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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em28xx-vbi.c (2757B)

      1// SPDX-License-Identifier: GPL-2.0+
      2//
      3// em28xx-vbi.c - VBI driver for em28xx
      4//
      5// Copyright (C) 2009 Devin Heitmueller <dheitmueller@kernellabs.com>
      6//
      7// This work was sponsored by EyeMagnet Limited.
      8//
      9// This program is free software; you can redistribute it and/or modify
     10// it under the terms of the GNU General Public License as published by
     11// the Free Software Foundation; either version 2 of the License, or
     12// (at your option) any later version.
     13//
     14// This program is distributed in the hope that it will be useful,
     15// but WITHOUT ANY WARRANTY; without even the implied warranty of
     16// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
     17// GNU General Public License for more details.
     18
     19#include "em28xx.h"
     20
     21#include <linux/kernel.h>
     22#include <linux/module.h>
     23#include <linux/hardirq.h>
     24#include <linux/init.h>
     25#include <linux/usb.h>
     26
     27#include "em28xx-v4l.h"
     28
     29/* ------------------------------------------------------------------ */
     30
     31static int vbi_queue_setup(struct vb2_queue *vq,
     32			   unsigned int *nbuffers, unsigned int *nplanes,
     33			   unsigned int sizes[], struct device *alloc_devs[])
     34{
     35	struct em28xx *dev = vb2_get_drv_priv(vq);
     36	struct em28xx_v4l2 *v4l2 = dev->v4l2;
     37	unsigned long size = v4l2->vbi_width * v4l2->vbi_height * 2;
     38
     39	if (*nbuffers < 2)
     40		*nbuffers = 2;
     41
     42	if (*nplanes) {
     43		if (sizes[0] < size)
     44			return -EINVAL;
     45		size = sizes[0];
     46	}
     47
     48	*nplanes = 1;
     49	sizes[0] = size;
     50
     51	return 0;
     52}
     53
     54static int vbi_buffer_prepare(struct vb2_buffer *vb)
     55{
     56	struct em28xx        *dev  = vb2_get_drv_priv(vb->vb2_queue);
     57	struct em28xx_v4l2   *v4l2 = dev->v4l2;
     58	unsigned long        size;
     59
     60	size = v4l2->vbi_width * v4l2->vbi_height * 2;
     61
     62	if (vb2_plane_size(vb, 0) < size) {
     63		dev_info(&dev->intf->dev,
     64			 "%s data will not fit into plane (%lu < %lu)\n",
     65			 __func__, vb2_plane_size(vb, 0), size);
     66		return -EINVAL;
     67	}
     68	vb2_set_plane_payload(vb, 0, size);
     69
     70	return 0;
     71}
     72
     73static void
     74vbi_buffer_queue(struct vb2_buffer *vb)
     75{
     76	struct vb2_v4l2_buffer *vbuf = to_vb2_v4l2_buffer(vb);
     77	struct em28xx *dev = vb2_get_drv_priv(vb->vb2_queue);
     78	struct em28xx_buffer *buf =
     79		container_of(vbuf, struct em28xx_buffer, vb);
     80	struct em28xx_dmaqueue *vbiq = &dev->vbiq;
     81	unsigned long flags = 0;
     82
     83	buf->mem = vb2_plane_vaddr(vb, 0);
     84	buf->length = vb2_plane_size(vb, 0);
     85
     86	spin_lock_irqsave(&dev->slock, flags);
     87	list_add_tail(&buf->list, &vbiq->active);
     88	spin_unlock_irqrestore(&dev->slock, flags);
     89}
     90
     91const struct vb2_ops em28xx_vbi_qops = {
     92	.queue_setup    = vbi_queue_setup,
     93	.buf_prepare    = vbi_buffer_prepare,
     94	.buf_queue      = vbi_buffer_queue,
     95	.start_streaming = em28xx_start_analog_streaming,
     96	.stop_streaming = em28xx_stop_vbi_streaming,
     97	.wait_prepare   = vb2_ops_wait_prepare,
     98	.wait_finish    = vb2_ops_wait_finish,
     99};