mirror of https://gitee.com/openkylin/linux.git
91 lines
2.7 KiB
C
91 lines
2.7 KiB
C
/*
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au0828-vbi.c - VBI driver for au0828
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Copyright (C) 2010 Devin Heitmueller <dheitmueller@kernellabs.com>
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This work was sponsored by GetWellNetwork Inc.
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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; either version 2 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
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02110-1301, USA.
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*/
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#include "au0828.h"
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include <linux/init.h>
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#include <linux/slab.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 au0828_dev *dev = vb2_get_drv_priv(vq);
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unsigned long size = dev->vbi_width * dev->vbi_height * 2;
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if (*nplanes)
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return sizes[0] < size ? -EINVAL : 0;
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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 au0828_dev *dev = vb2_get_drv_priv(vb->vb2_queue);
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unsigned long size;
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size = dev->vbi_width * dev->vbi_height * 2;
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if (vb2_plane_size(vb, 0) < size) {
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pr_err("%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 au0828_dev *dev = vb2_get_drv_priv(vb->vb2_queue);
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struct vb2_v4l2_buffer *vbuf = to_vb2_v4l2_buffer(vb);
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struct au0828_buffer *buf =
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container_of(vbuf, struct au0828_buffer, vb);
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struct au0828_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 au0828_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 = au0828_start_analog_streaming,
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.stop_streaming = au0828_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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