Back to home page

OSCL-LXR
 
 

     

0001 // SPDX-License-Identifier: GPL-2.0-or-later
0002 /*
0003  *
0004  * some helper function for simple DVB cards which simply DMA the
0005  * complete transport stream and let the computer sort everything else
0006  * (i.e. we are using the software demux, ...).  Also uses the
0007  * video-buf to manage DMA buffers.
0008  *
0009  * (c) 2004 Gerd Knorr <kraxel@bytesex.org> [SUSE Labs]
0010  */
0011 
0012 #include <linux/module.h>
0013 #include <linux/init.h>
0014 #include <linux/device.h>
0015 #include <linux/slab.h>
0016 
0017 #include <media/videobuf2-dvb.h>
0018 
0019 /* ------------------------------------------------------------------ */
0020 
0021 MODULE_AUTHOR("Gerd Knorr <kraxel@bytesex.org> [SuSE Labs]");
0022 MODULE_LICENSE("GPL");
0023 
0024 /* ------------------------------------------------------------------ */
0025 
0026 static int dvb_fnc(struct vb2_buffer *vb, void *priv)
0027 {
0028     struct vb2_dvb *dvb = priv;
0029 
0030     dvb_dmx_swfilter(&dvb->demux, vb2_plane_vaddr(vb, 0),
0031                       vb2_get_plane_payload(vb, 0));
0032     return 0;
0033 }
0034 
0035 static int vb2_dvb_start_feed(struct dvb_demux_feed *feed)
0036 {
0037     struct dvb_demux *demux = feed->demux;
0038     struct vb2_dvb *dvb = demux->priv;
0039     int rc = 0;
0040 
0041     if (!demux->dmx.frontend)
0042         return -EINVAL;
0043 
0044     mutex_lock(&dvb->lock);
0045     dvb->nfeeds++;
0046 
0047     if (!dvb->dvbq.threadio) {
0048         rc = vb2_thread_start(&dvb->dvbq, dvb_fnc, dvb, dvb->name);
0049         if (rc)
0050             dvb->nfeeds--;
0051     }
0052     if (!rc)
0053         rc = dvb->nfeeds;
0054     mutex_unlock(&dvb->lock);
0055     return rc;
0056 }
0057 
0058 static int vb2_dvb_stop_feed(struct dvb_demux_feed *feed)
0059 {
0060     struct dvb_demux *demux = feed->demux;
0061     struct vb2_dvb *dvb = demux->priv;
0062     int err = 0;
0063 
0064     mutex_lock(&dvb->lock);
0065     dvb->nfeeds--;
0066     if (0 == dvb->nfeeds)
0067         err = vb2_thread_stop(&dvb->dvbq);
0068     mutex_unlock(&dvb->lock);
0069     return err;
0070 }
0071 
0072 static int vb2_dvb_register_adapter(struct vb2_dvb_frontends *fe,
0073               struct module *module,
0074               void *adapter_priv,
0075               struct device *device,
0076               struct media_device *mdev,
0077               char *adapter_name,
0078               short *adapter_nr,
0079               int mfe_shared)
0080 {
0081     int result;
0082 
0083     mutex_init(&fe->lock);
0084 
0085     /* register adapter */
0086     result = dvb_register_adapter(&fe->adapter, adapter_name, module,
0087         device, adapter_nr);
0088     if (result < 0) {
0089         pr_warn("%s: dvb_register_adapter failed (errno = %d)\n",
0090                adapter_name, result);
0091     }
0092     fe->adapter.priv = adapter_priv;
0093     fe->adapter.mfe_shared = mfe_shared;
0094 #ifdef CONFIG_MEDIA_CONTROLLER_DVB
0095     if (mdev)
0096         fe->adapter.mdev = mdev;
0097 #endif
0098     return result;
0099 }
0100 
0101 static int vb2_dvb_register_frontend(struct dvb_adapter *adapter,
0102     struct vb2_dvb *dvb)
0103 {
0104     int result;
0105 
0106     /* register frontend */
0107     result = dvb_register_frontend(adapter, dvb->frontend);
0108     if (result < 0) {
0109         pr_warn("%s: dvb_register_frontend failed (errno = %d)\n",
0110                dvb->name, result);
0111         goto fail_frontend;
0112     }
0113 
0114     /* register demux stuff */
0115     dvb->demux.dmx.capabilities =
0116         DMX_TS_FILTERING | DMX_SECTION_FILTERING |
0117         DMX_MEMORY_BASED_FILTERING;
0118     dvb->demux.priv       = dvb;
0119     dvb->demux.filternum  = 256;
0120     dvb->demux.feednum    = 256;
0121     dvb->demux.start_feed = vb2_dvb_start_feed;
0122     dvb->demux.stop_feed  = vb2_dvb_stop_feed;
0123     result = dvb_dmx_init(&dvb->demux);
0124     if (result < 0) {
0125         pr_warn("%s: dvb_dmx_init failed (errno = %d)\n",
0126                dvb->name, result);
0127         goto fail_dmx;
0128     }
0129 
0130     dvb->dmxdev.filternum    = 256;
0131     dvb->dmxdev.demux        = &dvb->demux.dmx;
0132     dvb->dmxdev.capabilities = 0;
0133     result = dvb_dmxdev_init(&dvb->dmxdev, adapter);
0134 
0135     if (result < 0) {
0136         pr_warn("%s: dvb_dmxdev_init failed (errno = %d)\n",
0137                dvb->name, result);
0138         goto fail_dmxdev;
0139     }
0140 
0141     dvb->fe_hw.source = DMX_FRONTEND_0;
0142     result = dvb->demux.dmx.add_frontend(&dvb->demux.dmx, &dvb->fe_hw);
0143     if (result < 0) {
0144         pr_warn("%s: add_frontend failed (DMX_FRONTEND_0, errno = %d)\n",
0145                dvb->name, result);
0146         goto fail_fe_hw;
0147     }
0148 
0149     dvb->fe_mem.source = DMX_MEMORY_FE;
0150     result = dvb->demux.dmx.add_frontend(&dvb->demux.dmx, &dvb->fe_mem);
0151     if (result < 0) {
0152         pr_warn("%s: add_frontend failed (DMX_MEMORY_FE, errno = %d)\n",
0153                dvb->name, result);
0154         goto fail_fe_mem;
0155     }
0156 
0157     result = dvb->demux.dmx.connect_frontend(&dvb->demux.dmx, &dvb->fe_hw);
0158     if (result < 0) {
0159         pr_warn("%s: connect_frontend failed (errno = %d)\n",
0160                dvb->name, result);
0161         goto fail_fe_conn;
0162     }
0163 
0164     /* register network adapter */
0165     result = dvb_net_init(adapter, &dvb->net, &dvb->demux.dmx);
0166     if (result < 0) {
0167         pr_warn("%s: dvb_net_init failed (errno = %d)\n",
0168                dvb->name, result);
0169         goto fail_fe_conn;
0170     }
0171     return 0;
0172 
0173 fail_fe_conn:
0174     dvb->demux.dmx.remove_frontend(&dvb->demux.dmx, &dvb->fe_mem);
0175 fail_fe_mem:
0176     dvb->demux.dmx.remove_frontend(&dvb->demux.dmx, &dvb->fe_hw);
0177 fail_fe_hw:
0178     dvb_dmxdev_release(&dvb->dmxdev);
0179 fail_dmxdev:
0180     dvb_dmx_release(&dvb->demux);
0181 fail_dmx:
0182     dvb_unregister_frontend(dvb->frontend);
0183 fail_frontend:
0184     dvb_frontend_detach(dvb->frontend);
0185     dvb->frontend = NULL;
0186 
0187     return result;
0188 }
0189 
0190 /* ------------------------------------------------------------------ */
0191 /* Register a single adapter and one or more frontends */
0192 int vb2_dvb_register_bus(struct vb2_dvb_frontends *f,
0193              struct module *module,
0194              void *adapter_priv,
0195              struct device *device,
0196              struct media_device *mdev,
0197              short *adapter_nr,
0198              int mfe_shared)
0199 {
0200     struct list_head *list, *q;
0201     struct vb2_dvb_frontend *fe;
0202     int res;
0203 
0204     fe = vb2_dvb_get_frontend(f, 1);
0205     if (!fe) {
0206         pr_warn("Unable to register the adapter which has no frontends\n");
0207         return -EINVAL;
0208     }
0209 
0210     /* Bring up the adapter */
0211     res = vb2_dvb_register_adapter(f, module, adapter_priv, device, mdev,
0212         fe->dvb.name, adapter_nr, mfe_shared);
0213     if (res < 0) {
0214         pr_warn("vb2_dvb_register_adapter failed (errno = %d)\n", res);
0215         return res;
0216     }
0217 
0218     /* Attach all of the frontends to the adapter */
0219     mutex_lock(&f->lock);
0220     list_for_each_safe(list, q, &f->felist) {
0221         fe = list_entry(list, struct vb2_dvb_frontend, felist);
0222         res = vb2_dvb_register_frontend(&f->adapter, &fe->dvb);
0223         if (res < 0) {
0224             pr_warn("%s: vb2_dvb_register_frontend failed (errno = %d)\n",
0225                 fe->dvb.name, res);
0226             goto err;
0227         }
0228         res = dvb_create_media_graph(&f->adapter, false);
0229         if (res < 0)
0230             goto err;
0231     }
0232 
0233     mutex_unlock(&f->lock);
0234     return 0;
0235 
0236 err:
0237     mutex_unlock(&f->lock);
0238     vb2_dvb_unregister_bus(f);
0239     return res;
0240 }
0241 EXPORT_SYMBOL(vb2_dvb_register_bus);
0242 
0243 void vb2_dvb_unregister_bus(struct vb2_dvb_frontends *f)
0244 {
0245     vb2_dvb_dealloc_frontends(f);
0246 
0247     dvb_unregister_adapter(&f->adapter);
0248 }
0249 EXPORT_SYMBOL(vb2_dvb_unregister_bus);
0250 
0251 struct vb2_dvb_frontend *vb2_dvb_get_frontend(
0252     struct vb2_dvb_frontends *f, int id)
0253 {
0254     struct list_head *list, *q;
0255     struct vb2_dvb_frontend *fe, *ret = NULL;
0256 
0257     mutex_lock(&f->lock);
0258 
0259     list_for_each_safe(list, q, &f->felist) {
0260         fe = list_entry(list, struct vb2_dvb_frontend, felist);
0261         if (fe->id == id) {
0262             ret = fe;
0263             break;
0264         }
0265     }
0266 
0267     mutex_unlock(&f->lock);
0268 
0269     return ret;
0270 }
0271 EXPORT_SYMBOL(vb2_dvb_get_frontend);
0272 
0273 int vb2_dvb_find_frontend(struct vb2_dvb_frontends *f,
0274     struct dvb_frontend *p)
0275 {
0276     struct list_head *list, *q;
0277     struct vb2_dvb_frontend *fe = NULL;
0278     int ret = 0;
0279 
0280     mutex_lock(&f->lock);
0281 
0282     list_for_each_safe(list, q, &f->felist) {
0283         fe = list_entry(list, struct vb2_dvb_frontend, felist);
0284         if (fe->dvb.frontend == p) {
0285             ret = fe->id;
0286             break;
0287         }
0288     }
0289 
0290     mutex_unlock(&f->lock);
0291 
0292     return ret;
0293 }
0294 EXPORT_SYMBOL(vb2_dvb_find_frontend);
0295 
0296 struct vb2_dvb_frontend *vb2_dvb_alloc_frontend(
0297     struct vb2_dvb_frontends *f, int id)
0298 {
0299     struct vb2_dvb_frontend *fe;
0300 
0301     fe = kzalloc(sizeof(struct vb2_dvb_frontend), GFP_KERNEL);
0302     if (fe == NULL)
0303         return NULL;
0304 
0305     fe->id = id;
0306     mutex_init(&fe->dvb.lock);
0307 
0308     mutex_lock(&f->lock);
0309     list_add_tail(&fe->felist, &f->felist);
0310     mutex_unlock(&f->lock);
0311     return fe;
0312 }
0313 EXPORT_SYMBOL(vb2_dvb_alloc_frontend);
0314 
0315 void vb2_dvb_dealloc_frontends(struct vb2_dvb_frontends *f)
0316 {
0317     struct list_head *list, *q;
0318     struct vb2_dvb_frontend *fe;
0319 
0320     mutex_lock(&f->lock);
0321     list_for_each_safe(list, q, &f->felist) {
0322         fe = list_entry(list, struct vb2_dvb_frontend, felist);
0323         if (fe->dvb.net.dvbdev) {
0324             dvb_net_release(&fe->dvb.net);
0325             fe->dvb.demux.dmx.remove_frontend(&fe->dvb.demux.dmx,
0326                 &fe->dvb.fe_mem);
0327             fe->dvb.demux.dmx.remove_frontend(&fe->dvb.demux.dmx,
0328                 &fe->dvb.fe_hw);
0329             dvb_dmxdev_release(&fe->dvb.dmxdev);
0330             dvb_dmx_release(&fe->dvb.demux);
0331             dvb_unregister_frontend(fe->dvb.frontend);
0332         }
0333         if (fe->dvb.frontend)
0334             /* always allocated, may have been reset */
0335             dvb_frontend_detach(fe->dvb.frontend);
0336         list_del(list); /* remove list entry */
0337         kfree(fe);  /* free frontend allocation */
0338     }
0339     mutex_unlock(&f->lock);
0340 }
0341 EXPORT_SYMBOL(vb2_dvb_dealloc_frontends);
[ Source navigation ] [ Diff markup ] [ Identifier search ] [ general search ]

This page was automatically generated by the 2.1.0 LXR engine.

The LXR team
Valid CSS 2.1! Valid HTML 4.01!