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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> | |
29 | #include <media/soc_camera.h> | |
30 | ||
31 | static LIST_HEAD(hosts); | |
32 | static LIST_HEAD(devices); | |
33 | static DEFINE_MUTEX(list_lock); | |
34 | static DEFINE_MUTEX(video_lock); | |
35 | ||
36 | const static struct soc_camera_data_format* | |
37 | format_by_fourcc(struct soc_camera_device *icd, unsigned int fourcc) | |
38 | { | |
39 | unsigned int i; | |
40 | ||
41 | for (i = 0; i < icd->ops->num_formats; i++) | |
42 | if (icd->ops->formats[i].fourcc == fourcc) | |
43 | return icd->ops->formats + i; | |
44 | return NULL; | |
45 | } | |
46 | ||
47 | static int soc_camera_try_fmt_cap(struct file *file, void *priv, | |
48 | struct v4l2_format *f) | |
49 | { | |
50 | struct soc_camera_file *icf = file->private_data; | |
51 | struct soc_camera_device *icd = icf->icd; | |
52 | struct soc_camera_host *ici = | |
53 | to_soc_camera_host(icd->dev.parent); | |
54 | enum v4l2_field field; | |
55 | const struct soc_camera_data_format *fmt; | |
56 | int ret; | |
57 | ||
58 | WARN_ON(priv != file->private_data); | |
59 | ||
60 | fmt = format_by_fourcc(icd, f->fmt.pix.pixelformat); | |
61 | if (!fmt) { | |
62 | dev_dbg(&icd->dev, "invalid format 0x%08x\n", | |
63 | f->fmt.pix.pixelformat); | |
64 | return -EINVAL; | |
65 | } | |
66 | ||
67 | dev_dbg(&icd->dev, "fmt: 0x%08x\n", fmt->fourcc); | |
68 | ||
69 | field = f->fmt.pix.field; | |
70 | ||
71 | if (field == V4L2_FIELD_ANY) { | |
72 | field = V4L2_FIELD_NONE; | |
73 | } else if (V4L2_FIELD_NONE != field) { | |
74 | dev_err(&icd->dev, "Field type invalid.\n"); | |
75 | return -EINVAL; | |
76 | } | |
77 | ||
78 | /* limit to host capabilities */ | |
79 | ret = ici->try_fmt_cap(ici, f); | |
80 | ||
81 | /* limit to sensor capabilities */ | |
82 | if (!ret) | |
83 | ret = icd->ops->try_fmt_cap(icd, f); | |
84 | ||
85 | /* calculate missing fields */ | |
86 | f->fmt.pix.field = field; | |
87 | f->fmt.pix.bytesperline = | |
88 | (f->fmt.pix.width * fmt->depth) >> 3; | |
89 | f->fmt.pix.sizeimage = | |
90 | f->fmt.pix.height * f->fmt.pix.bytesperline; | |
91 | ||
92 | return ret; | |
93 | } | |
94 | ||
95 | static int soc_camera_enum_input(struct file *file, void *priv, | |
96 | struct v4l2_input *inp) | |
97 | { | |
98 | if (inp->index != 0) | |
99 | return -EINVAL; | |
100 | ||
101 | inp->type = V4L2_INPUT_TYPE_CAMERA; | |
102 | inp->std = V4L2_STD_UNKNOWN; | |
103 | strcpy(inp->name, "Camera"); | |
104 | ||
105 | return 0; | |
106 | } | |
107 | ||
108 | static int soc_camera_g_input(struct file *file, void *priv, unsigned int *i) | |
109 | { | |
110 | *i = 0; | |
111 | ||
112 | return 0; | |
113 | } | |
114 | ||
115 | static int soc_camera_s_input(struct file *file, void *priv, unsigned int i) | |
116 | { | |
117 | if (i > 0) | |
118 | return -EINVAL; | |
119 | ||
120 | return 0; | |
121 | } | |
122 | ||
123 | static int soc_camera_s_std(struct file *file, void *priv, v4l2_std_id *a) | |
124 | { | |
125 | return 0; | |
126 | } | |
127 | ||
128 | static int soc_camera_reqbufs(struct file *file, void *priv, | |
129 | struct v4l2_requestbuffers *p) | |
130 | { | |
131 | int ret; | |
132 | struct soc_camera_file *icf = file->private_data; | |
133 | struct soc_camera_device *icd = icf->icd; | |
134 | struct soc_camera_host *ici = | |
135 | to_soc_camera_host(icd->dev.parent); | |
136 | ||
137 | WARN_ON(priv != file->private_data); | |
138 | ||
139 | dev_dbg(&icd->dev, "%s: %d\n", __FUNCTION__, p->memory); | |
140 | ||
141 | ret = videobuf_reqbufs(&icf->vb_vidq, p); | |
142 | if (ret < 0) | |
143 | return ret; | |
144 | ||
145 | return ici->reqbufs(icf, p); | |
146 | ||
147 | return ret; | |
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 | { | |
182 | struct video_device *vdev = video_devdata(file); | |
183 | struct soc_camera_device *icd = container_of(vdev->dev, | |
184 | struct soc_camera_device, dev); | |
185 | struct soc_camera_host *ici = | |
186 | to_soc_camera_host(icd->dev.parent); | |
187 | struct soc_camera_file *icf; | |
188 | int ret; | |
189 | ||
190 | icf = vmalloc(sizeof(*icf)); | |
191 | if (!icf) | |
192 | return -ENOMEM; | |
193 | ||
194 | icf->icd = icd; | |
195 | ||
196 | if (!try_module_get(icd->ops->owner)) { | |
197 | dev_err(&icd->dev, "Couldn't lock sensor driver.\n"); | |
198 | ret = -EINVAL; | |
199 | goto emgd; | |
200 | } | |
201 | ||
202 | if (!try_module_get(ici->owner)) { | |
203 | dev_err(&icd->dev, "Couldn't lock capture bus driver.\n"); | |
204 | ret = -EINVAL; | |
205 | goto emgi; | |
206 | } | |
207 | ||
208 | file->private_data = icf; | |
209 | dev_dbg(&icd->dev, "camera device open\n"); | |
210 | ||
211 | /* We must pass NULL as dev pointer, then all pci_* dma operations | |
212 | * transform to normal dma_* ones. Do we need an irqlock? */ | |
0705135e | 213 | videobuf_queue_sg_init(&icf->vb_vidq, ici->vbq_ops, NULL, NULL, |
e55222ef GL |
214 | V4L2_BUF_TYPE_VIDEO_CAPTURE, V4L2_FIELD_NONE, |
215 | ici->msize, icd); | |
216 | ||
217 | return 0; | |
218 | ||
219 | emgi: | |
220 | module_put(icd->ops->owner); | |
221 | emgd: | |
222 | vfree(icf); | |
223 | return ret; | |
224 | } | |
225 | ||
226 | static int soc_camera_close(struct inode *inode, struct file *file) | |
227 | { | |
228 | struct soc_camera_file *icf = file->private_data; | |
229 | struct soc_camera_device *icd = icf->icd; | |
230 | struct soc_camera_host *ici = to_soc_camera_host(icd->dev.parent); | |
231 | struct video_device *vdev = icd->vdev; | |
232 | ||
233 | module_put(icd->ops->owner); | |
234 | module_put(ici->owner); | |
235 | vfree(file->private_data); | |
236 | ||
237 | dev_dbg(vdev->dev, "camera device close\n"); | |
238 | ||
239 | return 0; | |
240 | } | |
241 | ||
242 | static int soc_camera_read(struct file *file, char __user *buf, | |
243 | size_t count, loff_t *ppos) | |
244 | { | |
245 | struct soc_camera_file *icf = file->private_data; | |
246 | struct soc_camera_device *icd = icf->icd; | |
247 | struct video_device *vdev = icd->vdev; | |
248 | int err = -EINVAL; | |
249 | ||
250 | dev_err(vdev->dev, "camera device read not implemented\n"); | |
251 | ||
252 | return err; | |
253 | } | |
254 | ||
255 | static int soc_camera_mmap(struct file *file, struct vm_area_struct *vma) | |
256 | { | |
257 | struct soc_camera_file *icf = file->private_data; | |
258 | struct soc_camera_device *icd = icf->icd; | |
259 | int err; | |
260 | ||
261 | dev_dbg(&icd->dev, "mmap called, vma=0x%08lx\n", (unsigned long)vma); | |
262 | ||
263 | err = videobuf_mmap_mapper(&icf->vb_vidq, vma); | |
264 | ||
265 | dev_dbg(&icd->dev, "vma start=0x%08lx, size=%ld, ret=%d\n", | |
266 | (unsigned long)vma->vm_start, | |
267 | (unsigned long)vma->vm_end - (unsigned long)vma->vm_start, | |
268 | err); | |
269 | ||
270 | return err; | |
271 | } | |
272 | ||
273 | static unsigned int soc_camera_poll(struct file *file, poll_table *pt) | |
274 | { | |
275 | struct soc_camera_file *icf = file->private_data; | |
276 | struct soc_camera_device *icd = icf->icd; | |
277 | struct soc_camera_host *ici = | |
278 | to_soc_camera_host(icd->dev.parent); | |
279 | ||
280 | if (list_empty(&icf->vb_vidq.stream)) { | |
281 | dev_err(&icd->dev, "Trying to poll with no queued buffers!\n"); | |
282 | return POLLERR; | |
283 | } | |
284 | ||
285 | return ici->poll(file, pt); | |
286 | } | |
287 | ||
288 | ||
289 | static struct file_operations soc_camera_fops = { | |
290 | .owner = THIS_MODULE, | |
291 | .open = soc_camera_open, | |
292 | .release = soc_camera_close, | |
293 | .ioctl = video_ioctl2, | |
294 | .read = soc_camera_read, | |
295 | .mmap = soc_camera_mmap, | |
296 | .poll = soc_camera_poll, | |
297 | .llseek = no_llseek, | |
298 | }; | |
299 | ||
300 | ||
301 | static int soc_camera_s_fmt_cap(struct file *file, void *priv, | |
302 | struct v4l2_format *f) | |
303 | { | |
304 | struct soc_camera_file *icf = file->private_data; | |
305 | struct soc_camera_device *icd = icf->icd; | |
306 | struct soc_camera_host *ici = | |
307 | to_soc_camera_host(icd->dev.parent); | |
308 | int ret; | |
309 | struct v4l2_rect rect; | |
310 | const static struct soc_camera_data_format *data_fmt; | |
311 | ||
312 | WARN_ON(priv != file->private_data); | |
313 | ||
314 | data_fmt = format_by_fourcc(icd, f->fmt.pix.pixelformat); | |
315 | if (!data_fmt) | |
316 | return -EINVAL; | |
317 | ||
318 | /* cached_datawidth may be further adjusted by the ici */ | |
319 | icd->cached_datawidth = data_fmt->depth; | |
320 | ||
321 | ret = soc_camera_try_fmt_cap(file, icf, f); | |
322 | if (ret < 0) | |
323 | return ret; | |
324 | ||
325 | rect.left = icd->x_current; | |
326 | rect.top = icd->y_current; | |
327 | rect.width = f->fmt.pix.width; | |
328 | rect.height = f->fmt.pix.height; | |
329 | ret = ici->set_capture_format(icd, f->fmt.pix.pixelformat, &rect); | |
330 | ||
331 | if (!ret) { | |
332 | icd->current_fmt = data_fmt; | |
333 | icd->width = rect.width; | |
334 | icd->height = rect.height; | |
335 | icf->vb_vidq.field = f->fmt.pix.field; | |
336 | if (V4L2_BUF_TYPE_VIDEO_CAPTURE != f->type) | |
337 | dev_warn(&icd->dev, "Attention! Wrong buf-type %d\n", | |
338 | f->type); | |
339 | ||
340 | dev_dbg(&icd->dev, "set width: %d height: %d\n", | |
341 | icd->width, icd->height); | |
342 | } | |
343 | ||
344 | return ret; | |
345 | } | |
346 | ||
347 | static int soc_camera_enum_fmt_cap(struct file *file, void *priv, | |
348 | struct v4l2_fmtdesc *f) | |
349 | { | |
350 | struct soc_camera_file *icf = file->private_data; | |
351 | struct soc_camera_device *icd = icf->icd; | |
352 | const struct soc_camera_data_format *format; | |
353 | ||
354 | WARN_ON(priv != file->private_data); | |
355 | ||
356 | if (f->index >= icd->ops->num_formats) | |
357 | return -EINVAL; | |
358 | ||
359 | format = &icd->ops->formats[f->index]; | |
360 | ||
361 | strlcpy(f->description, format->name, sizeof(f->description)); | |
362 | f->pixelformat = format->fourcc; | |
363 | return 0; | |
364 | } | |
365 | ||
366 | static int soc_camera_g_fmt_cap(struct file *file, void *priv, | |
367 | struct v4l2_format *f) | |
368 | { | |
369 | struct soc_camera_file *icf = file->private_data; | |
370 | struct soc_camera_device *icd = icf->icd; | |
371 | ||
372 | WARN_ON(priv != file->private_data); | |
373 | ||
374 | f->fmt.pix.width = icd->width; | |
375 | f->fmt.pix.height = icd->height; | |
376 | f->fmt.pix.field = icf->vb_vidq.field; | |
377 | f->fmt.pix.pixelformat = icd->current_fmt->fourcc; | |
378 | f->fmt.pix.bytesperline = | |
379 | (f->fmt.pix.width * icd->current_fmt->depth) >> 3; | |
380 | f->fmt.pix.sizeimage = | |
381 | f->fmt.pix.height * f->fmt.pix.bytesperline; | |
382 | dev_dbg(&icd->dev, "current_fmt->fourcc: 0x%08x\n", | |
383 | icd->current_fmt->fourcc); | |
384 | return 0; | |
385 | } | |
386 | ||
387 | static int soc_camera_querycap(struct file *file, void *priv, | |
388 | struct v4l2_capability *cap) | |
389 | { | |
390 | struct soc_camera_file *icf = file->private_data; | |
391 | struct soc_camera_device *icd = icf->icd; | |
392 | struct soc_camera_host *ici = | |
393 | to_soc_camera_host(icd->dev.parent); | |
394 | ||
395 | WARN_ON(priv != file->private_data); | |
396 | ||
397 | strlcpy(cap->driver, ici->drv_name, sizeof(cap->driver)); | |
398 | return ici->querycap(ici, cap); | |
399 | } | |
400 | ||
401 | static int soc_camera_streamon(struct file *file, void *priv, | |
402 | enum v4l2_buf_type i) | |
403 | { | |
404 | struct soc_camera_file *icf = file->private_data; | |
405 | struct soc_camera_device *icd = icf->icd; | |
406 | ||
407 | WARN_ON(priv != file->private_data); | |
408 | ||
409 | dev_dbg(&icd->dev, "%s\n", __FUNCTION__); | |
410 | ||
411 | if (i != V4L2_BUF_TYPE_VIDEO_CAPTURE) | |
412 | return -EINVAL; | |
413 | ||
414 | icd->ops->start_capture(icd); | |
415 | ||
416 | /* This calls buf_queue from host driver's videobuf_queue_ops */ | |
417 | return videobuf_streamon(&icf->vb_vidq); | |
418 | } | |
419 | ||
420 | static int soc_camera_streamoff(struct file *file, void *priv, | |
421 | enum v4l2_buf_type i) | |
422 | { | |
423 | struct soc_camera_file *icf = file->private_data; | |
424 | struct soc_camera_device *icd = icf->icd; | |
425 | ||
426 | WARN_ON(priv != file->private_data); | |
427 | ||
428 | dev_dbg(&icd->dev, "%s\n", __FUNCTION__); | |
429 | ||
430 | if (i != V4L2_BUF_TYPE_VIDEO_CAPTURE) | |
431 | return -EINVAL; | |
432 | ||
433 | /* This calls buf_release from host driver's videobuf_queue_ops for all | |
434 | * remaining buffers. When the last buffer is freed, stop capture */ | |
435 | videobuf_streamoff(&icf->vb_vidq); | |
436 | ||
437 | icd->ops->stop_capture(icd); | |
438 | ||
439 | return 0; | |
440 | } | |
441 | ||
442 | static int soc_camera_queryctrl(struct file *file, void *priv, | |
443 | struct v4l2_queryctrl *qc) | |
444 | { | |
445 | struct soc_camera_file *icf = file->private_data; | |
446 | struct soc_camera_device *icd = icf->icd; | |
447 | int i; | |
448 | ||
449 | WARN_ON(priv != file->private_data); | |
450 | ||
451 | if (!qc->id) | |
452 | return -EINVAL; | |
453 | ||
454 | for (i = 0; i < icd->ops->num_controls; i++) | |
455 | if (qc->id == icd->ops->controls[i].id) { | |
456 | memcpy(qc, &(icd->ops->controls[i]), | |
457 | sizeof(*qc)); | |
458 | return 0; | |
459 | } | |
460 | ||
461 | return -EINVAL; | |
462 | } | |
463 | ||
464 | static int soc_camera_g_ctrl(struct file *file, void *priv, | |
465 | struct v4l2_control *ctrl) | |
466 | { | |
467 | struct soc_camera_file *icf = file->private_data; | |
468 | struct soc_camera_device *icd = icf->icd; | |
469 | ||
470 | WARN_ON(priv != file->private_data); | |
471 | ||
472 | switch (ctrl->id) { | |
473 | case V4L2_CID_GAIN: | |
474 | if (icd->gain == (unsigned short)~0) | |
475 | return -EINVAL; | |
476 | ctrl->value = icd->gain; | |
477 | return 0; | |
478 | case V4L2_CID_EXPOSURE: | |
479 | if (icd->exposure == (unsigned short)~0) | |
480 | return -EINVAL; | |
481 | ctrl->value = icd->exposure; | |
482 | return 0; | |
483 | } | |
484 | ||
485 | if (icd->ops->get_control) | |
486 | return icd->ops->get_control(icd, ctrl); | |
487 | return -EINVAL; | |
488 | } | |
489 | ||
490 | static int soc_camera_s_ctrl(struct file *file, void *priv, | |
491 | struct v4l2_control *ctrl) | |
492 | { | |
493 | struct soc_camera_file *icf = file->private_data; | |
494 | struct soc_camera_device *icd = icf->icd; | |
495 | ||
496 | WARN_ON(priv != file->private_data); | |
497 | ||
498 | if (icd->ops->set_control) | |
499 | return icd->ops->set_control(icd, ctrl); | |
500 | return -EINVAL; | |
501 | } | |
502 | ||
503 | static int soc_camera_cropcap(struct file *file, void *fh, | |
504 | struct v4l2_cropcap *a) | |
505 | { | |
506 | struct soc_camera_file *icf = file->private_data; | |
507 | struct soc_camera_device *icd = icf->icd; | |
508 | ||
509 | a->type = V4L2_BUF_TYPE_VIDEO_CAPTURE; | |
510 | a->bounds.left = icd->x_min; | |
511 | a->bounds.top = icd->y_min; | |
512 | a->bounds.width = icd->width_max; | |
513 | a->bounds.height = icd->height_max; | |
514 | a->defrect.left = icd->x_min; | |
515 | a->defrect.top = icd->y_min; | |
516 | a->defrect.width = 640; | |
517 | a->defrect.height = 480; | |
518 | a->pixelaspect.numerator = 1; | |
519 | a->pixelaspect.denominator = 1; | |
520 | ||
521 | return 0; | |
522 | } | |
523 | ||
524 | static int soc_camera_g_crop(struct file *file, void *fh, | |
525 | struct v4l2_crop *a) | |
526 | { | |
527 | struct soc_camera_file *icf = file->private_data; | |
528 | struct soc_camera_device *icd = icf->icd; | |
529 | ||
530 | a->type = V4L2_BUF_TYPE_VIDEO_CAPTURE; | |
531 | a->c.left = icd->x_current; | |
532 | a->c.top = icd->y_current; | |
533 | a->c.width = icd->width; | |
534 | a->c.height = icd->height; | |
535 | ||
536 | return 0; | |
537 | } | |
538 | ||
539 | static int soc_camera_s_crop(struct file *file, void *fh, | |
540 | struct v4l2_crop *a) | |
541 | { | |
542 | struct soc_camera_file *icf = file->private_data; | |
543 | struct soc_camera_device *icd = icf->icd; | |
544 | struct soc_camera_host *ici = | |
545 | to_soc_camera_host(icd->dev.parent); | |
546 | int ret; | |
547 | ||
548 | if (a->type != V4L2_BUF_TYPE_VIDEO_CAPTURE) | |
549 | return -EINVAL; | |
550 | ||
551 | ret = ici->set_capture_format(icd, 0, &a->c); | |
552 | if (!ret) { | |
553 | icd->width = a->c.width; | |
554 | icd->height = a->c.height; | |
555 | icd->x_current = a->c.left; | |
556 | icd->y_current = a->c.top; | |
557 | } | |
558 | ||
559 | return ret; | |
560 | } | |
561 | ||
562 | static int soc_camera_g_chip_ident(struct file *file, void *fh, | |
563 | struct v4l2_chip_ident *id) | |
564 | { | |
565 | struct soc_camera_file *icf = file->private_data; | |
566 | struct soc_camera_device *icd = icf->icd; | |
567 | ||
568 | if (!icd->ops->get_chip_id) | |
569 | return -EINVAL; | |
570 | ||
571 | return icd->ops->get_chip_id(icd, id); | |
572 | } | |
573 | ||
574 | #ifdef CONFIG_VIDEO_ADV_DEBUG | |
575 | static int soc_camera_g_register(struct file *file, void *fh, | |
576 | struct v4l2_register *reg) | |
577 | { | |
578 | struct soc_camera_file *icf = file->private_data; | |
579 | struct soc_camera_device *icd = icf->icd; | |
580 | ||
581 | if (!icd->ops->get_register) | |
582 | return -EINVAL; | |
583 | ||
584 | return icd->ops->get_register(icd, reg); | |
585 | } | |
586 | ||
587 | static int soc_camera_s_register(struct file *file, void *fh, | |
588 | struct v4l2_register *reg) | |
589 | { | |
590 | struct soc_camera_file *icf = file->private_data; | |
591 | struct soc_camera_device *icd = icf->icd; | |
592 | ||
593 | if (!icd->ops->set_register) | |
594 | return -EINVAL; | |
595 | ||
596 | return icd->ops->set_register(icd, reg); | |
597 | } | |
598 | #endif | |
599 | ||
600 | static int device_register_link(struct soc_camera_device *icd) | |
601 | { | |
602 | int ret = device_register(&icd->dev); | |
603 | ||
604 | if (ret < 0) { | |
605 | /* Prevent calling device_unregister() */ | |
606 | icd->dev.parent = NULL; | |
607 | dev_err(&icd->dev, "Cannot register device: %d\n", ret); | |
608 | /* Even if probe() was unsuccessful for all registered drivers, | |
609 | * device_register() returns 0, and we add the link, just to | |
610 | * document this camera's control device */ | |
611 | } else if (icd->control) | |
612 | /* Have to sysfs_remove_link() before device_unregister()? */ | |
613 | if (sysfs_create_link(&icd->dev.kobj, &icd->control->kobj, | |
614 | "control")) | |
615 | dev_warn(&icd->dev, | |
616 | "Failed creating the control symlink\n"); | |
617 | return ret; | |
618 | } | |
619 | ||
620 | /* So far this function cannot fail */ | |
621 | static void scan_add_host(struct soc_camera_host *ici) | |
622 | { | |
623 | struct soc_camera_device *icd; | |
624 | ||
625 | mutex_lock(&list_lock); | |
626 | ||
627 | list_for_each_entry(icd, &devices, list) { | |
628 | if (icd->iface == ici->nr) { | |
629 | icd->dev.parent = &ici->dev; | |
630 | device_register_link(icd); | |
631 | } | |
632 | } | |
633 | ||
634 | mutex_unlock(&list_lock); | |
635 | } | |
636 | ||
637 | /* return: 0 if no match found or a match found and | |
638 | * device_register() successful, error code otherwise */ | |
639 | static int scan_add_device(struct soc_camera_device *icd) | |
640 | { | |
641 | struct soc_camera_host *ici; | |
642 | int ret = 0; | |
643 | ||
644 | mutex_lock(&list_lock); | |
645 | ||
646 | list_add_tail(&icd->list, &devices); | |
647 | ||
648 | /* Watch out for class_for_each_device / class_find_device API by | |
649 | * Dave Young <hidave.darkstar@gmail.com> */ | |
650 | list_for_each_entry(ici, &hosts, list) { | |
651 | if (icd->iface == ici->nr) { | |
652 | ret = 1; | |
653 | icd->dev.parent = &ici->dev; | |
654 | break; | |
655 | } | |
656 | } | |
657 | ||
658 | mutex_unlock(&list_lock); | |
659 | ||
660 | if (ret) | |
661 | ret = device_register_link(icd); | |
662 | ||
663 | return ret; | |
664 | } | |
665 | ||
666 | static int soc_camera_probe(struct device *dev) | |
667 | { | |
668 | struct soc_camera_device *icd = to_soc_camera_dev(dev); | |
669 | struct soc_camera_host *ici = | |
670 | to_soc_camera_host(icd->dev.parent); | |
671 | int ret; | |
672 | ||
673 | if (!icd->probe) | |
674 | return -ENODEV; | |
675 | ||
676 | ret = ici->add(icd); | |
677 | if (ret < 0) | |
678 | return ret; | |
679 | ||
680 | ret = icd->probe(icd); | |
681 | if (ret < 0) | |
682 | ici->remove(icd); | |
683 | else { | |
684 | const struct v4l2_queryctrl *qctrl; | |
685 | ||
686 | qctrl = soc_camera_find_qctrl(icd->ops, V4L2_CID_GAIN); | |
687 | icd->gain = qctrl ? qctrl->default_value : (unsigned short)~0; | |
688 | qctrl = soc_camera_find_qctrl(icd->ops, V4L2_CID_EXPOSURE); | |
689 | icd->exposure = qctrl ? qctrl->default_value : | |
690 | (unsigned short)~0; | |
691 | } | |
692 | ||
693 | return ret; | |
694 | } | |
695 | ||
696 | /* This is called on device_unregister, which only means we have to disconnect | |
697 | * from the host, but not remove ourselves from the device list */ | |
698 | static int soc_camera_remove(struct device *dev) | |
699 | { | |
700 | struct soc_camera_device *icd = to_soc_camera_dev(dev); | |
701 | struct soc_camera_host *ici = | |
702 | to_soc_camera_host(icd->dev.parent); | |
703 | ||
704 | if (icd->remove) | |
705 | icd->remove(icd); | |
706 | ||
707 | ici->remove(icd); | |
708 | ||
709 | return 0; | |
710 | } | |
711 | ||
712 | static struct bus_type soc_camera_bus_type = { | |
713 | .name = "soc-camera", | |
714 | .probe = soc_camera_probe, | |
715 | .remove = soc_camera_remove, | |
716 | }; | |
717 | ||
718 | static struct device_driver ic_drv = { | |
719 | .name = "camera", | |
720 | .bus = &soc_camera_bus_type, | |
721 | .owner = THIS_MODULE, | |
722 | }; | |
723 | ||
724 | /* | |
725 | * Image capture host - this is a host device, not a bus device, so, | |
726 | * no bus reference, no probing. | |
727 | */ | |
728 | static struct class soc_camera_host_class = { | |
729 | .owner = THIS_MODULE, | |
730 | .name = "camera_host", | |
731 | }; | |
732 | ||
733 | static void dummy_release(struct device *dev) | |
734 | { | |
735 | } | |
736 | ||
737 | int soc_camera_host_register(struct soc_camera_host *ici, struct module *owner) | |
738 | { | |
739 | int ret; | |
740 | struct soc_camera_host *ix; | |
741 | ||
742 | if (!ici->vbq_ops || !ici->add || !ici->remove || !owner) | |
743 | return -EINVAL; | |
744 | ||
745 | /* Number might be equal to the platform device ID */ | |
746 | sprintf(ici->dev.bus_id, "camera_host%d", ici->nr); | |
747 | ici->dev.class = &soc_camera_host_class; | |
748 | ||
749 | mutex_lock(&list_lock); | |
750 | list_for_each_entry(ix, &hosts, list) { | |
751 | if (ix->nr == ici->nr) { | |
752 | mutex_unlock(&list_lock); | |
753 | return -EBUSY; | |
754 | } | |
755 | } | |
756 | ||
757 | list_add_tail(&ici->list, &hosts); | |
758 | mutex_unlock(&list_lock); | |
759 | ||
760 | ici->owner = owner; | |
761 | ici->dev.release = dummy_release; | |
762 | ||
763 | ret = device_register(&ici->dev); | |
764 | ||
765 | if (ret) | |
766 | goto edevr; | |
767 | ||
768 | scan_add_host(ici); | |
769 | ||
770 | return 0; | |
771 | ||
772 | edevr: | |
773 | mutex_lock(&list_lock); | |
774 | list_del(&ici->list); | |
775 | mutex_unlock(&list_lock); | |
776 | ||
777 | return ret; | |
778 | } | |
779 | EXPORT_SYMBOL(soc_camera_host_register); | |
780 | ||
781 | /* Unregister all clients! */ | |
782 | void soc_camera_host_unregister(struct soc_camera_host *ici) | |
783 | { | |
784 | struct soc_camera_device *icd; | |
785 | ||
786 | mutex_lock(&list_lock); | |
787 | ||
788 | list_del(&ici->list); | |
789 | ||
790 | list_for_each_entry(icd, &devices, list) { | |
791 | if (icd->dev.parent == &ici->dev) { | |
792 | device_unregister(&icd->dev); | |
793 | /* Not before device_unregister(), .remove | |
794 | * needs parent to call ici->remove() */ | |
795 | icd->dev.parent = NULL; | |
796 | memset(&icd->dev.kobj, 0, sizeof(icd->dev.kobj)); | |
797 | } | |
798 | } | |
799 | ||
800 | mutex_unlock(&list_lock); | |
801 | ||
802 | device_unregister(&ici->dev); | |
803 | } | |
804 | EXPORT_SYMBOL(soc_camera_host_unregister); | |
805 | ||
806 | /* Image capture device */ | |
807 | int soc_camera_device_register(struct soc_camera_device *icd) | |
808 | { | |
809 | struct soc_camera_device *ix; | |
810 | int num = -1, i; | |
811 | ||
812 | if (!icd) | |
813 | return -EINVAL; | |
814 | ||
815 | for (i = 0; i < 256 && num < 0; i++) { | |
816 | num = i; | |
817 | list_for_each_entry(ix, &devices, list) { | |
818 | if (ix->iface == icd->iface && ix->devnum == i) { | |
819 | num = -1; | |
820 | break; | |
821 | } | |
822 | } | |
823 | } | |
824 | ||
825 | if (num < 0) | |
826 | /* ok, we have 256 cameras on this host... | |
827 | * man, stay reasonable... */ | |
828 | return -ENOMEM; | |
829 | ||
830 | icd->devnum = num; | |
831 | icd->dev.bus = &soc_camera_bus_type; | |
832 | snprintf(icd->dev.bus_id, sizeof(icd->dev.bus_id), | |
833 | "%u-%u", icd->iface, icd->devnum); | |
834 | ||
835 | icd->dev.release = dummy_release; | |
836 | ||
837 | if (icd->ops->get_datawidth) | |
838 | icd->cached_datawidth = icd->ops->get_datawidth(icd); | |
839 | ||
840 | return scan_add_device(icd); | |
841 | } | |
842 | EXPORT_SYMBOL(soc_camera_device_register); | |
843 | ||
844 | void soc_camera_device_unregister(struct soc_camera_device *icd) | |
845 | { | |
846 | mutex_lock(&list_lock); | |
847 | list_del(&icd->list); | |
848 | ||
849 | /* The bus->remove will be eventually called */ | |
850 | if (icd->dev.parent) | |
851 | device_unregister(&icd->dev); | |
852 | mutex_unlock(&list_lock); | |
853 | } | |
854 | EXPORT_SYMBOL(soc_camera_device_unregister); | |
855 | ||
856 | int soc_camera_video_start(struct soc_camera_device *icd) | |
857 | { | |
858 | struct soc_camera_host *ici = to_soc_camera_host(icd->dev.parent); | |
859 | int err = -ENOMEM; | |
860 | struct video_device *vdev; | |
861 | ||
862 | if (!icd->dev.parent) | |
863 | return -ENODEV; | |
864 | ||
865 | vdev = video_device_alloc(); | |
866 | if (!vdev) | |
867 | goto evidallocd; | |
868 | dev_dbg(&ici->dev, "Allocated video_device %p\n", vdev); | |
869 | ||
870 | strlcpy(vdev->name, ici->drv_name, sizeof(vdev->name)); | |
871 | /* Maybe better &ici->dev */ | |
872 | vdev->dev = &icd->dev; | |
873 | vdev->type = VID_TYPE_CAPTURE; | |
874 | vdev->current_norm = V4L2_STD_UNKNOWN; | |
875 | vdev->fops = &soc_camera_fops; | |
876 | vdev->release = video_device_release; | |
877 | vdev->minor = -1; | |
878 | vdev->tvnorms = V4L2_STD_UNKNOWN, | |
879 | vdev->vidioc_querycap = soc_camera_querycap; | |
880 | vdev->vidioc_g_fmt_cap = soc_camera_g_fmt_cap; | |
881 | vdev->vidioc_enum_fmt_cap = soc_camera_enum_fmt_cap; | |
882 | vdev->vidioc_s_fmt_cap = soc_camera_s_fmt_cap; | |
883 | vdev->vidioc_enum_input = soc_camera_enum_input; | |
884 | vdev->vidioc_g_input = soc_camera_g_input; | |
885 | vdev->vidioc_s_input = soc_camera_s_input; | |
886 | vdev->vidioc_s_std = soc_camera_s_std; | |
887 | vdev->vidioc_reqbufs = soc_camera_reqbufs; | |
888 | vdev->vidioc_try_fmt_cap = soc_camera_try_fmt_cap; | |
889 | vdev->vidioc_querybuf = soc_camera_querybuf; | |
890 | vdev->vidioc_qbuf = soc_camera_qbuf; | |
891 | vdev->vidioc_dqbuf = soc_camera_dqbuf; | |
892 | vdev->vidioc_streamon = soc_camera_streamon; | |
893 | vdev->vidioc_streamoff = soc_camera_streamoff; | |
894 | vdev->vidioc_queryctrl = soc_camera_queryctrl; | |
895 | vdev->vidioc_g_ctrl = soc_camera_g_ctrl; | |
896 | vdev->vidioc_s_ctrl = soc_camera_s_ctrl; | |
897 | vdev->vidioc_cropcap = soc_camera_cropcap; | |
898 | vdev->vidioc_g_crop = soc_camera_g_crop; | |
899 | vdev->vidioc_s_crop = soc_camera_s_crop; | |
900 | vdev->vidioc_g_chip_ident = soc_camera_g_chip_ident; | |
901 | #ifdef CONFIG_VIDEO_ADV_DEBUG | |
902 | vdev->vidioc_g_register = soc_camera_g_register; | |
903 | vdev->vidioc_s_register = soc_camera_s_register; | |
904 | #endif | |
905 | ||
906 | icd->current_fmt = &icd->ops->formats[0]; | |
907 | ||
908 | err = video_register_device(vdev, VFL_TYPE_GRABBER, vdev->minor); | |
909 | if (err < 0) { | |
910 | dev_err(vdev->dev, "video_register_device failed\n"); | |
911 | goto evidregd; | |
912 | } | |
913 | icd->vdev = vdev; | |
914 | ||
915 | return 0; | |
916 | ||
917 | evidregd: | |
918 | video_device_release(vdev); | |
919 | evidallocd: | |
920 | return err; | |
921 | } | |
922 | EXPORT_SYMBOL(soc_camera_video_start); | |
923 | ||
924 | void soc_camera_video_stop(struct soc_camera_device *icd) | |
925 | { | |
926 | struct video_device *vdev = icd->vdev; | |
927 | ||
928 | dev_dbg(&icd->dev, "%s\n", __FUNCTION__); | |
929 | ||
930 | if (!icd->dev.parent || !vdev) | |
931 | return; | |
932 | ||
933 | mutex_lock(&video_lock); | |
934 | video_unregister_device(vdev); | |
935 | icd->vdev = NULL; | |
936 | mutex_unlock(&video_lock); | |
937 | } | |
938 | EXPORT_SYMBOL(soc_camera_video_stop); | |
939 | ||
940 | static int __init soc_camera_init(void) | |
941 | { | |
942 | int ret = bus_register(&soc_camera_bus_type); | |
943 | if (ret) | |
944 | return ret; | |
945 | ret = driver_register(&ic_drv); | |
946 | if (ret) | |
947 | goto edrvr; | |
948 | ret = class_register(&soc_camera_host_class); | |
949 | if (ret) | |
950 | goto eclr; | |
951 | ||
952 | return 0; | |
953 | ||
954 | eclr: | |
955 | driver_unregister(&ic_drv); | |
956 | edrvr: | |
957 | bus_unregister(&soc_camera_bus_type); | |
958 | return ret; | |
959 | } | |
960 | ||
961 | static void __exit soc_camera_exit(void) | |
962 | { | |
963 | class_unregister(&soc_camera_host_class); | |
964 | driver_unregister(&ic_drv); | |
965 | bus_unregister(&soc_camera_bus_type); | |
966 | } | |
967 | ||
968 | module_init(soc_camera_init); | |
969 | module_exit(soc_camera_exit); | |
970 | ||
971 | MODULE_DESCRIPTION("Image capture bus driver"); | |
972 | MODULE_AUTHOR("Guennadi Liakhovetski <kernel@pengutronix.de>"); | |
973 | MODULE_LICENSE("GPL"); |