summaryrefslogtreecommitdiffstats
path: root/drivers/media/usb/pvrusb2/pvrusb2-context.c
blob: d9e8481e9e286e5f2d6dc7584155e995d7541cc2 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
/*
 *
 *  Copyright (C) 2005 Mike Isely <isely@pobox.com>
 *
 *  This program is free software; you can redistribute it and/or modify
 *  it under the terms of the GNU General Public License as published by
 *  the Free Software Foundation; either version 2 of the License
 *
 *  This program is distributed in the hope that it will be useful,
 *  but WITHOUT ANY WARRANTY; without even the implied warranty of
 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *  GNU General Public License for more details.
 *
 */

#include "pvrusb2-context.h"
#include "pvrusb2-io.h"
#include "pvrusb2-ioread.h"
#include "pvrusb2-hdw.h"
#include "pvrusb2-debug.h"
#include <linux/wait.h>
#include <linux/kthread.h>
#include <linux/errno.h>
#include <linux/string.h>
#include <linux/slab.h>

static struct pvr2_context *pvr2_context_exist_first;
static struct pvr2_context *pvr2_context_exist_last;
static struct pvr2_context *pvr2_context_notify_first;
static struct pvr2_context *pvr2_context_notify_last;
static DEFINE_MUTEX(pvr2_context_mutex);
static DECLARE_WAIT_QUEUE_HEAD(pvr2_context_sync_data);
static DECLARE_WAIT_QUEUE_HEAD(pvr2_context_cleanup_data);
static int pvr2_context_cleanup_flag;
static int pvr2_context_cleaned_flag;
static struct task_struct *pvr2_context_thread_ptr;


static void pvr2_context_set_notify(struct pvr2_context *mp, int fl)
{
	int signal_flag = 0;
	mutex_lock(&pvr2_context_mutex);
	if (fl) {
		if (!mp->notify_flag) {
			signal_flag = (pvr2_context_notify_first == NULL);
			mp->notify_prev = pvr2_context_notify_last;
			mp->notify_next = NULL;
			pvr2_context_notify_last = mp;
			if (mp->notify_prev) {
				mp->notify_prev->notify_next = mp;
			} else {
				pvr2_context_notify_first = mp;
			}
			mp->notify_flag = !0;
		}
	} else {
		if (mp->notify_flag) {
			mp->notify_flag = 0;
			if (mp->notify_next) {
				mp->notify_next->notify_prev = mp->notify_prev;
			} else {
				pvr2_context_notify_last = mp->notify_prev;
			}
			if (mp->notify_prev) {
				mp->notify_prev->notify_next = mp->notify_next;
			} else {
				pvr2_context_notify_first = mp->notify_next;
			}
		}
	}
	mutex_unlock(&pvr2_context_mutex);
	if (signal_flag) wake_up(&pvr2_context_sync_data);
}


static void pvr2_context_destroy(struct pvr2_context *mp)
{
	pvr2_trace(PVR2_TRACE_CTXT,"pvr2_context %p (destroy)",mp);
	pvr2_hdw_destroy(mp->hdw);
	pvr2_context_set_notify(mp, 0);
	mutex_lock(&pvr2_context_mutex);
	if (mp->exist_next) {
		mp->exist_next->exist_prev = mp->exist_prev;
	} else {
		pvr2_context_exist_last = mp->exist_prev;
	}
	if (mp->exist_prev) {
		mp->exist_prev->exist_next = mp->exist_next;
	} else {
		pvr2_context_exist_first = mp->exist_next;
	}
	if (!pvr2_context_exist_first) {
		/* Trigger wakeup on control thread in case it is waiting
		   for an exit condition. */
		wake_up(&pvr2_context_sync_data);
	}
	mutex_unlock(&pvr2_context_mutex);
	kfree(mp);
}


static void pvr2_context_notify(struct pvr2_context *mp)
{
	pvr2_context_set_notify(mp,!0);
}


static void pvr2_context_check(struct pvr2_context *mp)
{
	struct pvr2_channel *ch1, *ch2;
	pvr2_trace(PVR2_TRACE_CTXT,
		   "pvr2_context %p (notify)", mp);
	if (!mp->initialized_flag && !mp->disconnect_flag) {
		mp->initialized_flag = !0;
		pvr2_trace(PVR2_TRACE_CTXT,
			   "pvr2_context %p (initialize)", mp);
		/* Finish hardware initialization */
		if (pvr2_hdw_initialize(mp->hdw,
					(void (*)(void *))pvr2_context_notify,
					mp)) {
			mp->video_stream.stream =
				pvr2_hdw_get_video_stream(mp->hdw);
			/* Trigger interface initialization.  By doing this
			   here initialization runs in our own safe and
			   cozy thread context. */
			if (mp->setup_func) mp->setup_func(mp);
		} else {
			pvr2_trace(PVR2_TRACE_CTXT,
				   "pvr2_context %p (thread skipping setup)",
				   mp);
			/* Even though initialization did not succeed,
			   we're still going to continue anyway.  We need
			   to do this in order to await the expected
			   disconnect (which we will detect in the normal
			   course of operation). */
		}
	}

	for (ch1 = mp->mc_first; ch1; ch1 = ch2) {
		ch2 = ch1->mc_next;
		if (ch1->check_func) ch1->check_func(ch1);
	}

	if (mp->disconnect_flag && !mp->mc_first) {
		/* Go away... */
		pvr2_context_destroy(mp);
		return;
	}
}


static int pvr2_context_shutok(void)
{
	return pvr2_context_cleanup_flag && (pvr2_context_exist_first == NULL);
}


static int pvr2_context_thread_func(void *foo)
{
	struct pvr2_context *mp;

	pvr2_trace(PVR2_TRACE_CTXT,"pvr2_context thread start");

	do {
		while ((mp = pvr2_context_notify_first) != NULL) {
			pvr2_context_set_notify(mp, 0);
			pvr2_context_check(mp);
		}
		wait_event_interruptible(
			pvr2_context_sync_data,
			((pvr2_context_notify_first != NULL) ||
			 pvr2_context_shutok()));
	} while (!pvr2_context_shutok());

	pvr2_context_cleaned_flag = !0;
	wake_up(&pvr2_context_cleanup_data);

	pvr2_trace(PVR2_TRACE_CTXT,"pvr2_context thread cleaned up");

	wait_event_interruptible(
		pvr2_context_sync_data,
		kthread_should_stop());

	pvr2_trace(PVR2_TRACE_CTXT,"pvr2_context thread end");

	return 0;
}


int pvr2_context_global_init(void)
{
	pvr2_context_thread_ptr = kthread_run(pvr2_context_thread_func,
					      NULL,
					      "pvrusb2-context");
	return IS_ERR(pvr2_context_thread_ptr) ? -ENOMEM : 0;
}


void pvr2_context_global_done(void)
{
	pvr2_context_cleanup_flag = !0;
	wake_up(&pvr2_context_sync_data);
	wait_event_interruptible(
		pvr2_context_cleanup_data,
		pvr2_context_cleaned_flag);
	kthread_stop(pvr2_context_thread_ptr);
}


struct pvr2_context *pvr2_context_create(
	struct usb_interface *intf,
	const struct usb_device_id *devid,
	void (*setup_func)(struct pvr2_context *))
{
	struct pvr2_context *mp = NULL;
	mp = kzalloc(sizeof(*mp),GFP_KERNEL);
	if (!mp) goto done;
	pvr2_trace(PVR2_TRACE_CTXT,"pvr2_context %p (create)",mp);
	mp->setup_func = setup_func;
	mutex_init(&mp->mutex);
	mutex_lock(&pvr2_context_mutex);
	mp->exist_prev = pvr2_context_exist_last;
	mp->exist_next = NULL;
	pvr2_context_exist_last = mp;
	if (mp->exist_prev) {
		mp->exist_prev->exist_next = mp;
	} else {
		pvr2_context_exist_first = mp;
	}
	mutex_unlock(&pvr2_context_mutex);
	mp->hdw = pvr2_hdw_create(intf,devid);
	if (!mp->hdw) {
		pvr2_context_destroy(mp);
		mp = NULL;
		goto done;
	}
	pvr2_context_set_notify(mp, !0);
 done:
	return mp;
}


static void pvr2_context_reset_input_limits(struct pvr2_context *mp)
{
	unsigned int tmsk,mmsk;
	struct pvr2_channel *cp;
	struct pvr2_hdw *hdw = mp->hdw;
	mmsk = pvr2_hdw_get_input_available(hdw);
	tmsk = mmsk;
	for (cp = mp->mc_first; cp; cp = cp->mc_next) {
		if (!cp->input_mask) continue;
		tmsk &= cp->input_mask;
	}
	pvr2_hdw_set_input_allowed(hdw,mmsk,tmsk);
	pvr2_hdw_commit_ctl(hdw);
}


static void pvr2_context_enter(struct pvr2_context *mp)
{
	mutex_lock(&mp->mutex);
}


static void pvr2_context_exit(struct pvr2_context *mp)
{
	int destroy_flag = 0;
	if (!(mp->mc_first || !mp->disconnect_flag)) {
		destroy_flag = !0;
	}
	mutex_unlock(&mp->mutex);
	if (destroy_flag) pvr2_context_notify(mp);
}


void pvr2_context_disconnect(struct pvr2_context *mp)
{
	pvr2_hdw_disconnect(mp->hdw);
	mp->disconnect_flag = !0;
	pvr2_context_notify(mp);
}


void pvr2_channel_init(struct pvr2_channel *cp,struct pvr2_context *mp)
{
	pvr2_context_enter(mp);
	cp->hdw = mp->hdw;
	cp->mc_head = mp;
	cp->mc_next = NULL;
	cp->mc_prev = mp->mc_last;
	if (mp->mc_last) {
		mp->mc_last->mc_next = cp;
	} else {
		mp->mc_first = cp;
	}
	mp->mc_last = cp;
	pvr2_context_exit(mp);
}


static void pvr2_channel_disclaim_stream(struct pvr2_channel *cp)
{
	if (!cp->stream) return;
	pvr2_stream_kill(cp->stream->stream);
	cp->stream->user = NULL;
	cp->stream = NULL;
}


void pvr2_channel_done(struct pvr2_channel *cp)
{
	struct pvr2_context *mp = cp->mc_head;
	pvr2_context_enter(mp);
	cp->input_mask = 0;
	pvr2_channel_disclaim_stream(cp);
	pvr2_context_reset_input_limits(mp);
	if (cp->mc_next) {
		cp->mc_next->mc_prev = cp->mc_prev;
	} else {
		mp->mc_last = cp->mc_prev;
	}
	if (cp->mc_prev) {
		cp->mc_prev->mc_next = cp->mc_next;
	} else {
		mp->mc_first = cp->mc_next;
	}
	cp->hdw = NULL;
	pvr2_context_exit(mp);
}


int pvr2_channel_limit_inputs(struct pvr2_channel *cp,unsigned int cmsk)
{
	unsigned int tmsk,mmsk;
	int ret = 0;
	struct pvr2_channel *p2;
	struct pvr2_hdw *hdw = cp->hdw;

	mmsk = pvr2_hdw_get_input_available(hdw);
	cmsk &= mmsk;
	if (cmsk == cp->input_mask) {
		/* No change; nothing to do */
		return 0;
	}

	pvr2_context_enter(cp->mc_head);
	do {
		if (!cmsk) {
			cp->input_mask = 0;
			pvr2_context_reset_input_limits(cp->mc_head);
			break;
		}
		tmsk = mmsk;
		for (p2 = cp->mc_head->mc_first; p2; p2 = p2->mc_next) {
			if (p2 == cp) continue;
			if (!p2->input_mask) continue;
			tmsk &= p2->input_mask;
		}
		if (!(tmsk & cmsk)) {
			ret = -EPERM;
			break;
		}
		tmsk &= cmsk;
		if ((ret = pvr2_hdw_set_input_allowed(hdw,mmsk,tmsk)) != 0) {
			/* Internal failure changing allowed list; probably
			   should not happen, but react if it does. */
			break;
		}
		cp->input_mask = cmsk;
		pvr2_hdw_commit_ctl(hdw);
	} while (0);
	pvr2_context_exit(cp->mc_head);
	return ret;
}


unsigned int pvr2_channel_get_limited_inputs(struct pvr2_channel *cp)
{
	return cp->input_mask;
}


int pvr2_channel_claim_stream(struct pvr2_channel *cp,
			      struct pvr2_context_stream *sp)
{
	int code = 0;
	pvr2_context_enter(cp->mc_head); do {
		if (sp == cp->stream) break;
		if (sp && sp->user) {
			code = -EBUSY;
			break;
		}
		pvr2_channel_disclaim_stream(cp);
		if (!sp) break;
		sp->user = cp;
		cp->stream = sp;
	} while (0);
	pvr2_context_exit(cp->mc_head);
	return code;
}


// This is the marker for the real beginning of a legitimate mpeg2 stream.
static char stream_sync_key[] = {
	0x00, 0x00, 0x01, 0xba,
};

struct pvr2_ioread *pvr2_channel_create_mpeg_stream(
	struct pvr2_context_stream *sp)
{
	struct pvr2_ioread *cp;
	cp = pvr2_ioread_create();
	if (!cp) return NULL;
	pvr2_ioread_setup(cp,sp->stream);
	pvr2_ioread_set_sync_key(cp,stream_sync_key,sizeof(stream_sync_key));
	return cp;
}