57868acc36
Adds a new uAPI for DVB to use streaming I/O which is implemented based on videobuf2, using those new ioctls: - DMX_REQBUFS: Request kernel to allocate buffers which count and size are dedicated by user. - DMX_QUERYBUF: Get the buffer information like a memory offset which will mmap() and be shared with user-space. - DMX_EXPBUF: Just for testing whether buffer-exporting success or not. - DMX_QBUF: Pass the buffer to kernel-space. - DMX_DQBUF: Get back the buffer which may contain TS data. Originally developed by: Junghak Sung <jh1009.sung@samsung.com>, as seen at: https://patchwork.linuxtv.org/patch/31613/ https://patchwork.kernel.org/patch/7334301/ The original patch was written before merging VB2-core functionalities upstream. When such series was added, several adjustments were made, fixing some issues with V4L2, causing the original patch to be non-trivially rebased. After rebased, a few bugs in the patch were fixed. The patch was also enhanced it and polling functionality got added. The main changes over the original patch are: dvb_vb2_fill_buffer(): - Set the size of the outgoing buffer after while loop using vb2_set_plane_payload; - Added NULL check for source buffer as per normal convention of demux driver, this is called twice, first time with valid buffer second time with NULL pointer, if its not handled, it will result in crash - Restricted spinlock for only list_* operations dvb_vb2_init(): - Restricted q->io_modes to only VB2_MMAP as its the only supported mode dvb_vb2_release(): - Replaced the && in if condiion with &, because otherwise it was always getting satisfied. dvb_vb2_stream_off(): - Added list_del code for enqueud buffers upon stream off dvb_vb2_poll(): - Added this new function in order to support polling dvb_demux_poll() and dvb_dvr_poll() - dvb_vb2_poll() is now called from these functions - Ported this patch and latest videobuf2 to lower kernel versions and tested auto scan. Co-developed-by: Junghak Sung <jh1009.sung@samsung.com> [mchehab@s-opensource.com: checkpatch fixes] Signed-off-by: Junghak Sung <jh1009.sung@samsung.com> Signed-off-by: Geunyoung Kim <nenggun.kim@samsung.com> Acked-by: Seung-Woo Kim <sw0312.kim@samsung.com> Acked-by: Inki Dae <inki.dae@samsung.com> Signed-off-by: Satendra Singh Thakur <satendra.t@samsung.com> Signed-off-by: Mauro Carvalho Chehab <mchehab@s-opensource.com>
73 lines
2.0 KiB
C
73 lines
2.0 KiB
C
/*
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* dvb-vb2.h - DVB driver helper framework for streaming I/O
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*
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* Copyright (C) 2015 Samsung Electronics
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*
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* Author: jh1009.sung@samsung.com
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation.
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*/
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#ifndef _DVB_VB2_H
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#define _DVB_VB2_H
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#include <linux/mutex.h>
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#include <linux/poll.h>
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#include <linux/dvb/dmx.h>
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#include <media/videobuf2-core.h>
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#include <media/videobuf2-dma-contig.h>
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#include <media/videobuf2-vmalloc.h>
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enum dvb_buf_type {
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DVB_BUF_TYPE_CAPTURE = 1,
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DVB_BUF_TYPE_OUTPUT = 2,
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};
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#define DVB_VB2_STATE_NONE (0x0)
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#define DVB_VB2_STATE_INIT (0x1)
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#define DVB_VB2_STATE_REQBUFS (0x2)
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#define DVB_VB2_STATE_STREAMON (0x4)
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#define DVB_VB2_NAME_MAX (20)
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struct dvb_buffer {
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struct vb2_buffer vb;
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struct list_head list;
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};
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struct dvb_vb2_ctx {
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struct vb2_queue vb_q;
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struct mutex mutex;
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spinlock_t slock;
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struct list_head dvb_q;
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struct dvb_buffer *buf;
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int offset;
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int remain;
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int state;
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int buf_siz;
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int buf_cnt;
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int nonblocking;
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char name[DVB_VB2_NAME_MAX + 1];
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};
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int dvb_vb2_init(struct dvb_vb2_ctx *ctx, const char *name, int non_blocking);
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int dvb_vb2_release(struct dvb_vb2_ctx *ctx);
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int dvb_vb2_stream_on(struct dvb_vb2_ctx *ctx);
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int dvb_vb2_stream_off(struct dvb_vb2_ctx *ctx);
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int dvb_vb2_is_streaming(struct dvb_vb2_ctx *ctx);
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int dvb_vb2_fill_buffer(struct dvb_vb2_ctx *ctx,
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const unsigned char *src, int len);
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int dvb_vb2_reqbufs(struct dvb_vb2_ctx *ctx, struct dmx_requestbuffers *req);
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int dvb_vb2_querybuf(struct dvb_vb2_ctx *ctx, struct dmx_buffer *b);
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int dvb_vb2_expbuf(struct dvb_vb2_ctx *ctx, struct dmx_exportbuffer *exp);
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int dvb_vb2_qbuf(struct dvb_vb2_ctx *ctx, struct dmx_buffer *b);
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int dvb_vb2_dqbuf(struct dvb_vb2_ctx *ctx, struct dmx_buffer *b);
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int dvb_vb2_mmap(struct dvb_vb2_ctx *ctx, struct vm_area_struct *vma);
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unsigned int dvb_vb2_poll(struct dvb_vb2_ctx *ctx, struct file *file,
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poll_table *wait);
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#endif /* _DVB_VB2_H */
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