1 // SPDX-License-Identifier: GPL-2.0+
2 /*
3 * Copyright (C) 2016 NextThing Co
4 * Copyright (C) 2016-2019 Bootlin
5 *
6 * Author: Maxime Ripard <maxime.ripard@bootlin.com>
7 */
8
9 #include <linux/device.h>
10 #include <linux/pm_runtime.h>
11
12 #include <media/v4l2-ioctl.h>
13 #include <media/v4l2-mc.h>
14 #include <media/videobuf2-v4l2.h>
15
16 #include "sun4i_csi.h"
17
18 #define CSI_DEFAULT_WIDTH 640
19 #define CSI_DEFAULT_HEIGHT 480
20
21 static const struct sun4i_csi_format sun4i_csi_formats[] = {
22 /* YUV422 inputs */
23 {
24 .mbus = MEDIA_BUS_FMT_YUYV8_2X8,
25 .fourcc = V4L2_PIX_FMT_YUV420M,
26 .input = CSI_INPUT_YUV,
27 .output = CSI_OUTPUT_YUV_420_PLANAR,
28 .num_planes = 3,
29 .bpp = { 8, 8, 8 },
30 .hsub = 2,
31 .vsub = 2,
32 },
33 };
34
sun4i_csi_find_format(const u32 * fourcc,const u32 * mbus)35 const struct sun4i_csi_format *sun4i_csi_find_format(const u32 *fourcc,
36 const u32 *mbus)
37 {
38 unsigned int i;
39
40 for (i = 0; i < ARRAY_SIZE(sun4i_csi_formats); i++) {
41 if (fourcc && *fourcc != sun4i_csi_formats[i].fourcc)
42 continue;
43
44 if (mbus && *mbus != sun4i_csi_formats[i].mbus)
45 continue;
46
47 return &sun4i_csi_formats[i];
48 }
49
50 return NULL;
51 }
52
sun4i_csi_querycap(struct file * file,void * priv,struct v4l2_capability * cap)53 static int sun4i_csi_querycap(struct file *file, void *priv,
54 struct v4l2_capability *cap)
55 {
56 struct sun4i_csi *csi = video_drvdata(file);
57
58 strscpy(cap->driver, KBUILD_MODNAME, sizeof(cap->driver));
59 strscpy(cap->card, "sun4i-csi", sizeof(cap->card));
60 snprintf(cap->bus_info, sizeof(cap->bus_info), "platform:%s",
61 dev_name(csi->dev));
62
63 return 0;
64 }
65
sun4i_csi_enum_input(struct file * file,void * priv,struct v4l2_input * inp)66 static int sun4i_csi_enum_input(struct file *file, void *priv,
67 struct v4l2_input *inp)
68 {
69 if (inp->index != 0)
70 return -EINVAL;
71
72 inp->type = V4L2_INPUT_TYPE_CAMERA;
73 strscpy(inp->name, "Camera", sizeof(inp->name));
74
75 return 0;
76 }
77
sun4i_csi_g_input(struct file * file,void * fh,unsigned int * i)78 static int sun4i_csi_g_input(struct file *file, void *fh,
79 unsigned int *i)
80 {
81 *i = 0;
82
83 return 0;
84 }
85
sun4i_csi_s_input(struct file * file,void * fh,unsigned int i)86 static int sun4i_csi_s_input(struct file *file, void *fh,
87 unsigned int i)
88 {
89 if (i != 0)
90 return -EINVAL;
91
92 return 0;
93 }
94
_sun4i_csi_try_fmt(struct sun4i_csi * csi,struct v4l2_pix_format_mplane * pix)95 static void _sun4i_csi_try_fmt(struct sun4i_csi *csi,
96 struct v4l2_pix_format_mplane *pix)
97 {
98 const struct sun4i_csi_format *_fmt;
99 unsigned int height, width;
100 unsigned int i;
101
102 _fmt = sun4i_csi_find_format(&pix->pixelformat, NULL);
103 if (!_fmt)
104 _fmt = &sun4i_csi_formats[0];
105
106 pix->field = V4L2_FIELD_NONE;
107 pix->colorspace = V4L2_COLORSPACE_SRGB;
108 pix->xfer_func = V4L2_MAP_XFER_FUNC_DEFAULT(pix->colorspace);
109 pix->ycbcr_enc = V4L2_MAP_YCBCR_ENC_DEFAULT(pix->colorspace);
110 pix->quantization = V4L2_MAP_QUANTIZATION_DEFAULT(true, pix->colorspace,
111 pix->ycbcr_enc);
112
113 pix->num_planes = _fmt->num_planes;
114 pix->pixelformat = _fmt->fourcc;
115
116 memset(pix->reserved, 0, sizeof(pix->reserved));
117
118 /* Align the width and height on the subsampling */
119 width = ALIGN(pix->width, _fmt->hsub);
120 height = ALIGN(pix->height, _fmt->vsub);
121
122 /* Clamp the width and height to our capabilities */
123 pix->width = clamp(width, _fmt->hsub, CSI_MAX_WIDTH);
124 pix->height = clamp(height, _fmt->vsub, CSI_MAX_HEIGHT);
125
126 for (i = 0; i < _fmt->num_planes; i++) {
127 unsigned int hsub = i > 0 ? _fmt->hsub : 1;
128 unsigned int vsub = i > 0 ? _fmt->vsub : 1;
129 unsigned int bpl;
130
131 bpl = pix->width / hsub * _fmt->bpp[i] / 8;
132 pix->plane_fmt[i].bytesperline = bpl;
133 pix->plane_fmt[i].sizeimage = bpl * pix->height / vsub;
134 memset(pix->plane_fmt[i].reserved, 0,
135 sizeof(pix->plane_fmt[i].reserved));
136 }
137 }
138
sun4i_csi_try_fmt_vid_cap(struct file * file,void * priv,struct v4l2_format * f)139 static int sun4i_csi_try_fmt_vid_cap(struct file *file, void *priv,
140 struct v4l2_format *f)
141 {
142 struct sun4i_csi *csi = video_drvdata(file);
143
144 _sun4i_csi_try_fmt(csi, &f->fmt.pix_mp);
145
146 return 0;
147 }
148
sun4i_csi_s_fmt_vid_cap(struct file * file,void * priv,struct v4l2_format * f)149 static int sun4i_csi_s_fmt_vid_cap(struct file *file, void *priv,
150 struct v4l2_format *f)
151 {
152 struct sun4i_csi *csi = video_drvdata(file);
153
154 _sun4i_csi_try_fmt(csi, &f->fmt.pix_mp);
155 csi->fmt = f->fmt.pix_mp;
156
157 return 0;
158 }
159
sun4i_csi_g_fmt_vid_cap(struct file * file,void * priv,struct v4l2_format * f)160 static int sun4i_csi_g_fmt_vid_cap(struct file *file, void *priv,
161 struct v4l2_format *f)
162 {
163 struct sun4i_csi *csi = video_drvdata(file);
164
165 f->fmt.pix_mp = csi->fmt;
166
167 return 0;
168 }
169
sun4i_csi_enum_fmt_vid_cap(struct file * file,void * priv,struct v4l2_fmtdesc * f)170 static int sun4i_csi_enum_fmt_vid_cap(struct file *file, void *priv,
171 struct v4l2_fmtdesc *f)
172 {
173 if (f->index >= ARRAY_SIZE(sun4i_csi_formats))
174 return -EINVAL;
175
176 f->pixelformat = sun4i_csi_formats[f->index].fourcc;
177
178 return 0;
179 }
180
181 static const struct v4l2_ioctl_ops sun4i_csi_ioctl_ops = {
182 .vidioc_querycap = sun4i_csi_querycap,
183
184 .vidioc_enum_fmt_vid_cap = sun4i_csi_enum_fmt_vid_cap,
185 .vidioc_g_fmt_vid_cap_mplane = sun4i_csi_g_fmt_vid_cap,
186 .vidioc_s_fmt_vid_cap_mplane = sun4i_csi_s_fmt_vid_cap,
187 .vidioc_try_fmt_vid_cap_mplane = sun4i_csi_try_fmt_vid_cap,
188
189 .vidioc_enum_input = sun4i_csi_enum_input,
190 .vidioc_g_input = sun4i_csi_g_input,
191 .vidioc_s_input = sun4i_csi_s_input,
192
193 .vidioc_reqbufs = vb2_ioctl_reqbufs,
194 .vidioc_create_bufs = vb2_ioctl_create_bufs,
195 .vidioc_querybuf = vb2_ioctl_querybuf,
196 .vidioc_qbuf = vb2_ioctl_qbuf,
197 .vidioc_dqbuf = vb2_ioctl_dqbuf,
198 .vidioc_expbuf = vb2_ioctl_expbuf,
199 .vidioc_prepare_buf = vb2_ioctl_prepare_buf,
200 .vidioc_streamon = vb2_ioctl_streamon,
201 .vidioc_streamoff = vb2_ioctl_streamoff,
202 };
203
sun4i_csi_open(struct file * file)204 static int sun4i_csi_open(struct file *file)
205 {
206 struct sun4i_csi *csi = video_drvdata(file);
207 int ret;
208
209 ret = mutex_lock_interruptible(&csi->lock);
210 if (ret)
211 return ret;
212
213 ret = pm_runtime_get_sync(csi->dev);
214 if (ret < 0)
215 goto err_pm_put;
216
217 ret = v4l2_pipeline_pm_get(&csi->vdev.entity);
218 if (ret)
219 goto err_pm_put;
220
221 ret = v4l2_fh_open(file);
222 if (ret)
223 goto err_pipeline_pm_put;
224
225 mutex_unlock(&csi->lock);
226
227 return 0;
228
229 err_pipeline_pm_put:
230 v4l2_pipeline_pm_put(&csi->vdev.entity);
231
232 err_pm_put:
233 pm_runtime_put(csi->dev);
234 mutex_unlock(&csi->lock);
235
236 return ret;
237 }
238
sun4i_csi_release(struct file * file)239 static int sun4i_csi_release(struct file *file)
240 {
241 struct sun4i_csi *csi = video_drvdata(file);
242
243 mutex_lock(&csi->lock);
244
245 _vb2_fop_release(file, NULL);
246
247 v4l2_pipeline_pm_put(&csi->vdev.entity);
248 pm_runtime_put(csi->dev);
249
250 mutex_unlock(&csi->lock);
251
252 return 0;
253 }
254
255 static const struct v4l2_file_operations sun4i_csi_fops = {
256 .owner = THIS_MODULE,
257 .open = sun4i_csi_open,
258 .release = sun4i_csi_release,
259 .unlocked_ioctl = video_ioctl2,
260 .poll = vb2_fop_poll,
261 .mmap = vb2_fop_mmap,
262 };
263
264 static const struct v4l2_mbus_framefmt sun4i_csi_pad_fmt_default = {
265 .width = CSI_DEFAULT_WIDTH,
266 .height = CSI_DEFAULT_HEIGHT,
267 .code = MEDIA_BUS_FMT_YUYV8_2X8,
268 .field = V4L2_FIELD_NONE,
269 .colorspace = V4L2_COLORSPACE_RAW,
270 .ycbcr_enc = V4L2_YCBCR_ENC_DEFAULT,
271 .quantization = V4L2_QUANTIZATION_DEFAULT,
272 .xfer_func = V4L2_XFER_FUNC_DEFAULT,
273 };
274
sun4i_csi_subdev_init_cfg(struct v4l2_subdev * subdev,struct v4l2_subdev_pad_config * cfg)275 static int sun4i_csi_subdev_init_cfg(struct v4l2_subdev *subdev,
276 struct v4l2_subdev_pad_config *cfg)
277 {
278 struct v4l2_mbus_framefmt *fmt;
279
280 fmt = v4l2_subdev_get_try_format(subdev, cfg, CSI_SUBDEV_SINK);
281 *fmt = sun4i_csi_pad_fmt_default;
282
283 return 0;
284 }
285
sun4i_csi_subdev_get_fmt(struct v4l2_subdev * subdev,struct v4l2_subdev_pad_config * cfg,struct v4l2_subdev_format * fmt)286 static int sun4i_csi_subdev_get_fmt(struct v4l2_subdev *subdev,
287 struct v4l2_subdev_pad_config *cfg,
288 struct v4l2_subdev_format *fmt)
289 {
290 struct sun4i_csi *csi = container_of(subdev, struct sun4i_csi, subdev);
291 struct v4l2_mbus_framefmt *subdev_fmt;
292
293 if (fmt->which == V4L2_SUBDEV_FORMAT_TRY)
294 subdev_fmt = v4l2_subdev_get_try_format(subdev, cfg, fmt->pad);
295 else
296 subdev_fmt = &csi->subdev_fmt;
297
298 fmt->format = *subdev_fmt;
299
300 return 0;
301 }
302
sun4i_csi_subdev_set_fmt(struct v4l2_subdev * subdev,struct v4l2_subdev_pad_config * cfg,struct v4l2_subdev_format * fmt)303 static int sun4i_csi_subdev_set_fmt(struct v4l2_subdev *subdev,
304 struct v4l2_subdev_pad_config *cfg,
305 struct v4l2_subdev_format *fmt)
306 {
307 struct sun4i_csi *csi = container_of(subdev, struct sun4i_csi, subdev);
308 struct v4l2_mbus_framefmt *subdev_fmt;
309
310 if (fmt->which == V4L2_SUBDEV_FORMAT_TRY)
311 subdev_fmt = v4l2_subdev_get_try_format(subdev, cfg, fmt->pad);
312 else
313 subdev_fmt = &csi->subdev_fmt;
314
315 /* We can only set the format on the sink pad */
316 if (fmt->pad == CSI_SUBDEV_SINK) {
317 /* It's the sink, only allow changing the frame size */
318 subdev_fmt->width = fmt->format.width;
319 subdev_fmt->height = fmt->format.height;
320 subdev_fmt->code = fmt->format.code;
321 }
322
323 fmt->format = *subdev_fmt;
324
325 return 0;
326 }
327
328 static int
sun4i_csi_subdev_enum_mbus_code(struct v4l2_subdev * subdev,struct v4l2_subdev_pad_config * cfg,struct v4l2_subdev_mbus_code_enum * mbus)329 sun4i_csi_subdev_enum_mbus_code(struct v4l2_subdev *subdev,
330 struct v4l2_subdev_pad_config *cfg,
331 struct v4l2_subdev_mbus_code_enum *mbus)
332 {
333 if (mbus->index >= ARRAY_SIZE(sun4i_csi_formats))
334 return -EINVAL;
335
336 mbus->code = sun4i_csi_formats[mbus->index].mbus;
337
338 return 0;
339 }
340
341 static const struct v4l2_subdev_pad_ops sun4i_csi_subdev_pad_ops = {
342 .link_validate = v4l2_subdev_link_validate_default,
343 .init_cfg = sun4i_csi_subdev_init_cfg,
344 .get_fmt = sun4i_csi_subdev_get_fmt,
345 .set_fmt = sun4i_csi_subdev_set_fmt,
346 .enum_mbus_code = sun4i_csi_subdev_enum_mbus_code,
347 };
348
349 const struct v4l2_subdev_ops sun4i_csi_subdev_ops = {
350 .pad = &sun4i_csi_subdev_pad_ops,
351 };
352
sun4i_csi_v4l2_register(struct sun4i_csi * csi)353 int sun4i_csi_v4l2_register(struct sun4i_csi *csi)
354 {
355 struct video_device *vdev = &csi->vdev;
356 int ret;
357
358 vdev->device_caps = V4L2_CAP_VIDEO_CAPTURE_MPLANE | V4L2_CAP_STREAMING;
359 vdev->v4l2_dev = &csi->v4l;
360 vdev->queue = &csi->queue;
361 strscpy(vdev->name, KBUILD_MODNAME, sizeof(vdev->name));
362 vdev->release = video_device_release_empty;
363 vdev->lock = &csi->lock;
364
365 /* Set a default format */
366 csi->fmt.pixelformat = sun4i_csi_formats[0].fourcc,
367 csi->fmt.width = CSI_DEFAULT_WIDTH;
368 csi->fmt.height = CSI_DEFAULT_HEIGHT;
369 _sun4i_csi_try_fmt(csi, &csi->fmt);
370 csi->subdev_fmt = sun4i_csi_pad_fmt_default;
371
372 vdev->fops = &sun4i_csi_fops;
373 vdev->ioctl_ops = &sun4i_csi_ioctl_ops;
374 video_set_drvdata(vdev, csi);
375
376 ret = video_register_device(&csi->vdev, VFL_TYPE_VIDEO, -1);
377 if (ret)
378 return ret;
379
380 dev_info(csi->dev, "Device registered as %s\n",
381 video_device_node_name(vdev));
382
383 return 0;
384 }
385