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Linux kernel mirror (for testing) git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
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123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354555657585960616263646566676869707172737475767778798081828384858687888990919293949596979899100101102103104105106107108109110111112113114115116117118119120121122123124125126127128129130131132133134135136137138139140141142143144145146147148149150151152153154155156157158159160161162163164165166167168169170171172173174175176177178179180181182183184185186187188189190191192193194195196197198199200201202203204205206207208209210211212213214215216217218219220221222223224225226227228229230231232233234235236237238239240241242243244245246247248249250251252253254255256257258259260261262263264265266267268269270271272273274275276277278279280281282/* * SPDX-License-Identifier: GPL-2.0 * * dvb-vb2.h - DVB driver helper framework for streaming I/O * * 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. */
#ifndef _DVB_VB2_H#define _DVB_VB2_H
#include <linux/mutex.h>#include <linux/poll.h>#include <linux/dvb/dmx.h>#include <media/videobuf2-core.h>#include <media/videobuf2-dma-contig.h>#include <media/videobuf2-vmalloc.h>
/** * enum dvb_buf_type - types of Digital TV memory-mapped buffers * * @DVB_BUF_TYPE_CAPTURE: buffer is filled by the Kernel, * with a received Digital TV stream */enum dvb_buf_type { DVB_BUF_TYPE_CAPTURE = 1,};
/** * enum dvb_vb2_states - states to control VB2 state machine * @DVB_VB2_STATE_NONE: * VB2 engine not initialized yet, init failed or VB2 was released. * @DVB_VB2_STATE_INIT: * VB2 engine initialized. * @DVB_VB2_STATE_REQBUFS: * Buffers were requested * @DVB_VB2_STATE_STREAMON: * VB2 is streaming. Callers should not check it directly. Instead, * they should use dvb_vb2_is_streaming(). * * Note: * * Callers should not touch at the state machine directly. This * is handled inside dvb_vb2.c. */enum dvb_vb2_states { DVB_VB2_STATE_NONE = 0x0, DVB_VB2_STATE_INIT = 0x1, DVB_VB2_STATE_REQBUFS = 0x2, DVB_VB2_STATE_STREAMON = 0x4,};
#define DVB_VB2_NAME_MAX (20)
/** * struct dvb_buffer - video buffer information for v4l2. * * @vb: embedded struct &vb2_buffer. * @list: list of &struct dvb_buffer. */struct dvb_buffer { struct vb2_buffer vb; struct list_head list;};
/** * struct dvb_vb2_ctx - control struct for VB2 handler * @vb_q: pointer to &struct vb2_queue with videobuf2 queue. * @slock: spin lock used to protect buffer filling at dvb_vb2.c. * @dvb_q: List of buffers that are not filled yet. * @buf: Pointer to the buffer that are currently being filled. * @offset: index to the next position at the @buf to be filled. * @remain: How many bytes are left to be filled at @buf. * @state: bitmask of buffer states as defined by &enum dvb_vb2_states. * @buf_siz: size of each VB2 buffer. * @buf_cnt: number of VB2 buffers. * @nonblocking: * If different than zero, device is operating on non-blocking * mode. * @flags: buffer flags as defined by &enum dmx_buffer_flags. * Filled only at &DMX_DQBUF. &DMX_QBUF should zero this field. * @count: monotonic counter for filled buffers. Helps to identify * data stream loses. Filled only at &DMX_DQBUF. &DMX_QBUF should * zero this field. * * @name: name of the device type. Currently, it can either be * "dvr" or "demux_filter". */struct dvb_vb2_ctx { struct vb2_queue vb_q; spinlock_t slock; struct list_head dvb_q; struct dvb_buffer *buf; int offset; int remain; int state; int buf_siz; int buf_cnt; int nonblocking;
enum dmx_buffer_flags flags; u32 count;
char name[DVB_VB2_NAME_MAX + 1];};
#ifndef CONFIG_DVB_MMAPstatic inline int dvb_vb2_init(struct dvb_vb2_ctx *ctx, const char *name, struct mutex *mutex, int non_blocking){ return 0;};static inline int dvb_vb2_release(struct dvb_vb2_ctx *ctx){ return 0;};#define dvb_vb2_is_streaming(ctx) (0)#define dvb_vb2_fill_buffer(ctx, file, wait, flags, flush) (0)
static inline __poll_t dvb_vb2_poll(struct dvb_vb2_ctx *ctx, struct file *file, poll_table *wait){ return 0;}#else/** * dvb_vb2_init - initializes VB2 handler * * @ctx: control struct for VB2 handler * @name: name for the VB2 handler * @mutex: pointer to the mutex that serializes vb2 ioctls * @non_blocking: * if not zero, it means that the device is at non-blocking mode */int dvb_vb2_init(struct dvb_vb2_ctx *ctx, const char *name, struct mutex *mutex, int non_blocking);
/** * dvb_vb2_release - Releases the VB2 handler allocated resources and * put @ctx at DVB_VB2_STATE_NONE state. * @ctx: control struct for VB2 handler */int dvb_vb2_release(struct dvb_vb2_ctx *ctx);
/** * dvb_vb2_is_streaming - checks if the VB2 handler is streaming * @ctx: control struct for VB2 handler * * Return: 0 if not streaming, 1 otherwise. */int dvb_vb2_is_streaming(struct dvb_vb2_ctx *ctx);
/** * dvb_vb2_fill_buffer - fills a VB2 buffer * @ctx: control struct for VB2 handler * @src: place where the data is stored * @len: number of bytes to be copied from @src * @buffer_flags: * pointer to buffer flags as defined by &enum dmx_buffer_flags. * can be NULL. * @flush: flush the buffer, even if it isn't full. */int dvb_vb2_fill_buffer(struct dvb_vb2_ctx *ctx, const unsigned char *src, int len, enum dmx_buffer_flags *buffer_flags, bool flush);
/** * dvb_vb2_poll - Wrapper to vb2_core_streamon() for Digital TV * buffer handling. * * @ctx: control struct for VB2 handler * @file: &struct file argument passed to the poll * file operation handler. * @wait: &poll_table wait argument passed to the poll * file operation handler. * * Implements poll syscall() logic. */__poll_t dvb_vb2_poll(struct dvb_vb2_ctx *ctx, struct file *file, poll_table *wait);#endif
/** * dvb_vb2_stream_on() - Wrapper to vb2_core_streamon() for Digital TV * buffer handling. * * @ctx: control struct for VB2 handler * * Starts dvb streaming */int dvb_vb2_stream_on(struct dvb_vb2_ctx *ctx);/** * dvb_vb2_stream_off() - Wrapper to vb2_core_streamoff() for Digital TV * buffer handling. * * @ctx: control struct for VB2 handler * * Stops dvb streaming */int dvb_vb2_stream_off(struct dvb_vb2_ctx *ctx);
/** * dvb_vb2_reqbufs() - Wrapper to vb2_core_reqbufs() for Digital TV * buffer handling. * * @ctx: control struct for VB2 handler * @req: &struct dmx_requestbuffers passed from userspace in * order to handle &DMX_REQBUFS. * * Initiate streaming by requesting a number of buffers. Also used to * free previously requested buffers, is ``req->count`` is zero. */int dvb_vb2_reqbufs(struct dvb_vb2_ctx *ctx, struct dmx_requestbuffers *req);
/** * dvb_vb2_querybuf() - Wrapper to vb2_core_querybuf() for Digital TV * buffer handling. * * @ctx: control struct for VB2 handler * @b: &struct dmx_buffer passed from userspace in * order to handle &DMX_QUERYBUF. * * */int dvb_vb2_querybuf(struct dvb_vb2_ctx *ctx, struct dmx_buffer *b);
/** * dvb_vb2_expbuf() - Wrapper to vb2_core_expbuf() for Digital TV * buffer handling. * * @ctx: control struct for VB2 handler * @exp: &struct dmx_exportbuffer passed from userspace in * order to handle &DMX_EXPBUF. * * Export a buffer as a file descriptor. */int dvb_vb2_expbuf(struct dvb_vb2_ctx *ctx, struct dmx_exportbuffer *exp);
/** * dvb_vb2_qbuf() - Wrapper to vb2_core_qbuf() for Digital TV buffer handling. * * @ctx: control struct for VB2 handler * @b: &struct dmx_buffer passed from userspace in * order to handle &DMX_QBUF. * * Queue a Digital TV buffer as requested by userspace */int dvb_vb2_qbuf(struct dvb_vb2_ctx *ctx, struct dmx_buffer *b);
/** * dvb_vb2_dqbuf() - Wrapper to vb2_core_dqbuf() for Digital TV * buffer handling. * * @ctx: control struct for VB2 handler * @b: &struct dmx_buffer passed from userspace in * order to handle &DMX_DQBUF. * * Dequeue a Digital TV buffer to the userspace */int dvb_vb2_dqbuf(struct dvb_vb2_ctx *ctx, struct dmx_buffer *b);
/** * dvb_vb2_mmap() - Wrapper to vb2_mmap() for Digital TV buffer handling. * * @ctx: control struct for VB2 handler * @vma: pointer to &struct vm_area_struct with the vma passed * to the mmap file operation handler in the driver. * * map Digital TV video buffers into application address space. */int dvb_vb2_mmap(struct dvb_vb2_ctx *ctx, struct vm_area_struct *vma);
#endif /* _DVB_VB2_H */