1// SPDX-License-Identifier: GPL-2.0-only
2/*
3 * vivid-meta-cap.c - meta capture 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-cap.h"
14#include "vivid-meta-cap.h"
15
16static int meta_cap_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_uvc_meta_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_cap_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_uvc_meta_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_cap_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_cap_active);
75	spin_unlock(&dev->slock);
76}
77
78static int meta_cap_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_cap_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_cap(dev,
90						     &dev->meta_cap_streaming);
91	}
92	if (err) {
93		struct vivid_buffer *buf, *tmp;
94
95		list_for_each_entry_safe(buf, tmp,
96					 &dev->meta_cap_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_cap_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_cap(dev, &dev->meta_cap_streaming);
112}
113
114static void meta_cap_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_cap);
119}
120
121const struct vb2_ops vivid_meta_cap_qops = {
122	.queue_setup		= meta_cap_queue_setup,
123	.buf_prepare		= meta_cap_buf_prepare,
124	.buf_queue		= meta_cap_buf_queue,
125	.start_streaming	= meta_cap_start_streaming,
126	.stop_streaming		= meta_cap_stop_streaming,
127	.buf_request_complete	= meta_cap_buf_request_complete,
128	.wait_prepare		= vb2_ops_wait_prepare,
129	.wait_finish		= vb2_ops_wait_finish,
130};
131
132int vidioc_enum_fmt_meta_cap(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_CAPTURE;
144	f->pixelformat = V4L2_META_FMT_UVC;
145	return 0;
146}
147
148int vidioc_g_fmt_meta_cap(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_cap)
155		return -EINVAL;
156
157	meta->dataformat = V4L2_META_FMT_UVC;
158	meta->buffersize = sizeof(struct vivid_uvc_meta_buf);
159	return 0;
160}
161
162void vivid_meta_cap_fillbuff(struct vivid_dev *dev,
163			     struct vivid_buffer *buf, u64 soe)
164{
165	struct vivid_uvc_meta_buf *meta = vb2_plane_vaddr(&buf->vb.vb2_buf, 0);
166	int buf_off = 0;
167
168	buf->vb.sequence = dev->meta_cap_seq_count;
169	if (dev->field_cap == V4L2_FIELD_ALTERNATE)
170		buf->vb.sequence /= 2;
171	memset(meta, 1, vb2_plane_size(&buf->vb.vb2_buf, 0));
172
173	meta->ns = ktime_get_ns();
174	meta->sof = buf->vb.sequence * 30;
175	meta->length = sizeof(*meta) - offsetof(struct vivid_uvc_meta_buf, length);
176	meta->flags = UVC_STREAM_EOH | UVC_STREAM_EOF;
177
178	if ((buf->vb.sequence % 2) == 0)
179		meta->flags |= UVC_STREAM_FID;
180
181	dprintk(dev, 2, "%s ns:%llu sof:%4d len:%u flags: 0x%02x",
182		__func__, meta->ns, meta->sof, meta->length, meta->flags);
183	if (dev->meta_pts) {
184		meta->flags |= UVC_STREAM_PTS;
185		meta->buf[0] = div_u64(soe, VIVID_META_CLOCK_UNIT);
186		buf_off = 4;
187		dprintk(dev, 2, " pts: %u\n", *(__u32 *)(meta->buf));
188	}
189
190	if (dev->meta_scr) {
191		meta->flags |= UVC_STREAM_SCR;
192		meta->buf[buf_off] = div_u64((soe + dev->cap_frame_eof_offset),
193					     VIVID_META_CLOCK_UNIT);
194
195		meta->buf[buf_off + 4] = (buf->vb.sequence * 30) % 1000;
196		dprintk(dev, 2, " stc: %u, sof counter: %u\n",
197			*(__u32 *)(meta->buf + buf_off),
198			*(__u16 *)(meta->buf + buf_off + 4));
199	}
200	dprintk(dev, 2, "\n");
201}
202