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>
31 static unsigned int vbibufs = 5;
32 module_param(vbibufs, int, 0644);
33 MODULE_PARM_DESC(vbibufs, "number of vbi buffers, range 2-32");
35 static unsigned int vbi_debug;
36 module_param(vbi_debug, int, 0644);
37 MODULE_PARM_DESC(vbi_debug, "enable debug messages [vbi]");
39 #define dprintk(level, fmt, arg...) if (vbi_debug >= level) \
40 printk(KERN_DEBUG "%s: " fmt, dev->core->name , ## arg)
42 /* ------------------------------------------------------------------ */
44 static int vbi_queue_setup(struct vb2_queue *vq, const struct v4l2_format *fmt,
45 unsigned int *nbuffers, unsigned int *nplanes,
46 unsigned int sizes[], void *alloc_ctxs[])
48 struct em28xx *dev = vb2_get_drv_priv(vq);
52 size = fmt->fmt.pix.sizeimage;
54 size = dev->vbi_width * dev->vbi_height * 2;
69 static int vbi_buffer_prepare(struct vb2_buffer *vb)
71 struct em28xx *dev = vb2_get_drv_priv(vb->vb2_queue);
72 struct em28xx_buffer *buf = container_of(vb, struct em28xx_buffer, vb);
75 size = dev->vbi_width * dev->vbi_height * 2;
77 if (vb2_plane_size(vb, 0) < size) {
78 printk(KERN_INFO "%s data will not fit into plane (%lu < %lu)\n",
79 __func__, vb2_plane_size(vb, 0), size);
82 vb2_set_plane_payload(&buf->vb, 0, size);
88 vbi_buffer_queue(struct vb2_buffer *vb)
90 struct em28xx *dev = vb2_get_drv_priv(vb->vb2_queue);
91 struct em28xx_buffer *buf = container_of(vb, struct em28xx_buffer, vb);
92 struct em28xx_dmaqueue *vbiq = &dev->vbiq;
93 unsigned long flags = 0;
95 buf->mem = vb2_plane_vaddr(vb, 0);
96 buf->length = vb2_plane_size(vb, 0);
98 spin_lock_irqsave(&dev->slock, flags);
99 list_add_tail(&buf->list, &vbiq->active);
100 spin_unlock_irqrestore(&dev->slock, flags);
104 struct vb2_ops em28xx_vbi_qops = {
105 .queue_setup = vbi_queue_setup,
106 .buf_prepare = vbi_buffer_prepare,
107 .buf_queue = vbi_buffer_queue,
108 .start_streaming = em28xx_start_analog_streaming,
109 .stop_streaming = em28xx_stop_vbi_streaming,
110 .wait_prepare = vb2_ops_wait_prepare,
111 .wait_finish = vb2_ops_wait_finish,