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
21 MODULE_AUTHOR("Gerd Knorr <kraxel@bytesex.org> [SuSE Labs]");
22 MODULE_LICENSE("GPL");
23
24 /* ------------------------------------------------------------------ */
25
dvb_fnc(struct vb2_buffer * vb,void * priv)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
vb2_dvb_start_feed(struct dvb_demux_feed * feed)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
vb2_dvb_stop_feed(struct dvb_demux_feed * feed)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
vb2_dvb_register_adapter(struct vb2_dvb_frontends * fe,struct module * module,void * adapter_priv,struct device * device,struct media_device * mdev,char * adapter_name,short * adapter_nr,int mfe_shared)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
vb2_dvb_register_frontend(struct dvb_adapter * adapter,struct vb2_dvb * dvb)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 */
vb2_dvb_register_bus(struct vb2_dvb_frontends * f,struct module * module,void * adapter_priv,struct device * device,struct media_device * mdev,short * adapter_nr,int mfe_shared)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
vb2_dvb_unregister_bus(struct vb2_dvb_frontends * f)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
vb2_dvb_get_frontend(struct vb2_dvb_frontends * f,int id)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
vb2_dvb_find_frontend(struct vb2_dvb_frontends * f,struct dvb_frontend * p)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
vb2_dvb_alloc_frontend(struct vb2_dvb_frontends * f,int id)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
vb2_dvb_dealloc_frontends(struct vb2_dvb_frontends * f)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