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