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 
16 static 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 
40 static 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 
65 static 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 
78 static 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 */
106 static 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 
114 static 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 
121 const 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 
132 int 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 
148 int 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 
162 void 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