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
dvb_fnc(struct vb2_buffer * vb,void * priv)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
vb2_dvb_start_feed(struct dvb_demux_feed * feed)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
vb2_dvb_stop_feed(struct dvb_demux_feed * feed)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
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)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
vb2_dvb_register_frontend(struct dvb_adapter * adapter,struct vb2_dvb * dvb)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 */
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)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
vb2_dvb_unregister_bus(struct vb2_dvb_frontends * f)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
vb2_dvb_get_frontend(struct vb2_dvb_frontends * f,int id)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
vb2_dvb_find_frontend(struct vb2_dvb_frontends * f,struct dvb_frontend * p)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
vb2_dvb_alloc_frontend(struct vb2_dvb_frontends * f,int id)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
vb2_dvb_dealloc_frontends(struct vb2_dvb_frontends * f)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);
343