videobuf2-dvb.c

  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
 21MODULE_AUTHOR("Gerd Knorr <kraxel@bytesex.org> [SuSE Labs]");
 22MODULE_DESCRIPTION("Videobuf2 helper library for simple DVB cards");
 23MODULE_LICENSE("GPL");
 24
 25/* ------------------------------------------------------------------ */
 26
 27static 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
 36static 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
 59static 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
 73static 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
102static 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
174fail_fe_conn:
175	dvb->demux.dmx.remove_frontend(&dvb->demux.dmx, &dvb->fe_mem);
176fail_fe_mem:
177	dvb->demux.dmx.remove_frontend(&dvb->demux.dmx, &dvb->fe_hw);
178fail_fe_hw:
179	dvb_dmxdev_release(&dvb->dmxdev);
180fail_dmxdev:
181	dvb_dmx_release(&dvb->demux);
182fail_dmx:
183	dvb_unregister_frontend(dvb->frontend);
184fail_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 */
193int 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
237err:
238	mutex_unlock(&f->lock);
239	vb2_dvb_unregister_bus(f);
240	return res;
241}
242EXPORT_SYMBOL(vb2_dvb_register_bus);
243
244void vb2_dvb_unregister_bus(struct vb2_dvb_frontends *f)
245{
246	vb2_dvb_dealloc_frontends(f);
247
248	dvb_unregister_adapter(&f->adapter);
249}
250EXPORT_SYMBOL(vb2_dvb_unregister_bus);
251
252struct 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}
272EXPORT_SYMBOL(vb2_dvb_get_frontend);
273
274int 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}
295EXPORT_SYMBOL(vb2_dvb_find_frontend);
296
297struct 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}
314EXPORT_SYMBOL(vb2_dvb_alloc_frontend);
315
316void 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}
342EXPORT_SYMBOL(vb2_dvb_dealloc_frontends);