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e55222ef GL |
1 | /* |
2 | * camera image capture (abstract) bus driver | |
3 | * | |
4 | * Copyright (C) 2008, Guennadi Liakhovetski <kernel@pengutronix.de> | |
5 | * | |
6 | * This driver provides an interface between platform-specific camera | |
7 | * busses and camera devices. It should be used if the camera is | |
8 | * connected not over a "proper" bus like PCI or USB, but over a | |
9 | * special bus, like, for example, the Quick Capture interface on PXA270 | |
10 | * SoCs. Later it should also be used for i.MX31 SoCs from Freescale. | |
11 | * It can handle multiple cameras and / or multiple busses, which can | |
12 | * be used, e.g., in stereo-vision applications. | |
13 | * | |
14 | * This program is free software; you can redistribute it and/or modify | |
15 | * it under the terms of the GNU General Public License version 2 as | |
16 | * published by the Free Software Foundation. | |
17 | */ | |
18 | ||
19 | #include <linux/module.h> | |
20 | #include <linux/init.h> | |
21 | #include <linux/device.h> | |
22 | #include <linux/list.h> | |
23 | #include <linux/err.h> | |
24 | #include <linux/mutex.h> | |
25 | #include <linux/vmalloc.h> | |
26 | ||
27 | #include <media/v4l2-common.h> | |
28 | #include <media/v4l2-dev.h> | |
092d3921 | 29 | #include <media/videobuf-core.h> |
e55222ef GL |
30 | #include <media/soc_camera.h> |
31 | ||
32 | static LIST_HEAD(hosts); | |
33 | static LIST_HEAD(devices); | |
34 | static DEFINE_MUTEX(list_lock); | |
35 | static DEFINE_MUTEX(video_lock); | |
36 | ||
37 | const static struct soc_camera_data_format* | |
38 | format_by_fourcc(struct soc_camera_device *icd, unsigned int fourcc) | |
39 | { | |
40 | unsigned int i; | |
41 | ||
26f1b942 GL |
42 | for (i = 0; i < icd->num_formats; i++) |
43 | if (icd->formats[i].fourcc == fourcc) | |
44 | return icd->formats + i; | |
e55222ef GL |
45 | return NULL; |
46 | } | |
47 | ||
72937890 | 48 | static int soc_camera_try_fmt_vid_cap(struct file *file, void *priv, |
e55222ef GL |
49 | struct v4l2_format *f) |
50 | { | |
51 | struct soc_camera_file *icf = file->private_data; | |
52 | struct soc_camera_device *icd = icf->icd; | |
53 | struct soc_camera_host *ici = | |
54 | to_soc_camera_host(icd->dev.parent); | |
55 | enum v4l2_field field; | |
56 | const struct soc_camera_data_format *fmt; | |
57 | int ret; | |
58 | ||
59 | WARN_ON(priv != file->private_data); | |
60 | ||
61 | fmt = format_by_fourcc(icd, f->fmt.pix.pixelformat); | |
62 | if (!fmt) { | |
63 | dev_dbg(&icd->dev, "invalid format 0x%08x\n", | |
64 | f->fmt.pix.pixelformat); | |
65 | return -EINVAL; | |
66 | } | |
67 | ||
68 | dev_dbg(&icd->dev, "fmt: 0x%08x\n", fmt->fourcc); | |
69 | ||
70 | field = f->fmt.pix.field; | |
71 | ||
72 | if (field == V4L2_FIELD_ANY) { | |
73 | field = V4L2_FIELD_NONE; | |
74 | } else if (V4L2_FIELD_NONE != field) { | |
75 | dev_err(&icd->dev, "Field type invalid.\n"); | |
76 | return -EINVAL; | |
77 | } | |
78 | ||
ad5f2e85 | 79 | /* test physical bus parameters */ |
b8d9904c | 80 | ret = ici->ops->try_bus_param(icd, f->fmt.pix.pixelformat); |
ad5f2e85 GL |
81 | if (ret) |
82 | return ret; | |
e55222ef | 83 | |
ad5f2e85 | 84 | /* limit format to hardware capabilities */ |
b8d9904c | 85 | ret = ici->ops->try_fmt_cap(icd, f); |
e55222ef GL |
86 | |
87 | /* calculate missing fields */ | |
88 | f->fmt.pix.field = field; | |
89 | f->fmt.pix.bytesperline = | |
90 | (f->fmt.pix.width * fmt->depth) >> 3; | |
91 | f->fmt.pix.sizeimage = | |
92 | f->fmt.pix.height * f->fmt.pix.bytesperline; | |
93 | ||
94 | return ret; | |
95 | } | |
96 | ||
97 | static int soc_camera_enum_input(struct file *file, void *priv, | |
98 | struct v4l2_input *inp) | |
99 | { | |
100 | if (inp->index != 0) | |
101 | return -EINVAL; | |
102 | ||
103 | inp->type = V4L2_INPUT_TYPE_CAMERA; | |
104 | inp->std = V4L2_STD_UNKNOWN; | |
105 | strcpy(inp->name, "Camera"); | |
106 | ||
107 | return 0; | |
108 | } | |
109 | ||
110 | static int soc_camera_g_input(struct file *file, void *priv, unsigned int *i) | |
111 | { | |
112 | *i = 0; | |
113 | ||
114 | return 0; | |
115 | } | |
116 | ||
117 | static int soc_camera_s_input(struct file *file, void *priv, unsigned int i) | |
118 | { | |
119 | if (i > 0) | |
120 | return -EINVAL; | |
121 | ||
122 | return 0; | |
123 | } | |
124 | ||
125 | static int soc_camera_s_std(struct file *file, void *priv, v4l2_std_id *a) | |
126 | { | |
127 | return 0; | |
128 | } | |
129 | ||
130 | static int soc_camera_reqbufs(struct file *file, void *priv, | |
131 | struct v4l2_requestbuffers *p) | |
132 | { | |
133 | int ret; | |
134 | struct soc_camera_file *icf = file->private_data; | |
135 | struct soc_camera_device *icd = icf->icd; | |
136 | struct soc_camera_host *ici = | |
137 | to_soc_camera_host(icd->dev.parent); | |
138 | ||
139 | WARN_ON(priv != file->private_data); | |
140 | ||
7e28adb2 | 141 | dev_dbg(&icd->dev, "%s: %d\n", __func__, p->memory); |
e55222ef GL |
142 | |
143 | ret = videobuf_reqbufs(&icf->vb_vidq, p); | |
144 | if (ret < 0) | |
145 | return ret; | |
146 | ||
b8d9904c | 147 | return ici->ops->reqbufs(icf, p); |
e55222ef GL |
148 | } |
149 | ||
150 | static int soc_camera_querybuf(struct file *file, void *priv, | |
151 | struct v4l2_buffer *p) | |
152 | { | |
153 | struct soc_camera_file *icf = file->private_data; | |
154 | ||
155 | WARN_ON(priv != file->private_data); | |
156 | ||
157 | return videobuf_querybuf(&icf->vb_vidq, p); | |
158 | } | |
159 | ||
160 | static int soc_camera_qbuf(struct file *file, void *priv, | |
161 | struct v4l2_buffer *p) | |
162 | { | |
163 | struct soc_camera_file *icf = file->private_data; | |
164 | ||
165 | WARN_ON(priv != file->private_data); | |
166 | ||
167 | return videobuf_qbuf(&icf->vb_vidq, p); | |
168 | } | |
169 | ||
170 | static int soc_camera_dqbuf(struct file *file, void *priv, | |
171 | struct v4l2_buffer *p) | |
172 | { | |
173 | struct soc_camera_file *icf = file->private_data; | |
174 | ||
175 | WARN_ON(priv != file->private_data); | |
176 | ||
177 | return videobuf_dqbuf(&icf->vb_vidq, p, file->f_flags & O_NONBLOCK); | |
178 | } | |
179 | ||
180 | static int soc_camera_open(struct inode *inode, struct file *file) | |
181 | { | |
9dc4e48f GL |
182 | struct video_device *vdev; |
183 | struct soc_camera_device *icd; | |
184 | struct soc_camera_host *ici; | |
e55222ef GL |
185 | struct soc_camera_file *icf; |
186 | int ret; | |
187 | ||
188 | icf = vmalloc(sizeof(*icf)); | |
189 | if (!icf) | |
190 | return -ENOMEM; | |
191 | ||
9dc4e48f GL |
192 | /* Protect against icd->remove() until we module_get() both drivers. */ |
193 | mutex_lock(&video_lock); | |
194 | ||
195 | vdev = video_devdata(file); | |
196 | icd = container_of(vdev->dev, struct soc_camera_device, dev); | |
197 | ici = to_soc_camera_host(icd->dev.parent); | |
e55222ef GL |
198 | |
199 | if (!try_module_get(icd->ops->owner)) { | |
200 | dev_err(&icd->dev, "Couldn't lock sensor driver.\n"); | |
201 | ret = -EINVAL; | |
202 | goto emgd; | |
203 | } | |
204 | ||
b8d9904c | 205 | if (!try_module_get(ici->ops->owner)) { |
e55222ef GL |
206 | dev_err(&icd->dev, "Couldn't lock capture bus driver.\n"); |
207 | ret = -EINVAL; | |
208 | goto emgi; | |
209 | } | |
210 | ||
9dc4e48f | 211 | icf->icd = icd; |
1a0063a9 GL |
212 | icd->use_count++; |
213 | ||
9dc4e48f GL |
214 | /* Now we really have to activate the camera */ |
215 | if (icd->use_count == 1) { | |
b8d9904c | 216 | ret = ici->ops->add(icd); |
9dc4e48f GL |
217 | if (ret < 0) { |
218 | dev_err(&icd->dev, "Couldn't activate the camera: %d\n", ret); | |
219 | icd->use_count--; | |
220 | goto eiciadd; | |
221 | } | |
222 | } | |
223 | ||
224 | mutex_unlock(&video_lock); | |
225 | ||
e55222ef GL |
226 | file->private_data = icf; |
227 | dev_dbg(&icd->dev, "camera device open\n"); | |
228 | ||
a034d1b7 | 229 | ici->ops->init_videobuf(&icf->vb_vidq, icd); |
e55222ef GL |
230 | |
231 | return 0; | |
232 | ||
9dc4e48f GL |
233 | /* All errors are entered with the video_lock held */ |
234 | eiciadd: | |
b8d9904c | 235 | module_put(ici->ops->owner); |
e55222ef GL |
236 | emgi: |
237 | module_put(icd->ops->owner); | |
238 | emgd: | |
9dc4e48f | 239 | mutex_unlock(&video_lock); |
e55222ef GL |
240 | vfree(icf); |
241 | return ret; | |
242 | } | |
243 | ||
244 | static int soc_camera_close(struct inode *inode, struct file *file) | |
245 | { | |
246 | struct soc_camera_file *icf = file->private_data; | |
247 | struct soc_camera_device *icd = icf->icd; | |
248 | struct soc_camera_host *ici = to_soc_camera_host(icd->dev.parent); | |
249 | struct video_device *vdev = icd->vdev; | |
250 | ||
9dc4e48f GL |
251 | mutex_lock(&video_lock); |
252 | icd->use_count--; | |
253 | if (!icd->use_count) | |
b8d9904c | 254 | ici->ops->remove(icd); |
e55222ef | 255 | module_put(icd->ops->owner); |
b8d9904c | 256 | module_put(ici->ops->owner); |
9dc4e48f GL |
257 | mutex_unlock(&video_lock); |
258 | ||
1a0063a9 | 259 | vfree(icf); |
e55222ef GL |
260 | |
261 | dev_dbg(vdev->dev, "camera device close\n"); | |
262 | ||
263 | return 0; | |
264 | } | |
265 | ||
aba360d8 | 266 | static ssize_t soc_camera_read(struct file *file, char __user *buf, |
e55222ef GL |
267 | size_t count, loff_t *ppos) |
268 | { | |
269 | struct soc_camera_file *icf = file->private_data; | |
270 | struct soc_camera_device *icd = icf->icd; | |
271 | struct video_device *vdev = icd->vdev; | |
272 | int err = -EINVAL; | |
273 | ||
274 | dev_err(vdev->dev, "camera device read not implemented\n"); | |
275 | ||
276 | return err; | |
277 | } | |
278 | ||
279 | static int soc_camera_mmap(struct file *file, struct vm_area_struct *vma) | |
280 | { | |
281 | struct soc_camera_file *icf = file->private_data; | |
282 | struct soc_camera_device *icd = icf->icd; | |
283 | int err; | |
284 | ||
285 | dev_dbg(&icd->dev, "mmap called, vma=0x%08lx\n", (unsigned long)vma); | |
286 | ||
287 | err = videobuf_mmap_mapper(&icf->vb_vidq, vma); | |
288 | ||
289 | dev_dbg(&icd->dev, "vma start=0x%08lx, size=%ld, ret=%d\n", | |
290 | (unsigned long)vma->vm_start, | |
291 | (unsigned long)vma->vm_end - (unsigned long)vma->vm_start, | |
292 | err); | |
293 | ||
294 | return err; | |
295 | } | |
296 | ||
297 | static unsigned int soc_camera_poll(struct file *file, poll_table *pt) | |
298 | { | |
299 | struct soc_camera_file *icf = file->private_data; | |
300 | struct soc_camera_device *icd = icf->icd; | |
301 | struct soc_camera_host *ici = | |
302 | to_soc_camera_host(icd->dev.parent); | |
303 | ||
304 | if (list_empty(&icf->vb_vidq.stream)) { | |
305 | dev_err(&icd->dev, "Trying to poll with no queued buffers!\n"); | |
306 | return POLLERR; | |
307 | } | |
308 | ||
b8d9904c | 309 | return ici->ops->poll(file, pt); |
e55222ef GL |
310 | } |
311 | ||
312 | ||
313 | static struct file_operations soc_camera_fops = { | |
314 | .owner = THIS_MODULE, | |
315 | .open = soc_camera_open, | |
316 | .release = soc_camera_close, | |
317 | .ioctl = video_ioctl2, | |
318 | .read = soc_camera_read, | |
319 | .mmap = soc_camera_mmap, | |
320 | .poll = soc_camera_poll, | |
321 | .llseek = no_llseek, | |
322 | }; | |
323 | ||
324 | ||
72937890 | 325 | static int soc_camera_s_fmt_vid_cap(struct file *file, void *priv, |
e55222ef GL |
326 | struct v4l2_format *f) |
327 | { | |
328 | struct soc_camera_file *icf = file->private_data; | |
329 | struct soc_camera_device *icd = icf->icd; | |
330 | struct soc_camera_host *ici = | |
331 | to_soc_camera_host(icd->dev.parent); | |
332 | int ret; | |
333 | struct v4l2_rect rect; | |
334 | const static struct soc_camera_data_format *data_fmt; | |
335 | ||
336 | WARN_ON(priv != file->private_data); | |
337 | ||
338 | data_fmt = format_by_fourcc(icd, f->fmt.pix.pixelformat); | |
339 | if (!data_fmt) | |
340 | return -EINVAL; | |
341 | ||
ad5f2e85 GL |
342 | /* buswidth may be further adjusted by the ici */ |
343 | icd->buswidth = data_fmt->depth; | |
e55222ef | 344 | |
72937890 | 345 | ret = soc_camera_try_fmt_vid_cap(file, icf, f); |
e55222ef GL |
346 | if (ret < 0) |
347 | return ret; | |
348 | ||
349 | rect.left = icd->x_current; | |
350 | rect.top = icd->y_current; | |
351 | rect.width = f->fmt.pix.width; | |
352 | rect.height = f->fmt.pix.height; | |
b8d9904c | 353 | ret = ici->ops->set_fmt_cap(icd, f->fmt.pix.pixelformat, &rect); |
ad5f2e85 GL |
354 | if (ret < 0) |
355 | return ret; | |
e55222ef | 356 | |
ad5f2e85 GL |
357 | icd->current_fmt = data_fmt; |
358 | icd->width = rect.width; | |
359 | icd->height = rect.height; | |
360 | icf->vb_vidq.field = f->fmt.pix.field; | |
361 | if (V4L2_BUF_TYPE_VIDEO_CAPTURE != f->type) | |
362 | dev_warn(&icd->dev, "Attention! Wrong buf-type %d\n", | |
363 | f->type); | |
e55222ef | 364 | |
ad5f2e85 GL |
365 | dev_dbg(&icd->dev, "set width: %d height: %d\n", |
366 | icd->width, icd->height); | |
367 | ||
368 | /* set physical bus parameters */ | |
b8d9904c | 369 | return ici->ops->set_bus_param(icd, f->fmt.pix.pixelformat); |
e55222ef GL |
370 | } |
371 | ||
72937890 | 372 | static int soc_camera_enum_fmt_vid_cap(struct file *file, void *priv, |
e55222ef GL |
373 | struct v4l2_fmtdesc *f) |
374 | { | |
375 | struct soc_camera_file *icf = file->private_data; | |
376 | struct soc_camera_device *icd = icf->icd; | |
377 | const struct soc_camera_data_format *format; | |
378 | ||
379 | WARN_ON(priv != file->private_data); | |
380 | ||
26f1b942 | 381 | if (f->index >= icd->num_formats) |
e55222ef GL |
382 | return -EINVAL; |
383 | ||
26f1b942 | 384 | format = &icd->formats[f->index]; |
e55222ef GL |
385 | |
386 | strlcpy(f->description, format->name, sizeof(f->description)); | |
387 | f->pixelformat = format->fourcc; | |
388 | return 0; | |
389 | } | |
390 | ||
72937890 | 391 | static int soc_camera_g_fmt_vid_cap(struct file *file, void *priv, |
e55222ef GL |
392 | struct v4l2_format *f) |
393 | { | |
394 | struct soc_camera_file *icf = file->private_data; | |
395 | struct soc_camera_device *icd = icf->icd; | |
396 | ||
397 | WARN_ON(priv != file->private_data); | |
398 | ||
399 | f->fmt.pix.width = icd->width; | |
400 | f->fmt.pix.height = icd->height; | |
401 | f->fmt.pix.field = icf->vb_vidq.field; | |
402 | f->fmt.pix.pixelformat = icd->current_fmt->fourcc; | |
403 | f->fmt.pix.bytesperline = | |
404 | (f->fmt.pix.width * icd->current_fmt->depth) >> 3; | |
405 | f->fmt.pix.sizeimage = | |
406 | f->fmt.pix.height * f->fmt.pix.bytesperline; | |
407 | dev_dbg(&icd->dev, "current_fmt->fourcc: 0x%08x\n", | |
408 | icd->current_fmt->fourcc); | |
409 | return 0; | |
410 | } | |
411 | ||
412 | static int soc_camera_querycap(struct file *file, void *priv, | |
413 | struct v4l2_capability *cap) | |
414 | { | |
415 | struct soc_camera_file *icf = file->private_data; | |
416 | struct soc_camera_device *icd = icf->icd; | |
417 | struct soc_camera_host *ici = | |
418 | to_soc_camera_host(icd->dev.parent); | |
419 | ||
420 | WARN_ON(priv != file->private_data); | |
421 | ||
422 | strlcpy(cap->driver, ici->drv_name, sizeof(cap->driver)); | |
b8d9904c | 423 | return ici->ops->querycap(ici, cap); |
e55222ef GL |
424 | } |
425 | ||
426 | static int soc_camera_streamon(struct file *file, void *priv, | |
427 | enum v4l2_buf_type i) | |
428 | { | |
429 | struct soc_camera_file *icf = file->private_data; | |
430 | struct soc_camera_device *icd = icf->icd; | |
431 | ||
432 | WARN_ON(priv != file->private_data); | |
433 | ||
7e28adb2 | 434 | dev_dbg(&icd->dev, "%s\n", __func__); |
e55222ef GL |
435 | |
436 | if (i != V4L2_BUF_TYPE_VIDEO_CAPTURE) | |
437 | return -EINVAL; | |
438 | ||
439 | icd->ops->start_capture(icd); | |
440 | ||
441 | /* This calls buf_queue from host driver's videobuf_queue_ops */ | |
442 | return videobuf_streamon(&icf->vb_vidq); | |
443 | } | |
444 | ||
445 | static int soc_camera_streamoff(struct file *file, void *priv, | |
446 | enum v4l2_buf_type i) | |
447 | { | |
448 | struct soc_camera_file *icf = file->private_data; | |
449 | struct soc_camera_device *icd = icf->icd; | |
450 | ||
451 | WARN_ON(priv != file->private_data); | |
452 | ||
7e28adb2 | 453 | dev_dbg(&icd->dev, "%s\n", __func__); |
e55222ef GL |
454 | |
455 | if (i != V4L2_BUF_TYPE_VIDEO_CAPTURE) | |
456 | return -EINVAL; | |
457 | ||
458 | /* This calls buf_release from host driver's videobuf_queue_ops for all | |
459 | * remaining buffers. When the last buffer is freed, stop capture */ | |
460 | videobuf_streamoff(&icf->vb_vidq); | |
461 | ||
462 | icd->ops->stop_capture(icd); | |
463 | ||
464 | return 0; | |
465 | } | |
466 | ||
467 | static int soc_camera_queryctrl(struct file *file, void *priv, | |
468 | struct v4l2_queryctrl *qc) | |
469 | { | |
470 | struct soc_camera_file *icf = file->private_data; | |
471 | struct soc_camera_device *icd = icf->icd; | |
472 | int i; | |
473 | ||
474 | WARN_ON(priv != file->private_data); | |
475 | ||
476 | if (!qc->id) | |
477 | return -EINVAL; | |
478 | ||
479 | for (i = 0; i < icd->ops->num_controls; i++) | |
480 | if (qc->id == icd->ops->controls[i].id) { | |
481 | memcpy(qc, &(icd->ops->controls[i]), | |
482 | sizeof(*qc)); | |
483 | return 0; | |
484 | } | |
485 | ||
486 | return -EINVAL; | |
487 | } | |
488 | ||
489 | static int soc_camera_g_ctrl(struct file *file, void *priv, | |
490 | struct v4l2_control *ctrl) | |
491 | { | |
492 | struct soc_camera_file *icf = file->private_data; | |
493 | struct soc_camera_device *icd = icf->icd; | |
494 | ||
495 | WARN_ON(priv != file->private_data); | |
496 | ||
497 | switch (ctrl->id) { | |
498 | case V4L2_CID_GAIN: | |
499 | if (icd->gain == (unsigned short)~0) | |
500 | return -EINVAL; | |
501 | ctrl->value = icd->gain; | |
502 | return 0; | |
503 | case V4L2_CID_EXPOSURE: | |
504 | if (icd->exposure == (unsigned short)~0) | |
505 | return -EINVAL; | |
506 | ctrl->value = icd->exposure; | |
507 | return 0; | |
508 | } | |
509 | ||
510 | if (icd->ops->get_control) | |
511 | return icd->ops->get_control(icd, ctrl); | |
512 | return -EINVAL; | |
513 | } | |
514 | ||
515 | static int soc_camera_s_ctrl(struct file *file, void *priv, | |
516 | struct v4l2_control *ctrl) | |
517 | { | |
518 | struct soc_camera_file *icf = file->private_data; | |
519 | struct soc_camera_device *icd = icf->icd; | |
520 | ||
521 | WARN_ON(priv != file->private_data); | |
522 | ||
523 | if (icd->ops->set_control) | |
524 | return icd->ops->set_control(icd, ctrl); | |
525 | return -EINVAL; | |
526 | } | |
527 | ||
528 | static int soc_camera_cropcap(struct file *file, void *fh, | |
529 | struct v4l2_cropcap *a) | |
530 | { | |
531 | struct soc_camera_file *icf = file->private_data; | |
532 | struct soc_camera_device *icd = icf->icd; | |
533 | ||
534 | a->type = V4L2_BUF_TYPE_VIDEO_CAPTURE; | |
535 | a->bounds.left = icd->x_min; | |
536 | a->bounds.top = icd->y_min; | |
537 | a->bounds.width = icd->width_max; | |
538 | a->bounds.height = icd->height_max; | |
539 | a->defrect.left = icd->x_min; | |
540 | a->defrect.top = icd->y_min; | |
541 | a->defrect.width = 640; | |
542 | a->defrect.height = 480; | |
543 | a->pixelaspect.numerator = 1; | |
544 | a->pixelaspect.denominator = 1; | |
545 | ||
546 | return 0; | |
547 | } | |
548 | ||
549 | static int soc_camera_g_crop(struct file *file, void *fh, | |
550 | struct v4l2_crop *a) | |
551 | { | |
552 | struct soc_camera_file *icf = file->private_data; | |
553 | struct soc_camera_device *icd = icf->icd; | |
554 | ||
555 | a->type = V4L2_BUF_TYPE_VIDEO_CAPTURE; | |
556 | a->c.left = icd->x_current; | |
557 | a->c.top = icd->y_current; | |
558 | a->c.width = icd->width; | |
559 | a->c.height = icd->height; | |
560 | ||
561 | return 0; | |
562 | } | |
563 | ||
564 | static int soc_camera_s_crop(struct file *file, void *fh, | |
565 | struct v4l2_crop *a) | |
566 | { | |
567 | struct soc_camera_file *icf = file->private_data; | |
568 | struct soc_camera_device *icd = icf->icd; | |
569 | struct soc_camera_host *ici = | |
570 | to_soc_camera_host(icd->dev.parent); | |
571 | int ret; | |
572 | ||
573 | if (a->type != V4L2_BUF_TYPE_VIDEO_CAPTURE) | |
574 | return -EINVAL; | |
575 | ||
b8d9904c | 576 | ret = ici->ops->set_fmt_cap(icd, 0, &a->c); |
e55222ef GL |
577 | if (!ret) { |
578 | icd->width = a->c.width; | |
579 | icd->height = a->c.height; | |
580 | icd->x_current = a->c.left; | |
581 | icd->y_current = a->c.top; | |
582 | } | |
583 | ||
584 | return ret; | |
585 | } | |
586 | ||
587 | static int soc_camera_g_chip_ident(struct file *file, void *fh, | |
588 | struct v4l2_chip_ident *id) | |
589 | { | |
590 | struct soc_camera_file *icf = file->private_data; | |
591 | struct soc_camera_device *icd = icf->icd; | |
592 | ||
593 | if (!icd->ops->get_chip_id) | |
594 | return -EINVAL; | |
595 | ||
596 | return icd->ops->get_chip_id(icd, id); | |
597 | } | |
598 | ||
599 | #ifdef CONFIG_VIDEO_ADV_DEBUG | |
600 | static int soc_camera_g_register(struct file *file, void *fh, | |
601 | struct v4l2_register *reg) | |
602 | { | |
603 | struct soc_camera_file *icf = file->private_data; | |
604 | struct soc_camera_device *icd = icf->icd; | |
605 | ||
606 | if (!icd->ops->get_register) | |
607 | return -EINVAL; | |
608 | ||
609 | return icd->ops->get_register(icd, reg); | |
610 | } | |
611 | ||
612 | static int soc_camera_s_register(struct file *file, void *fh, | |
613 | struct v4l2_register *reg) | |
614 | { | |
615 | struct soc_camera_file *icf = file->private_data; | |
616 | struct soc_camera_device *icd = icf->icd; | |
617 | ||
618 | if (!icd->ops->set_register) | |
619 | return -EINVAL; | |
620 | ||
621 | return icd->ops->set_register(icd, reg); | |
622 | } | |
623 | #endif | |
624 | ||
625 | static int device_register_link(struct soc_camera_device *icd) | |
626 | { | |
627 | int ret = device_register(&icd->dev); | |
628 | ||
629 | if (ret < 0) { | |
630 | /* Prevent calling device_unregister() */ | |
631 | icd->dev.parent = NULL; | |
632 | dev_err(&icd->dev, "Cannot register device: %d\n", ret); | |
633 | /* Even if probe() was unsuccessful for all registered drivers, | |
634 | * device_register() returns 0, and we add the link, just to | |
635 | * document this camera's control device */ | |
636 | } else if (icd->control) | |
637 | /* Have to sysfs_remove_link() before device_unregister()? */ | |
638 | if (sysfs_create_link(&icd->dev.kobj, &icd->control->kobj, | |
639 | "control")) | |
640 | dev_warn(&icd->dev, | |
641 | "Failed creating the control symlink\n"); | |
642 | return ret; | |
643 | } | |
644 | ||
645 | /* So far this function cannot fail */ | |
646 | static void scan_add_host(struct soc_camera_host *ici) | |
647 | { | |
648 | struct soc_camera_device *icd; | |
649 | ||
650 | mutex_lock(&list_lock); | |
651 | ||
652 | list_for_each_entry(icd, &devices, list) { | |
653 | if (icd->iface == ici->nr) { | |
654 | icd->dev.parent = &ici->dev; | |
655 | device_register_link(icd); | |
656 | } | |
657 | } | |
658 | ||
659 | mutex_unlock(&list_lock); | |
660 | } | |
661 | ||
662 | /* return: 0 if no match found or a match found and | |
663 | * device_register() successful, error code otherwise */ | |
664 | static int scan_add_device(struct soc_camera_device *icd) | |
665 | { | |
666 | struct soc_camera_host *ici; | |
667 | int ret = 0; | |
668 | ||
669 | mutex_lock(&list_lock); | |
670 | ||
671 | list_add_tail(&icd->list, &devices); | |
672 | ||
673 | /* Watch out for class_for_each_device / class_find_device API by | |
674 | * Dave Young <hidave.darkstar@gmail.com> */ | |
675 | list_for_each_entry(ici, &hosts, list) { | |
676 | if (icd->iface == ici->nr) { | |
677 | ret = 1; | |
678 | icd->dev.parent = &ici->dev; | |
679 | break; | |
680 | } | |
681 | } | |
682 | ||
683 | mutex_unlock(&list_lock); | |
684 | ||
685 | if (ret) | |
686 | ret = device_register_link(icd); | |
687 | ||
688 | return ret; | |
689 | } | |
690 | ||
691 | static int soc_camera_probe(struct device *dev) | |
692 | { | |
693 | struct soc_camera_device *icd = to_soc_camera_dev(dev); | |
694 | struct soc_camera_host *ici = | |
695 | to_soc_camera_host(icd->dev.parent); | |
696 | int ret; | |
697 | ||
26f1b942 | 698 | if (!icd->ops->probe) |
e55222ef GL |
699 | return -ENODEV; |
700 | ||
9dc4e48f GL |
701 | /* We only call ->add() here to activate and probe the camera. |
702 | * We shall ->remove() and deactivate it immediately afterwards. */ | |
b8d9904c | 703 | ret = ici->ops->add(icd); |
e55222ef GL |
704 | if (ret < 0) |
705 | return ret; | |
706 | ||
26f1b942 | 707 | ret = icd->ops->probe(icd); |
9dc4e48f | 708 | if (ret >= 0) { |
e55222ef GL |
709 | const struct v4l2_queryctrl *qctrl; |
710 | ||
711 | qctrl = soc_camera_find_qctrl(icd->ops, V4L2_CID_GAIN); | |
712 | icd->gain = qctrl ? qctrl->default_value : (unsigned short)~0; | |
713 | qctrl = soc_camera_find_qctrl(icd->ops, V4L2_CID_EXPOSURE); | |
714 | icd->exposure = qctrl ? qctrl->default_value : | |
715 | (unsigned short)~0; | |
716 | } | |
b8d9904c | 717 | ici->ops->remove(icd); |
e55222ef GL |
718 | |
719 | return ret; | |
720 | } | |
721 | ||
722 | /* This is called on device_unregister, which only means we have to disconnect | |
723 | * from the host, but not remove ourselves from the device list */ | |
724 | static int soc_camera_remove(struct device *dev) | |
725 | { | |
726 | struct soc_camera_device *icd = to_soc_camera_dev(dev); | |
e55222ef | 727 | |
26f1b942 GL |
728 | if (icd->ops->remove) |
729 | icd->ops->remove(icd); | |
e55222ef | 730 | |
e55222ef GL |
731 | return 0; |
732 | } | |
733 | ||
734 | static struct bus_type soc_camera_bus_type = { | |
735 | .name = "soc-camera", | |
736 | .probe = soc_camera_probe, | |
737 | .remove = soc_camera_remove, | |
738 | }; | |
739 | ||
740 | static struct device_driver ic_drv = { | |
741 | .name = "camera", | |
742 | .bus = &soc_camera_bus_type, | |
743 | .owner = THIS_MODULE, | |
744 | }; | |
745 | ||
e55222ef GL |
746 | static void dummy_release(struct device *dev) |
747 | { | |
748 | } | |
749 | ||
b8d9904c | 750 | int soc_camera_host_register(struct soc_camera_host *ici) |
e55222ef GL |
751 | { |
752 | int ret; | |
753 | struct soc_camera_host *ix; | |
754 | ||
092d3921 | 755 | if (!ici->ops->init_videobuf || !ici->ops->add || !ici->ops->remove) |
e55222ef GL |
756 | return -EINVAL; |
757 | ||
758 | /* Number might be equal to the platform device ID */ | |
759 | sprintf(ici->dev.bus_id, "camera_host%d", ici->nr); | |
e55222ef GL |
760 | |
761 | mutex_lock(&list_lock); | |
762 | list_for_each_entry(ix, &hosts, list) { | |
763 | if (ix->nr == ici->nr) { | |
764 | mutex_unlock(&list_lock); | |
765 | return -EBUSY; | |
766 | } | |
767 | } | |
768 | ||
769 | list_add_tail(&ici->list, &hosts); | |
770 | mutex_unlock(&list_lock); | |
771 | ||
e55222ef GL |
772 | ici->dev.release = dummy_release; |
773 | ||
774 | ret = device_register(&ici->dev); | |
775 | ||
776 | if (ret) | |
777 | goto edevr; | |
778 | ||
779 | scan_add_host(ici); | |
780 | ||
781 | return 0; | |
782 | ||
783 | edevr: | |
784 | mutex_lock(&list_lock); | |
785 | list_del(&ici->list); | |
786 | mutex_unlock(&list_lock); | |
787 | ||
788 | return ret; | |
789 | } | |
790 | EXPORT_SYMBOL(soc_camera_host_register); | |
791 | ||
792 | /* Unregister all clients! */ | |
793 | void soc_camera_host_unregister(struct soc_camera_host *ici) | |
794 | { | |
795 | struct soc_camera_device *icd; | |
796 | ||
797 | mutex_lock(&list_lock); | |
798 | ||
799 | list_del(&ici->list); | |
800 | ||
801 | list_for_each_entry(icd, &devices, list) { | |
802 | if (icd->dev.parent == &ici->dev) { | |
803 | device_unregister(&icd->dev); | |
804 | /* Not before device_unregister(), .remove | |
b8d9904c | 805 | * needs parent to call ici->ops->remove() */ |
e55222ef GL |
806 | icd->dev.parent = NULL; |
807 | memset(&icd->dev.kobj, 0, sizeof(icd->dev.kobj)); | |
808 | } | |
809 | } | |
810 | ||
811 | mutex_unlock(&list_lock); | |
812 | ||
813 | device_unregister(&ici->dev); | |
814 | } | |
815 | EXPORT_SYMBOL(soc_camera_host_unregister); | |
816 | ||
817 | /* Image capture device */ | |
818 | int soc_camera_device_register(struct soc_camera_device *icd) | |
819 | { | |
820 | struct soc_camera_device *ix; | |
821 | int num = -1, i; | |
822 | ||
823 | if (!icd) | |
824 | return -EINVAL; | |
825 | ||
826 | for (i = 0; i < 256 && num < 0; i++) { | |
827 | num = i; | |
828 | list_for_each_entry(ix, &devices, list) { | |
829 | if (ix->iface == icd->iface && ix->devnum == i) { | |
830 | num = -1; | |
831 | break; | |
832 | } | |
833 | } | |
834 | } | |
835 | ||
836 | if (num < 0) | |
837 | /* ok, we have 256 cameras on this host... | |
838 | * man, stay reasonable... */ | |
839 | return -ENOMEM; | |
840 | ||
841 | icd->devnum = num; | |
842 | icd->dev.bus = &soc_camera_bus_type; | |
843 | snprintf(icd->dev.bus_id, sizeof(icd->dev.bus_id), | |
844 | "%u-%u", icd->iface, icd->devnum); | |
845 | ||
846 | icd->dev.release = dummy_release; | |
847 | ||
e55222ef GL |
848 | return scan_add_device(icd); |
849 | } | |
850 | EXPORT_SYMBOL(soc_camera_device_register); | |
851 | ||
852 | void soc_camera_device_unregister(struct soc_camera_device *icd) | |
853 | { | |
854 | mutex_lock(&list_lock); | |
855 | list_del(&icd->list); | |
856 | ||
857 | /* The bus->remove will be eventually called */ | |
858 | if (icd->dev.parent) | |
859 | device_unregister(&icd->dev); | |
860 | mutex_unlock(&list_lock); | |
861 | } | |
862 | EXPORT_SYMBOL(soc_camera_device_unregister); | |
863 | ||
864 | int soc_camera_video_start(struct soc_camera_device *icd) | |
865 | { | |
866 | struct soc_camera_host *ici = to_soc_camera_host(icd->dev.parent); | |
867 | int err = -ENOMEM; | |
868 | struct video_device *vdev; | |
869 | ||
870 | if (!icd->dev.parent) | |
871 | return -ENODEV; | |
872 | ||
873 | vdev = video_device_alloc(); | |
874 | if (!vdev) | |
875 | goto evidallocd; | |
876 | dev_dbg(&ici->dev, "Allocated video_device %p\n", vdev); | |
877 | ||
878 | strlcpy(vdev->name, ici->drv_name, sizeof(vdev->name)); | |
879 | /* Maybe better &ici->dev */ | |
880 | vdev->dev = &icd->dev; | |
881 | vdev->type = VID_TYPE_CAPTURE; | |
882 | vdev->current_norm = V4L2_STD_UNKNOWN; | |
883 | vdev->fops = &soc_camera_fops; | |
884 | vdev->release = video_device_release; | |
885 | vdev->minor = -1; | |
886 | vdev->tvnorms = V4L2_STD_UNKNOWN, | |
887 | vdev->vidioc_querycap = soc_camera_querycap; | |
72937890 HV |
888 | vdev->vidioc_g_fmt_vid_cap = soc_camera_g_fmt_vid_cap; |
889 | vdev->vidioc_enum_fmt_vid_cap = soc_camera_enum_fmt_vid_cap; | |
890 | vdev->vidioc_s_fmt_vid_cap = soc_camera_s_fmt_vid_cap; | |
e55222ef GL |
891 | vdev->vidioc_enum_input = soc_camera_enum_input; |
892 | vdev->vidioc_g_input = soc_camera_g_input; | |
893 | vdev->vidioc_s_input = soc_camera_s_input; | |
894 | vdev->vidioc_s_std = soc_camera_s_std; | |
895 | vdev->vidioc_reqbufs = soc_camera_reqbufs; | |
72937890 | 896 | vdev->vidioc_try_fmt_vid_cap = soc_camera_try_fmt_vid_cap; |
e55222ef GL |
897 | vdev->vidioc_querybuf = soc_camera_querybuf; |
898 | vdev->vidioc_qbuf = soc_camera_qbuf; | |
899 | vdev->vidioc_dqbuf = soc_camera_dqbuf; | |
900 | vdev->vidioc_streamon = soc_camera_streamon; | |
901 | vdev->vidioc_streamoff = soc_camera_streamoff; | |
902 | vdev->vidioc_queryctrl = soc_camera_queryctrl; | |
903 | vdev->vidioc_g_ctrl = soc_camera_g_ctrl; | |
904 | vdev->vidioc_s_ctrl = soc_camera_s_ctrl; | |
905 | vdev->vidioc_cropcap = soc_camera_cropcap; | |
906 | vdev->vidioc_g_crop = soc_camera_g_crop; | |
907 | vdev->vidioc_s_crop = soc_camera_s_crop; | |
908 | vdev->vidioc_g_chip_ident = soc_camera_g_chip_ident; | |
909 | #ifdef CONFIG_VIDEO_ADV_DEBUG | |
910 | vdev->vidioc_g_register = soc_camera_g_register; | |
911 | vdev->vidioc_s_register = soc_camera_s_register; | |
912 | #endif | |
913 | ||
26f1b942 | 914 | icd->current_fmt = &icd->formats[0]; |
e55222ef GL |
915 | |
916 | err = video_register_device(vdev, VFL_TYPE_GRABBER, vdev->minor); | |
917 | if (err < 0) { | |
918 | dev_err(vdev->dev, "video_register_device failed\n"); | |
919 | goto evidregd; | |
920 | } | |
921 | icd->vdev = vdev; | |
922 | ||
923 | return 0; | |
924 | ||
925 | evidregd: | |
926 | video_device_release(vdev); | |
927 | evidallocd: | |
928 | return err; | |
929 | } | |
930 | EXPORT_SYMBOL(soc_camera_video_start); | |
931 | ||
932 | void soc_camera_video_stop(struct soc_camera_device *icd) | |
933 | { | |
934 | struct video_device *vdev = icd->vdev; | |
935 | ||
7e28adb2 | 936 | dev_dbg(&icd->dev, "%s\n", __func__); |
e55222ef GL |
937 | |
938 | if (!icd->dev.parent || !vdev) | |
939 | return; | |
940 | ||
941 | mutex_lock(&video_lock); | |
942 | video_unregister_device(vdev); | |
943 | icd->vdev = NULL; | |
944 | mutex_unlock(&video_lock); | |
945 | } | |
946 | EXPORT_SYMBOL(soc_camera_video_stop); | |
947 | ||
948 | static int __init soc_camera_init(void) | |
949 | { | |
950 | int ret = bus_register(&soc_camera_bus_type); | |
951 | if (ret) | |
952 | return ret; | |
953 | ret = driver_register(&ic_drv); | |
954 | if (ret) | |
955 | goto edrvr; | |
e55222ef GL |
956 | |
957 | return 0; | |
958 | ||
e55222ef GL |
959 | edrvr: |
960 | bus_unregister(&soc_camera_bus_type); | |
961 | return ret; | |
962 | } | |
963 | ||
964 | static void __exit soc_camera_exit(void) | |
965 | { | |
e55222ef GL |
966 | driver_unregister(&ic_drv); |
967 | bus_unregister(&soc_camera_bus_type); | |
968 | } | |
969 | ||
970 | module_init(soc_camera_init); | |
971 | module_exit(soc_camera_exit); | |
972 | ||
973 | MODULE_DESCRIPTION("Image capture bus driver"); | |
974 | MODULE_AUTHOR("Guennadi Liakhovetski <kernel@pengutronix.de>"); | |
975 | MODULE_LICENSE("GPL"); |