1 /* 2 * SPDX-License-Identifier: GPL-2.0 3 * 4 * dvb-vb2.h - DVB driver helper framework for streaming I/O 5 * 6 * Copyright (C) 2015 Samsung Electronics 7 * 8 * Author: jh1009.sung@samsung.com 9 * 10 * This program is free software; you can redistribute it and/or modify 11 * it under the terms of the GNU General Public License as published by 12 * the Free Software Foundation. 13 */ 14 15 #ifndef _DVB_VB2_H 16 #define _DVB_VB2_H 17 18 #include <linux/mutex.h> 19 #include <linux/poll.h> 20 #include <linux/dvb/dmx.h> 21 #include <media/videobuf2-core.h> 22 #include <media/videobuf2-dma-contig.h> 23 #include <media/videobuf2-vmalloc.h> 24 25 enum dvb_buf_type { 26 DVB_BUF_TYPE_CAPTURE = 1, 27 DVB_BUF_TYPE_OUTPUT = 2, 28 }; 29 30 #define DVB_VB2_STATE_NONE (0x0) 31 #define DVB_VB2_STATE_INIT (0x1) 32 #define DVB_VB2_STATE_REQBUFS (0x2) 33 #define DVB_VB2_STATE_STREAMON (0x4) 34 35 #define DVB_VB2_NAME_MAX (20) 36 37 struct dvb_buffer { 38 struct vb2_buffer vb; 39 struct list_head list; 40 }; 41 42 struct dvb_vb2_ctx { 43 struct vb2_queue vb_q; 44 struct mutex mutex; 45 spinlock_t slock; 46 struct list_head dvb_q; 47 struct dvb_buffer *buf; 48 int offset; 49 int remain; 50 int state; 51 int buf_siz; 52 int buf_cnt; 53 int nonblocking; 54 char name[DVB_VB2_NAME_MAX + 1]; 55 }; 56 57 int dvb_vb2_stream_on(struct dvb_vb2_ctx *ctx); 58 int dvb_vb2_stream_off(struct dvb_vb2_ctx *ctx); 59 #ifndef DVB_MMAP 60 static inline int dvb_vb2_init(struct dvb_vb2_ctx *ctx, 61 const char *name, int non_blocking) 62 { 63 return 0; 64 }; 65 static inline int dvb_vb2_release(struct dvb_vb2_ctx *ctx) 66 { 67 return 0; 68 }; 69 #define dvb_vb2_is_streaming(ctx) (0) 70 #define dvb_vb2_fill_buffer(ctx, file, wait) (0) 71 72 static inline unsigned int dvb_vb2_poll(struct dvb_vb2_ctx *ctx, 73 struct file *file, 74 poll_table *wait) 75 { 76 return 0; 77 } 78 #else 79 int dvb_vb2_init(struct dvb_vb2_ctx *ctx, const char *name, int non_blocking); 80 int dvb_vb2_release(struct dvb_vb2_ctx *ctx); 81 int dvb_vb2_is_streaming(struct dvb_vb2_ctx *ctx); 82 int dvb_vb2_fill_buffer(struct dvb_vb2_ctx *ctx, 83 const unsigned char *src, int len); 84 unsigned int dvb_vb2_poll(struct dvb_vb2_ctx *ctx, struct file *file, 85 poll_table *wait); 86 #endif 87 88 89 int dvb_vb2_reqbufs(struct dvb_vb2_ctx *ctx, struct dmx_requestbuffers *req); 90 int dvb_vb2_querybuf(struct dvb_vb2_ctx *ctx, struct dmx_buffer *b); 91 int dvb_vb2_expbuf(struct dvb_vb2_ctx *ctx, struct dmx_exportbuffer *exp); 92 int dvb_vb2_qbuf(struct dvb_vb2_ctx *ctx, struct dmx_buffer *b); 93 int dvb_vb2_dqbuf(struct dvb_vb2_ctx *ctx, struct dmx_buffer *b); 94 int dvb_vb2_mmap(struct dvb_vb2_ctx *ctx, struct vm_area_struct *vma); 95 96 #endif /* _DVB_VB2_H */ 97