cachepc-linux

Fork of AMDESE/linux with modifications for CachePC side-channel attack
git clone https://git.sinitax.com/sinitax/cachepc-linux
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au0828-vbi.c (2042B)


      1// SPDX-License-Identifier: GPL-2.0-or-later
      2/*
      3   au0828-vbi.c - VBI driver for au0828
      4
      5   Copyright (C) 2010 Devin Heitmueller <dheitmueller@kernellabs.com>
      6
      7   This work was sponsored by GetWellNetwork Inc.
      8
      9 */
     10
     11#include "au0828.h"
     12
     13#include <linux/kernel.h>
     14#include <linux/module.h>
     15#include <linux/init.h>
     16#include <linux/slab.h>
     17
     18/* ------------------------------------------------------------------ */
     19
     20static int vbi_queue_setup(struct vb2_queue *vq,
     21			   unsigned int *nbuffers, unsigned int *nplanes,
     22			   unsigned int sizes[], struct device *alloc_devs[])
     23{
     24	struct au0828_dev *dev = vb2_get_drv_priv(vq);
     25	unsigned long size = dev->vbi_width * dev->vbi_height * 2;
     26
     27	if (*nplanes)
     28		return sizes[0] < size ? -EINVAL : 0;
     29	*nplanes = 1;
     30	sizes[0] = size;
     31	return 0;
     32}
     33
     34static int vbi_buffer_prepare(struct vb2_buffer *vb)
     35{
     36	struct au0828_dev *dev = vb2_get_drv_priv(vb->vb2_queue);
     37	unsigned long size;
     38
     39	size = dev->vbi_width * dev->vbi_height * 2;
     40
     41	if (vb2_plane_size(vb, 0) < size) {
     42		pr_err("%s data will not fit into plane (%lu < %lu)\n",
     43			__func__, vb2_plane_size(vb, 0), size);
     44		return -EINVAL;
     45	}
     46	vb2_set_plane_payload(vb, 0, size);
     47
     48	return 0;
     49}
     50
     51static void
     52vbi_buffer_queue(struct vb2_buffer *vb)
     53{
     54	struct au0828_dev *dev = vb2_get_drv_priv(vb->vb2_queue);
     55	struct vb2_v4l2_buffer *vbuf = to_vb2_v4l2_buffer(vb);
     56	struct au0828_buffer *buf =
     57			container_of(vbuf, struct au0828_buffer, vb);
     58	struct au0828_dmaqueue *vbiq = &dev->vbiq;
     59	unsigned long flags = 0;
     60
     61	buf->mem = vb2_plane_vaddr(vb, 0);
     62	buf->length = vb2_plane_size(vb, 0);
     63
     64	spin_lock_irqsave(&dev->slock, flags);
     65	list_add_tail(&buf->list, &vbiq->active);
     66	spin_unlock_irqrestore(&dev->slock, flags);
     67}
     68
     69const struct vb2_ops au0828_vbi_qops = {
     70	.queue_setup     = vbi_queue_setup,
     71	.buf_prepare     = vbi_buffer_prepare,
     72	.buf_queue       = vbi_buffer_queue,
     73	.start_streaming = au0828_start_analog_streaming,
     74	.stop_streaming  = au0828_stop_vbi_streaming,
     75	.wait_prepare    = vb2_ops_wait_prepare,
     76	.wait_finish     = vb2_ops_wait_finish,
     77};