drivers/media/common/videobuf2/videobuf2-dvb.c

   1 // SPDX-License-Identifier: GPL-2.0-or-later
   2 /*
   3  *
   4  * some helper function for simple DVB cards which simply DMA the
   5  * complete transport stream and let the computer sort everything else
   6  * (i.e. we are using the software demux, ...).  Also uses vb2
   7  * to manage DMA buffers.
   8  *
   9  * (c) 2004 Gerd Knorr <kraxel@bytesex.org> [SUSE Labs]
  10  */
  11
  12 #include <linux/module.h>
  13 #include <linux/init.h>
  14 #include <linux/device.h>
  15 #include <linux/slab.h>
  16
  17 #include <media/videobuf2-dvb.h>
  18
  19 /* ------------------------------------------------------------------ */
  20
  21 MODULE_AUTHOR("Gerd Knorr <kraxel@bytesex.org> [SuSE Labs]");
  22 MODULE_DESCRIPTION("Videobuf2 helper library for simple DVB cards");
  23 MODULE_LICENSE("GPL");
  24
  25 /* ------------------------------------------------------------------ */
  26
  27 static int dvb_fnc(struct vb2_buffer *vb, void *priv)
  28 {
  29         struct vb2_dvb *dvb = priv;
  30
  31         dvb_dmx_swfilter(&dvb->demux, vb2_plane_vaddr(vb, 0),
  32                                       vb2_get_plane_payload(vb, 0));
  33         return 0;
  34 }
  35
  36 static int vb2_dvb_start_feed(struct dvb_demux_feed *feed)
  37 {
  38         struct dvb_demux *demux = feed->demux;
  39         struct vb2_dvb *dvb = demux->priv;
  40         int rc = 0;
  41
  42         if (!demux->dmx.frontend)
  43                 return -EINVAL;
  44
  45         mutex_lock(&dvb->lock);
  46         dvb->nfeeds++;
  47
  48         if (!dvb->dvbq.threadio) {
  49                 rc = vb2_thread_start(&dvb->dvbq, dvb_fnc, dvb, dvb->name);
  50                 if (rc)
  51                         dvb->nfeeds--;
  52         }
  53         if (!rc)
  54                 rc = dvb->nfeeds;
  55         mutex_unlock(&dvb->lock);
  56         return rc;
  57 }
  58
  59 static int vb2_dvb_stop_feed(struct dvb_demux_feed *feed)
  60 {
  61         struct dvb_demux *demux = feed->demux;
  62         struct vb2_dvb *dvb = demux->priv;
  63         int err = 0;
  64
  65         mutex_lock(&dvb->lock);
  66         dvb->nfeeds--;
  67         if (0 == dvb->nfeeds)
  68                 err = vb2_thread_stop(&dvb->dvbq);
  69         mutex_unlock(&dvb->lock);
  70         return err;
  71 }
  72
  73 static int vb2_dvb_register_adapter(struct vb2_dvb_frontends *fe,
  74                           struct module *module,
  75                           void *adapter_priv,
  76                           struct device *device,
  77                           struct media_device *mdev,
  78                           char *adapter_name,
  79                           short *adapter_nr,
  80                           int mfe_shared)
  81 {
  82         int result;
  83
  84         mutex_init(&fe->lock);
  85
  86         /* register adapter */
  87         result = dvb_register_adapter(&fe->adapter, adapter_name, module,
  88                 device, adapter_nr);
  89         if (result < 0) {
  90                 pr_warn("%s: dvb_register_adapter failed (errno = %d)\n",
  91                        adapter_name, result);
  92         }
  93         fe->adapter.priv = adapter_priv;
  94         fe->adapter.mfe_shared = mfe_shared;
  95 #ifdef CONFIG_MEDIA_CONTROLLER_DVB
  96         if (mdev)
  97                 fe->adapter.mdev = mdev;
  98 #endif
  99         return result;
 100 }
 101
 102 static int vb2_dvb_register_frontend(struct dvb_adapter *adapter,
 103         struct vb2_dvb *dvb)
 104 {
 105         int result;
 106
 107         /* register frontend */
 108         result = dvb_register_frontend(adapter, dvb->frontend);
 109         if (result < 0) {
 110                 pr_warn("%s: dvb_register_frontend failed (errno = %d)\n",
 111                        dvb->name, result);
 112                 goto fail_frontend;
 113         }
 114
 115         /* register demux stuff */
 116         dvb->demux.dmx.capabilities =
 117                 DMX_TS_FILTERING | DMX_SECTION_FILTERING |
 118                 DMX_MEMORY_BASED_FILTERING;
 119         dvb->demux.priv       = dvb;
 120         dvb->demux.filternum  = 256;
 121         dvb->demux.feednum    = 256;
 122         dvb->demux.start_feed = vb2_dvb_start_feed;
 123         dvb->demux.stop_feed  = vb2_dvb_stop_feed;
 124         result = dvb_dmx_init(&dvb->demux);
 125         if (result < 0) {
 126                 pr_warn("%s: dvb_dmx_init failed (errno = %d)\n",
 127                        dvb->name, result);
 128                 goto fail_dmx;
 129         }
 130
 131         dvb->dmxdev.filternum    = 256;
 132         dvb->dmxdev.demux        = &dvb->demux.dmx;
 133         dvb->dmxdev.capabilities = 0;
 134         result = dvb_dmxdev_init(&dvb->dmxdev, adapter);
 135
 136         if (result < 0) {
 137                 pr_warn("%s: dvb_dmxdev_init failed (errno = %d)\n",
 138                        dvb->name, result);
 139                 goto fail_dmxdev;
 140         }
 141
 142         dvb->fe_hw.source = DMX_FRONTEND_0;
 143         result = dvb->demux.dmx.add_frontend(&dvb->demux.dmx, &dvb->fe_hw);
 144         if (result < 0) {
 145                 pr_warn("%s: add_frontend failed (DMX_FRONTEND_0, errno = %d)\n",
 146                        dvb->name, result);
 147                 goto fail_fe_hw;
 148         }
 149
 150         dvb->fe_mem.source = DMX_MEMORY_FE;
 151         result = dvb->demux.dmx.add_frontend(&dvb->demux.dmx, &dvb->fe_mem);
 152         if (result < 0) {
 153                 pr_warn("%s: add_frontend failed (DMX_MEMORY_FE, errno = %d)\n",
 154                        dvb->name, result);
 155                 goto fail_fe_mem;
 156         }
 157
 158         result = dvb->demux.dmx.connect_frontend(&dvb->demux.dmx, &dvb->fe_hw);
 159         if (result < 0) {
 160                 pr_warn("%s: connect_frontend failed (errno = %d)\n",
 161                        dvb->name, result);
 162                 goto fail_fe_conn;
 163         }
 164
 165         /* register network adapter */
 166         result = dvb_net_init(adapter, &dvb->net, &dvb->demux.dmx);
 167         if (result < 0) {
 168                 pr_warn("%s: dvb_net_init failed (errno = %d)\n",
 169                        dvb->name, result);
 170                 goto fail_fe_conn;
 171         }
 172         return 0;
 173
 174 fail_fe_conn:
 175         dvb->demux.dmx.remove_frontend(&dvb->demux.dmx, &dvb->fe_mem);
 176 fail_fe_mem:
 177         dvb->demux.dmx.remove_frontend(&dvb->demux.dmx, &dvb->fe_hw);
 178 fail_fe_hw:
 179         dvb_dmxdev_release(&dvb->dmxdev);
 180 fail_dmxdev:
 181         dvb_dmx_release(&dvb->demux);
 182 fail_dmx:
 183         dvb_unregister_frontend(dvb->frontend);
 184 fail_frontend:
 185         dvb_frontend_detach(dvb->frontend);
 186         dvb->frontend = NULL;
 187
 188         return result;
 189 }
 190
 191 /* ------------------------------------------------------------------ */
 192 /* Register a single adapter and one or more frontends */
 193 int vb2_dvb_register_bus(struct vb2_dvb_frontends *f,
 194                          struct module *module,
 195                          void *adapter_priv,
 196                          struct device *device,
 197                          struct media_device *mdev,
 198                          short *adapter_nr,
 199                          int mfe_shared)
 200 {
 201         struct list_head *list, *q;
 202         struct vb2_dvb_frontend *fe;
 203         int res;
 204
 205         fe = vb2_dvb_get_frontend(f, 1);
 206         if (!fe) {
 207                 pr_warn("Unable to register the adapter which has no frontends\n");
 208                 return -EINVAL;
 209         }
 210
 211         /* Bring up the adapter */
 212         res = vb2_dvb_register_adapter(f, module, adapter_priv, device, mdev,
 213                 fe->dvb.name, adapter_nr, mfe_shared);
 214         if (res < 0) {
 215                 pr_warn("vb2_dvb_register_adapter failed (errno = %d)\n", res);
 216                 return res;
 217         }
 218
 219         /* Attach all of the frontends to the adapter */
 220         mutex_lock(&f->lock);
 221         list_for_each_safe(list, q, &f->felist) {
 222                 fe = list_entry(list, struct vb2_dvb_frontend, felist);
 223                 res = vb2_dvb_register_frontend(&f->adapter, &fe->dvb);
 224                 if (res < 0) {
 225                         pr_warn("%s: vb2_dvb_register_frontend failed (errno = %d)\n",
 226                                 fe->dvb.name, res);
 227                         goto err;
 228                 }
 229                 res = dvb_create_media_graph(&f->adapter, false);
 230                 if (res < 0)
 231                         goto err;
 232         }
 233
 234         mutex_unlock(&f->lock);
 235         return 0;
 236
 237 err:
 238         mutex_unlock(&f->lock);
 239         vb2_dvb_unregister_bus(f);
 240         return res;
 241 }
 242 EXPORT_SYMBOL(vb2_dvb_register_bus);
 243
 244 void vb2_dvb_unregister_bus(struct vb2_dvb_frontends *f)
 245 {
 246         vb2_dvb_dealloc_frontends(f);
 247
 248         dvb_unregister_adapter(&f->adapter);
 249 }
 250 EXPORT_SYMBOL(vb2_dvb_unregister_bus);
 251
 252 struct vb2_dvb_frontend *vb2_dvb_get_frontend(
 253         struct vb2_dvb_frontends *f, int id)
 254 {
 255         struct list_head *list, *q;
 256         struct vb2_dvb_frontend *fe, *ret = NULL;
 257
 258         mutex_lock(&f->lock);
 259
 260         list_for_each_safe(list, q, &f->felist) {
 261                 fe = list_entry(list, struct vb2_dvb_frontend, felist);
 262                 if (fe->id == id) {
 263                         ret = fe;
 264                         break;
 265                 }
 266         }
 267
 268         mutex_unlock(&f->lock);
 269
 270         return ret;
 271 }
 272 EXPORT_SYMBOL(vb2_dvb_get_frontend);
 273
 274 int vb2_dvb_find_frontend(struct vb2_dvb_frontends *f,
 275         struct dvb_frontend *p)
 276 {
 277         struct list_head *list, *q;
 278         struct vb2_dvb_frontend *fe = NULL;
 279         int ret = 0;
 280
 281         mutex_lock(&f->lock);
 282
 283         list_for_each_safe(list, q, &f->felist) {
 284                 fe = list_entry(list, struct vb2_dvb_frontend, felist);
 285                 if (fe->dvb.frontend == p) {
 286                         ret = fe->id;
 287                         break;
 288                 }
 289         }
 290
 291         mutex_unlock(&f->lock);
 292
 293         return ret;
 294 }
 295 EXPORT_SYMBOL(vb2_dvb_find_frontend);
 296
 297 struct vb2_dvb_frontend *vb2_dvb_alloc_frontend(
 298         struct vb2_dvb_frontends *f, int id)
 299 {
 300         struct vb2_dvb_frontend *fe;
 301
 302         fe = kzalloc(sizeof(struct vb2_dvb_frontend), GFP_KERNEL);
 303         if (fe == NULL)
 304                 return NULL;
 305
 306         fe->id = id;
 307         mutex_init(&fe->dvb.lock);
 308
 309         mutex_lock(&f->lock);
 310         list_add_tail(&fe->felist, &f->felist);
 311         mutex_unlock(&f->lock);
 312         return fe;
 313 }
 314 EXPORT_SYMBOL(vb2_dvb_alloc_frontend);
 315
 316 void vb2_dvb_dealloc_frontends(struct vb2_dvb_frontends *f)
 317 {
 318         struct list_head *list, *q;
 319         struct vb2_dvb_frontend *fe;
 320
 321         mutex_lock(&f->lock);
 322         list_for_each_safe(list, q, &f->felist) {
 323                 fe = list_entry(list, struct vb2_dvb_frontend, felist);
 324                 if (fe->dvb.net.dvbdev) {
 325                         dvb_net_release(&fe->dvb.net);
 326                         fe->dvb.demux.dmx.remove_frontend(&fe->dvb.demux.dmx,
 327                                 &fe->dvb.fe_mem);
 328                         fe->dvb.demux.dmx.remove_frontend(&fe->dvb.demux.dmx,
 329                                 &fe->dvb.fe_hw);
 330                         dvb_dmxdev_release(&fe->dvb.dmxdev);
 331                         dvb_dmx_release(&fe->dvb.demux);
 332                         dvb_unregister_frontend(fe->dvb.frontend);
 333                 }
 334                 if (fe->dvb.frontend)
 335                         /* always allocated, may have been reset */
 336                         dvb_frontend_detach(fe->dvb.frontend);
 337                 list_del(list); /* remove list entry */
 338                 kfree(fe);      /* free frontend allocation */
 339         }
 340         mutex_unlock(&f->lock);
 341 }
 342 EXPORT_SYMBOL(vb2_dvb_dealloc_frontends);