90 lines
2.2 KiB
C
90 lines
2.2 KiB
C
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// SPDX-License-Identifier: GPL-2.0+
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//
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// em28xx-vbi.c - VBI driver for em28xx
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//
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// Copyright (C) 2009 Devin Heitmueller <dheitmueller@kernellabs.com>
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//
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// This work was sponsored by EyeMagnet Limited.
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#include "em28xx.h"
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include <linux/hardirq.h>
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#include <linux/init.h>
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#include <linux/usb.h>
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#include "em28xx-v4l.h"
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/* ------------------------------------------------------------------ */
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static int vbi_queue_setup(struct vb2_queue *vq,
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unsigned int *nbuffers, unsigned int *nplanes,
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unsigned int sizes[], struct device *alloc_devs[])
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{
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struct em28xx *dev = vb2_get_drv_priv(vq);
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struct em28xx_v4l2 *v4l2 = dev->v4l2;
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unsigned long size = v4l2->vbi_width * v4l2->vbi_height * 2;
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if (*nbuffers < 2)
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*nbuffers = 2;
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if (*nplanes) {
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if (sizes[0] < size)
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return -EINVAL;
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size = sizes[0];
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}
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*nplanes = 1;
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sizes[0] = size;
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return 0;
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}
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static int vbi_buffer_prepare(struct vb2_buffer *vb)
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{
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struct em28xx *dev = vb2_get_drv_priv(vb->vb2_queue);
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struct em28xx_v4l2 *v4l2 = dev->v4l2;
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unsigned long size;
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size = v4l2->vbi_width * v4l2->vbi_height * 2;
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if (vb2_plane_size(vb, 0) < size) {
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dev_info(&dev->intf->dev,
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"%s data will not fit into plane (%lu < %lu)\n",
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__func__, vb2_plane_size(vb, 0), size);
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return -EINVAL;
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}
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vb2_set_plane_payload(vb, 0, size);
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return 0;
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}
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static void
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vbi_buffer_queue(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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struct em28xx *dev = vb2_get_drv_priv(vb->vb2_queue);
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struct em28xx_buffer *buf =
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container_of(vbuf, struct em28xx_buffer, vb);
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struct em28xx_dmaqueue *vbiq = &dev->vbiq;
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unsigned long flags = 0;
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buf->mem = vb2_plane_vaddr(vb, 0);
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buf->length = vb2_plane_size(vb, 0);
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spin_lock_irqsave(&dev->slock, flags);
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list_add_tail(&buf->list, &vbiq->active);
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spin_unlock_irqrestore(&dev->slock, flags);
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}
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const struct vb2_ops em28xx_vbi_qops = {
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.queue_setup = vbi_queue_setup,
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.buf_prepare = vbi_buffer_prepare,
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.buf_queue = vbi_buffer_queue,
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.start_streaming = em28xx_start_analog_streaming,
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.stop_streaming = em28xx_stop_vbi_streaming,
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.wait_prepare = vb2_ops_wait_prepare,
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.wait_finish = vb2_ops_wait_finish,
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};
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