forked from Minki/linux
2a87af6ba1
While it would be very cool to have those functions using kernel-doc markups, the reality right now is that they don't follow kernel-doc rules, as parameters aren't documented. So, stop abusing on "/**" markups. Signed-off-by: Mauro Carvalho Chehab <mchehab@s-opensource.com>
965 lines
26 KiB
C
965 lines
26 KiB
C
/*
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* videobuf2-v4l2.c - V4L2 driver helper framework
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*
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* Copyright (C) 2010 Samsung Electronics
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*
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* Author: Pawel Osciak <pawel@osciak.com>
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* Marek Szyprowski <m.szyprowski@samsung.com>
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*
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* The vb2_thread implementation was based on code from videobuf-dvb.c:
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* (c) 2004 Gerd Knorr <kraxel@bytesex.org> [SUSE Labs]
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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 <linux/poll.h>
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#include <linux/slab.h>
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#include <linux/sched.h>
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#include <linux/freezer.h>
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#include <linux/kthread.h>
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#include <media/v4l2-dev.h>
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#include <media/v4l2-fh.h>
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#include <media/v4l2-event.h>
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#include <media/v4l2-common.h>
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#include <media/videobuf2-v4l2.h>
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static int debug;
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module_param(debug, int, 0644);
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#define dprintk(level, fmt, arg...) \
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do { \
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if (debug >= level) \
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pr_info("vb2-v4l2: %s: " fmt, __func__, ## arg); \
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} while (0)
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/* Flags that are set by the vb2 core */
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#define V4L2_BUFFER_MASK_FLAGS (V4L2_BUF_FLAG_MAPPED | V4L2_BUF_FLAG_QUEUED | \
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V4L2_BUF_FLAG_DONE | V4L2_BUF_FLAG_ERROR | \
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V4L2_BUF_FLAG_PREPARED | \
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V4L2_BUF_FLAG_TIMESTAMP_MASK)
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/* Output buffer flags that should be passed on to the driver */
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#define V4L2_BUFFER_OUT_FLAGS (V4L2_BUF_FLAG_PFRAME | V4L2_BUF_FLAG_BFRAME | \
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V4L2_BUF_FLAG_KEYFRAME | V4L2_BUF_FLAG_TIMECODE)
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/*
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* __verify_planes_array() - verify that the planes array passed in struct
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* v4l2_buffer from userspace can be safely used
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*/
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static int __verify_planes_array(struct vb2_buffer *vb, const struct v4l2_buffer *b)
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{
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if (!V4L2_TYPE_IS_MULTIPLANAR(b->type))
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return 0;
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/* Is memory for copying plane information present? */
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if (b->m.planes == NULL) {
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dprintk(1, "multi-planar buffer passed but planes array not provided\n");
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return -EINVAL;
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}
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if (b->length < vb->num_planes || b->length > VB2_MAX_PLANES) {
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dprintk(1, "incorrect planes array length, expected %d, got %d\n",
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vb->num_planes, b->length);
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return -EINVAL;
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}
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return 0;
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}
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static int __verify_planes_array_core(struct vb2_buffer *vb, const void *pb)
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{
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return __verify_planes_array(vb, pb);
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}
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/*
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* __verify_length() - Verify that the bytesused value for each plane fits in
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* the plane length and that the data offset doesn't exceed the bytesused value.
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*/
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static int __verify_length(struct vb2_buffer *vb, const struct v4l2_buffer *b)
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{
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unsigned int length;
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unsigned int bytesused;
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unsigned int plane;
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if (!V4L2_TYPE_IS_OUTPUT(b->type))
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return 0;
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if (V4L2_TYPE_IS_MULTIPLANAR(b->type)) {
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for (plane = 0; plane < vb->num_planes; ++plane) {
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length = (b->memory == VB2_MEMORY_USERPTR ||
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b->memory == VB2_MEMORY_DMABUF)
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? b->m.planes[plane].length
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: vb->planes[plane].length;
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bytesused = b->m.planes[plane].bytesused
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? b->m.planes[plane].bytesused : length;
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if (b->m.planes[plane].bytesused > length)
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return -EINVAL;
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if (b->m.planes[plane].data_offset > 0 &&
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b->m.planes[plane].data_offset >= bytesused)
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return -EINVAL;
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}
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} else {
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length = (b->memory == VB2_MEMORY_USERPTR)
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? b->length : vb->planes[0].length;
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if (b->bytesused > length)
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return -EINVAL;
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}
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return 0;
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}
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static void __copy_timestamp(struct vb2_buffer *vb, const void *pb)
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{
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const struct v4l2_buffer *b = pb;
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struct vb2_v4l2_buffer *vbuf = to_vb2_v4l2_buffer(vb);
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struct vb2_queue *q = vb->vb2_queue;
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if (q->is_output) {
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/*
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* For output buffers copy the timestamp if needed,
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* and the timecode field and flag if needed.
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*/
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if (q->copy_timestamp)
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vb->timestamp = timeval_to_ns(&b->timestamp);
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vbuf->flags |= b->flags & V4L2_BUF_FLAG_TIMECODE;
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if (b->flags & V4L2_BUF_FLAG_TIMECODE)
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vbuf->timecode = b->timecode;
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}
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};
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static void vb2_warn_zero_bytesused(struct vb2_buffer *vb)
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{
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static bool check_once;
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if (check_once)
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return;
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check_once = true;
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WARN_ON(1);
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pr_warn("use of bytesused == 0 is deprecated and will be removed in the future,\n");
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if (vb->vb2_queue->allow_zero_bytesused)
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pr_warn("use VIDIOC_DECODER_CMD(V4L2_DEC_CMD_STOP) instead.\n");
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else
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pr_warn("use the actual size instead.\n");
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}
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static int vb2_queue_or_prepare_buf(struct vb2_queue *q, struct v4l2_buffer *b,
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const char *opname)
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{
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if (b->type != q->type) {
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dprintk(1, "%s: invalid buffer type\n", opname);
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return -EINVAL;
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}
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if (b->index >= q->num_buffers) {
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dprintk(1, "%s: buffer index out of range\n", opname);
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return -EINVAL;
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}
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if (q->bufs[b->index] == NULL) {
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/* Should never happen */
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dprintk(1, "%s: buffer is NULL\n", opname);
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return -EINVAL;
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}
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if (b->memory != q->memory) {
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dprintk(1, "%s: invalid memory type\n", opname);
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return -EINVAL;
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}
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return __verify_planes_array(q->bufs[b->index], b);
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}
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/*
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* __fill_v4l2_buffer() - fill in a struct v4l2_buffer with information to be
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* returned to userspace
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*/
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static void __fill_v4l2_buffer(struct vb2_buffer *vb, void *pb)
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{
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struct v4l2_buffer *b = pb;
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struct vb2_v4l2_buffer *vbuf = to_vb2_v4l2_buffer(vb);
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struct vb2_queue *q = vb->vb2_queue;
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unsigned int plane;
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/* Copy back data such as timestamp, flags, etc. */
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b->index = vb->index;
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b->type = vb->type;
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b->memory = vb->memory;
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b->bytesused = 0;
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b->flags = vbuf->flags;
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b->field = vbuf->field;
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b->timestamp = ns_to_timeval(vb->timestamp);
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b->timecode = vbuf->timecode;
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b->sequence = vbuf->sequence;
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b->reserved2 = 0;
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b->reserved = 0;
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if (q->is_multiplanar) {
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/*
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* Fill in plane-related data if userspace provided an array
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* for it. The caller has already verified memory and size.
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*/
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b->length = vb->num_planes;
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for (plane = 0; plane < vb->num_planes; ++plane) {
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struct v4l2_plane *pdst = &b->m.planes[plane];
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struct vb2_plane *psrc = &vb->planes[plane];
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pdst->bytesused = psrc->bytesused;
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pdst->length = psrc->length;
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if (q->memory == VB2_MEMORY_MMAP)
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pdst->m.mem_offset = psrc->m.offset;
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else if (q->memory == VB2_MEMORY_USERPTR)
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pdst->m.userptr = psrc->m.userptr;
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else if (q->memory == VB2_MEMORY_DMABUF)
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pdst->m.fd = psrc->m.fd;
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pdst->data_offset = psrc->data_offset;
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memset(pdst->reserved, 0, sizeof(pdst->reserved));
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}
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} else {
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/*
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* We use length and offset in v4l2_planes array even for
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* single-planar buffers, but userspace does not.
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*/
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b->length = vb->planes[0].length;
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b->bytesused = vb->planes[0].bytesused;
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if (q->memory == VB2_MEMORY_MMAP)
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b->m.offset = vb->planes[0].m.offset;
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else if (q->memory == VB2_MEMORY_USERPTR)
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b->m.userptr = vb->planes[0].m.userptr;
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else if (q->memory == VB2_MEMORY_DMABUF)
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b->m.fd = vb->planes[0].m.fd;
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}
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/*
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* Clear any buffer state related flags.
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*/
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b->flags &= ~V4L2_BUFFER_MASK_FLAGS;
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b->flags |= q->timestamp_flags & V4L2_BUF_FLAG_TIMESTAMP_MASK;
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if (!q->copy_timestamp) {
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/*
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* For non-COPY timestamps, drop timestamp source bits
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* and obtain the timestamp source from the queue.
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*/
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b->flags &= ~V4L2_BUF_FLAG_TSTAMP_SRC_MASK;
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b->flags |= q->timestamp_flags & V4L2_BUF_FLAG_TSTAMP_SRC_MASK;
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}
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switch (vb->state) {
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case VB2_BUF_STATE_QUEUED:
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case VB2_BUF_STATE_ACTIVE:
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b->flags |= V4L2_BUF_FLAG_QUEUED;
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break;
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case VB2_BUF_STATE_ERROR:
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b->flags |= V4L2_BUF_FLAG_ERROR;
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/* fall through */
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case VB2_BUF_STATE_DONE:
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b->flags |= V4L2_BUF_FLAG_DONE;
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break;
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case VB2_BUF_STATE_PREPARED:
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b->flags |= V4L2_BUF_FLAG_PREPARED;
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break;
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case VB2_BUF_STATE_PREPARING:
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case VB2_BUF_STATE_DEQUEUED:
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case VB2_BUF_STATE_REQUEUEING:
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/* nothing */
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break;
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}
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if (vb2_buffer_in_use(q, vb))
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b->flags |= V4L2_BUF_FLAG_MAPPED;
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if (!q->is_output &&
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b->flags & V4L2_BUF_FLAG_DONE &&
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b->flags & V4L2_BUF_FLAG_LAST)
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q->last_buffer_dequeued = true;
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}
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/*
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* __fill_vb2_buffer() - fill a vb2_buffer with information provided in a
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* v4l2_buffer by the userspace. It also verifies that struct
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* v4l2_buffer has a valid number of planes.
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*/
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static int __fill_vb2_buffer(struct vb2_buffer *vb,
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const void *pb, struct vb2_plane *planes)
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{
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struct vb2_queue *q = vb->vb2_queue;
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const struct v4l2_buffer *b = pb;
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struct vb2_v4l2_buffer *vbuf = to_vb2_v4l2_buffer(vb);
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unsigned int plane;
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int ret;
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ret = __verify_length(vb, b);
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if (ret < 0) {
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dprintk(1, "plane parameters verification failed: %d\n", ret);
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return ret;
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}
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if (b->field == V4L2_FIELD_ALTERNATE && q->is_output) {
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/*
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* If the format's field is ALTERNATE, then the buffer's field
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* should be either TOP or BOTTOM, not ALTERNATE since that
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* makes no sense. The driver has to know whether the
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* buffer represents a top or a bottom field in order to
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* program any DMA correctly. Using ALTERNATE is wrong, since
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* that just says that it is either a top or a bottom field,
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* but not which of the two it is.
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*/
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dprintk(1, "the field is incorrectly set to ALTERNATE for an output buffer\n");
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return -EINVAL;
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}
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vb->timestamp = 0;
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vbuf->sequence = 0;
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if (V4L2_TYPE_IS_MULTIPLANAR(b->type)) {
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if (b->memory == VB2_MEMORY_USERPTR) {
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for (plane = 0; plane < vb->num_planes; ++plane) {
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planes[plane].m.userptr =
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b->m.planes[plane].m.userptr;
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planes[plane].length =
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b->m.planes[plane].length;
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}
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}
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if (b->memory == VB2_MEMORY_DMABUF) {
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for (plane = 0; plane < vb->num_planes; ++plane) {
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planes[plane].m.fd =
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b->m.planes[plane].m.fd;
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planes[plane].length =
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b->m.planes[plane].length;
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}
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}
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/* Fill in driver-provided information for OUTPUT types */
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if (V4L2_TYPE_IS_OUTPUT(b->type)) {
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/*
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* Will have to go up to b->length when API starts
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* accepting variable number of planes.
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*
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* If bytesused == 0 for the output buffer, then fall
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* back to the full buffer size. In that case
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* userspace clearly never bothered to set it and
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* it's a safe assumption that they really meant to
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* use the full plane sizes.
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*
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* Some drivers, e.g. old codec drivers, use bytesused == 0
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* as a way to indicate that streaming is finished.
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* In that case, the driver should use the
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* allow_zero_bytesused flag to keep old userspace
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* applications working.
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*/
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for (plane = 0; plane < vb->num_planes; ++plane) {
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struct vb2_plane *pdst = &planes[plane];
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struct v4l2_plane *psrc = &b->m.planes[plane];
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if (psrc->bytesused == 0)
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vb2_warn_zero_bytesused(vb);
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if (vb->vb2_queue->allow_zero_bytesused)
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pdst->bytesused = psrc->bytesused;
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else
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pdst->bytesused = psrc->bytesused ?
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psrc->bytesused : pdst->length;
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pdst->data_offset = psrc->data_offset;
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}
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}
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} else {
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/*
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* Single-planar buffers do not use planes array,
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* so fill in relevant v4l2_buffer struct fields instead.
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* In videobuf we use our internal V4l2_planes struct for
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* single-planar buffers as well, for simplicity.
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*
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* If bytesused == 0 for the output buffer, then fall back
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* to the full buffer size as that's a sensible default.
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*
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* Some drivers, e.g. old codec drivers, use bytesused == 0 as
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* a way to indicate that streaming is finished. In that case,
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* the driver should use the allow_zero_bytesused flag to keep
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* old userspace applications working.
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*/
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if (b->memory == VB2_MEMORY_USERPTR) {
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planes[0].m.userptr = b->m.userptr;
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planes[0].length = b->length;
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}
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if (b->memory == VB2_MEMORY_DMABUF) {
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planes[0].m.fd = b->m.fd;
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planes[0].length = b->length;
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}
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if (V4L2_TYPE_IS_OUTPUT(b->type)) {
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if (b->bytesused == 0)
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vb2_warn_zero_bytesused(vb);
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if (vb->vb2_queue->allow_zero_bytesused)
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planes[0].bytesused = b->bytesused;
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else
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planes[0].bytesused = b->bytesused ?
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b->bytesused : planes[0].length;
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} else
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planes[0].bytesused = 0;
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}
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/* Zero flags that the vb2 core handles */
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vbuf->flags = b->flags & ~V4L2_BUFFER_MASK_FLAGS;
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if (!vb->vb2_queue->copy_timestamp || !V4L2_TYPE_IS_OUTPUT(b->type)) {
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/*
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* Non-COPY timestamps and non-OUTPUT queues will get
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* their timestamp and timestamp source flags from the
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* queue.
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*/
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vbuf->flags &= ~V4L2_BUF_FLAG_TSTAMP_SRC_MASK;
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}
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if (V4L2_TYPE_IS_OUTPUT(b->type)) {
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/*
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* For output buffers mask out the timecode flag:
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* this will be handled later in vb2_qbuf().
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* The 'field' is valid metadata for this output buffer
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* and so that needs to be copied here.
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*/
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vbuf->flags &= ~V4L2_BUF_FLAG_TIMECODE;
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vbuf->field = b->field;
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} else {
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/* Zero any output buffer flags as this is a capture buffer */
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vbuf->flags &= ~V4L2_BUFFER_OUT_FLAGS;
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}
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return 0;
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}
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static const struct vb2_buf_ops v4l2_buf_ops = {
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.verify_planes_array = __verify_planes_array_core,
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.fill_user_buffer = __fill_v4l2_buffer,
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.fill_vb2_buffer = __fill_vb2_buffer,
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.copy_timestamp = __copy_timestamp,
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};
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/*
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* vb2_querybuf() - query video buffer information
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* @q: videobuf queue
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* @b: buffer struct passed from userspace to vidioc_querybuf handler
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* in driver
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*
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* Should be called from vidioc_querybuf ioctl handler in driver.
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* This function will verify the passed v4l2_buffer structure and fill the
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* relevant information for the userspace.
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*
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* The return values from this function are intended to be directly returned
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* from vidioc_querybuf handler in driver.
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*/
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int vb2_querybuf(struct vb2_queue *q, struct v4l2_buffer *b)
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{
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struct vb2_buffer *vb;
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int ret;
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|
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if (b->type != q->type) {
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dprintk(1, "wrong buffer type\n");
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return -EINVAL;
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}
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|
|
if (b->index >= q->num_buffers) {
|
|
dprintk(1, "buffer index out of range\n");
|
|
return -EINVAL;
|
|
}
|
|
vb = q->bufs[b->index];
|
|
ret = __verify_planes_array(vb, b);
|
|
if (!ret)
|
|
vb2_core_querybuf(q, b->index, b);
|
|
return ret;
|
|
}
|
|
EXPORT_SYMBOL(vb2_querybuf);
|
|
|
|
int vb2_reqbufs(struct vb2_queue *q, struct v4l2_requestbuffers *req)
|
|
{
|
|
int ret = vb2_verify_memory_type(q, req->memory, req->type);
|
|
|
|
return ret ? ret : vb2_core_reqbufs(q, req->memory, &req->count);
|
|
}
|
|
EXPORT_SYMBOL_GPL(vb2_reqbufs);
|
|
|
|
int vb2_prepare_buf(struct vb2_queue *q, struct v4l2_buffer *b)
|
|
{
|
|
int ret;
|
|
|
|
if (vb2_fileio_is_active(q)) {
|
|
dprintk(1, "file io in progress\n");
|
|
return -EBUSY;
|
|
}
|
|
|
|
ret = vb2_queue_or_prepare_buf(q, b, "prepare_buf");
|
|
|
|
return ret ? ret : vb2_core_prepare_buf(q, b->index, b);
|
|
}
|
|
EXPORT_SYMBOL_GPL(vb2_prepare_buf);
|
|
|
|
int vb2_create_bufs(struct vb2_queue *q, struct v4l2_create_buffers *create)
|
|
{
|
|
unsigned requested_planes = 1;
|
|
unsigned requested_sizes[VIDEO_MAX_PLANES];
|
|
struct v4l2_format *f = &create->format;
|
|
int ret = vb2_verify_memory_type(q, create->memory, f->type);
|
|
unsigned i;
|
|
|
|
create->index = q->num_buffers;
|
|
if (create->count == 0)
|
|
return ret != -EBUSY ? ret : 0;
|
|
|
|
switch (f->type) {
|
|
case V4L2_BUF_TYPE_VIDEO_CAPTURE_MPLANE:
|
|
case V4L2_BUF_TYPE_VIDEO_OUTPUT_MPLANE:
|
|
requested_planes = f->fmt.pix_mp.num_planes;
|
|
if (requested_planes == 0 ||
|
|
requested_planes > VIDEO_MAX_PLANES)
|
|
return -EINVAL;
|
|
for (i = 0; i < requested_planes; i++)
|
|
requested_sizes[i] =
|
|
f->fmt.pix_mp.plane_fmt[i].sizeimage;
|
|
break;
|
|
case V4L2_BUF_TYPE_VIDEO_CAPTURE:
|
|
case V4L2_BUF_TYPE_VIDEO_OUTPUT:
|
|
requested_sizes[0] = f->fmt.pix.sizeimage;
|
|
break;
|
|
case V4L2_BUF_TYPE_VBI_CAPTURE:
|
|
case V4L2_BUF_TYPE_VBI_OUTPUT:
|
|
requested_sizes[0] = f->fmt.vbi.samples_per_line *
|
|
(f->fmt.vbi.count[0] + f->fmt.vbi.count[1]);
|
|
break;
|
|
case V4L2_BUF_TYPE_SLICED_VBI_CAPTURE:
|
|
case V4L2_BUF_TYPE_SLICED_VBI_OUTPUT:
|
|
requested_sizes[0] = f->fmt.sliced.io_size;
|
|
break;
|
|
case V4L2_BUF_TYPE_SDR_CAPTURE:
|
|
case V4L2_BUF_TYPE_SDR_OUTPUT:
|
|
requested_sizes[0] = f->fmt.sdr.buffersize;
|
|
break;
|
|
case V4L2_BUF_TYPE_META_CAPTURE:
|
|
requested_sizes[0] = f->fmt.meta.buffersize;
|
|
break;
|
|
default:
|
|
return -EINVAL;
|
|
}
|
|
for (i = 0; i < requested_planes; i++)
|
|
if (requested_sizes[i] == 0)
|
|
return -EINVAL;
|
|
return ret ? ret : vb2_core_create_bufs(q, create->memory,
|
|
&create->count, requested_planes, requested_sizes);
|
|
}
|
|
EXPORT_SYMBOL_GPL(vb2_create_bufs);
|
|
|
|
int vb2_qbuf(struct vb2_queue *q, struct v4l2_buffer *b)
|
|
{
|
|
int ret;
|
|
|
|
if (vb2_fileio_is_active(q)) {
|
|
dprintk(1, "file io in progress\n");
|
|
return -EBUSY;
|
|
}
|
|
|
|
ret = vb2_queue_or_prepare_buf(q, b, "qbuf");
|
|
return ret ? ret : vb2_core_qbuf(q, b->index, b);
|
|
}
|
|
EXPORT_SYMBOL_GPL(vb2_qbuf);
|
|
|
|
int vb2_dqbuf(struct vb2_queue *q, struct v4l2_buffer *b, bool nonblocking)
|
|
{
|
|
int ret;
|
|
|
|
if (vb2_fileio_is_active(q)) {
|
|
dprintk(1, "file io in progress\n");
|
|
return -EBUSY;
|
|
}
|
|
|
|
if (b->type != q->type) {
|
|
dprintk(1, "invalid buffer type\n");
|
|
return -EINVAL;
|
|
}
|
|
|
|
ret = vb2_core_dqbuf(q, NULL, b, nonblocking);
|
|
|
|
/*
|
|
* After calling the VIDIOC_DQBUF V4L2_BUF_FLAG_DONE must be
|
|
* cleared.
|
|
*/
|
|
b->flags &= ~V4L2_BUF_FLAG_DONE;
|
|
|
|
return ret;
|
|
}
|
|
EXPORT_SYMBOL_GPL(vb2_dqbuf);
|
|
|
|
int vb2_streamon(struct vb2_queue *q, enum v4l2_buf_type type)
|
|
{
|
|
if (vb2_fileio_is_active(q)) {
|
|
dprintk(1, "file io in progress\n");
|
|
return -EBUSY;
|
|
}
|
|
return vb2_core_streamon(q, type);
|
|
}
|
|
EXPORT_SYMBOL_GPL(vb2_streamon);
|
|
|
|
int vb2_streamoff(struct vb2_queue *q, enum v4l2_buf_type type)
|
|
{
|
|
if (vb2_fileio_is_active(q)) {
|
|
dprintk(1, "file io in progress\n");
|
|
return -EBUSY;
|
|
}
|
|
return vb2_core_streamoff(q, type);
|
|
}
|
|
EXPORT_SYMBOL_GPL(vb2_streamoff);
|
|
|
|
int vb2_expbuf(struct vb2_queue *q, struct v4l2_exportbuffer *eb)
|
|
{
|
|
return vb2_core_expbuf(q, &eb->fd, eb->type, eb->index,
|
|
eb->plane, eb->flags);
|
|
}
|
|
EXPORT_SYMBOL_GPL(vb2_expbuf);
|
|
|
|
int vb2_queue_init(struct vb2_queue *q)
|
|
{
|
|
/*
|
|
* Sanity check
|
|
*/
|
|
if (WARN_ON(!q) ||
|
|
WARN_ON(q->timestamp_flags &
|
|
~(V4L2_BUF_FLAG_TIMESTAMP_MASK |
|
|
V4L2_BUF_FLAG_TSTAMP_SRC_MASK)))
|
|
return -EINVAL;
|
|
|
|
/* Warn that the driver should choose an appropriate timestamp type */
|
|
WARN_ON((q->timestamp_flags & V4L2_BUF_FLAG_TIMESTAMP_MASK) ==
|
|
V4L2_BUF_FLAG_TIMESTAMP_UNKNOWN);
|
|
|
|
/* Warn that vb2_memory should match with v4l2_memory */
|
|
if (WARN_ON(VB2_MEMORY_MMAP != (int)V4L2_MEMORY_MMAP)
|
|
|| WARN_ON(VB2_MEMORY_USERPTR != (int)V4L2_MEMORY_USERPTR)
|
|
|| WARN_ON(VB2_MEMORY_DMABUF != (int)V4L2_MEMORY_DMABUF))
|
|
return -EINVAL;
|
|
|
|
if (q->buf_struct_size == 0)
|
|
q->buf_struct_size = sizeof(struct vb2_v4l2_buffer);
|
|
|
|
q->buf_ops = &v4l2_buf_ops;
|
|
q->is_multiplanar = V4L2_TYPE_IS_MULTIPLANAR(q->type);
|
|
q->is_output = V4L2_TYPE_IS_OUTPUT(q->type);
|
|
q->copy_timestamp = (q->timestamp_flags & V4L2_BUF_FLAG_TIMESTAMP_MASK)
|
|
== V4L2_BUF_FLAG_TIMESTAMP_COPY;
|
|
/*
|
|
* For compatibility with vb1: if QBUF hasn't been called yet, then
|
|
* return POLLERR as well. This only affects capture queues, output
|
|
* queues will always initialize waiting_for_buffers to false.
|
|
*/
|
|
q->quirk_poll_must_check_waiting_for_buffers = true;
|
|
|
|
return vb2_core_queue_init(q);
|
|
}
|
|
EXPORT_SYMBOL_GPL(vb2_queue_init);
|
|
|
|
void vb2_queue_release(struct vb2_queue *q)
|
|
{
|
|
vb2_core_queue_release(q);
|
|
}
|
|
EXPORT_SYMBOL_GPL(vb2_queue_release);
|
|
|
|
unsigned int vb2_poll(struct vb2_queue *q, struct file *file, poll_table *wait)
|
|
{
|
|
struct video_device *vfd = video_devdata(file);
|
|
unsigned long req_events = poll_requested_events(wait);
|
|
unsigned int res = 0;
|
|
|
|
if (test_bit(V4L2_FL_USES_V4L2_FH, &vfd->flags)) {
|
|
struct v4l2_fh *fh = file->private_data;
|
|
|
|
if (v4l2_event_pending(fh))
|
|
res = POLLPRI;
|
|
else if (req_events & POLLPRI)
|
|
poll_wait(file, &fh->wait, wait);
|
|
}
|
|
|
|
return res | vb2_core_poll(q, file, wait);
|
|
}
|
|
EXPORT_SYMBOL_GPL(vb2_poll);
|
|
|
|
/*
|
|
* The following functions are not part of the vb2 core API, but are helper
|
|
* functions that plug into struct v4l2_ioctl_ops, struct v4l2_file_operations
|
|
* and struct vb2_ops.
|
|
* They contain boilerplate code that most if not all drivers have to do
|
|
* and so they simplify the driver code.
|
|
*/
|
|
|
|
/* The queue is busy if there is a owner and you are not that owner. */
|
|
static inline bool vb2_queue_is_busy(struct video_device *vdev, struct file *file)
|
|
{
|
|
return vdev->queue->owner && vdev->queue->owner != file->private_data;
|
|
}
|
|
|
|
/* vb2 ioctl helpers */
|
|
|
|
int vb2_ioctl_reqbufs(struct file *file, void *priv,
|
|
struct v4l2_requestbuffers *p)
|
|
{
|
|
struct video_device *vdev = video_devdata(file);
|
|
int res = vb2_verify_memory_type(vdev->queue, p->memory, p->type);
|
|
|
|
if (res)
|
|
return res;
|
|
if (vb2_queue_is_busy(vdev, file))
|
|
return -EBUSY;
|
|
res = vb2_core_reqbufs(vdev->queue, p->memory, &p->count);
|
|
/* If count == 0, then the owner has released all buffers and he
|
|
is no longer owner of the queue. Otherwise we have a new owner. */
|
|
if (res == 0)
|
|
vdev->queue->owner = p->count ? file->private_data : NULL;
|
|
return res;
|
|
}
|
|
EXPORT_SYMBOL_GPL(vb2_ioctl_reqbufs);
|
|
|
|
int vb2_ioctl_create_bufs(struct file *file, void *priv,
|
|
struct v4l2_create_buffers *p)
|
|
{
|
|
struct video_device *vdev = video_devdata(file);
|
|
int res = vb2_verify_memory_type(vdev->queue, p->memory,
|
|
p->format.type);
|
|
|
|
p->index = vdev->queue->num_buffers;
|
|
/*
|
|
* If count == 0, then just check if memory and type are valid.
|
|
* Any -EBUSY result from vb2_verify_memory_type can be mapped to 0.
|
|
*/
|
|
if (p->count == 0)
|
|
return res != -EBUSY ? res : 0;
|
|
if (res)
|
|
return res;
|
|
if (vb2_queue_is_busy(vdev, file))
|
|
return -EBUSY;
|
|
|
|
res = vb2_create_bufs(vdev->queue, p);
|
|
if (res == 0)
|
|
vdev->queue->owner = file->private_data;
|
|
return res;
|
|
}
|
|
EXPORT_SYMBOL_GPL(vb2_ioctl_create_bufs);
|
|
|
|
int vb2_ioctl_prepare_buf(struct file *file, void *priv,
|
|
struct v4l2_buffer *p)
|
|
{
|
|
struct video_device *vdev = video_devdata(file);
|
|
|
|
if (vb2_queue_is_busy(vdev, file))
|
|
return -EBUSY;
|
|
return vb2_prepare_buf(vdev->queue, p);
|
|
}
|
|
EXPORT_SYMBOL_GPL(vb2_ioctl_prepare_buf);
|
|
|
|
int vb2_ioctl_querybuf(struct file *file, void *priv, struct v4l2_buffer *p)
|
|
{
|
|
struct video_device *vdev = video_devdata(file);
|
|
|
|
/* No need to call vb2_queue_is_busy(), anyone can query buffers. */
|
|
return vb2_querybuf(vdev->queue, p);
|
|
}
|
|
EXPORT_SYMBOL_GPL(vb2_ioctl_querybuf);
|
|
|
|
int vb2_ioctl_qbuf(struct file *file, void *priv, struct v4l2_buffer *p)
|
|
{
|
|
struct video_device *vdev = video_devdata(file);
|
|
|
|
if (vb2_queue_is_busy(vdev, file))
|
|
return -EBUSY;
|
|
return vb2_qbuf(vdev->queue, p);
|
|
}
|
|
EXPORT_SYMBOL_GPL(vb2_ioctl_qbuf);
|
|
|
|
int vb2_ioctl_dqbuf(struct file *file, void *priv, struct v4l2_buffer *p)
|
|
{
|
|
struct video_device *vdev = video_devdata(file);
|
|
|
|
if (vb2_queue_is_busy(vdev, file))
|
|
return -EBUSY;
|
|
return vb2_dqbuf(vdev->queue, p, file->f_flags & O_NONBLOCK);
|
|
}
|
|
EXPORT_SYMBOL_GPL(vb2_ioctl_dqbuf);
|
|
|
|
int vb2_ioctl_streamon(struct file *file, void *priv, enum v4l2_buf_type i)
|
|
{
|
|
struct video_device *vdev = video_devdata(file);
|
|
|
|
if (vb2_queue_is_busy(vdev, file))
|
|
return -EBUSY;
|
|
return vb2_streamon(vdev->queue, i);
|
|
}
|
|
EXPORT_SYMBOL_GPL(vb2_ioctl_streamon);
|
|
|
|
int vb2_ioctl_streamoff(struct file *file, void *priv, enum v4l2_buf_type i)
|
|
{
|
|
struct video_device *vdev = video_devdata(file);
|
|
|
|
if (vb2_queue_is_busy(vdev, file))
|
|
return -EBUSY;
|
|
return vb2_streamoff(vdev->queue, i);
|
|
}
|
|
EXPORT_SYMBOL_GPL(vb2_ioctl_streamoff);
|
|
|
|
int vb2_ioctl_expbuf(struct file *file, void *priv, struct v4l2_exportbuffer *p)
|
|
{
|
|
struct video_device *vdev = video_devdata(file);
|
|
|
|
if (vb2_queue_is_busy(vdev, file))
|
|
return -EBUSY;
|
|
return vb2_expbuf(vdev->queue, p);
|
|
}
|
|
EXPORT_SYMBOL_GPL(vb2_ioctl_expbuf);
|
|
|
|
/* v4l2_file_operations helpers */
|
|
|
|
int vb2_fop_mmap(struct file *file, struct vm_area_struct *vma)
|
|
{
|
|
struct video_device *vdev = video_devdata(file);
|
|
|
|
return vb2_mmap(vdev->queue, vma);
|
|
}
|
|
EXPORT_SYMBOL_GPL(vb2_fop_mmap);
|
|
|
|
int _vb2_fop_release(struct file *file, struct mutex *lock)
|
|
{
|
|
struct video_device *vdev = video_devdata(file);
|
|
|
|
if (lock)
|
|
mutex_lock(lock);
|
|
if (file->private_data == vdev->queue->owner) {
|
|
vb2_queue_release(vdev->queue);
|
|
vdev->queue->owner = NULL;
|
|
}
|
|
if (lock)
|
|
mutex_unlock(lock);
|
|
return v4l2_fh_release(file);
|
|
}
|
|
EXPORT_SYMBOL_GPL(_vb2_fop_release);
|
|
|
|
int vb2_fop_release(struct file *file)
|
|
{
|
|
struct video_device *vdev = video_devdata(file);
|
|
struct mutex *lock = vdev->queue->lock ? vdev->queue->lock : vdev->lock;
|
|
|
|
return _vb2_fop_release(file, lock);
|
|
}
|
|
EXPORT_SYMBOL_GPL(vb2_fop_release);
|
|
|
|
ssize_t vb2_fop_write(struct file *file, const char __user *buf,
|
|
size_t count, loff_t *ppos)
|
|
{
|
|
struct video_device *vdev = video_devdata(file);
|
|
struct mutex *lock = vdev->queue->lock ? vdev->queue->lock : vdev->lock;
|
|
int err = -EBUSY;
|
|
|
|
if (!(vdev->queue->io_modes & VB2_WRITE))
|
|
return -EINVAL;
|
|
if (lock && mutex_lock_interruptible(lock))
|
|
return -ERESTARTSYS;
|
|
if (vb2_queue_is_busy(vdev, file))
|
|
goto exit;
|
|
err = vb2_write(vdev->queue, buf, count, ppos,
|
|
file->f_flags & O_NONBLOCK);
|
|
if (vdev->queue->fileio)
|
|
vdev->queue->owner = file->private_data;
|
|
exit:
|
|
if (lock)
|
|
mutex_unlock(lock);
|
|
return err;
|
|
}
|
|
EXPORT_SYMBOL_GPL(vb2_fop_write);
|
|
|
|
ssize_t vb2_fop_read(struct file *file, char __user *buf,
|
|
size_t count, loff_t *ppos)
|
|
{
|
|
struct video_device *vdev = video_devdata(file);
|
|
struct mutex *lock = vdev->queue->lock ? vdev->queue->lock : vdev->lock;
|
|
int err = -EBUSY;
|
|
|
|
if (!(vdev->queue->io_modes & VB2_READ))
|
|
return -EINVAL;
|
|
if (lock && mutex_lock_interruptible(lock))
|
|
return -ERESTARTSYS;
|
|
if (vb2_queue_is_busy(vdev, file))
|
|
goto exit;
|
|
err = vb2_read(vdev->queue, buf, count, ppos,
|
|
file->f_flags & O_NONBLOCK);
|
|
if (vdev->queue->fileio)
|
|
vdev->queue->owner = file->private_data;
|
|
exit:
|
|
if (lock)
|
|
mutex_unlock(lock);
|
|
return err;
|
|
}
|
|
EXPORT_SYMBOL_GPL(vb2_fop_read);
|
|
|
|
unsigned int vb2_fop_poll(struct file *file, poll_table *wait)
|
|
{
|
|
struct video_device *vdev = video_devdata(file);
|
|
struct vb2_queue *q = vdev->queue;
|
|
struct mutex *lock = q->lock ? q->lock : vdev->lock;
|
|
unsigned res;
|
|
void *fileio;
|
|
|
|
/*
|
|
* If this helper doesn't know how to lock, then you shouldn't be using
|
|
* it but you should write your own.
|
|
*/
|
|
WARN_ON(!lock);
|
|
|
|
if (lock && mutex_lock_interruptible(lock))
|
|
return POLLERR;
|
|
|
|
fileio = q->fileio;
|
|
|
|
res = vb2_poll(vdev->queue, file, wait);
|
|
|
|
/* If fileio was started, then we have a new queue owner. */
|
|
if (!fileio && q->fileio)
|
|
q->owner = file->private_data;
|
|
if (lock)
|
|
mutex_unlock(lock);
|
|
return res;
|
|
}
|
|
EXPORT_SYMBOL_GPL(vb2_fop_poll);
|
|
|
|
#ifndef CONFIG_MMU
|
|
unsigned long vb2_fop_get_unmapped_area(struct file *file, unsigned long addr,
|
|
unsigned long len, unsigned long pgoff, unsigned long flags)
|
|
{
|
|
struct video_device *vdev = video_devdata(file);
|
|
|
|
return vb2_get_unmapped_area(vdev->queue, addr, len, pgoff, flags);
|
|
}
|
|
EXPORT_SYMBOL_GPL(vb2_fop_get_unmapped_area);
|
|
#endif
|
|
|
|
/* vb2_ops helpers. Only use if vq->lock is non-NULL. */
|
|
|
|
void vb2_ops_wait_prepare(struct vb2_queue *vq)
|
|
{
|
|
mutex_unlock(vq->lock);
|
|
}
|
|
EXPORT_SYMBOL_GPL(vb2_ops_wait_prepare);
|
|
|
|
void vb2_ops_wait_finish(struct vb2_queue *vq)
|
|
{
|
|
mutex_lock(vq->lock);
|
|
}
|
|
EXPORT_SYMBOL_GPL(vb2_ops_wait_finish);
|
|
|
|
MODULE_DESCRIPTION("Driver helper framework for Video for Linux 2");
|
|
MODULE_AUTHOR("Pawel Osciak <pawel@osciak.com>, Marek Szyprowski");
|
|
MODULE_LICENSE("GPL");
|