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442 lines
10 KiB
442 lines
10 KiB
// SPDX-License-Identifier: GPL-2.0 |
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/* |
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* dvb-vb2.c - dvb-vb2 |
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* |
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* Copyright (C) 2015 Samsung Electronics |
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* |
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* Author: [email protected] |
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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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#include <linux/err.h> |
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#include <linux/kernel.h> |
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#include <linux/module.h> |
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#include <linux/mm.h> |
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#include <media/dvbdev.h> |
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#include <media/dvb_vb2.h> |
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#define DVB_V2_MAX_SIZE (4096 * 188) |
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static int vb2_debug; |
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module_param(vb2_debug, int, 0644); |
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#define dprintk(level, fmt, arg...) \ |
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do { \ |
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if (vb2_debug >= level) \ |
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pr_info("vb2: %s: " fmt, __func__, ## arg); \ |
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} while (0) |
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static int _queue_setup(struct vb2_queue *vq, |
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unsigned int *nbuffers, unsigned int *nplanes, |
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unsigned int sizes[], struct device *alloc_devs[]) |
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{ |
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struct dvb_vb2_ctx *ctx = vb2_get_drv_priv(vq); |
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ctx->buf_cnt = *nbuffers; |
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*nplanes = 1; |
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sizes[0] = ctx->buf_siz; |
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/* |
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* videobuf2-vmalloc allocator is context-less so no need to set |
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* alloc_ctxs array. |
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*/ |
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dprintk(3, "[%s] count=%d, size=%d\n", ctx->name, |
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*nbuffers, sizes[0]); |
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return 0; |
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} |
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static int _buffer_prepare(struct vb2_buffer *vb) |
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{ |
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struct dvb_vb2_ctx *ctx = vb2_get_drv_priv(vb->vb2_queue); |
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unsigned long size = ctx->buf_siz; |
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if (vb2_plane_size(vb, 0) < size) { |
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dprintk(1, "[%s] data will not fit into plane (%lu < %lu)\n", |
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ctx->name, vb2_plane_size(vb, 0), size); |
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return -EINVAL; |
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} |
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vb2_set_plane_payload(vb, 0, size); |
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dprintk(3, "[%s]\n", ctx->name); |
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return 0; |
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} |
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static void _buffer_queue(struct vb2_buffer *vb) |
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{ |
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struct dvb_vb2_ctx *ctx = vb2_get_drv_priv(vb->vb2_queue); |
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struct dvb_buffer *buf = container_of(vb, struct dvb_buffer, vb); |
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unsigned long flags = 0; |
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spin_lock_irqsave(&ctx->slock, flags); |
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list_add_tail(&buf->list, &ctx->dvb_q); |
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spin_unlock_irqrestore(&ctx->slock, flags); |
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dprintk(3, "[%s]\n", ctx->name); |
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} |
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static int _start_streaming(struct vb2_queue *vq, unsigned int count) |
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{ |
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struct dvb_vb2_ctx *ctx = vb2_get_drv_priv(vq); |
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dprintk(3, "[%s] count=%d\n", ctx->name, count); |
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return 0; |
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} |
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static void _stop_streaming(struct vb2_queue *vq) |
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{ |
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struct dvb_vb2_ctx *ctx = vb2_get_drv_priv(vq); |
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struct dvb_buffer *buf; |
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unsigned long flags = 0; |
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dprintk(3, "[%s]\n", ctx->name); |
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spin_lock_irqsave(&ctx->slock, flags); |
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while (!list_empty(&ctx->dvb_q)) { |
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buf = list_entry(ctx->dvb_q.next, |
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struct dvb_buffer, list); |
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vb2_buffer_done(&buf->vb, VB2_BUF_STATE_ERROR); |
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list_del(&buf->list); |
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} |
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spin_unlock_irqrestore(&ctx->slock, flags); |
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} |
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static void _dmxdev_lock(struct vb2_queue *vq) |
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{ |
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struct dvb_vb2_ctx *ctx = vb2_get_drv_priv(vq); |
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mutex_lock(&ctx->mutex); |
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dprintk(3, "[%s]\n", ctx->name); |
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} |
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static void _dmxdev_unlock(struct vb2_queue *vq) |
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{ |
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struct dvb_vb2_ctx *ctx = vb2_get_drv_priv(vq); |
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if (mutex_is_locked(&ctx->mutex)) |
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mutex_unlock(&ctx->mutex); |
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dprintk(3, "[%s]\n", ctx->name); |
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} |
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static const struct vb2_ops dvb_vb2_qops = { |
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.queue_setup = _queue_setup, |
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.buf_prepare = _buffer_prepare, |
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.buf_queue = _buffer_queue, |
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.start_streaming = _start_streaming, |
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.stop_streaming = _stop_streaming, |
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.wait_prepare = _dmxdev_unlock, |
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.wait_finish = _dmxdev_lock, |
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}; |
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static void _fill_dmx_buffer(struct vb2_buffer *vb, void *pb) |
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{ |
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struct dvb_vb2_ctx *ctx = vb2_get_drv_priv(vb->vb2_queue); |
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struct dmx_buffer *b = pb; |
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b->index = vb->index; |
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b->length = vb->planes[0].length; |
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b->bytesused = vb->planes[0].bytesused; |
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b->offset = vb->planes[0].m.offset; |
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dprintk(3, "[%s]\n", ctx->name); |
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} |
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static int _fill_vb2_buffer(struct vb2_buffer *vb, struct vb2_plane *planes) |
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{ |
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struct dvb_vb2_ctx *ctx = vb2_get_drv_priv(vb->vb2_queue); |
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planes[0].bytesused = 0; |
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dprintk(3, "[%s]\n", ctx->name); |
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return 0; |
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} |
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static const struct vb2_buf_ops dvb_vb2_buf_ops = { |
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.fill_user_buffer = _fill_dmx_buffer, |
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.fill_vb2_buffer = _fill_vb2_buffer, |
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}; |
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/* |
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* Videobuf operations |
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*/ |
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int dvb_vb2_init(struct dvb_vb2_ctx *ctx, const char *name, int nonblocking) |
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{ |
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struct vb2_queue *q = &ctx->vb_q; |
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int ret; |
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memset(ctx, 0, sizeof(struct dvb_vb2_ctx)); |
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q->type = DVB_BUF_TYPE_CAPTURE; |
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/**capture type*/ |
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q->is_output = 0; |
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/**only mmap is supported currently*/ |
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q->io_modes = VB2_MMAP; |
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q->drv_priv = ctx; |
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q->buf_struct_size = sizeof(struct dvb_buffer); |
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q->min_buffers_needed = 1; |
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q->ops = &dvb_vb2_qops; |
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q->mem_ops = &vb2_vmalloc_memops; |
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q->buf_ops = &dvb_vb2_buf_ops; |
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q->num_buffers = 0; |
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ret = vb2_core_queue_init(q); |
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if (ret) { |
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ctx->state = DVB_VB2_STATE_NONE; |
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dprintk(1, "[%s] errno=%d\n", ctx->name, ret); |
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return ret; |
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} |
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mutex_init(&ctx->mutex); |
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spin_lock_init(&ctx->slock); |
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INIT_LIST_HEAD(&ctx->dvb_q); |
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strscpy(ctx->name, name, DVB_VB2_NAME_MAX); |
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ctx->nonblocking = nonblocking; |
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ctx->state = DVB_VB2_STATE_INIT; |
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dprintk(3, "[%s]\n", ctx->name); |
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return 0; |
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} |
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int dvb_vb2_release(struct dvb_vb2_ctx *ctx) |
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{ |
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struct vb2_queue *q = (struct vb2_queue *)&ctx->vb_q; |
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if (ctx->state & DVB_VB2_STATE_INIT) |
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vb2_core_queue_release(q); |
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ctx->state = DVB_VB2_STATE_NONE; |
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dprintk(3, "[%s]\n", ctx->name); |
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return 0; |
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} |
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int dvb_vb2_stream_on(struct dvb_vb2_ctx *ctx) |
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{ |
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struct vb2_queue *q = &ctx->vb_q; |
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int ret; |
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ret = vb2_core_streamon(q, q->type); |
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if (ret) { |
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ctx->state = DVB_VB2_STATE_NONE; |
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dprintk(1, "[%s] errno=%d\n", ctx->name, ret); |
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return ret; |
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} |
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ctx->state |= DVB_VB2_STATE_STREAMON; |
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dprintk(3, "[%s]\n", ctx->name); |
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return 0; |
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} |
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int dvb_vb2_stream_off(struct dvb_vb2_ctx *ctx) |
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{ |
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struct vb2_queue *q = (struct vb2_queue *)&ctx->vb_q; |
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int ret; |
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ctx->state &= ~DVB_VB2_STATE_STREAMON; |
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ret = vb2_core_streamoff(q, q->type); |
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if (ret) { |
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ctx->state = DVB_VB2_STATE_NONE; |
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dprintk(1, "[%s] errno=%d\n", ctx->name, ret); |
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return ret; |
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} |
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dprintk(3, "[%s]\n", ctx->name); |
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return 0; |
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} |
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int dvb_vb2_is_streaming(struct dvb_vb2_ctx *ctx) |
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{ |
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return (ctx->state & DVB_VB2_STATE_STREAMON); |
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} |
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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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enum dmx_buffer_flags *buffer_flags) |
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{ |
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unsigned long flags = 0; |
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void *vbuf = NULL; |
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int todo = len; |
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unsigned char *psrc = (unsigned char *)src; |
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int ll = 0; |
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/* |
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* normal case: This func is called twice from demux driver |
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* one with valid src pointer, second time with NULL pointer |
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*/ |
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if (!src || !len) |
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return 0; |
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spin_lock_irqsave(&ctx->slock, flags); |
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if (buffer_flags && *buffer_flags) { |
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ctx->flags |= *buffer_flags; |
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*buffer_flags = 0; |
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} |
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while (todo) { |
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if (!ctx->buf) { |
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if (list_empty(&ctx->dvb_q)) { |
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dprintk(3, "[%s] Buffer overflow!!!\n", |
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ctx->name); |
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break; |
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} |
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ctx->buf = list_entry(ctx->dvb_q.next, |
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struct dvb_buffer, list); |
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ctx->remain = vb2_plane_size(&ctx->buf->vb, 0); |
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ctx->offset = 0; |
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} |
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if (!dvb_vb2_is_streaming(ctx)) { |
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vb2_buffer_done(&ctx->buf->vb, VB2_BUF_STATE_ERROR); |
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list_del(&ctx->buf->list); |
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ctx->buf = NULL; |
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break; |
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} |
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/* Fill buffer */ |
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ll = min(todo, ctx->remain); |
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vbuf = vb2_plane_vaddr(&ctx->buf->vb, 0); |
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memcpy(vbuf + ctx->offset, psrc, ll); |
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todo -= ll; |
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psrc += ll; |
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ctx->remain -= ll; |
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ctx->offset += ll; |
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if (ctx->remain == 0) { |
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vb2_buffer_done(&ctx->buf->vb, VB2_BUF_STATE_DONE); |
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list_del(&ctx->buf->list); |
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ctx->buf = NULL; |
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} |
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} |
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if (ctx->nonblocking && ctx->buf) { |
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vb2_set_plane_payload(&ctx->buf->vb, 0, ll); |
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vb2_buffer_done(&ctx->buf->vb, VB2_BUF_STATE_DONE); |
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list_del(&ctx->buf->list); |
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ctx->buf = NULL; |
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} |
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spin_unlock_irqrestore(&ctx->slock, flags); |
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if (todo) |
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dprintk(1, "[%s] %d bytes are dropped.\n", ctx->name, todo); |
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else |
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dprintk(3, "[%s]\n", ctx->name); |
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dprintk(3, "[%s] %d bytes are copied\n", ctx->name, len - todo); |
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return (len - todo); |
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} |
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int dvb_vb2_reqbufs(struct dvb_vb2_ctx *ctx, struct dmx_requestbuffers *req) |
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{ |
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int ret; |
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/* Adjust size to a sane value */ |
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if (req->size > DVB_V2_MAX_SIZE) |
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req->size = DVB_V2_MAX_SIZE; |
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/* FIXME: round req->size to a 188 or 204 multiple */ |
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ctx->buf_siz = req->size; |
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ctx->buf_cnt = req->count; |
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ret = vb2_core_reqbufs(&ctx->vb_q, VB2_MEMORY_MMAP, &req->count); |
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if (ret) { |
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ctx->state = DVB_VB2_STATE_NONE; |
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dprintk(1, "[%s] count=%d size=%d errno=%d\n", ctx->name, |
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ctx->buf_cnt, ctx->buf_siz, ret); |
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return ret; |
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} |
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ctx->state |= DVB_VB2_STATE_REQBUFS; |
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dprintk(3, "[%s] count=%d size=%d\n", ctx->name, |
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ctx->buf_cnt, ctx->buf_siz); |
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return 0; |
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} |
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int dvb_vb2_querybuf(struct dvb_vb2_ctx *ctx, struct dmx_buffer *b) |
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{ |
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vb2_core_querybuf(&ctx->vb_q, b->index, b); |
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dprintk(3, "[%s] index=%d\n", ctx->name, b->index); |
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return 0; |
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} |
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int dvb_vb2_expbuf(struct dvb_vb2_ctx *ctx, struct dmx_exportbuffer *exp) |
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{ |
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struct vb2_queue *q = &ctx->vb_q; |
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int ret; |
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ret = vb2_core_expbuf(&ctx->vb_q, &exp->fd, q->type, exp->index, |
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0, exp->flags); |
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if (ret) { |
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dprintk(1, "[%s] index=%d errno=%d\n", ctx->name, |
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exp->index, ret); |
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return ret; |
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} |
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dprintk(3, "[%s] index=%d fd=%d\n", ctx->name, exp->index, exp->fd); |
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return 0; |
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} |
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int dvb_vb2_qbuf(struct dvb_vb2_ctx *ctx, struct dmx_buffer *b) |
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{ |
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int ret; |
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ret = vb2_core_qbuf(&ctx->vb_q, b->index, b, NULL); |
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if (ret) { |
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dprintk(1, "[%s] index=%d errno=%d\n", ctx->name, |
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b->index, ret); |
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return ret; |
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} |
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dprintk(5, "[%s] index=%d\n", ctx->name, b->index); |
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return 0; |
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} |
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int dvb_vb2_dqbuf(struct dvb_vb2_ctx *ctx, struct dmx_buffer *b) |
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{ |
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unsigned long flags; |
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int ret; |
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ret = vb2_core_dqbuf(&ctx->vb_q, &b->index, b, ctx->nonblocking); |
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if (ret) { |
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dprintk(1, "[%s] errno=%d\n", ctx->name, ret); |
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return ret; |
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} |
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spin_lock_irqsave(&ctx->slock, flags); |
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b->count = ctx->count++; |
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b->flags = ctx->flags; |
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ctx->flags = 0; |
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spin_unlock_irqrestore(&ctx->slock, flags); |
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dprintk(5, "[%s] index=%d, count=%d, flags=%d\n", |
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ctx->name, b->index, ctx->count, b->flags); |
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return 0; |
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} |
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int dvb_vb2_mmap(struct dvb_vb2_ctx *ctx, struct vm_area_struct *vma) |
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{ |
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int ret; |
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ret = vb2_mmap(&ctx->vb_q, vma); |
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if (ret) { |
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dprintk(1, "[%s] errno=%d\n", ctx->name, ret); |
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return ret; |
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} |
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dprintk(3, "[%s] ret=%d\n", ctx->name, ret); |
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return 0; |
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} |
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__poll_t dvb_vb2_poll(struct dvb_vb2_ctx *ctx, struct file *file, |
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poll_table *wait) |
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{ |
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dprintk(3, "[%s]\n", ctx->name); |
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return vb2_core_poll(&ctx->vb_q, file, wait); |
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} |
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