1// SPDX-License-Identifier: GPL-2.0-only
2/*
3 *  pvrusb2-dvb.c - linux-dvb api interface to the pvrusb2 driver.
4 *
5 *  Copyright (C) 2007, 2008 Michael Krufky <mkrufky@linuxtv.org>
6 */
7
8#include <linux/kthread.h>
9#include <linux/freezer.h>
10#include <linux/slab.h>
11#include <linux/mm.h>
12#include <media/dvbdev.h>
13#include "pvrusb2-debug.h"
14#include "pvrusb2-hdw-internal.h"
15#include "pvrusb2-hdw.h"
16#include "pvrusb2-io.h"
17#include "pvrusb2-dvb.h"
18
19DVB_DEFINE_MOD_OPT_ADAPTER_NR(adapter_nr);
20
21static int pvr2_dvb_feed_func(struct pvr2_dvb_adapter *adap)
22{
23	int ret;
24	unsigned int count;
25	struct pvr2_buffer *bp;
26	struct pvr2_stream *stream;
27
28	pvr2_trace(PVR2_TRACE_DVB_FEED, "dvb feed thread started");
29	set_freezable();
30
31	stream = adap->channel.stream->stream;
32
33	for (;;) {
34		if (kthread_should_stop()) break;
35
36		/* Not sure about this... */
37		try_to_freeze();
38
39		bp = pvr2_stream_get_ready_buffer(stream);
40		if (bp != NULL) {
41			count = pvr2_buffer_get_count(bp);
42			if (count) {
43				dvb_dmx_swfilter(
44					&adap->demux,
45					adap->buffer_storage[
46					    pvr2_buffer_get_id(bp)],
47					count);
48			} else {
49				ret = pvr2_buffer_get_status(bp);
50				if (ret < 0) break;
51			}
52			ret = pvr2_buffer_queue(bp);
53			if (ret < 0) break;
54
55			/* Since we know we did something to a buffer,
56			   just go back and try again.  No point in
57			   blocking unless we really ran out of
58			   buffers to process. */
59			continue;
60		}
61
62
63		/* Wait until more buffers become available or we're
64		   told not to wait any longer. */
65		ret = wait_event_interruptible(
66		    adap->buffer_wait_data,
67		    (pvr2_stream_get_ready_count(stream) > 0) ||
68		    kthread_should_stop());
69		if (ret < 0) break;
70	}
71
72	/* If we get here and ret is < 0, then an error has occurred.
73	   Probably would be a good idea to communicate that to DVB core... */
74
75	pvr2_trace(PVR2_TRACE_DVB_FEED, "dvb feed thread stopped");
76
77	return 0;
78}
79
80static int pvr2_dvb_feed_thread(void *data)
81{
82	int stat = pvr2_dvb_feed_func(data);
83
84	while (!kthread_should_stop()) {
85		set_current_state(TASK_INTERRUPTIBLE);
86		schedule();
87	}
88	return stat;
89}
90
91static void pvr2_dvb_notify(void *ptr)
92{
93	struct pvr2_dvb_adapter *adap = ptr;
94
95	wake_up(&adap->buffer_wait_data);
96}
97
98static void pvr2_dvb_stream_end(struct pvr2_dvb_adapter *adap)
99{
100	unsigned int idx;
101	struct pvr2_stream *stream;
102
103	if (adap->thread) {
104		kthread_stop(adap->thread);
105		adap->thread = NULL;
106	}
107
108	if (adap->channel.stream) {
109		stream = adap->channel.stream->stream;
110	} else {
111		stream = NULL;
112	}
113	if (stream) {
114		pvr2_hdw_set_streaming(adap->channel.hdw, 0);
115		pvr2_stream_set_callback(stream, NULL, NULL);
116		pvr2_stream_kill(stream);
117		pvr2_stream_set_buffer_count(stream, 0);
118		pvr2_channel_claim_stream(&adap->channel, NULL);
119	}
120
121	if (adap->stream_run) {
122		for (idx = 0; idx < PVR2_DVB_BUFFER_COUNT; idx++) {
123			if (!(adap->buffer_storage[idx])) continue;
124			kfree(adap->buffer_storage[idx]);
125			adap->buffer_storage[idx] = NULL;
126		}
127		adap->stream_run = 0;
128	}
129}
130
131static int pvr2_dvb_stream_do_start(struct pvr2_dvb_adapter *adap)
132{
133	struct pvr2_context *pvr = adap->channel.mc_head;
134	unsigned int idx;
135	int ret;
136	struct pvr2_buffer *bp;
137	struct pvr2_stream *stream = NULL;
138
139	if (adap->stream_run) return -EIO;
140
141	ret = pvr2_channel_claim_stream(&adap->channel, &pvr->video_stream);
142	/* somebody else already has the stream */
143	if (ret < 0) return ret;
144
145	stream = adap->channel.stream->stream;
146
147	for (idx = 0; idx < PVR2_DVB_BUFFER_COUNT; idx++) {
148		adap->buffer_storage[idx] = kmalloc(PVR2_DVB_BUFFER_SIZE,
149						    GFP_KERNEL);
150		if (!(adap->buffer_storage[idx])) return -ENOMEM;
151	}
152
153	pvr2_stream_set_callback(pvr->video_stream.stream,
154				 pvr2_dvb_notify, adap);
155
156	ret = pvr2_stream_set_buffer_count(stream, PVR2_DVB_BUFFER_COUNT);
157	if (ret < 0) return ret;
158
159	for (idx = 0; idx < PVR2_DVB_BUFFER_COUNT; idx++) {
160		bp = pvr2_stream_get_buffer(stream, idx);
161		pvr2_buffer_set_buffer(bp,
162				       adap->buffer_storage[idx],
163				       PVR2_DVB_BUFFER_SIZE);
164	}
165
166	ret = pvr2_hdw_set_streaming(adap->channel.hdw, 1);
167	if (ret < 0) return ret;
168
169	while ((bp = pvr2_stream_get_idle_buffer(stream)) != NULL) {
170		ret = pvr2_buffer_queue(bp);
171		if (ret < 0) return ret;
172	}
173
174	adap->thread = kthread_run(pvr2_dvb_feed_thread, adap, "pvrusb2-dvb");
175
176	if (IS_ERR(adap->thread)) {
177		ret = PTR_ERR(adap->thread);
178		adap->thread = NULL;
179		return ret;
180	}
181
182	adap->stream_run = !0;
183
184	return 0;
185}
186
187static int pvr2_dvb_stream_start(struct pvr2_dvb_adapter *adap)
188{
189	int ret = pvr2_dvb_stream_do_start(adap);
190	if (ret < 0) pvr2_dvb_stream_end(adap);
191	return ret;
192}
193
194static int pvr2_dvb_ctrl_feed(struct dvb_demux_feed *dvbdmxfeed, int onoff)
195{
196	struct pvr2_dvb_adapter *adap = dvbdmxfeed->demux->priv;
197	int ret = 0;
198
199	if (adap == NULL) return -ENODEV;
200
201	mutex_lock(&adap->lock);
202	do {
203		if (onoff) {
204			if (!adap->feedcount) {
205				pvr2_trace(PVR2_TRACE_DVB_FEED,
206					   "start feeding demux");
207				ret = pvr2_dvb_stream_start(adap);
208				if (ret < 0) break;
209			}
210			(adap->feedcount)++;
211		} else if (adap->feedcount > 0) {
212			(adap->feedcount)--;
213			if (!adap->feedcount) {
214				pvr2_trace(PVR2_TRACE_DVB_FEED,
215					   "stop feeding demux");
216				pvr2_dvb_stream_end(adap);
217			}
218		}
219	} while (0);
220	mutex_unlock(&adap->lock);
221
222	return ret;
223}
224
225static int pvr2_dvb_start_feed(struct dvb_demux_feed *dvbdmxfeed)
226{
227	pvr2_trace(PVR2_TRACE_DVB_FEED, "start pid: 0x%04x", dvbdmxfeed->pid);
228	return pvr2_dvb_ctrl_feed(dvbdmxfeed, 1);
229}
230
231static int pvr2_dvb_stop_feed(struct dvb_demux_feed *dvbdmxfeed)
232{
233	pvr2_trace(PVR2_TRACE_DVB_FEED, "stop pid: 0x%04x", dvbdmxfeed->pid);
234	return pvr2_dvb_ctrl_feed(dvbdmxfeed, 0);
235}
236
237static int pvr2_dvb_bus_ctrl(struct dvb_frontend *fe, int acquire)
238{
239	struct pvr2_dvb_adapter *adap = fe->dvb->priv;
240	return pvr2_channel_limit_inputs(
241	    &adap->channel,
242	    (acquire ? (1 << PVR2_CVAL_INPUT_DTV) : 0));
243}
244
245static int pvr2_dvb_adapter_init(struct pvr2_dvb_adapter *adap)
246{
247	int ret;
248
249	ret = dvb_register_adapter(&adap->dvb_adap, "pvrusb2-dvb",
250				   THIS_MODULE/*&hdw->usb_dev->owner*/,
251				   &adap->channel.hdw->usb_dev->dev,
252				   adapter_nr);
253	if (ret < 0) {
254		pvr2_trace(PVR2_TRACE_ERROR_LEGS,
255			   "dvb_register_adapter failed: error %d", ret);
256		goto err;
257	}
258	adap->dvb_adap.priv = adap;
259
260	adap->demux.dmx.capabilities = DMX_TS_FILTERING |
261				       DMX_SECTION_FILTERING |
262				       DMX_MEMORY_BASED_FILTERING;
263	adap->demux.priv             = adap;
264	adap->demux.filternum        = 256;
265	adap->demux.feednum          = 256;
266	adap->demux.start_feed       = pvr2_dvb_start_feed;
267	adap->demux.stop_feed        = pvr2_dvb_stop_feed;
268	adap->demux.write_to_decoder = NULL;
269
270	ret = dvb_dmx_init(&adap->demux);
271	if (ret < 0) {
272		pvr2_trace(PVR2_TRACE_ERROR_LEGS,
273			   "dvb_dmx_init failed: error %d", ret);
274		goto err_dmx;
275	}
276
277	adap->dmxdev.filternum       = adap->demux.filternum;
278	adap->dmxdev.demux           = &adap->demux.dmx;
279	adap->dmxdev.capabilities    = 0;
280
281	ret = dvb_dmxdev_init(&adap->dmxdev, &adap->dvb_adap);
282	if (ret < 0) {
283		pvr2_trace(PVR2_TRACE_ERROR_LEGS,
284			   "dvb_dmxdev_init failed: error %d", ret);
285		goto err_dmx_dev;
286	}
287
288	dvb_net_init(&adap->dvb_adap, &adap->dvb_net, &adap->demux.dmx);
289
290	return 0;
291
292err_dmx_dev:
293	dvb_dmx_release(&adap->demux);
294err_dmx:
295	dvb_unregister_adapter(&adap->dvb_adap);
296err:
297	return ret;
298}
299
300static int pvr2_dvb_adapter_exit(struct pvr2_dvb_adapter *adap)
301{
302	pvr2_trace(PVR2_TRACE_INFO, "unregistering DVB devices");
303	dvb_net_release(&adap->dvb_net);
304	adap->demux.dmx.close(&adap->demux.dmx);
305	dvb_dmxdev_release(&adap->dmxdev);
306	dvb_dmx_release(&adap->demux);
307	dvb_unregister_adapter(&adap->dvb_adap);
308	return 0;
309}
310
311static int pvr2_dvb_frontend_init(struct pvr2_dvb_adapter *adap)
312{
313	struct pvr2_hdw *hdw = adap->channel.hdw;
314	const struct pvr2_dvb_props *dvb_props = hdw->hdw_desc->dvb_props;
315	int ret = 0;
316
317	if (dvb_props == NULL) {
318		pvr2_trace(PVR2_TRACE_ERROR_LEGS, "fe_props not defined!");
319		return -EINVAL;
320	}
321
322	ret = pvr2_channel_limit_inputs(
323	    &adap->channel,
324	    (1 << PVR2_CVAL_INPUT_DTV));
325	if (ret) {
326		pvr2_trace(PVR2_TRACE_ERROR_LEGS,
327			   "failed to grab control of dtv input (code=%d)",
328		    ret);
329		return ret;
330	}
331
332	if (dvb_props->frontend_attach == NULL) {
333		pvr2_trace(PVR2_TRACE_ERROR_LEGS,
334			   "frontend_attach not defined!");
335		ret = -EINVAL;
336		goto done;
337	}
338
339	if (dvb_props->frontend_attach(adap) == 0 && adap->fe[0]) {
340		if (dvb_register_frontend(&adap->dvb_adap, adap->fe[0])) {
341			pvr2_trace(PVR2_TRACE_ERROR_LEGS,
342				   "frontend registration failed!");
343			ret = -ENODEV;
344			goto fail_frontend0;
345		}
346		if (adap->fe[0]->ops.analog_ops.standby)
347			adap->fe[0]->ops.analog_ops.standby(adap->fe[0]);
348
349		pvr2_trace(PVR2_TRACE_INFO, "transferring fe[%d] ts_bus_ctrl() to pvr2_dvb_bus_ctrl()",
350			   adap->fe[0]->id);
351		adap->fe[0]->ops.ts_bus_ctrl = pvr2_dvb_bus_ctrl;
352	} else {
353		pvr2_trace(PVR2_TRACE_ERROR_LEGS,
354			   "no frontend was attached!");
355		ret = -ENODEV;
356		return ret;
357	}
358
359	if (dvb_props->tuner_attach && dvb_props->tuner_attach(adap)) {
360		pvr2_trace(PVR2_TRACE_ERROR_LEGS, "tuner attach failed");
361		ret = -ENODEV;
362		goto fail_tuner;
363	}
364
365	if (adap->fe[1]) {
366		adap->fe[1]->id = 1;
367		adap->fe[1]->tuner_priv = adap->fe[0]->tuner_priv;
368		memcpy(&adap->fe[1]->ops.tuner_ops,
369		       &adap->fe[0]->ops.tuner_ops,
370		       sizeof(struct dvb_tuner_ops));
371
372		if (dvb_register_frontend(&adap->dvb_adap, adap->fe[1])) {
373			pvr2_trace(PVR2_TRACE_ERROR_LEGS,
374				   "frontend registration failed!");
375			ret = -ENODEV;
376			goto fail_frontend1;
377		}
378		/* MFE lock */
379		adap->dvb_adap.mfe_shared = 1;
380
381		if (adap->fe[1]->ops.analog_ops.standby)
382			adap->fe[1]->ops.analog_ops.standby(adap->fe[1]);
383
384		pvr2_trace(PVR2_TRACE_INFO, "transferring fe[%d] ts_bus_ctrl() to pvr2_dvb_bus_ctrl()",
385			   adap->fe[1]->id);
386		adap->fe[1]->ops.ts_bus_ctrl = pvr2_dvb_bus_ctrl;
387	}
388done:
389	pvr2_channel_limit_inputs(&adap->channel, 0);
390	return ret;
391
392fail_frontend1:
393	dvb_frontend_detach(adap->fe[1]);
394	adap->fe[1] = NULL;
395fail_tuner:
396	dvb_unregister_frontend(adap->fe[0]);
397fail_frontend0:
398	dvb_frontend_detach(adap->fe[0]);
399	adap->fe[0] = NULL;
400	dvb_module_release(adap->i2c_client_tuner);
401	dvb_module_release(adap->i2c_client_demod[1]);
402	dvb_module_release(adap->i2c_client_demod[0]);
403
404	return ret;
405}
406
407static int pvr2_dvb_frontend_exit(struct pvr2_dvb_adapter *adap)
408{
409	if (adap->fe[1]) {
410		dvb_unregister_frontend(adap->fe[1]);
411		dvb_frontend_detach(adap->fe[1]);
412		adap->fe[1] = NULL;
413	}
414	if (adap->fe[0]) {
415		dvb_unregister_frontend(adap->fe[0]);
416		dvb_frontend_detach(adap->fe[0]);
417		adap->fe[0] = NULL;
418	}
419
420	dvb_module_release(adap->i2c_client_tuner);
421	adap->i2c_client_tuner = NULL;
422	dvb_module_release(adap->i2c_client_demod[1]);
423	adap->i2c_client_demod[1] = NULL;
424	dvb_module_release(adap->i2c_client_demod[0]);
425	adap->i2c_client_demod[0] = NULL;
426
427	return 0;
428}
429
430static void pvr2_dvb_destroy(struct pvr2_dvb_adapter *adap)
431{
432	pvr2_dvb_stream_end(adap);
433	pvr2_dvb_frontend_exit(adap);
434	pvr2_dvb_adapter_exit(adap);
435	pvr2_channel_done(&adap->channel);
436	kfree(adap);
437}
438
439static void pvr2_dvb_internal_check(struct pvr2_channel *chp)
440{
441	struct pvr2_dvb_adapter *adap;
442	adap = container_of(chp, struct pvr2_dvb_adapter, channel);
443	if (!adap->channel.mc_head->disconnect_flag) return;
444	pvr2_dvb_destroy(adap);
445}
446
447struct pvr2_dvb_adapter *pvr2_dvb_create(struct pvr2_context *pvr)
448{
449	int ret = 0;
450	struct pvr2_dvb_adapter *adap;
451	if (!pvr->hdw->hdw_desc->dvb_props) {
452		/* Device lacks a digital interface so don't set up
453		   the DVB side of the driver either.  For now. */
454		return NULL;
455	}
456	adap = kzalloc(sizeof(*adap), GFP_KERNEL);
457	if (!adap) return adap;
458	pvr2_channel_init(&adap->channel, pvr);
459	adap->channel.check_func = pvr2_dvb_internal_check;
460	init_waitqueue_head(&adap->buffer_wait_data);
461	mutex_init(&adap->lock);
462	ret = pvr2_dvb_adapter_init(adap);
463	if (ret < 0) goto fail1;
464	ret = pvr2_dvb_frontend_init(adap);
465	if (ret < 0) goto fail2;
466	return adap;
467
468fail2:
469	pvr2_dvb_adapter_exit(adap);
470fail1:
471	pvr2_channel_done(&adap->channel);
472	return NULL;
473}
474
475