usb/au0828/au0828-vbi.c

0001 // SPDX-License-Identifier: GPL-2.0-or-later
0002 /*
0003    au0828-vbi.c - VBI driver for au0828
0004
0005    Copyright (C) 2010 Devin Heitmueller <dheitmueller@kernellabs.com>
0006
0007    This work was sponsored by GetWellNetwork Inc.
0008
0009  */
0010
0011 #include "au0828.h"
0012
0013 #include <linux/kernel.h>
0014 #include <linux/module.h>
0015 #include <linux/init.h>
0016 #include <linux/slab.h>
0017
0018 /* ------------------------------------------------------------------ */
0019
0020 static int vbi_queue_setup(struct vb2_queue *vq,
0021                unsigned int *nbuffers, unsigned int *nplanes,
0022                unsigned int sizes[], struct device *alloc_devs[])
0023 {
0024     struct au0828_dev *dev = vb2_get_drv_priv(vq);
0025     unsigned long size = dev->vbi_width * dev->vbi_height * 2;
0026
0027     if (*nplanes)
0028         return sizes[0] < size ? -EINVAL : 0;
0029     *nplanes = 1;
0030     sizes[0] = size;
0031     return 0;
0032 }
0033
0034 static int vbi_buffer_prepare(struct vb2_buffer *vb)
0035 {
0036     struct au0828_dev *dev = vb2_get_drv_priv(vb->vb2_queue);
0037     unsigned long size;
0038
0039     size = dev->vbi_width * dev->vbi_height * 2;
0040
0041     if (vb2_plane_size(vb, 0) < size) {
0042         pr_err("%s data will not fit into plane (%lu < %lu)\n",
0043             __func__, vb2_plane_size(vb, 0), size);
0044         return -EINVAL;
0045     }
0046     vb2_set_plane_payload(vb, 0, size);
0047
0048     return 0;
0049 }
0050
0051 static void
0052 vbi_buffer_queue(struct vb2_buffer *vb)
0053 {
0054     struct au0828_dev *dev = vb2_get_drv_priv(vb->vb2_queue);
0055     struct vb2_v4l2_buffer *vbuf = to_vb2_v4l2_buffer(vb);
0056     struct au0828_buffer *buf =
0057             container_of(vbuf, struct au0828_buffer, vb);
0058     struct au0828_dmaqueue *vbiq = &dev->vbiq;
0059     unsigned long flags = 0;
0060
0061     buf->mem = vb2_plane_vaddr(vb, 0);
0062     buf->length = vb2_plane_size(vb, 0);
0063
0064     spin_lock_irqsave(&dev->slock, flags);
0065     list_add_tail(&buf->list, &vbiq->active);
0066     spin_unlock_irqrestore(&dev->slock, flags);
0067 }
0068
0069 const struct vb2_ops au0828_vbi_qops = {
0070     .queue_setup     = vbi_queue_setup,
0071     .buf_prepare     = vbi_buffer_prepare,
0072     .buf_queue       = vbi_buffer_queue,
0073     .start_streaming = au0828_start_analog_streaming,
0074     .stop_streaming  = au0828_stop_vbi_streaming,
0075     .wait_prepare    = vb2_ops_wait_prepare,
0076     .wait_finish     = vb2_ops_wait_finish,
0077 };