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 16 static 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 *nplanes = 1; 34 return 0; 35 } 36 37 static int meta_cap_buf_prepare(struct vb2_buffer *vb) 38 { 39 struct vivid_dev *dev = vb2_get_drv_priv(vb->vb2_queue); 40 unsigned int size = sizeof(struct vivid_uvc_meta_buf); 41 42 dprintk(dev, 1, "%s\n", __func__); 43 44 if (dev->buf_prepare_error) { 45 /* 46 * Error injection: test what happens if buf_prepare() returns 47 * an error. 48 */ 49 dev->buf_prepare_error = false; 50 return -EINVAL; 51 } 52 if (vb2_plane_size(vb, 0) < size) { 53 dprintk(dev, 1, "%s data will not fit into plane (%lu < %u)\n", 54 __func__, vb2_plane_size(vb, 0), size); 55 return -EINVAL; 56 } 57 vb2_set_plane_payload(vb, 0, size); 58 59 return 0; 60 } 61 62 static void meta_cap_buf_queue(struct vb2_buffer *vb) 63 { 64 struct vb2_v4l2_buffer *vbuf = to_vb2_v4l2_buffer(vb); 65 struct vivid_dev *dev = vb2_get_drv_priv(vb->vb2_queue); 66 struct vivid_buffer *buf = container_of(vbuf, struct vivid_buffer, vb); 67 68 dprintk(dev, 1, "%s\n", __func__); 69 70 spin_lock(&dev->slock); 71 list_add_tail(&buf->list, &dev->meta_cap_active); 72 spin_unlock(&dev->slock); 73 } 74 75 static int meta_cap_start_streaming(struct vb2_queue *vq, unsigned int count) 76 { 77 struct vivid_dev *dev = vb2_get_drv_priv(vq); 78 int err; 79 80 dprintk(dev, 1, "%s\n", __func__); 81 dev->meta_cap_seq_count = 0; 82 if (dev->start_streaming_error) { 83 dev->start_streaming_error = false; 84 err = -EINVAL; 85 } else { 86 err = vivid_start_generating_vid_cap(dev, 87 &dev->meta_cap_streaming); 88 } 89 if (err) { 90 struct vivid_buffer *buf, *tmp; 91 92 list_for_each_entry_safe(buf, tmp, 93 &dev->meta_cap_active, list) { 94 list_del(&buf->list); 95 vb2_buffer_done(&buf->vb.vb2_buf, 96 VB2_BUF_STATE_QUEUED); 97 } 98 } 99 return err; 100 } 101 102 /* abort streaming and wait for last buffer */ 103 static void meta_cap_stop_streaming(struct vb2_queue *vq) 104 { 105 struct vivid_dev *dev = vb2_get_drv_priv(vq); 106 107 dprintk(dev, 1, "%s\n", __func__); 108 vivid_stop_generating_vid_cap(dev, &dev->meta_cap_streaming); 109 } 110 111 static void meta_cap_buf_request_complete(struct vb2_buffer *vb) 112 { 113 struct vivid_dev *dev = vb2_get_drv_priv(vb->vb2_queue); 114 115 v4l2_ctrl_request_complete(vb->req_obj.req, &dev->ctrl_hdl_meta_cap); 116 } 117 118 const struct vb2_ops vivid_meta_cap_qops = { 119 .queue_setup = meta_cap_queue_setup, 120 .buf_prepare = meta_cap_buf_prepare, 121 .buf_queue = meta_cap_buf_queue, 122 .start_streaming = meta_cap_start_streaming, 123 .stop_streaming = meta_cap_stop_streaming, 124 .buf_request_complete = meta_cap_buf_request_complete, 125 }; 126 127 int vidioc_enum_fmt_meta_cap(struct file *file, void *priv, 128 struct v4l2_fmtdesc *f) 129 { 130 struct vivid_dev *dev = video_drvdata(file); 131 132 if (!vivid_is_webcam(dev)) 133 return -EINVAL; 134 135 if (f->index > 0) 136 return -EINVAL; 137 138 f->type = V4L2_BUF_TYPE_META_CAPTURE; 139 f->pixelformat = V4L2_META_FMT_UVC; 140 return 0; 141 } 142 143 int vidioc_g_fmt_meta_cap(struct file *file, void *priv, 144 struct v4l2_format *f) 145 { 146 struct vivid_dev *dev = video_drvdata(file); 147 struct v4l2_meta_format *meta = &f->fmt.meta; 148 149 if (!vivid_is_webcam(dev) || !dev->has_meta_cap) 150 return -EINVAL; 151 152 meta->dataformat = V4L2_META_FMT_UVC; 153 meta->buffersize = sizeof(struct vivid_uvc_meta_buf); 154 return 0; 155 } 156 157 void vivid_meta_cap_fillbuff(struct vivid_dev *dev, 158 struct vivid_buffer *buf, u64 soe) 159 { 160 struct vivid_uvc_meta_buf *meta = vb2_plane_vaddr(&buf->vb.vb2_buf, 0); 161 int buf_off = 0; 162 163 buf->vb.sequence = dev->meta_cap_seq_count; 164 if (dev->field_cap == V4L2_FIELD_ALTERNATE) 165 buf->vb.sequence /= 2; 166 memset(meta, 1, vb2_plane_size(&buf->vb.vb2_buf, 0)); 167 168 meta->ns = ktime_get_ns(); 169 meta->sof = buf->vb.sequence * 30; 170 meta->length = sizeof(*meta) - offsetof(struct vivid_uvc_meta_buf, length); 171 meta->flags = UVC_STREAM_EOH | UVC_STREAM_EOF; 172 173 if ((buf->vb.sequence % 2) == 0) 174 meta->flags |= UVC_STREAM_FID; 175 176 dprintk(dev, 2, "%s ns:%llu sof:%4d len:%u flags: 0x%02x", 177 __func__, meta->ns, meta->sof, meta->length, meta->flags); 178 if (dev->meta_pts) { 179 meta->flags |= UVC_STREAM_PTS; 180 meta->buf[0] = div_u64(soe, VIVID_META_CLOCK_UNIT); 181 buf_off = 4; 182 dprintk(dev, 2, " pts: %u\n", *(__u32 *)(meta->buf)); 183 } 184 185 if (dev->meta_scr) { 186 meta->flags |= UVC_STREAM_SCR; 187 meta->buf[buf_off] = div_u64((soe + dev->cap_frame_eof_offset), 188 VIVID_META_CLOCK_UNIT); 189 190 meta->buf[buf_off + 4] = (buf->vb.sequence * 30) % 1000; 191 dprintk(dev, 2, " stc: %u, sof counter: %u\n", 192 *(__u32 *)(meta->buf + buf_off), 193 *(__u16 *)(meta->buf + buf_off + 4)); 194 } 195 dprintk(dev, 2, "\n"); 196 } 197