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1323 lines
36 KiB
1323 lines
36 KiB
/* |
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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 <[email protected]> |
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* Marek Szyprowski <[email protected]> |
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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 <[email protected]> [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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|
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#include <linux/device.h> |
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#include <linux/err.h> |
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#include <linux/freezer.h> |
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#include <linux/kernel.h> |
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#include <linux/kthread.h> |
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#include <linux/mm.h> |
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#include <linux/module.h> |
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#include <linux/poll.h> |
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#include <linux/sched.h> |
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#include <linux/slab.h> |
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|
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#include <media/v4l2-common.h> |
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#include <media/v4l2-dev.h> |
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#include <media/v4l2-device.h> |
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#include <media/v4l2-event.h> |
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#include <media/v4l2-fh.h> |
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|
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#include <media/videobuf2-v4l2.h> |
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|
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static int debug; |
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module_param(debug, int, 0644); |
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|
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#define dprintk(q, level, fmt, arg...) \ |
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do { \ |
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if (debug >= level) \ |
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pr_info("vb2-v4l2: [%p] %s: " fmt, \ |
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(q)->name, __func__, ## arg); \ |
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} while (0) |
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|
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/* Flags that are set by us */ |
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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_IN_REQUEST | \ |
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V4L2_BUF_FLAG_REQUEST_FD | \ |
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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 | \ |
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V4L2_BUF_FLAG_BFRAME | \ |
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V4L2_BUF_FLAG_KEYFRAME | \ |
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V4L2_BUF_FLAG_TIMECODE | \ |
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V4L2_BUF_FLAG_M2M_HOLD_CAPTURE_BUF) |
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|
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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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|
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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(vb->vb2_queue, 1, |
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"multi-planar buffer passed but planes array not provided\n"); |
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return -EINVAL; |
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} |
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|
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if (b->length < vb->num_planes || b->length > VB2_MAX_PLANES) { |
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dprintk(vb->vb2_queue, 1, |
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"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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|
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return 0; |
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} |
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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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/* |
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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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|
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if (V4L2_TYPE_IS_CAPTURE(b->type)) |
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return 0; |
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|
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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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|
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if (b->m.planes[plane].bytesused > length) |
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return -EINVAL; |
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|
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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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|
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if (b->bytesused > length) |
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return -EINVAL; |
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} |
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|
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return 0; |
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} |
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|
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/* |
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* __init_vb2_v4l2_buffer() - initialize the vb2_v4l2_buffer struct |
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*/ |
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static void __init_vb2_v4l2_buffer(struct vb2_buffer *vb) |
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{ |
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struct vb2_v4l2_buffer *vbuf = to_vb2_v4l2_buffer(vb); |
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|
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vbuf->request_fd = -1; |
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} |
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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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|
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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 = v4l2_buffer_get_timestamp(b); |
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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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|
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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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|
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if (check_once) |
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return; |
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|
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check_once = true; |
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|
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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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|
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static int vb2_fill_vb2_v4l2_buffer(struct vb2_buffer *vb, struct v4l2_buffer *b) |
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{ |
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struct vb2_queue *q = vb->vb2_queue; |
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struct vb2_v4l2_buffer *vbuf = to_vb2_v4l2_buffer(vb); |
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struct vb2_plane *planes = vbuf->planes; |
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unsigned int plane; |
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int ret; |
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|
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ret = __verify_length(vb, b); |
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if (ret < 0) { |
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dprintk(q, 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(q, 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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vbuf->sequence = 0; |
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vbuf->request_fd = -1; |
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vbuf->is_held = false; |
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|
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if (V4L2_TYPE_IS_MULTIPLANAR(b->type)) { |
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switch (b->memory) { |
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case 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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break; |
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case 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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break; |
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default: |
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for (plane = 0; plane < vb->num_planes; ++plane) { |
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planes[plane].m.offset = |
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vb->planes[plane].m.offset; |
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planes[plane].length = |
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vb->planes[plane].length; |
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} |
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break; |
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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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|
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if (psrc->bytesused == 0) |
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vb2_warn_zero_bytesused(vb); |
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|
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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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switch (b->memory) { |
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case 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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break; |
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case 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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break; |
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default: |
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planes[0].m.offset = vb->planes[0].m.offset; |
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planes[0].length = vb->planes[0].length; |
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break; |
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} |
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|
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planes[0].data_offset = 0; |
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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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|
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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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} |
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/* Zero flags that we handle */ |
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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_CAPTURE(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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|
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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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if (!(q->subsystem_flags & VB2_V4L2_FL_SUPPORTS_M2M_HOLD_CAPTURE_BUF)) |
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vbuf->flags &= ~V4L2_BUF_FLAG_M2M_HOLD_CAPTURE_BUF; |
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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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/* Zero last flag, this is a signal from driver to userspace */ |
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vbuf->flags &= ~V4L2_BUF_FLAG_LAST; |
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} |
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|
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return 0; |
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} |
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|
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static void set_buffer_cache_hints(struct vb2_queue *q, |
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struct vb2_buffer *vb, |
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struct v4l2_buffer *b) |
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{ |
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/* |
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* DMA exporter should take care of cache syncs, so we can avoid |
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* explicit ->prepare()/->finish() syncs. For other ->memory types |
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* we always need ->prepare() or/and ->finish() cache sync. |
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*/ |
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if (q->memory == VB2_MEMORY_DMABUF) { |
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vb->need_cache_sync_on_finish = 0; |
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vb->need_cache_sync_on_prepare = 0; |
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return; |
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} |
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|
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/* |
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* Cache sync/invalidation flags are set by default in order to |
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* preserve existing behaviour for old apps/drivers. |
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*/ |
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vb->need_cache_sync_on_prepare = 1; |
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vb->need_cache_sync_on_finish = 1; |
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|
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if (!vb2_queue_allows_cache_hints(q)) { |
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/* |
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* Clear buffer cache flags if queue does not support user |
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* space hints. That's to indicate to userspace that these |
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* flags won't work. |
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*/ |
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b->flags &= ~V4L2_BUF_FLAG_NO_CACHE_INVALIDATE; |
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b->flags &= ~V4L2_BUF_FLAG_NO_CACHE_CLEAN; |
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return; |
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} |
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|
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/* |
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* ->finish() cache sync can be avoided when queue direction is |
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* TO_DEVICE. |
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*/ |
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if (q->dma_dir == DMA_TO_DEVICE) |
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vb->need_cache_sync_on_finish = 0; |
|
|
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if (b->flags & V4L2_BUF_FLAG_NO_CACHE_INVALIDATE) |
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vb->need_cache_sync_on_finish = 0; |
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|
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if (b->flags & V4L2_BUF_FLAG_NO_CACHE_CLEAN) |
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vb->need_cache_sync_on_prepare = 0; |
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} |
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|
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static int vb2_queue_or_prepare_buf(struct vb2_queue *q, struct media_device *mdev, |
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struct v4l2_buffer *b, bool is_prepare, |
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struct media_request **p_req) |
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{ |
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const char *opname = is_prepare ? "prepare_buf" : "qbuf"; |
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struct media_request *req; |
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struct vb2_v4l2_buffer *vbuf; |
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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(q, 1, "%s: invalid buffer type\n", opname); |
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return -EINVAL; |
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} |
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|
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if (b->index >= q->num_buffers) { |
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dprintk(q, 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(q, 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(q, 1, "%s: invalid memory type\n", opname); |
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return -EINVAL; |
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} |
|
|
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vb = q->bufs[b->index]; |
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vbuf = to_vb2_v4l2_buffer(vb); |
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ret = __verify_planes_array(vb, b); |
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if (ret) |
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return ret; |
|
|
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if (!is_prepare && (b->flags & V4L2_BUF_FLAG_REQUEST_FD) && |
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vb->state != VB2_BUF_STATE_DEQUEUED) { |
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dprintk(q, 1, "%s: buffer is not in dequeued state\n", opname); |
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return -EINVAL; |
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} |
|
|
|
if (!vb->prepared) { |
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set_buffer_cache_hints(q, vb, b); |
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/* Copy relevant information provided by the userspace */ |
|
memset(vbuf->planes, 0, |
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sizeof(vbuf->planes[0]) * vb->num_planes); |
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ret = vb2_fill_vb2_v4l2_buffer(vb, b); |
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if (ret) |
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return ret; |
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} |
|
|
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if (is_prepare) |
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return 0; |
|
|
|
if (!(b->flags & V4L2_BUF_FLAG_REQUEST_FD)) { |
|
if (q->requires_requests) { |
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dprintk(q, 1, "%s: queue requires requests\n", opname); |
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return -EBADR; |
|
} |
|
if (q->uses_requests) { |
|
dprintk(q, 1, "%s: queue uses requests\n", opname); |
|
return -EBUSY; |
|
} |
|
return 0; |
|
} else if (!q->supports_requests) { |
|
dprintk(q, 1, "%s: queue does not support requests\n", opname); |
|
return -EBADR; |
|
} else if (q->uses_qbuf) { |
|
dprintk(q, 1, "%s: queue does not use requests\n", opname); |
|
return -EBUSY; |
|
} |
|
|
|
/* |
|
* For proper locking when queueing a request you need to be able |
|
* to lock access to the vb2 queue, so check that there is a lock |
|
* that we can use. In addition p_req must be non-NULL. |
|
*/ |
|
if (WARN_ON(!q->lock || !p_req)) |
|
return -EINVAL; |
|
|
|
/* |
|
* Make sure this op is implemented by the driver. It's easy to forget |
|
* this callback, but is it important when canceling a buffer in a |
|
* queued request. |
|
*/ |
|
if (WARN_ON(!q->ops->buf_request_complete)) |
|
return -EINVAL; |
|
/* |
|
* Make sure this op is implemented by the driver for the output queue. |
|
* It's easy to forget this callback, but is it important to correctly |
|
* validate the 'field' value at QBUF time. |
|
*/ |
|
if (WARN_ON((q->type == V4L2_BUF_TYPE_VIDEO_OUTPUT || |
|
q->type == V4L2_BUF_TYPE_VIDEO_OUTPUT_MPLANE) && |
|
!q->ops->buf_out_validate)) |
|
return -EINVAL; |
|
|
|
req = media_request_get_by_fd(mdev, b->request_fd); |
|
if (IS_ERR(req)) { |
|
dprintk(q, 1, "%s: invalid request_fd\n", opname); |
|
return PTR_ERR(req); |
|
} |
|
|
|
/* |
|
* Early sanity check. This is checked again when the buffer |
|
* is bound to the request in vb2_core_qbuf(). |
|
*/ |
|
if (req->state != MEDIA_REQUEST_STATE_IDLE && |
|
req->state != MEDIA_REQUEST_STATE_UPDATING) { |
|
dprintk(q, 1, "%s: request is not idle\n", opname); |
|
media_request_put(req); |
|
return -EBUSY; |
|
} |
|
|
|
*p_req = req; |
|
vbuf->request_fd = b->request_fd; |
|
|
|
return 0; |
|
} |
|
|
|
/* |
|
* __fill_v4l2_buffer() - fill in a struct v4l2_buffer with information to be |
|
* returned to userspace |
|
*/ |
|
static void __fill_v4l2_buffer(struct vb2_buffer *vb, void *pb) |
|
{ |
|
struct v4l2_buffer *b = pb; |
|
struct vb2_v4l2_buffer *vbuf = to_vb2_v4l2_buffer(vb); |
|
struct vb2_queue *q = vb->vb2_queue; |
|
unsigned int plane; |
|
|
|
/* Copy back data such as timestamp, flags, etc. */ |
|
b->index = vb->index; |
|
b->type = vb->type; |
|
b->memory = vb->memory; |
|
b->bytesused = 0; |
|
|
|
b->flags = vbuf->flags; |
|
b->field = vbuf->field; |
|
v4l2_buffer_set_timestamp(b, vb->timestamp); |
|
b->timecode = vbuf->timecode; |
|
b->sequence = vbuf->sequence; |
|
b->reserved2 = 0; |
|
b->request_fd = 0; |
|
|
|
if (q->is_multiplanar) { |
|
/* |
|
* Fill in plane-related data if userspace provided an array |
|
* for it. The caller has already verified memory and size. |
|
*/ |
|
b->length = vb->num_planes; |
|
for (plane = 0; plane < vb->num_planes; ++plane) { |
|
struct v4l2_plane *pdst = &b->m.planes[plane]; |
|
struct vb2_plane *psrc = &vb->planes[plane]; |
|
|
|
pdst->bytesused = psrc->bytesused; |
|
pdst->length = psrc->length; |
|
if (q->memory == VB2_MEMORY_MMAP) |
|
pdst->m.mem_offset = psrc->m.offset; |
|
else if (q->memory == VB2_MEMORY_USERPTR) |
|
pdst->m.userptr = psrc->m.userptr; |
|
else if (q->memory == VB2_MEMORY_DMABUF) |
|
pdst->m.fd = psrc->m.fd; |
|
pdst->data_offset = psrc->data_offset; |
|
memset(pdst->reserved, 0, sizeof(pdst->reserved)); |
|
} |
|
} else { |
|
/* |
|
* We use length and offset in v4l2_planes array even for |
|
* single-planar buffers, but userspace does not. |
|
*/ |
|
b->length = vb->planes[0].length; |
|
b->bytesused = vb->planes[0].bytesused; |
|
if (q->memory == VB2_MEMORY_MMAP) |
|
b->m.offset = vb->planes[0].m.offset; |
|
else if (q->memory == VB2_MEMORY_USERPTR) |
|
b->m.userptr = vb->planes[0].m.userptr; |
|
else if (q->memory == VB2_MEMORY_DMABUF) |
|
b->m.fd = vb->planes[0].m.fd; |
|
} |
|
|
|
/* |
|
* Clear any buffer state related flags. |
|
*/ |
|
b->flags &= ~V4L2_BUFFER_MASK_FLAGS; |
|
b->flags |= q->timestamp_flags & V4L2_BUF_FLAG_TIMESTAMP_MASK; |
|
if (!q->copy_timestamp) { |
|
/* |
|
* For non-COPY timestamps, drop timestamp source bits |
|
* and obtain the timestamp source from the queue. |
|
*/ |
|
b->flags &= ~V4L2_BUF_FLAG_TSTAMP_SRC_MASK; |
|
b->flags |= q->timestamp_flags & V4L2_BUF_FLAG_TSTAMP_SRC_MASK; |
|
} |
|
|
|
switch (vb->state) { |
|
case VB2_BUF_STATE_QUEUED: |
|
case VB2_BUF_STATE_ACTIVE: |
|
b->flags |= V4L2_BUF_FLAG_QUEUED; |
|
break; |
|
case VB2_BUF_STATE_IN_REQUEST: |
|
b->flags |= V4L2_BUF_FLAG_IN_REQUEST; |
|
break; |
|
case VB2_BUF_STATE_ERROR: |
|
b->flags |= V4L2_BUF_FLAG_ERROR; |
|
fallthrough; |
|
case VB2_BUF_STATE_DONE: |
|
b->flags |= V4L2_BUF_FLAG_DONE; |
|
break; |
|
case VB2_BUF_STATE_PREPARING: |
|
case VB2_BUF_STATE_DEQUEUED: |
|
/* nothing */ |
|
break; |
|
} |
|
|
|
if ((vb->state == VB2_BUF_STATE_DEQUEUED || |
|
vb->state == VB2_BUF_STATE_IN_REQUEST) && |
|
vb->synced && vb->prepared) |
|
b->flags |= V4L2_BUF_FLAG_PREPARED; |
|
|
|
if (vb2_buffer_in_use(q, vb)) |
|
b->flags |= V4L2_BUF_FLAG_MAPPED; |
|
if (vbuf->request_fd >= 0) { |
|
b->flags |= V4L2_BUF_FLAG_REQUEST_FD; |
|
b->request_fd = vbuf->request_fd; |
|
} |
|
} |
|
|
|
/* |
|
* __fill_vb2_buffer() - fill a vb2_buffer with information provided in a |
|
* v4l2_buffer by the userspace. It also verifies that struct |
|
* v4l2_buffer has a valid number of planes. |
|
*/ |
|
static int __fill_vb2_buffer(struct vb2_buffer *vb, struct vb2_plane *planes) |
|
{ |
|
struct vb2_v4l2_buffer *vbuf = to_vb2_v4l2_buffer(vb); |
|
unsigned int plane; |
|
|
|
if (!vb->vb2_queue->copy_timestamp) |
|
vb->timestamp = 0; |
|
|
|
for (plane = 0; plane < vb->num_planes; ++plane) { |
|
if (vb->vb2_queue->memory != VB2_MEMORY_MMAP) { |
|
planes[plane].m = vbuf->planes[plane].m; |
|
planes[plane].length = vbuf->planes[plane].length; |
|
} |
|
planes[plane].bytesused = vbuf->planes[plane].bytesused; |
|
planes[plane].data_offset = vbuf->planes[plane].data_offset; |
|
} |
|
return 0; |
|
} |
|
|
|
static const struct vb2_buf_ops v4l2_buf_ops = { |
|
.verify_planes_array = __verify_planes_array_core, |
|
.init_buffer = __init_vb2_v4l2_buffer, |
|
.fill_user_buffer = __fill_v4l2_buffer, |
|
.fill_vb2_buffer = __fill_vb2_buffer, |
|
.copy_timestamp = __copy_timestamp, |
|
}; |
|
|
|
int vb2_find_timestamp(const struct vb2_queue *q, u64 timestamp, |
|
unsigned int start_idx) |
|
{ |
|
unsigned int i; |
|
|
|
for (i = start_idx; i < q->num_buffers; i++) |
|
if (q->bufs[i]->copied_timestamp && |
|
q->bufs[i]->timestamp == timestamp) |
|
return i; |
|
return -1; |
|
} |
|
EXPORT_SYMBOL_GPL(vb2_find_timestamp); |
|
|
|
/* |
|
* vb2_querybuf() - query video buffer information |
|
* @q: videobuf queue |
|
* @b: buffer struct passed from userspace to vidioc_querybuf handler |
|
* in driver |
|
* |
|
* Should be called from vidioc_querybuf ioctl handler in driver. |
|
* This function will verify the passed v4l2_buffer structure and fill the |
|
* relevant information for the userspace. |
|
* |
|
* The return values from this function are intended to be directly returned |
|
* from vidioc_querybuf handler in driver. |
|
*/ |
|
int vb2_querybuf(struct vb2_queue *q, struct v4l2_buffer *b) |
|
{ |
|
struct vb2_buffer *vb; |
|
int ret; |
|
|
|
if (b->type != q->type) { |
|
dprintk(q, 1, "wrong buffer type\n"); |
|
return -EINVAL; |
|
} |
|
|
|
if (b->index >= q->num_buffers) { |
|
dprintk(q, 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); |
|
|
|
static void fill_buf_caps(struct vb2_queue *q, u32 *caps) |
|
{ |
|
*caps = V4L2_BUF_CAP_SUPPORTS_ORPHANED_BUFS; |
|
if (q->io_modes & VB2_MMAP) |
|
*caps |= V4L2_BUF_CAP_SUPPORTS_MMAP; |
|
if (q->io_modes & VB2_USERPTR) |
|
*caps |= V4L2_BUF_CAP_SUPPORTS_USERPTR; |
|
if (q->io_modes & VB2_DMABUF) |
|
*caps |= V4L2_BUF_CAP_SUPPORTS_DMABUF; |
|
if (q->subsystem_flags & VB2_V4L2_FL_SUPPORTS_M2M_HOLD_CAPTURE_BUF) |
|
*caps |= V4L2_BUF_CAP_SUPPORTS_M2M_HOLD_CAPTURE_BUF; |
|
if (q->allow_cache_hints && q->io_modes & VB2_MMAP) |
|
*caps |= V4L2_BUF_CAP_SUPPORTS_MMAP_CACHE_HINTS; |
|
#ifdef CONFIG_MEDIA_CONTROLLER_REQUEST_API |
|
if (q->supports_requests) |
|
*caps |= V4L2_BUF_CAP_SUPPORTS_REQUESTS; |
|
#endif |
|
} |
|
|
|
int vb2_reqbufs(struct vb2_queue *q, struct v4l2_requestbuffers *req) |
|
{ |
|
int ret = vb2_verify_memory_type(q, req->memory, req->type); |
|
|
|
fill_buf_caps(q, &req->capabilities); |
|
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 media_device *mdev, |
|
struct v4l2_buffer *b) |
|
{ |
|
int ret; |
|
|
|
if (vb2_fileio_is_active(q)) { |
|
dprintk(q, 1, "file io in progress\n"); |
|
return -EBUSY; |
|
} |
|
|
|
if (b->flags & V4L2_BUF_FLAG_REQUEST_FD) |
|
return -EINVAL; |
|
|
|
ret = vb2_queue_or_prepare_buf(q, mdev, b, true, NULL); |
|
|
|
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; |
|
|
|
fill_buf_caps(q, &create->capabilities); |
|
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: |
|
case V4L2_BUF_TYPE_META_OUTPUT: |
|
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 media_device *mdev, |
|
struct v4l2_buffer *b) |
|
{ |
|
struct media_request *req = NULL; |
|
int ret; |
|
|
|
if (vb2_fileio_is_active(q)) { |
|
dprintk(q, 1, "file io in progress\n"); |
|
return -EBUSY; |
|
} |
|
|
|
ret = vb2_queue_or_prepare_buf(q, mdev, b, false, &req); |
|
if (ret) |
|
return ret; |
|
ret = vb2_core_qbuf(q, b->index, b, req); |
|
if (req) |
|
media_request_put(req); |
|
return ret; |
|
} |
|
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(q, 1, "file io in progress\n"); |
|
return -EBUSY; |
|
} |
|
|
|
if (b->type != q->type) { |
|
dprintk(q, 1, "invalid buffer type\n"); |
|
return -EINVAL; |
|
} |
|
|
|
ret = vb2_core_dqbuf(q, NULL, b, nonblocking); |
|
|
|
if (!q->is_output && |
|
b->flags & V4L2_BUF_FLAG_DONE && |
|
b->flags & V4L2_BUF_FLAG_LAST) |
|
q->last_buffer_dequeued = true; |
|
|
|
/* |
|
* 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(q, 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(q, 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_name(struct vb2_queue *q, const char *name) |
|
{ |
|
/* |
|
* 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 EPOLLERR 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; |
|
|
|
if (name) |
|
strscpy(q->name, name, sizeof(q->name)); |
|
else |
|
q->name[0] = '\0'; |
|
|
|
return vb2_core_queue_init(q); |
|
} |
|
EXPORT_SYMBOL_GPL(vb2_queue_init_name); |
|
|
|
int vb2_queue_init(struct vb2_queue *q) |
|
{ |
|
return vb2_queue_init_name(q, NULL); |
|
} |
|
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); |
|
|
|
__poll_t vb2_poll(struct vb2_queue *q, struct file *file, poll_table *wait) |
|
{ |
|
struct video_device *vfd = video_devdata(file); |
|
__poll_t res; |
|
|
|
res = vb2_core_poll(q, file, wait); |
|
|
|
if (test_bit(V4L2_FL_USES_V4L2_FH, &vfd->flags)) { |
|
struct v4l2_fh *fh = file->private_data; |
|
|
|
poll_wait(file, &fh->wait, wait); |
|
if (v4l2_event_pending(fh)) |
|
res |= EPOLLPRI; |
|
} |
|
|
|
return res; |
|
} |
|
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); |
|
|
|
fill_buf_caps(vdev->queue, &p->capabilities); |
|
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; |
|
fill_buf_caps(vdev->queue, &p->capabilities); |
|
/* |
|
* 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, vdev->v4l2_dev->mdev, 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, vdev->v4l2_dev->mdev, 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); |
|
|
|
__poll_t 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; |
|
__poll_t 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 EPOLLERR; |
|
|
|
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 |
|
|
|
void vb2_video_unregister_device(struct video_device *vdev) |
|
{ |
|
/* Check if vdev was ever registered at all */ |
|
if (!vdev || !video_is_registered(vdev)) |
|
return; |
|
|
|
/* |
|
* Calling this function only makes sense if vdev->queue is set. |
|
* If it is NULL, then just call video_unregister_device() instead. |
|
*/ |
|
WARN_ON(!vdev->queue); |
|
|
|
/* |
|
* Take a reference to the device since video_unregister_device() |
|
* calls device_unregister(), but we don't want that to release |
|
* the device since we want to clean up the queue first. |
|
*/ |
|
get_device(&vdev->dev); |
|
video_unregister_device(vdev); |
|
if (vdev->queue && vdev->queue->owner) { |
|
struct mutex *lock = vdev->queue->lock ? |
|
vdev->queue->lock : vdev->lock; |
|
|
|
if (lock) |
|
mutex_lock(lock); |
|
vb2_queue_release(vdev->queue); |
|
vdev->queue->owner = NULL; |
|
if (lock) |
|
mutex_unlock(lock); |
|
} |
|
/* |
|
* Now we put the device, and in most cases this will release |
|
* everything. |
|
*/ |
|
put_device(&vdev->dev); |
|
} |
|
EXPORT_SYMBOL_GPL(vb2_video_unregister_device); |
|
|
|
/* 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); |
|
|
|
/* |
|
* Note that this function is called during validation time and |
|
* thus the req_queue_mutex is held to ensure no request objects |
|
* can be added or deleted while validating. So there is no need |
|
* to protect the objects list. |
|
*/ |
|
int vb2_request_validate(struct media_request *req) |
|
{ |
|
struct media_request_object *obj; |
|
int ret = 0; |
|
|
|
if (!vb2_request_buffer_cnt(req)) |
|
return -ENOENT; |
|
|
|
list_for_each_entry(obj, &req->objects, list) { |
|
if (!obj->ops->prepare) |
|
continue; |
|
|
|
ret = obj->ops->prepare(obj); |
|
if (ret) |
|
break; |
|
} |
|
|
|
if (ret) { |
|
list_for_each_entry_continue_reverse(obj, &req->objects, list) |
|
if (obj->ops->unprepare) |
|
obj->ops->unprepare(obj); |
|
return ret; |
|
} |
|
return 0; |
|
} |
|
EXPORT_SYMBOL_GPL(vb2_request_validate); |
|
|
|
void vb2_request_queue(struct media_request *req) |
|
{ |
|
struct media_request_object *obj, *obj_safe; |
|
|
|
/* |
|
* Queue all objects. Note that buffer objects are at the end of the |
|
* objects list, after all other object types. Once buffer objects |
|
* are queued, the driver might delete them immediately (if the driver |
|
* processes the buffer at once), so we have to use |
|
* list_for_each_entry_safe() to handle the case where the object we |
|
* queue is deleted. |
|
*/ |
|
list_for_each_entry_safe(obj, obj_safe, &req->objects, list) |
|
if (obj->ops->queue) |
|
obj->ops->queue(obj); |
|
} |
|
EXPORT_SYMBOL_GPL(vb2_request_queue); |
|
|
|
MODULE_DESCRIPTION("Driver helper framework for Video for Linux 2"); |
|
MODULE_AUTHOR("Pawel Osciak <[email protected]>, Marek Szyprowski"); |
|
MODULE_LICENSE("GPL");
|
|
|