1 /*
2 *
3 * some helper function for simple DVB cards which simply DMA the
4 * complete transport stream and let the computer sort everything else
5 * (i.e. we are using the software demux, ...). Also uses the
6 * video-buf to manage DMA buffers.
7 *
8 * (c) 2004 Gerd Knorr <kraxel@bytesex.org> [SUSE Labs]
9 *
10 * This program is free software; you can redistribute it and/or modify
11 * it under the terms of the GNU General Public License as published by
12 * the Free Software Foundation; either version 2 of the License, or
13 * (at your option) any later version.
14 */
15
16 #include <linux/module.h>
17 #include <linux/init.h>
18 #include <linux/device.h>
19 #include <linux/slab.h>
20
21 #include <media/videobuf2-dvb.h>
22
23 /* ------------------------------------------------------------------ */
24
25 MODULE_AUTHOR("Gerd Knorr <kraxel@bytesex.org> [SuSE Labs]");
26 MODULE_LICENSE("GPL");
27
28 /* ------------------------------------------------------------------ */
29
dvb_fnc(struct vb2_buffer * vb,void * priv)30 static int dvb_fnc(struct vb2_buffer *vb, void *priv)
31 {
32 struct vb2_dvb *dvb = priv;
33
34 dvb_dmx_swfilter(&dvb->demux, vb2_plane_vaddr(vb, 0),
35 vb2_get_plane_payload(vb, 0));
36 return 0;
37 }
38
vb2_dvb_start_feed(struct dvb_demux_feed * feed)39 static int vb2_dvb_start_feed(struct dvb_demux_feed *feed)
40 {
41 struct dvb_demux *demux = feed->demux;
42 struct vb2_dvb *dvb = demux->priv;
43 int rc = 0;
44
45 if (!demux->dmx.frontend)
46 return -EINVAL;
47
48 mutex_lock(&dvb->lock);
49 dvb->nfeeds++;
50
51 if (!dvb->dvbq.threadio) {
52 rc = vb2_thread_start(&dvb->dvbq, dvb_fnc, dvb, dvb->name);
53 if (rc)
54 dvb->nfeeds--;
55 }
56 if (!rc)
57 rc = dvb->nfeeds;
58 mutex_unlock(&dvb->lock);
59 return rc;
60 }
61
vb2_dvb_stop_feed(struct dvb_demux_feed * feed)62 static int vb2_dvb_stop_feed(struct dvb_demux_feed *feed)
63 {
64 struct dvb_demux *demux = feed->demux;
65 struct vb2_dvb *dvb = demux->priv;
66 int err = 0;
67
68 mutex_lock(&dvb->lock);
69 dvb->nfeeds--;
70 if (0 == dvb->nfeeds)
71 err = vb2_thread_stop(&dvb->dvbq);
72 mutex_unlock(&dvb->lock);
73 return err;
74 }
75
vb2_dvb_register_adapter(struct vb2_dvb_frontends * fe,struct module * module,void * adapter_priv,struct device * device,char * adapter_name,short * adapter_nr,int mfe_shared)76 static int vb2_dvb_register_adapter(struct vb2_dvb_frontends *fe,
77 struct module *module,
78 void *adapter_priv,
79 struct device *device,
80 char *adapter_name,
81 short *adapter_nr,
82 int mfe_shared)
83 {
84 int result;
85
86 mutex_init(&fe->lock);
87
88 /* register adapter */
89 result = dvb_register_adapter(&fe->adapter, adapter_name, module,
90 device, adapter_nr);
91 if (result < 0) {
92 pr_warn("%s: dvb_register_adapter failed (errno = %d)\n",
93 adapter_name, result);
94 }
95 fe->adapter.priv = adapter_priv;
96 fe->adapter.mfe_shared = mfe_shared;
97
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,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 short *adapter_nr,
197 int mfe_shared)
198 {
199 struct list_head *list, *q;
200 struct vb2_dvb_frontend *fe;
201 int res;
202
203 fe = vb2_dvb_get_frontend(f, 1);
204 if (!fe) {
205 pr_warn("Unable to register the adapter which has no frontends\n");
206 return -EINVAL;
207 }
208
209 /* Bring up the adapter */
210 res = vb2_dvb_register_adapter(f, module, adapter_priv, device,
211 fe->dvb.name, adapter_nr, mfe_shared);
212 if (res < 0) {
213 pr_warn("vb2_dvb_register_adapter failed (errno = %d)\n", res);
214 return res;
215 }
216
217 /* Attach all of the frontends to the adapter */
218 mutex_lock(&f->lock);
219 list_for_each_safe(list, q, &f->felist) {
220 fe = list_entry(list, struct vb2_dvb_frontend, felist);
221 res = vb2_dvb_register_frontend(&f->adapter, &fe->dvb);
222 if (res < 0) {
223 pr_warn("%s: vb2_dvb_register_frontend failed (errno = %d)\n",
224 fe->dvb.name, res);
225 goto err;
226 }
227 }
228 mutex_unlock(&f->lock);
229 return 0;
230
231 err:
232 mutex_unlock(&f->lock);
233 vb2_dvb_unregister_bus(f);
234 return res;
235 }
236 EXPORT_SYMBOL(vb2_dvb_register_bus);
237
vb2_dvb_unregister_bus(struct vb2_dvb_frontends * f)238 void vb2_dvb_unregister_bus(struct vb2_dvb_frontends *f)
239 {
240 vb2_dvb_dealloc_frontends(f);
241
242 dvb_unregister_adapter(&f->adapter);
243 }
244 EXPORT_SYMBOL(vb2_dvb_unregister_bus);
245
vb2_dvb_get_frontend(struct vb2_dvb_frontends * f,int id)246 struct vb2_dvb_frontend *vb2_dvb_get_frontend(
247 struct vb2_dvb_frontends *f, int id)
248 {
249 struct list_head *list, *q;
250 struct vb2_dvb_frontend *fe, *ret = NULL;
251
252 mutex_lock(&f->lock);
253
254 list_for_each_safe(list, q, &f->felist) {
255 fe = list_entry(list, struct vb2_dvb_frontend, felist);
256 if (fe->id == id) {
257 ret = fe;
258 break;
259 }
260 }
261
262 mutex_unlock(&f->lock);
263
264 return ret;
265 }
266 EXPORT_SYMBOL(vb2_dvb_get_frontend);
267
vb2_dvb_find_frontend(struct vb2_dvb_frontends * f,struct dvb_frontend * p)268 int vb2_dvb_find_frontend(struct vb2_dvb_frontends *f,
269 struct dvb_frontend *p)
270 {
271 struct list_head *list, *q;
272 struct vb2_dvb_frontend *fe = NULL;
273 int ret = 0;
274
275 mutex_lock(&f->lock);
276
277 list_for_each_safe(list, q, &f->felist) {
278 fe = list_entry(list, struct vb2_dvb_frontend, felist);
279 if (fe->dvb.frontend == p) {
280 ret = fe->id;
281 break;
282 }
283 }
284
285 mutex_unlock(&f->lock);
286
287 return ret;
288 }
289 EXPORT_SYMBOL(vb2_dvb_find_frontend);
290
vb2_dvb_alloc_frontend(struct vb2_dvb_frontends * f,int id)291 struct vb2_dvb_frontend *vb2_dvb_alloc_frontend(
292 struct vb2_dvb_frontends *f, int id)
293 {
294 struct vb2_dvb_frontend *fe;
295
296 fe = kzalloc(sizeof(struct vb2_dvb_frontend), GFP_KERNEL);
297 if (fe == NULL)
298 return NULL;
299
300 fe->id = id;
301 mutex_init(&fe->dvb.lock);
302
303 mutex_lock(&f->lock);
304 list_add_tail(&fe->felist, &f->felist);
305 mutex_unlock(&f->lock);
306 return fe;
307 }
308 EXPORT_SYMBOL(vb2_dvb_alloc_frontend);
309
vb2_dvb_dealloc_frontends(struct vb2_dvb_frontends * f)310 void vb2_dvb_dealloc_frontends(struct vb2_dvb_frontends *f)
311 {
312 struct list_head *list, *q;
313 struct vb2_dvb_frontend *fe;
314
315 mutex_lock(&f->lock);
316 list_for_each_safe(list, q, &f->felist) {
317 fe = list_entry(list, struct vb2_dvb_frontend, felist);
318 if (fe->dvb.net.dvbdev) {
319 dvb_net_release(&fe->dvb.net);
320 fe->dvb.demux.dmx.remove_frontend(&fe->dvb.demux.dmx,
321 &fe->dvb.fe_mem);
322 fe->dvb.demux.dmx.remove_frontend(&fe->dvb.demux.dmx,
323 &fe->dvb.fe_hw);
324 dvb_dmxdev_release(&fe->dvb.dmxdev);
325 dvb_dmx_release(&fe->dvb.demux);
326 dvb_unregister_frontend(fe->dvb.frontend);
327 }
328 if (fe->dvb.frontend)
329 /* always allocated, may have been reset */
330 dvb_frontend_detach(fe->dvb.frontend);
331 list_del(list); /* remove list entry */
332 kfree(fe); /* free frontend allocation */
333 }
334 mutex_unlock(&f->lock);
335 }
336 EXPORT_SYMBOL(vb2_dvb_dealloc_frontends);
337