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 #include "em28xx.h"
10
11 #include <linux/kernel.h>
12 #include <linux/module.h>
13 #include <linux/hardirq.h>
14 #include <linux/init.h>
15 #include <linux/usb.h>
16
17 #include "em28xx-v4l.h"
18
19 /* ------------------------------------------------------------------ */
20
vbi_queue_setup(struct vb2_queue * vq,unsigned int * nbuffers,unsigned int * nplanes,unsigned int sizes[],struct device * alloc_devs[])21 static int vbi_queue_setup(struct vb2_queue *vq,
22 unsigned int *nbuffers, unsigned int *nplanes,
23 unsigned int sizes[], struct device *alloc_devs[])
24 {
25 struct em28xx *dev = vb2_get_drv_priv(vq);
26 struct em28xx_v4l2 *v4l2 = dev->v4l2;
27 unsigned long size = v4l2->vbi_width * v4l2->vbi_height * 2;
28
29 if (*nbuffers < 2)
30 *nbuffers = 2;
31
32 if (*nplanes) {
33 if (sizes[0] < size)
34 return -EINVAL;
35 size = sizes[0];
36 }
37
38 *nplanes = 1;
39 sizes[0] = size;
40
41 return 0;
42 }
43
vbi_buffer_prepare(struct vb2_buffer * vb)44 static int vbi_buffer_prepare(struct vb2_buffer *vb)
45 {
46 struct em28xx *dev = vb2_get_drv_priv(vb->vb2_queue);
47 struct em28xx_v4l2 *v4l2 = dev->v4l2;
48 unsigned long size;
49
50 size = v4l2->vbi_width * v4l2->vbi_height * 2;
51
52 if (vb2_plane_size(vb, 0) < size) {
53 dev_info(&dev->intf->dev,
54 "%s data will not fit into plane (%lu < %lu)\n",
55 __func__, vb2_plane_size(vb, 0), size);
56 return -EINVAL;
57 }
58 vb2_set_plane_payload(vb, 0, size);
59
60 return 0;
61 }
62
63 static void
vbi_buffer_queue(struct vb2_buffer * vb)64 vbi_buffer_queue(struct vb2_buffer *vb)
65 {
66 struct vb2_v4l2_buffer *vbuf = to_vb2_v4l2_buffer(vb);
67 struct em28xx *dev = vb2_get_drv_priv(vb->vb2_queue);
68 struct em28xx_buffer *buf =
69 container_of(vbuf, struct em28xx_buffer, vb);
70 struct em28xx_dmaqueue *vbiq = &dev->vbiq;
71 unsigned long flags = 0;
72
73 buf->mem = vb2_plane_vaddr(vb, 0);
74 buf->length = vb2_plane_size(vb, 0);
75
76 spin_lock_irqsave(&dev->slock, flags);
77 list_add_tail(&buf->list, &vbiq->active);
78 spin_unlock_irqrestore(&dev->slock, flags);
79 }
80
81 const struct vb2_ops em28xx_vbi_qops = {
82 .queue_setup = vbi_queue_setup,
83 .buf_prepare = vbi_buffer_prepare,
84 .buf_queue = vbi_buffer_queue,
85 .start_streaming = em28xx_start_analog_streaming,
86 .stop_streaming = em28xx_stop_vbi_streaming,
87 .wait_prepare = vb2_ops_wait_prepare,
88 .wait_finish = vb2_ops_wait_finish,
89 };
90