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_LICENSE("GPL"); 23 24 /* ------------------------------------------------------------------ */ 25 26 static 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 35 static 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 58 static 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 72 static 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 } 100 101 static 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; 172 173 fail_fe_conn: 174 dvb->demux.dmx.remove_frontend(&dvb->demux.dmx, &dvb->fe_mem); 175 fail_fe_mem: 176 dvb->demux.dmx.remove_frontend(&dvb->demux.dmx, &dvb->fe_hw); 177 fail_fe_hw: 178 dvb_dmxdev_release(&dvb->dmxdev); 179 fail_dmxdev: 180 dvb_dmx_release(&dvb->demux); 181 fail_dmx: 182 dvb_unregister_frontend(dvb->frontend); 183 fail_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 */ 192 int 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; 235 236 err: 237 mutex_unlock(&f->lock); 238 vb2_dvb_unregister_bus(f); 239 return res; 240 } 241 EXPORT_SYMBOL(vb2_dvb_register_bus); 242 243 void vb2_dvb_unregister_bus(struct vb2_dvb_frontends *f) 244 { 245 vb2_dvb_dealloc_frontends(f); 246 247 dvb_unregister_adapter(&f->adapter); 248 } 249 EXPORT_SYMBOL(vb2_dvb_unregister_bus); 250 251 struct 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 } 271 EXPORT_SYMBOL(vb2_dvb_get_frontend); 272 273 int 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 } 294 EXPORT_SYMBOL(vb2_dvb_find_frontend); 295 296 struct 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 } 313 EXPORT_SYMBOL(vb2_dvb_alloc_frontend); 314 315 void 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 } 341 EXPORT_SYMBOL(vb2_dvb_dealloc_frontends); 342