxfeed->pid);
 226         return pvr2_dvb_ctrl_feed(dvbdmxfeed, 1);
 227 }
 228
 229 static int pvr2_dvb_stop_feed(struct dvb_demux_feed *dvbdmxfeed)
 230 {
 231         pvr2_trace(PVR2_TRACE_DVB_FEED, "stop pid: 0x%04x", dvbdmxfeed->pid);
 232         return pvr2_dvb_ctrl_feed(dvbdmxfeed, 0);
 233 }
 234
 235 static int pvr2_dvb_bus_ctrl(struct dvb_frontend *fe, int acquire)
 236 {
 237         struct pvr2_dvb_adapter *adap = fe->dvb->priv;
 238         return pvr2_channel_limit_inputs(
 239             &adap->channel,
 240             (acquire ? (1 << PVR2_CVAL_INPUT_DTV) : 0));
 241 }
 242
 243 static int pvr2_dvb_adapter_init(struct pvr2_dvb_adapter *adap)
 244 {
 245         int ret;
 246
 247         ret = dvb_register_adapter(&adap->dvb_adap, "pvrusb2-dvb",
 248                                    THIS_MODULE/*&hdw->usb_dev->owner*/,
 249                                    &adap->channel.hdw->usb_dev->dev,
 250                                    adapter_nr);
 251         if (ret < 0) {
 252                 pvr2_trace(PVR2_TRACE_ERROR_LEGS,
 253                            "dvb_register_adapter failed: error %d", ret);
 254                 goto err;
 255         }
 256         adap->dvb_adap.priv = adap;
 257
 258         adap->demux.dmx.capabilities = DMX_TS_FILTERING |
 259                                        DMX_SECTION_FILTERING |
 260                                        DMX_MEMORY_BASED_FILTERING;
 261         adap->demux.priv             = adap;
 262         adap->demux.filternum        = 256;
 263         adap->demux.feednum          = 256;
 264         adap->demux.start_feed       = pvr2_dvb_start_feed;
 265         adap->demux.stop_feed        = pvr2_dvb_stop_feed;
 266         adap->demux.write_to_decoder = NULL;
 267
 268         ret = dvb_dmx_init(&adap->demux);
 269         if (ret < 0) {
 270                 pvr2_trace(PVR2_TRACE_ERROR_LEGS,
 271                            "dvb_dmx_init failed: error %d", ret);
 272                 goto err_dmx;
 273         }
 274
 275         adap->dmxdev.filternum       = adap->demux.filternum;
 276         adap->dmxdev.demux           = &adap->demux.dmx;
 277         adap->dmxdev.capabilities    = 0;
 278
 279         ret = dvb_dmxdev_init(&adap->dmxdev, &adap->dvb_adap);
 280         if (ret < 0) {
 281                 pvr2_trace(PVR2_TRACE_ERROR_LEGS,
 282                            "dvb_dmxdev_init failed: error %d", ret);
 283                 goto err_dmx_dev;
 284         }
 285
 286         dvb_net_init(&adap->dvb_adap, &adap->dvb_net, &adap->demux.dmx);
 287
 288         return 0;
 289
 290 err_dmx_dev:
 291         dvb_dmx_release(&adap->demux);
 292 err_dmx:
 293         dvb_unregister_adapter(&adap->dvb_adap);
 294 err:
 295         return ret;
 296 }
 297
 298 static int pvr2_dvb_adapter_exit(struct pvr2_dvb_adapter *adap)
 299 {
 300         pvr2_trace(PVR2_TRACE_INFO, "unregistering DVB devices");
 301         dvb_net_release(&adap->dvb_net);
 302         adap->demux.dmx.close(&adap->demux.dmx);
 303         dvb_dmxdev_release(&adap->dmxdev);
 304         dvb_dmx_release(&adap->demux);
 305         dvb_unregister_adapter(&adap->dvb_adap);
 306         return 0;
 307 }
 308
 309 static int pvr2_dvb_frontend_init(struct pvr2_dvb_adapter *adap)
 310 {
 311         struct pvr2_hdw *hdw = adap->channel.hdw;
 312         const struct pvr2_dvb_props *dvb_props = hdw->hdw_desc->dvb_props;
 313         int ret = 0;
 314
 315         if (dvb_props == NULL) {
 316                 pvr2_trace(PVR2_TRACE_ERROR_LEGS, "fe_props not defined!");
 317                 return -EINVAL;
 318         }
 319
 320         ret = pvr2_channel_limit_inputs(
 321             &adap->channel,
 322             (1 << PVR2_CVAL_INPUT_DTV));
 323         if (ret) {
 324                 pvr2_trace(PVR2_TRACE_ERROR_LEGS,
 325                            "failed to grab control of dtv input (code=%d)",
 326                     ret);
 327                 return ret;
 328         }
 329
 330         if (dvb_props->frontend_attach == NULL) {
 331                 pvr2_trace(PVR2_TRACE_ERROR_LEGS,
 332                            "frontend_attach not defined!");
 333                 ret = -EINVAL;
 334                 goto done;
 335         }
 336
 337         if (dvb_props->frontend_attach(adap) == 0 && adap->fe[0]) {
 338                 if (dvb_register_frontend(&adap->dvb_adap, adap->fe[0])) {
 339                         pvr2_trace(PVR2_TRACE_ERROR_LEGS,
 340                                    "frontend registration failed!");
 341                         ret = -ENODEV;
 342                         goto fail_frontend0;
 343                 }
 344                 if (adap->fe[0]->ops.analog_ops.standby)
 345                         adap->fe[0]->ops.analog_ops.standby(adap->fe[0]);
 346
 347                 pvr2_trace(PVR2_TRACE_INFO, "transferring fe[%d] ts_bus_ctrl() to pvr2_dvb_bus_ctrl()",
 348                            adap->fe[0]->id);
 349                 adap->fe[0]->ops.ts_bus_ctrl = pvr2_dvb_bus_ctrl;
 350         } else {
 351                 pvr2_trace(PVR2_TRACE_ERROR_LEGS,
 352                            "no frontend was attached!");
 353                 ret = -ENODEV;
 354                 return ret;
 355         }
 356
 357         if (dvb_props->tuner_attach && dvb_props->tuner_attach(adap)) {
 358                 pvr2_trace(PVR2_TRACE_ERROR_LEGS, "tuner attach failed");
 359                 ret = -ENODEV;
 360                 goto fail_tuner;
 361         }
 362
 363         if (adap->fe[1]) {
 364                 adap->fe[1]->id = 1;
 365                 adap->fe[1]->tuner_priv = adap->fe[0]->tuner_priv;
 366                 memcpy(&adap->fe[1]->ops.tuner_ops,
 367                        &adap->fe[0]->ops.tuner_ops,
 368                        sizeof(struct dvb_tuner_ops));
 369
 370                 if (dvb_register_frontend(&adap->dvb_adap, adap->fe[1])) {
 371                         pvr2_trace(PVR2_TRACE_ERROR_LEGS,
 372                                    "frontend registration failed!");
 373                         ret = -ENODEV;
 374                         goto fail_frontend1;
 375                 }
 376                 /* MFE lock */
 377                 adap->dvb_adap.mfe_shared = 1;
 378
 379                 if (adap->fe[1]->ops.analog_ops.standby)
 380                         adap->fe[1]->ops.analog_ops.standby(adap->fe[1]);
 381
 382                 pvr2_trace(PVR2_TRACE_INFO, "transferring fe[%d] ts_bus_ctrl() to pvr2_dvb_bus_ctrl()",
 383                            adap->fe[1]->id);
 384                 adap->fe[1]->ops.ts_bus_ctrl = pvr2_dvb_bus_ctrl;
 385         }
 386 done:
 387         pvr2_channel_limit_inputs(&adap->channel, 0);
 388         return ret;
 389
 390 fail_frontend1:
 391         dvb_frontend_detach(adap->fe[1]);
 392         adap->fe[1] = NULL;
 393 fail_tuner:
 394         dvb_unregister_frontend(adap->fe[0]);
 395 fail_frontend0:
 396         dvb_frontend_detach(adap->fe[0]);
 397         adap->fe[0] = NULL;
 398         dvb_module_release(adap->i2c_client_tuner);
 399         dvb_module_release(adap->i2c_client_demod[1]);
 400         dvb_module_release(adap->i2c_client_demod[0]);
 401
 402         return ret;
 403 }
 404
 405 static int pvr2_dvb_frontend_exit(struct pvr2_dvb_adapter *adap)
 406 {
 407         if (adap->fe[1]) {
 408                 dvb_unregister_frontend(adap->fe[1]);
 409                 dvb_frontend_detach(adap->fe[1]);
 410                 adap->fe[1] = NULL;
 411         }
 412         if (adap->fe[0]) {
 413                 dvb_unregister_frontend(adap->fe[0]);
 414                 dvb_frontend_detach(adap->fe[0]);
 415                 adap->fe[0] = NULL;
 416         }
 417
 418         dvb_module_release(adap->i2c_client_tuner);
 419         adap->i2c_client_tuner = NULL;
 420         dvb_module_release(adap->i2c_client_demod[1]);
 421         adap->i2c_client_demod[1] = NULL;
 422         dvb_module_release(adap->i2c_client_demod[0]);
 423         adap->i2c_client_demod[0] = NULL;
 424
 425         return 0;
 426 }
 427
 428 static void pvr2_dvb_destroy(struct pvr2_dvb_adapter *adap)
 429 {
 430         pvr2_dvb_stream_end(adap);
 431         pvr2_dvb_frontend_exit(adap);
 432         pvr2_dvb_adapter_exit(adap);
 433         pvr2_channel_done(&adap->channel);
 434         kfree(adap);
 435 }
 436
 437 static void pvr2_dvb_internal_check(struct pvr2_channel *chp)
 438 {
 439         struct pvr2_dvb_adapter *adap;
 440         adap = container_of(chp, struct pvr2_dvb_adapter, channel);
 441         if (!adap->channel.mc_head->disconnect_flag) return;
 442         pvr2_dvb_destroy(adap);
 443 }
 444
 445 struct pvr2_dvb_adapter *pvr2_dvb_create(struct pvr2_context *pvr)
 446 {
 447         int ret = 0;
 448         struct pvr2_dvb_adapter *adap;
 449         if (!pvr->hdw->hdw_desc->dvb_props) {
 450                 /* Device lacks a digital interface so don't set up
 451                    the DVB side of the driver either.  For now. */
 452                 return NULL;
 453         }
 454         adap = kzalloc(sizeof(*adap), GFP_KERNEL);
 455         if (!adap) return adap;
 456         pvr2_channel_init(&adap->channel, pvr);
 457         adap->channel.check_func = pvr2_dvb_internal_check;
 458         init_waitqueue_head(&adap->buffer_wait_data);
 459         mutex_init(&adap->lock);
 460         ret = pvr2_dvb_adapter_init(adap);
 461         if (ret < 0) goto fail1;
 462         ret = pvr2_dvb_frontend_init(adap);
 463         if (ret < 0) goto fail2;
 464         return adap;
 465
 466 fail2:
 467         pvr2_dvb_adapter_exit(adap);
 468 fail1:
 469         pvr2_channel_done(&adap->channel);
 470         return NULL;
 471 }
 472