summaryrefslogtreecommitdiffstats
path: root/drivers/media/dvb-core/dvb_vb2.c
blob: 61c6ca4e87d5fe6ca657bcf10a276ae8b783a40a (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
418
419
420
421
422
423
424
425
426
427
428
429
430
// SPDX-License-Identifier: GPL-2.0
/*
 * dvb-vb2.c - dvb-vb2
 *
 * Copyright (C) 2015 Samsung Electronics
 *
 * Author: jh1009.sung@samsung.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.
 */

#include <linux/err.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/mm.h>

#include <media/dvbdev.h>
#include <media/dvb_vb2.h>

#define DVB_V2_MAX_SIZE		(4096 * 188)

static int vb2_debug;
module_param(vb2_debug, int, 0644);

#define dprintk(level, fmt, arg...)					      \
	do {								      \
		if (vb2_debug >= level)					      \
			pr_info("vb2: %s: " fmt, __func__, ## arg); \
	} while (0)

static int _queue_setup(struct vb2_queue *vq,
			unsigned int *nbuffers, unsigned int *nplanes,
			unsigned int sizes[], struct device *alloc_devs[])
{
	struct dvb_vb2_ctx *ctx = vb2_get_drv_priv(vq);

	ctx->buf_cnt = *nbuffers;
	*nplanes = 1;
	sizes[0] = ctx->buf_siz;

	/*
	 * videobuf2-vmalloc allocator is context-less so no need to set
	 * alloc_ctxs array.
	 */

	dprintk(3, "[%s] count=%d, size=%d\n", ctx->name,
		*nbuffers, sizes[0]);

	return 0;
}

static int _buffer_prepare(struct vb2_buffer *vb)
{
	struct dvb_vb2_ctx *ctx = vb2_get_drv_priv(vb->vb2_queue);
	unsigned long size = ctx->buf_siz;

	if (vb2_plane_size(vb, 0) < size) {
		dprintk(1, "[%s] data will not fit into plane (%lu < %lu)\n",
			ctx->name, vb2_plane_size(vb, 0), size);
		return -EINVAL;
	}

	vb2_set_plane_payload(vb, 0, size);
	dprintk(3, "[%s]\n", ctx->name);

	return 0;
}

static void _buffer_queue(struct vb2_buffer *vb)
{
	struct dvb_vb2_ctx *ctx = vb2_get_drv_priv(vb->vb2_queue);
	struct dvb_buffer *buf = container_of(vb, struct dvb_buffer, vb);
	unsigned long flags = 0;

	spin_lock_irqsave(&ctx->slock, flags);
	list_add_tail(&buf->list, &ctx->dvb_q);
	spin_unlock_irqrestore(&ctx->slock, flags);

	dprintk(3, "[%s]\n", ctx->name);
}

static int _start_streaming(struct vb2_queue *vq, unsigned int count)
{
	struct dvb_vb2_ctx *ctx = vb2_get_drv_priv(vq);

	dprintk(3, "[%s] count=%d\n", ctx->name, count);
	return 0;
}

static void _stop_streaming(struct vb2_queue *vq)
{
	struct dvb_vb2_ctx *ctx = vb2_get_drv_priv(vq);
	struct dvb_buffer *buf;
	unsigned long flags = 0;

	dprintk(3, "[%s]\n", ctx->name);

	spin_lock_irqsave(&ctx->slock, flags);
	while (!list_empty(&ctx->dvb_q)) {
		buf = list_entry(ctx->dvb_q.next,
				 struct dvb_buffer, list);
		vb2_buffer_done(&buf->vb, VB2_BUF_STATE_ERROR);
		list_del(&buf->list);
	}
	spin_unlock_irqrestore(&ctx->slock, flags);
}

static void _dmxdev_lock(struct vb2_queue *vq)
{
	struct dvb_vb2_ctx *ctx = vb2_get_drv_priv(vq);

	mutex_lock(&ctx->mutex);
	dprintk(3, "[%s]\n", ctx->name);
}

static void _dmxdev_unlock(struct vb2_queue *vq)
{
	struct dvb_vb2_ctx *ctx = vb2_get_drv_priv(vq);

	if (mutex_is_locked(&ctx->mutex))
		mutex_unlock(&ctx->mutex);
	dprintk(3, "[%s]\n", ctx->name);
}

static const struct vb2_ops dvb_vb2_qops = {
	.queue_setup		= _queue_setup,
	.buf_prepare		= _buffer_prepare,
	.buf_queue		= _buffer_queue,
	.start_streaming	= _start_streaming,
	.stop_streaming		= _stop_streaming,
	.wait_prepare		= _dmxdev_unlock,
	.wait_finish		= _dmxdev_lock,
};

static void _fill_dmx_buffer(struct vb2_buffer *vb, void *pb)
{
	struct dvb_vb2_ctx *ctx = vb2_get_drv_priv(vb->vb2_queue);
	struct dmx_buffer *b = pb;

	b->index = vb->index;
	b->length = vb->planes[0].length;
	b->bytesused = vb->planes[0].bytesused;
	b->offset = vb->planes[0].m.offset;
	dprintk(3, "[%s]\n", ctx->name);
}

static int _fill_vb2_buffer(struct vb2_buffer *vb,
			    const void *pb, struct vb2_plane *planes)
{
	struct dvb_vb2_ctx *ctx = vb2_get_drv_priv(vb->vb2_queue);

	planes[0].bytesused = 0;
	dprintk(3, "[%s]\n", ctx->name);

	return 0;
}

static const struct vb2_buf_ops dvb_vb2_buf_ops = {
	.fill_user_buffer	= _fill_dmx_buffer,
	.fill_vb2_buffer	= _fill_vb2_buffer,
};

/*
 * Videobuf operations
 */
int dvb_vb2_init(struct dvb_vb2_ctx *ctx, const char *name, int nonblocking)
{
	struct vb2_queue *q = &ctx->vb_q;
	int ret;

	memset(ctx, 0, sizeof(struct dvb_vb2_ctx));
	q->type = DVB_BUF_TYPE_CAPTURE;
	/**capture type*/
	q->is_output = 0;
	/**only mmap is supported currently*/
	q->io_modes = VB2_MMAP;
	q->drv_priv = ctx;
	q->buf_struct_size = sizeof(struct dvb_buffer);
	q->min_buffers_needed = 1;
	q->ops = &dvb_vb2_qops;
	q->mem_ops = &vb2_vmalloc_memops;
	q->buf_ops = &dvb_vb2_buf_ops;
	q->num_buffers = 0;
	ret = vb2_core_queue_init(q);
	if (ret) {
		ctx->state = DVB_VB2_STATE_NONE;
		dprintk(1, "[%s] errno=%d\n", ctx->name, ret);
		return ret;
	}

	mutex_init(&ctx->mutex);
	spin_lock_init(&ctx->slock);
	INIT_LIST_HEAD(&ctx->dvb_q);

	strncpy(ctx->name, name, DVB_VB2_NAME_MAX);
	ctx->nonblocking = nonblocking;
	ctx->state = DVB_VB2_STATE_INIT;

	dprintk(3, "[%s]\n", ctx->name);

	return 0;
}

int dvb_vb2_release(struct dvb_vb2_ctx *ctx)
{
	struct vb2_queue *q = (struct vb2_queue *)&ctx->vb_q;

	if (ctx->state & DVB_VB2_STATE_INIT)
		vb2_core_queue_release(q);

	ctx->state = DVB_VB2_STATE_NONE;
	dprintk(3, "[%s]\n", ctx->name);

	return 0;
}

int dvb_vb2_stream_on(struct dvb_vb2_ctx *ctx)
{
	struct vb2_queue *q = &ctx->vb_q;
	int ret;

	ret = vb2_core_streamon(q, q->type);
	if (ret) {
		ctx->state = DVB_VB2_STATE_NONE;
		dprintk(1, "[%s] errno=%d\n", ctx->name, ret);
		return ret;
	}
	ctx->state |= DVB_VB2_STATE_STREAMON;
	dprintk(3, "[%s]\n", ctx->name);

	return 0;
}

int dvb_vb2_stream_off(struct dvb_vb2_ctx *ctx)
{
	struct vb2_queue *q = (struct vb2_queue *)&ctx->vb_q;
	int ret;

	ctx->state &= ~DVB_VB2_STATE_STREAMON;
	ret = vb2_core_streamoff(q, q->type);
	if (ret) {
		ctx->state = DVB_VB2_STATE_NONE;
		dprintk(1, "[%s] errno=%d\n", ctx->name, ret);
		return ret;
	}
	dprintk(3, "[%s]\n", ctx->name);

	return 0;
}

int dvb_vb2_is_streaming(struct dvb_vb2_ctx *ctx)
{
	return (ctx->state & DVB_VB2_STATE_STREAMON);
}

int dvb_vb2_fill_buffer(struct dvb_vb2_ctx *ctx,
			const unsigned char *src, int len)
{
	unsigned long flags = 0;
	void *vbuf = NULL;
	int todo = len;
	unsigned char *psrc = (unsigned char *)src;
	int ll = 0;

	dprintk(3, "[%s] %d bytes are rcvd\n", ctx->name, len);
	if (!src) {
		dprintk(3, "[%s]:NULL pointer src\n", ctx->name);
		/**normal case: This func is called twice from demux driver
		 * once with valid src pointer, second time with NULL pointer
		 */
		return 0;
	}
	spin_lock_irqsave(&ctx->slock, flags);
	while (todo) {
		if (!ctx->buf) {
			if (list_empty(&ctx->dvb_q)) {
				dprintk(3, "[%s] Buffer overflow!!!\n",
					ctx->name);
				break;
			}

			ctx->buf = list_entry(ctx->dvb_q.next,
					      struct dvb_buffer, list);
			ctx->remain = vb2_plane_size(&ctx->buf->vb, 0);
			ctx->offset = 0;
		}

		if (!dvb_vb2_is_streaming(ctx)) {
			vb2_buffer_done(&ctx->buf->vb, VB2_BUF_STATE_ERROR);
			list_del(&ctx->buf->list);
			ctx->buf = NULL;
			break;
		}

		/* Fill buffer */
		ll = min(todo, ctx->remain);
		vbuf = vb2_plane_vaddr(&ctx->buf->vb, 0);
		memcpy(vbuf + ctx->offset, psrc, ll);
		todo -= ll;
		psrc += ll;

		ctx->remain -= ll;
		ctx->offset += ll;

		if (ctx->remain == 0) {
			vb2_buffer_done(&ctx->buf->vb, VB2_BUF_STATE_DONE);
			list_del(&ctx->buf->list);
			ctx->buf = NULL;
		}
	}

	if (ctx->nonblocking && ctx->buf) {
		vb2_set_plane_payload(&ctx->buf->vb, 0, ll);
		vb2_buffer_done(&ctx->buf->vb, VB2_BUF_STATE_DONE);
		list_del(&ctx->buf->list);
		ctx->buf = NULL;
	}
	spin_unlock_irqrestore(&ctx->slock, flags);

	if (todo)
		dprintk(1, "[%s] %d bytes are dropped.\n", ctx->name, todo);
	else
		dprintk(3, "[%s]\n", ctx->name);

	dprintk(3, "[%s] %d bytes are copied\n", ctx->name, len - todo);
	return (len - todo);
}

int dvb_vb2_reqbufs(struct dvb_vb2_ctx *ctx, struct dmx_requestbuffers *req)
{
	int ret;

	/* Adjust size to a sane value */
	if (req->size > DVB_V2_MAX_SIZE)
		req->size = DVB_V2_MAX_SIZE;

	/* FIXME: round req->size to a 188 or 204 multiple */

	ctx->buf_siz = req->size;
	ctx->buf_cnt = req->count;
	ret = vb2_core_reqbufs(&ctx->vb_q, VB2_MEMORY_MMAP, &req->count);
	if (ret) {
		ctx->state = DVB_VB2_STATE_NONE;
		dprintk(1, "[%s] count=%d size=%d errno=%d\n", ctx->name,
			ctx->buf_cnt, ctx->buf_siz, ret);
		return ret;
	}
	ctx->state |= DVB_VB2_STATE_REQBUFS;
	dprintk(3, "[%s] count=%d size=%d\n", ctx->name,
		ctx->buf_cnt, ctx->buf_siz);

	return 0;
}

int dvb_vb2_querybuf(struct dvb_vb2_ctx *ctx, struct dmx_buffer *b)
{
	vb2_core_querybuf(&ctx->vb_q, b->index, b);
	dprintk(3, "[%s] index=%d\n", ctx->name, b->index);
	return 0;
}

int dvb_vb2_expbuf(struct dvb_vb2_ctx *ctx, struct dmx_exportbuffer *exp)
{
	struct vb2_queue *q = &ctx->vb_q;
	int ret;

	ret = vb2_core_expbuf(&ctx->vb_q, &exp->fd, q->type, exp->index,
			      0, exp->flags);
	if (ret) {
		dprintk(1, "[%s] index=%d errno=%d\n", ctx->name,
			exp->index, ret);
		return ret;
	}
	dprintk(3, "[%s] index=%d fd=%d\n", ctx->name, exp->index, exp->fd);

	return 0;
}

int dvb_vb2_qbuf(struct dvb_vb2_ctx *ctx, struct dmx_buffer *b)
{
	int ret;

	ret = vb2_core_qbuf(&ctx->vb_q, b->index, b);
	if (ret) {
		dprintk(1, "[%s] index=%d errno=%d\n", ctx->name,
			b->index, ret);
		return ret;
	}
	dprintk(5, "[%s] index=%d\n", ctx->name, b->index);

	return 0;
}

int dvb_vb2_dqbuf(struct dvb_vb2_ctx *ctx, struct dmx_buffer *b)
{
	int ret;

	ret = vb2_core_dqbuf(&ctx->vb_q, &b->index, b, ctx->nonblocking);
	if (ret) {
		dprintk(1, "[%s] errno=%d\n", ctx->name, ret);
		return ret;
	}
	dprintk(5, "[%s] index=%d\n", ctx->name, b->index);

	return 0;
}

int dvb_vb2_mmap(struct dvb_vb2_ctx *ctx, struct vm_area_struct *vma)
{
	int ret;

	ret = vb2_mmap(&ctx->vb_q, vma);
	if (ret) {
		dprintk(1, "[%s] errno=%d\n", ctx->name, ret);
		return ret;
	}
	dprintk(3, "[%s] ret=%d\n", ctx->name, ret);

	return 0;
}

unsigned int dvb_vb2_poll(struct dvb_vb2_ctx *ctx, struct file *file,
			  poll_table *wait)
{
	dprintk(3, "[%s]\n", ctx->name);
	return vb2_core_poll(&ctx->vb_q, file, wait);
}