1// SPDX-License-Identifier: GPL-2.0-only
2/*
3 * vivid-meta-out.c - meta output support functions.
4 */
5
6#include <linux/errno.h>
7#include <linux/kernel.h>
8#include <linux/videodev2.h>
9#include <media/v4l2-common.h>
10#include <linux/usb/video.h>
11
12#include "vivid-core.h"
13#include "vivid-kthread-out.h"
14#include "vivid-meta-out.h"
15
16static int meta_out_queue_setup(struct vb2_queue *vq, unsigned int *nbuffers,
17				unsigned int *nplanes, unsigned int sizes[],
18				struct device *alloc_devs[])
19{
20	struct vivid_dev *dev = vb2_get_drv_priv(vq);
21	unsigned int size =  sizeof(struct vivid_meta_out_buf);
22
23	if (!vivid_is_webcam(dev))
24		return -EINVAL;
25
26	if (*nplanes) {
27		if (sizes[0] < size)
28			return -EINVAL;
29	} else {
30		sizes[0] = size;
31	}
32
33	if (vq->num_buffers + *nbuffers < 2)
34		*nbuffers = 2 - vq->num_buffers;
35
36	*nplanes = 1;
37	return 0;
38}
39
40static int meta_out_buf_prepare(struct vb2_buffer *vb)
41{
42	struct vivid_dev *dev = vb2_get_drv_priv(vb->vb2_queue);
43	unsigned int size = sizeof(struct vivid_meta_out_buf);
44
45	dprintk(dev, 1, "%s\n", __func__);
46
47	if (dev->buf_prepare_error) {
48		/*
49		 * Error injection: test what happens if buf_prepare() returns
50		 * an error.
51		 */
52		dev->buf_prepare_error = false;
53		return -EINVAL;
54	}
55	if (vb2_plane_size(vb, 0) < size) {
56		dprintk(dev, 1, "%s data will not fit into plane (%lu < %u)\n",
57			__func__, vb2_plane_size(vb, 0), size);
58		return -EINVAL;
59	}
60	vb2_set_plane_payload(vb, 0, size);
61
62	return 0;
63}
64
65static void meta_out_buf_queue(struct vb2_buffer *vb)
66{
67	struct vb2_v4l2_buffer *vbuf = to_vb2_v4l2_buffer(vb);
68	struct vivid_dev *dev = vb2_get_drv_priv(vb->vb2_queue);
69	struct vivid_buffer *buf = container_of(vbuf, struct vivid_buffer, vb);
70
71	dprintk(dev, 1, "%s\n", __func__);
72
73	spin_lock(&dev->slock);
74	list_add_tail(&buf->list, &dev->meta_out_active);
75	spin_unlock(&dev->slock);
76}
77
78static int meta_out_start_streaming(struct vb2_queue *vq, unsigned int count)
79{
80	struct vivid_dev *dev = vb2_get_drv_priv(vq);
81	int err;
82
83	dprintk(dev, 1, "%s\n", __func__);
84	dev->meta_out_seq_count = 0;
85	if (dev->start_streaming_error) {
86		dev->start_streaming_error = false;
87		err = -EINVAL;
88	} else {
89		err = vivid_start_generating_vid_out(dev,
90						     &dev->meta_out_streaming);
91	}
92	if (err) {
93		struct vivid_buffer *buf, *tmp;
94
95		list_for_each_entry_safe(buf, tmp,
96					 &dev->meta_out_active, list) {
97			list_del(&buf->list);
98			vb2_buffer_done(&buf->vb.vb2_buf,
99					VB2_BUF_STATE_QUEUED);
100		}
101	}
102	return err;
103}
104
105/* abort streaming and wait for last buffer */
106static void meta_out_stop_streaming(struct vb2_queue *vq)
107{
108	struct vivid_dev *dev = vb2_get_drv_priv(vq);
109
110	dprintk(dev, 1, "%s\n", __func__);
111	vivid_stop_generating_vid_out(dev, &dev->meta_out_streaming);
112}
113
114static void meta_out_buf_request_complete(struct vb2_buffer *vb)
115{
116	struct vivid_dev *dev = vb2_get_drv_priv(vb->vb2_queue);
117
118	v4l2_ctrl_request_complete(vb->req_obj.req, &dev->ctrl_hdl_meta_out);
119}
120
121const struct vb2_ops vivid_meta_out_qops = {
122	.queue_setup            = meta_out_queue_setup,
123	.buf_prepare            = meta_out_buf_prepare,
124	.buf_queue              = meta_out_buf_queue,
125	.start_streaming        = meta_out_start_streaming,
126	.stop_streaming         = meta_out_stop_streaming,
127	.buf_request_complete   = meta_out_buf_request_complete,
128	.wait_prepare           = vb2_ops_wait_prepare,
129	.wait_finish            = vb2_ops_wait_finish,
130};
131
132int vidioc_enum_fmt_meta_out(struct file *file, void  *priv,
133			     struct v4l2_fmtdesc *f)
134{
135	struct vivid_dev *dev = video_drvdata(file);
136
137	if (!vivid_is_webcam(dev))
138		return -EINVAL;
139
140	if (f->index > 0)
141		return -EINVAL;
142
143	f->type = V4L2_BUF_TYPE_META_OUTPUT;
144	f->pixelformat = V4L2_META_FMT_VIVID;
145	return 0;
146}
147
148int vidioc_g_fmt_meta_out(struct file *file, void *priv,
149			  struct v4l2_format *f)
150{
151	struct vivid_dev *dev = video_drvdata(file);
152	struct v4l2_meta_format *meta = &f->fmt.meta;
153
154	if (!vivid_is_webcam(dev) || !dev->has_meta_out)
155		return -EINVAL;
156
157	meta->dataformat = V4L2_META_FMT_VIVID;
158	meta->buffersize = sizeof(struct vivid_meta_out_buf);
159	return 0;
160}
161
162void vivid_meta_out_process(struct vivid_dev *dev,
163			    struct vivid_buffer *buf)
164{
165	struct vivid_meta_out_buf *meta = vb2_plane_vaddr(&buf->vb.vb2_buf, 0);
166
167	v4l2_ctrl_s_ctrl(dev->brightness, meta->brightness);
168	v4l2_ctrl_s_ctrl(dev->contrast, meta->contrast);
169	v4l2_ctrl_s_ctrl(dev->saturation, meta->saturation);
170	v4l2_ctrl_s_ctrl(dev->hue, meta->hue);
171
172	dprintk(dev, 2, " %s brightness %u contrast %u saturation %u hue %d\n",
173		__func__, meta->brightness, meta->contrast,
174		meta->saturation, meta->hue);
175}
176