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