1 // SPDX-License-Identifier: GPL-2.0
2 /*
3 * dvb-vb2.c - dvb-vb2
4 *
5 * Copyright (C) 2015 Samsung Electronics
6 *
7 * Author: jh1009.sung@samsung.com
8 */
9
10 #include <linux/err.h>
11 #include <linux/kernel.h>
12 #include <linux/module.h>
13 #include <linux/mm.h>
14
15 #include <media/dvbdev.h>
16 #include <media/dvb_vb2.h>
17
18 #define DVB_V2_MAX_SIZE (4096 * 188)
19
20 static int vb2_debug;
21 module_param(vb2_debug, int, 0644);
22
23 #define dprintk(level, fmt, arg...) \
24 do { \
25 if (vb2_debug >= level) \
26 pr_info("vb2: %s: " fmt, __func__, ## arg); \
27 } while (0)
28
_queue_setup(struct vb2_queue * vq,unsigned int * nbuffers,unsigned int * nplanes,unsigned int sizes[],struct device * alloc_devs[])29 static int _queue_setup(struct vb2_queue *vq,
30 unsigned int *nbuffers, unsigned int *nplanes,
31 unsigned int sizes[], struct device *alloc_devs[])
32 {
33 struct dvb_vb2_ctx *ctx = vb2_get_drv_priv(vq);
34
35 ctx->buf_cnt = *nbuffers;
36 *nplanes = 1;
37 sizes[0] = ctx->buf_siz;
38
39 /*
40 * videobuf2-vmalloc allocator is context-less so no need to set
41 * alloc_ctxs array.
42 */
43
44 dprintk(3, "[%s] count=%d, size=%d\n", ctx->name,
45 *nbuffers, sizes[0]);
46
47 return 0;
48 }
49
_buffer_prepare(struct vb2_buffer * vb)50 static int _buffer_prepare(struct vb2_buffer *vb)
51 {
52 struct dvb_vb2_ctx *ctx = vb2_get_drv_priv(vb->vb2_queue);
53 unsigned long size = ctx->buf_siz;
54
55 if (vb2_plane_size(vb, 0) < size) {
56 dprintk(1, "[%s] data will not fit into plane (%lu < %lu)\n",
57 ctx->name, vb2_plane_size(vb, 0), size);
58 return -EINVAL;
59 }
60
61 vb2_set_plane_payload(vb, 0, size);
62 dprintk(3, "[%s]\n", ctx->name);
63
64 return 0;
65 }
66
_buffer_queue(struct vb2_buffer * vb)67 static void _buffer_queue(struct vb2_buffer *vb)
68 {
69 struct dvb_vb2_ctx *ctx = vb2_get_drv_priv(vb->vb2_queue);
70 struct dvb_buffer *buf = container_of(vb, struct dvb_buffer, vb);
71 unsigned long flags = 0;
72
73 spin_lock_irqsave(&ctx->slock, flags);
74 list_add_tail(&buf->list, &ctx->dvb_q);
75 spin_unlock_irqrestore(&ctx->slock, flags);
76
77 dprintk(3, "[%s]\n", ctx->name);
78 }
79
_start_streaming(struct vb2_queue * vq,unsigned int count)80 static int _start_streaming(struct vb2_queue *vq, unsigned int count)
81 {
82 struct dvb_vb2_ctx *ctx = vb2_get_drv_priv(vq);
83
84 dprintk(3, "[%s] count=%d\n", ctx->name, count);
85 return 0;
86 }
87
_stop_streaming(struct vb2_queue * vq)88 static void _stop_streaming(struct vb2_queue *vq)
89 {
90 struct dvb_vb2_ctx *ctx = vb2_get_drv_priv(vq);
91 struct dvb_buffer *buf;
92 unsigned long flags = 0;
93
94 dprintk(3, "[%s]\n", ctx->name);
95
96 spin_lock_irqsave(&ctx->slock, flags);
97 while (!list_empty(&ctx->dvb_q)) {
98 buf = list_entry(ctx->dvb_q.next,
99 struct dvb_buffer, list);
100 vb2_buffer_done(&buf->vb, VB2_BUF_STATE_ERROR);
101 list_del(&buf->list);
102 }
103 spin_unlock_irqrestore(&ctx->slock, flags);
104 }
105
_dmxdev_lock(struct vb2_queue * vq)106 static void _dmxdev_lock(struct vb2_queue *vq)
107 {
108 struct dvb_vb2_ctx *ctx = vb2_get_drv_priv(vq);
109
110 mutex_lock(&ctx->mutex);
111 dprintk(3, "[%s]\n", ctx->name);
112 }
113
_dmxdev_unlock(struct vb2_queue * vq)114 static void _dmxdev_unlock(struct vb2_queue *vq)
115 {
116 struct dvb_vb2_ctx *ctx = vb2_get_drv_priv(vq);
117
118 if (mutex_is_locked(&ctx->mutex))
119 mutex_unlock(&ctx->mutex);
120 dprintk(3, "[%s]\n", ctx->name);
121 }
122
123 static const struct vb2_ops dvb_vb2_qops = {
124 .queue_setup = _queue_setup,
125 .buf_prepare = _buffer_prepare,
126 .buf_queue = _buffer_queue,
127 .start_streaming = _start_streaming,
128 .stop_streaming = _stop_streaming,
129 .wait_prepare = _dmxdev_unlock,
130 .wait_finish = _dmxdev_lock,
131 };
132
_fill_dmx_buffer(struct vb2_buffer * vb,void * pb)133 static void _fill_dmx_buffer(struct vb2_buffer *vb, void *pb)
134 {
135 struct dvb_vb2_ctx *ctx = vb2_get_drv_priv(vb->vb2_queue);
136 struct dmx_buffer *b = pb;
137
138 b->index = vb->index;
139 b->length = vb->planes[0].length;
140 b->bytesused = vb->planes[0].bytesused;
141 b->offset = vb->planes[0].m.offset;
142 dprintk(3, "[%s]\n", ctx->name);
143 }
144
_fill_vb2_buffer(struct vb2_buffer * vb,struct vb2_plane * planes)145 static int _fill_vb2_buffer(struct vb2_buffer *vb, struct vb2_plane *planes)
146 {
147 struct dvb_vb2_ctx *ctx = vb2_get_drv_priv(vb->vb2_queue);
148
149 planes[0].bytesused = 0;
150 dprintk(3, "[%s]\n", ctx->name);
151
152 return 0;
153 }
154
155 static const struct vb2_buf_ops dvb_vb2_buf_ops = {
156 .fill_user_buffer = _fill_dmx_buffer,
157 .fill_vb2_buffer = _fill_vb2_buffer,
158 };
159
160 /*
161 * Videobuf operations
162 */
dvb_vb2_init(struct dvb_vb2_ctx * ctx,const char * name,int nonblocking)163 int dvb_vb2_init(struct dvb_vb2_ctx *ctx, const char *name, int nonblocking)
164 {
165 struct vb2_queue *q = &ctx->vb_q;
166 int ret;
167
168 memset(ctx, 0, sizeof(struct dvb_vb2_ctx));
169 q->type = DVB_BUF_TYPE_CAPTURE;
170 /**capture type*/
171 q->is_output = 0;
172 /**only mmap is supported currently*/
173 q->io_modes = VB2_MMAP;
174 q->drv_priv = ctx;
175 q->buf_struct_size = sizeof(struct dvb_buffer);
176 q->min_buffers_needed = 1;
177 q->ops = &dvb_vb2_qops;
178 q->mem_ops = &vb2_vmalloc_memops;
179 q->buf_ops = &dvb_vb2_buf_ops;
180 q->num_buffers = 0;
181 ret = vb2_core_queue_init(q);
182 if (ret) {
183 ctx->state = DVB_VB2_STATE_NONE;
184 dprintk(1, "[%s] errno=%d\n", ctx->name, ret);
185 return ret;
186 }
187
188 mutex_init(&ctx->mutex);
189 spin_lock_init(&ctx->slock);
190 INIT_LIST_HEAD(&ctx->dvb_q);
191
192 strscpy(ctx->name, name, DVB_VB2_NAME_MAX);
193 ctx->nonblocking = nonblocking;
194 ctx->state = DVB_VB2_STATE_INIT;
195
196 dprintk(3, "[%s]\n", ctx->name);
197
198 return 0;
199 }
200
dvb_vb2_release(struct dvb_vb2_ctx * ctx)201 int dvb_vb2_release(struct dvb_vb2_ctx *ctx)
202 {
203 struct vb2_queue *q = (struct vb2_queue *)&ctx->vb_q;
204
205 if (ctx->state & DVB_VB2_STATE_INIT)
206 vb2_core_queue_release(q);
207
208 ctx->state = DVB_VB2_STATE_NONE;
209 dprintk(3, "[%s]\n", ctx->name);
210
211 return 0;
212 }
213
dvb_vb2_stream_on(struct dvb_vb2_ctx * ctx)214 int dvb_vb2_stream_on(struct dvb_vb2_ctx *ctx)
215 {
216 struct vb2_queue *q = &ctx->vb_q;
217 int ret;
218
219 ret = vb2_core_streamon(q, q->type);
220 if (ret) {
221 ctx->state = DVB_VB2_STATE_NONE;
222 dprintk(1, "[%s] errno=%d\n", ctx->name, ret);
223 return ret;
224 }
225 ctx->state |= DVB_VB2_STATE_STREAMON;
226 dprintk(3, "[%s]\n", ctx->name);
227
228 return 0;
229 }
230
dvb_vb2_stream_off(struct dvb_vb2_ctx * ctx)231 int dvb_vb2_stream_off(struct dvb_vb2_ctx *ctx)
232 {
233 struct vb2_queue *q = (struct vb2_queue *)&ctx->vb_q;
234 int ret;
235
236 ctx->state &= ~DVB_VB2_STATE_STREAMON;
237 ret = vb2_core_streamoff(q, q->type);
238 if (ret) {
239 ctx->state = DVB_VB2_STATE_NONE;
240 dprintk(1, "[%s] errno=%d\n", ctx->name, ret);
241 return ret;
242 }
243 dprintk(3, "[%s]\n", ctx->name);
244
245 return 0;
246 }
247
dvb_vb2_is_streaming(struct dvb_vb2_ctx * ctx)248 int dvb_vb2_is_streaming(struct dvb_vb2_ctx *ctx)
249 {
250 return (ctx->state & DVB_VB2_STATE_STREAMON);
251 }
252
dvb_vb2_fill_buffer(struct dvb_vb2_ctx * ctx,const unsigned char * src,int len,enum dmx_buffer_flags * buffer_flags)253 int dvb_vb2_fill_buffer(struct dvb_vb2_ctx *ctx,
254 const unsigned char *src, int len,
255 enum dmx_buffer_flags *buffer_flags)
256 {
257 unsigned long flags = 0;
258 void *vbuf = NULL;
259 int todo = len;
260 unsigned char *psrc = (unsigned char *)src;
261 int ll = 0;
262
263 /*
264 * normal case: This func is called twice from demux driver
265 * one with valid src pointer, second time with NULL pointer
266 */
267 if (!src || !len)
268 return 0;
269 spin_lock_irqsave(&ctx->slock, flags);
270 if (buffer_flags && *buffer_flags) {
271 ctx->flags |= *buffer_flags;
272 *buffer_flags = 0;
273 }
274 while (todo) {
275 if (!ctx->buf) {
276 if (list_empty(&ctx->dvb_q)) {
277 dprintk(3, "[%s] Buffer overflow!!!\n",
278 ctx->name);
279 break;
280 }
281
282 ctx->buf = list_entry(ctx->dvb_q.next,
283 struct dvb_buffer, list);
284 ctx->remain = vb2_plane_size(&ctx->buf->vb, 0);
285 ctx->offset = 0;
286 }
287
288 if (!dvb_vb2_is_streaming(ctx)) {
289 vb2_buffer_done(&ctx->buf->vb, VB2_BUF_STATE_ERROR);
290 list_del(&ctx->buf->list);
291 ctx->buf = NULL;
292 break;
293 }
294
295 /* Fill buffer */
296 ll = min(todo, ctx->remain);
297 vbuf = vb2_plane_vaddr(&ctx->buf->vb, 0);
298 memcpy(vbuf + ctx->offset, psrc, ll);
299 todo -= ll;
300 psrc += ll;
301
302 ctx->remain -= ll;
303 ctx->offset += ll;
304
305 if (ctx->remain == 0) {
306 vb2_buffer_done(&ctx->buf->vb, VB2_BUF_STATE_DONE);
307 list_del(&ctx->buf->list);
308 ctx->buf = NULL;
309 }
310 }
311
312 if (ctx->nonblocking && ctx->buf) {
313 vb2_set_plane_payload(&ctx->buf->vb, 0, ll);
314 vb2_buffer_done(&ctx->buf->vb, VB2_BUF_STATE_DONE);
315 list_del(&ctx->buf->list);
316 ctx->buf = NULL;
317 }
318 spin_unlock_irqrestore(&ctx->slock, flags);
319
320 if (todo)
321 dprintk(1, "[%s] %d bytes are dropped.\n", ctx->name, todo);
322 else
323 dprintk(3, "[%s]\n", ctx->name);
324
325 dprintk(3, "[%s] %d bytes are copied\n", ctx->name, len - todo);
326 return (len - todo);
327 }
328
dvb_vb2_reqbufs(struct dvb_vb2_ctx * ctx,struct dmx_requestbuffers * req)329 int dvb_vb2_reqbufs(struct dvb_vb2_ctx *ctx, struct dmx_requestbuffers *req)
330 {
331 int ret;
332
333 /* Adjust size to a sane value */
334 if (req->size > DVB_V2_MAX_SIZE)
335 req->size = DVB_V2_MAX_SIZE;
336
337 /* FIXME: round req->size to a 188 or 204 multiple */
338
339 ctx->buf_siz = req->size;
340 ctx->buf_cnt = req->count;
341 ret = vb2_core_reqbufs(&ctx->vb_q, VB2_MEMORY_MMAP, 0, &req->count);
342 if (ret) {
343 ctx->state = DVB_VB2_STATE_NONE;
344 dprintk(1, "[%s] count=%d size=%d errno=%d\n", ctx->name,
345 ctx->buf_cnt, ctx->buf_siz, ret);
346 return ret;
347 }
348 ctx->state |= DVB_VB2_STATE_REQBUFS;
349 dprintk(3, "[%s] count=%d size=%d\n", ctx->name,
350 ctx->buf_cnt, ctx->buf_siz);
351
352 return 0;
353 }
354
dvb_vb2_querybuf(struct dvb_vb2_ctx * ctx,struct dmx_buffer * b)355 int dvb_vb2_querybuf(struct dvb_vb2_ctx *ctx, struct dmx_buffer *b)
356 {
357 struct vb2_queue *q = &ctx->vb_q;
358
359 if (b->index >= q->num_buffers) {
360 dprintk(1, "[%s] buffer index out of range\n", ctx->name);
361 return -EINVAL;
362 }
363 vb2_core_querybuf(&ctx->vb_q, b->index, b);
364 dprintk(3, "[%s] index=%d\n", ctx->name, b->index);
365 return 0;
366 }
367
dvb_vb2_expbuf(struct dvb_vb2_ctx * ctx,struct dmx_exportbuffer * exp)368 int dvb_vb2_expbuf(struct dvb_vb2_ctx *ctx, struct dmx_exportbuffer *exp)
369 {
370 struct vb2_queue *q = &ctx->vb_q;
371 int ret;
372
373 ret = vb2_core_expbuf(&ctx->vb_q, &exp->fd, q->type, exp->index,
374 0, exp->flags);
375 if (ret) {
376 dprintk(1, "[%s] index=%d errno=%d\n", ctx->name,
377 exp->index, ret);
378 return ret;
379 }
380 dprintk(3, "[%s] index=%d fd=%d\n", ctx->name, exp->index, exp->fd);
381
382 return 0;
383 }
384
dvb_vb2_qbuf(struct dvb_vb2_ctx * ctx,struct dmx_buffer * b)385 int dvb_vb2_qbuf(struct dvb_vb2_ctx *ctx, struct dmx_buffer *b)
386 {
387 struct vb2_queue *q = &ctx->vb_q;
388 int ret;
389
390 if (b->index >= q->num_buffers) {
391 dprintk(1, "[%s] buffer index out of range\n", ctx->name);
392 return -EINVAL;
393 }
394 ret = vb2_core_qbuf(&ctx->vb_q, b->index, b, NULL);
395 if (ret) {
396 dprintk(1, "[%s] index=%d errno=%d\n", ctx->name,
397 b->index, ret);
398 return ret;
399 }
400 dprintk(5, "[%s] index=%d\n", ctx->name, b->index);
401
402 return 0;
403 }
404
dvb_vb2_dqbuf(struct dvb_vb2_ctx * ctx,struct dmx_buffer * b)405 int dvb_vb2_dqbuf(struct dvb_vb2_ctx *ctx, struct dmx_buffer *b)
406 {
407 unsigned long flags;
408 int ret;
409
410 ret = vb2_core_dqbuf(&ctx->vb_q, &b->index, b, ctx->nonblocking);
411 if (ret) {
412 dprintk(1, "[%s] errno=%d\n", ctx->name, ret);
413 return ret;
414 }
415
416 spin_lock_irqsave(&ctx->slock, flags);
417 b->count = ctx->count++;
418 b->flags = ctx->flags;
419 ctx->flags = 0;
420 spin_unlock_irqrestore(&ctx->slock, flags);
421
422 dprintk(5, "[%s] index=%d, count=%d, flags=%d\n",
423 ctx->name, b->index, ctx->count, b->flags);
424
425
426 return 0;
427 }
428
dvb_vb2_mmap(struct dvb_vb2_ctx * ctx,struct vm_area_struct * vma)429 int dvb_vb2_mmap(struct dvb_vb2_ctx *ctx, struct vm_area_struct *vma)
430 {
431 int ret;
432
433 ret = vb2_mmap(&ctx->vb_q, vma);
434 if (ret) {
435 dprintk(1, "[%s] errno=%d\n", ctx->name, ret);
436 return ret;
437 }
438 dprintk(3, "[%s] ret=%d\n", ctx->name, ret);
439
440 return 0;
441 }
442
dvb_vb2_poll(struct dvb_vb2_ctx * ctx,struct file * file,poll_table * wait)443 __poll_t dvb_vb2_poll(struct dvb_vb2_ctx *ctx, struct file *file,
444 poll_table *wait)
445 {
446 dprintk(3, "[%s]\n", ctx->name);
447 return vb2_core_poll(&ctx->vb_q, file, wait);
448 }
449
450