2 em28xx-vbi.c - VBI driver for em28xx
4 Copyright (C) 2009 Devin Heitmueller <dheitmueller@kernellabs.com>
6 This work was sponsored by EyeMagnet Limited.
8 This program is free software; you can redistribute it and/or modify
9 it under the terms of the GNU General Public License as published by
10 the Free Software Foundation; either version 2 of the License, or
11 (at your option) any later version.
13 This program is distributed in the hope that it will be useful,
14 but WITHOUT ANY WARRANTY; without even the implied warranty of
15 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 GNU General Public License for more details.
18 You should have received a copy of the GNU General Public License
19 along with this program; if not, write to the Free Software
20 Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
24 #include <linux/kernel.h>
25 #include <linux/module.h>
26 #include <linux/hardirq.h>
27 #include <linux/init.h>
30 #include "em28xx-v4l.h"
32 /* ------------------------------------------------------------------ */
34 static int vbi_queue_setup(struct vb2_queue *vq, const struct v4l2_format *fmt,
35 unsigned int *nbuffers, unsigned int *nplanes,
36 unsigned int sizes[], void *alloc_ctxs[])
38 struct em28xx *dev = vb2_get_drv_priv(vq);
39 struct em28xx_v4l2 *v4l2 = dev->v4l2;
43 size = fmt->fmt.pix.sizeimage;
45 size = v4l2->vbi_width * v4l2->vbi_height * 2;
60 static int vbi_buffer_prepare(struct vb2_buffer *vb)
62 struct em28xx *dev = vb2_get_drv_priv(vb->vb2_queue);
63 struct em28xx_v4l2 *v4l2 = dev->v4l2;
64 struct em28xx_buffer *buf = container_of(vb, struct em28xx_buffer, vb);
67 size = v4l2->vbi_width * v4l2->vbi_height * 2;
69 if (vb2_plane_size(vb, 0) < size) {
70 printk(KERN_INFO "%s data will not fit into plane (%lu < %lu)\n",
71 __func__, vb2_plane_size(vb, 0), size);
74 vb2_set_plane_payload(&buf->vb, 0, size);
80 vbi_buffer_queue(struct vb2_buffer *vb)
82 struct em28xx *dev = vb2_get_drv_priv(vb->vb2_queue);
83 struct em28xx_buffer *buf = container_of(vb, struct em28xx_buffer, vb);
84 struct em28xx_dmaqueue *vbiq = &dev->vbiq;
85 unsigned long flags = 0;
87 buf->mem = vb2_plane_vaddr(vb, 0);
88 buf->length = vb2_plane_size(vb, 0);
90 spin_lock_irqsave(&dev->slock, flags);
91 list_add_tail(&buf->list, &vbiq->active);
92 spin_unlock_irqrestore(&dev->slock, flags);
95 struct vb2_ops em28xx_vbi_qops = {
96 .queue_setup = vbi_queue_setup,
97 .buf_prepare = vbi_buffer_prepare,
98 .buf_queue = vbi_buffer_queue,
99 .start_streaming = em28xx_start_analog_streaming,
100 .stop_streaming = em28xx_stop_vbi_streaming,
101 .wait_prepare = vb2_ops_wait_prepare,
102 .wait_finish = vb2_ops_wait_finish,