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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 | ||
26f1b942 GL |
41 | for (i = 0; i < icd->num_formats; i++) |
42 | if (icd->formats[i].fourcc == fourcc) | |
43 | return icd->formats + i; | |
e55222ef GL |
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 | ||
ad5f2e85 | 78 | /* test physical bus parameters */ |
b8d9904c | 79 | ret = ici->ops->try_bus_param(icd, f->fmt.pix.pixelformat); |
ad5f2e85 GL |
80 | if (ret) |
81 | return ret; | |
e55222ef | 82 | |
ad5f2e85 | 83 | /* limit format to hardware capabilities */ |
b8d9904c | 84 | ret = ici->ops->try_fmt_cap(icd, f); |
e55222ef GL |
85 | |
86 | /* calculate missing fields */ | |
87 | f->fmt.pix.field = field; | |
88 | f->fmt.pix.bytesperline = | |
89 | (f->fmt.pix.width * fmt->depth) >> 3; | |
90 | f->fmt.pix.sizeimage = | |
91 | f->fmt.pix.height * f->fmt.pix.bytesperline; | |
92 | ||
93 | return ret; | |
94 | } | |
95 | ||
96 | static int soc_camera_enum_input(struct file *file, void *priv, | |
97 | struct v4l2_input *inp) | |
98 | { | |
99 | if (inp->index != 0) | |
100 | return -EINVAL; | |
101 | ||
102 | inp->type = V4L2_INPUT_TYPE_CAMERA; | |
103 | inp->std = V4L2_STD_UNKNOWN; | |
104 | strcpy(inp->name, "Camera"); | |
105 | ||
106 | return 0; | |
107 | } | |
108 | ||
109 | static int soc_camera_g_input(struct file *file, void *priv, unsigned int *i) | |
110 | { | |
111 | *i = 0; | |
112 | ||
113 | return 0; | |
114 | } | |
115 | ||
116 | static int soc_camera_s_input(struct file *file, void *priv, unsigned int i) | |
117 | { | |
118 | if (i > 0) | |
119 | return -EINVAL; | |
120 | ||
121 | return 0; | |
122 | } | |
123 | ||
124 | static int soc_camera_s_std(struct file *file, void *priv, v4l2_std_id *a) | |
125 | { | |
126 | return 0; | |
127 | } | |
128 | ||
129 | static int soc_camera_reqbufs(struct file *file, void *priv, | |
130 | struct v4l2_requestbuffers *p) | |
131 | { | |
132 | int ret; | |
133 | struct soc_camera_file *icf = file->private_data; | |
134 | struct soc_camera_device *icd = icf->icd; | |
135 | struct soc_camera_host *ici = | |
136 | to_soc_camera_host(icd->dev.parent); | |
137 | ||
138 | WARN_ON(priv != file->private_data); | |
139 | ||
140 | dev_dbg(&icd->dev, "%s: %d\n", __FUNCTION__, p->memory); | |
141 | ||
142 | ret = videobuf_reqbufs(&icf->vb_vidq, p); | |
143 | if (ret < 0) | |
144 | return ret; | |
145 | ||
b8d9904c | 146 | return ici->ops->reqbufs(icf, p); |
e55222ef GL |
147 | |
148 | return ret; | |
149 | } | |
150 | ||
151 | static int soc_camera_querybuf(struct file *file, void *priv, | |
152 | struct v4l2_buffer *p) | |
153 | { | |
154 | struct soc_camera_file *icf = file->private_data; | |
155 | ||
156 | WARN_ON(priv != file->private_data); | |
157 | ||
158 | return videobuf_querybuf(&icf->vb_vidq, p); | |
159 | } | |
160 | ||
161 | static int soc_camera_qbuf(struct file *file, void *priv, | |
162 | struct v4l2_buffer *p) | |
163 | { | |
164 | struct soc_camera_file *icf = file->private_data; | |
165 | ||
166 | WARN_ON(priv != file->private_data); | |
167 | ||
168 | return videobuf_qbuf(&icf->vb_vidq, p); | |
169 | } | |
170 | ||
171 | static int soc_camera_dqbuf(struct file *file, void *priv, | |
172 | struct v4l2_buffer *p) | |
173 | { | |
174 | struct soc_camera_file *icf = file->private_data; | |
175 | ||
176 | WARN_ON(priv != file->private_data); | |
177 | ||
178 | return videobuf_dqbuf(&icf->vb_vidq, p, file->f_flags & O_NONBLOCK); | |
179 | } | |
180 | ||
181 | static int soc_camera_open(struct inode *inode, struct file *file) | |
182 | { | |
9dc4e48f GL |
183 | struct video_device *vdev; |
184 | struct soc_camera_device *icd; | |
185 | struct soc_camera_host *ici; | |
e55222ef GL |
186 | struct soc_camera_file *icf; |
187 | int ret; | |
188 | ||
189 | icf = vmalloc(sizeof(*icf)); | |
190 | if (!icf) | |
191 | return -ENOMEM; | |
192 | ||
9dc4e48f GL |
193 | /* Protect against icd->remove() until we module_get() both drivers. */ |
194 | mutex_lock(&video_lock); | |
195 | ||
196 | vdev = video_devdata(file); | |
197 | icd = container_of(vdev->dev, struct soc_camera_device, dev); | |
198 | ici = to_soc_camera_host(icd->dev.parent); | |
e55222ef GL |
199 | |
200 | if (!try_module_get(icd->ops->owner)) { | |
201 | dev_err(&icd->dev, "Couldn't lock sensor driver.\n"); | |
202 | ret = -EINVAL; | |
203 | goto emgd; | |
204 | } | |
205 | ||
b8d9904c | 206 | if (!try_module_get(ici->ops->owner)) { |
e55222ef GL |
207 | dev_err(&icd->dev, "Couldn't lock capture bus driver.\n"); |
208 | ret = -EINVAL; | |
209 | goto emgi; | |
210 | } | |
211 | ||
9dc4e48f GL |
212 | icd->use_count++; |
213 | ||
214 | icf->icd = icd; | |
215 | ||
216 | /* Now we really have to activate the camera */ | |
217 | if (icd->use_count == 1) { | |
b8d9904c | 218 | ret = ici->ops->add(icd); |
9dc4e48f GL |
219 | if (ret < 0) { |
220 | dev_err(&icd->dev, "Couldn't activate the camera: %d\n", ret); | |
221 | icd->use_count--; | |
222 | goto eiciadd; | |
223 | } | |
224 | } | |
225 | ||
226 | mutex_unlock(&video_lock); | |
227 | ||
e55222ef GL |
228 | file->private_data = icf; |
229 | dev_dbg(&icd->dev, "camera device open\n"); | |
230 | ||
231 | /* We must pass NULL as dev pointer, then all pci_* dma operations | |
232 | * transform to normal dma_* ones. Do we need an irqlock? */ | |
0705135e | 233 | videobuf_queue_sg_init(&icf->vb_vidq, ici->vbq_ops, NULL, NULL, |
e55222ef GL |
234 | V4L2_BUF_TYPE_VIDEO_CAPTURE, V4L2_FIELD_NONE, |
235 | ici->msize, icd); | |
236 | ||
237 | return 0; | |
238 | ||
9dc4e48f GL |
239 | /* All errors are entered with the video_lock held */ |
240 | eiciadd: | |
b8d9904c | 241 | module_put(ici->ops->owner); |
e55222ef GL |
242 | emgi: |
243 | module_put(icd->ops->owner); | |
244 | emgd: | |
9dc4e48f | 245 | mutex_unlock(&video_lock); |
e55222ef GL |
246 | vfree(icf); |
247 | return ret; | |
248 | } | |
249 | ||
250 | static int soc_camera_close(struct inode *inode, struct file *file) | |
251 | { | |
252 | struct soc_camera_file *icf = file->private_data; | |
253 | struct soc_camera_device *icd = icf->icd; | |
254 | struct soc_camera_host *ici = to_soc_camera_host(icd->dev.parent); | |
255 | struct video_device *vdev = icd->vdev; | |
256 | ||
9dc4e48f GL |
257 | mutex_lock(&video_lock); |
258 | icd->use_count--; | |
259 | if (!icd->use_count) | |
b8d9904c | 260 | ici->ops->remove(icd); |
e55222ef | 261 | module_put(icd->ops->owner); |
b8d9904c | 262 | module_put(ici->ops->owner); |
9dc4e48f GL |
263 | mutex_unlock(&video_lock); |
264 | ||
e55222ef GL |
265 | vfree(file->private_data); |
266 | ||
267 | dev_dbg(vdev->dev, "camera device close\n"); | |
268 | ||
269 | return 0; | |
270 | } | |
271 | ||
aba360d8 | 272 | static ssize_t soc_camera_read(struct file *file, char __user *buf, |
e55222ef GL |
273 | size_t count, loff_t *ppos) |
274 | { | |
275 | struct soc_camera_file *icf = file->private_data; | |
276 | struct soc_camera_device *icd = icf->icd; | |
277 | struct video_device *vdev = icd->vdev; | |
278 | int err = -EINVAL; | |
279 | ||
280 | dev_err(vdev->dev, "camera device read not implemented\n"); | |
281 | ||
282 | return err; | |
283 | } | |
284 | ||
285 | static int soc_camera_mmap(struct file *file, struct vm_area_struct *vma) | |
286 | { | |
287 | struct soc_camera_file *icf = file->private_data; | |
288 | struct soc_camera_device *icd = icf->icd; | |
289 | int err; | |
290 | ||
291 | dev_dbg(&icd->dev, "mmap called, vma=0x%08lx\n", (unsigned long)vma); | |
292 | ||
293 | err = videobuf_mmap_mapper(&icf->vb_vidq, vma); | |
294 | ||
295 | dev_dbg(&icd->dev, "vma start=0x%08lx, size=%ld, ret=%d\n", | |
296 | (unsigned long)vma->vm_start, | |
297 | (unsigned long)vma->vm_end - (unsigned long)vma->vm_start, | |
298 | err); | |
299 | ||
300 | return err; | |
301 | } | |
302 | ||
303 | static unsigned int soc_camera_poll(struct file *file, poll_table *pt) | |
304 | { | |
305 | struct soc_camera_file *icf = file->private_data; | |
306 | struct soc_camera_device *icd = icf->icd; | |
307 | struct soc_camera_host *ici = | |
308 | to_soc_camera_host(icd->dev.parent); | |
309 | ||
310 | if (list_empty(&icf->vb_vidq.stream)) { | |
311 | dev_err(&icd->dev, "Trying to poll with no queued buffers!\n"); | |
312 | return POLLERR; | |
313 | } | |
314 | ||
b8d9904c | 315 | return ici->ops->poll(file, pt); |
e55222ef GL |
316 | } |
317 | ||
318 | ||
319 | static struct file_operations soc_camera_fops = { | |
320 | .owner = THIS_MODULE, | |
321 | .open = soc_camera_open, | |
322 | .release = soc_camera_close, | |
323 | .ioctl = video_ioctl2, | |
324 | .read = soc_camera_read, | |
325 | .mmap = soc_camera_mmap, | |
326 | .poll = soc_camera_poll, | |
327 | .llseek = no_llseek, | |
328 | }; | |
329 | ||
330 | ||
331 | static int soc_camera_s_fmt_cap(struct file *file, void *priv, | |
332 | struct v4l2_format *f) | |
333 | { | |
334 | struct soc_camera_file *icf = file->private_data; | |
335 | struct soc_camera_device *icd = icf->icd; | |
336 | struct soc_camera_host *ici = | |
337 | to_soc_camera_host(icd->dev.parent); | |
338 | int ret; | |
339 | struct v4l2_rect rect; | |
340 | const static struct soc_camera_data_format *data_fmt; | |
341 | ||
342 | WARN_ON(priv != file->private_data); | |
343 | ||
344 | data_fmt = format_by_fourcc(icd, f->fmt.pix.pixelformat); | |
345 | if (!data_fmt) | |
346 | return -EINVAL; | |
347 | ||
ad5f2e85 GL |
348 | /* buswidth may be further adjusted by the ici */ |
349 | icd->buswidth = data_fmt->depth; | |
e55222ef GL |
350 | |
351 | ret = soc_camera_try_fmt_cap(file, icf, f); | |
352 | if (ret < 0) | |
353 | return ret; | |
354 | ||
355 | rect.left = icd->x_current; | |
356 | rect.top = icd->y_current; | |
357 | rect.width = f->fmt.pix.width; | |
358 | rect.height = f->fmt.pix.height; | |
b8d9904c | 359 | ret = ici->ops->set_fmt_cap(icd, f->fmt.pix.pixelformat, &rect); |
ad5f2e85 GL |
360 | if (ret < 0) |
361 | return ret; | |
e55222ef | 362 | |
ad5f2e85 GL |
363 | icd->current_fmt = data_fmt; |
364 | icd->width = rect.width; | |
365 | icd->height = rect.height; | |
366 | icf->vb_vidq.field = f->fmt.pix.field; | |
367 | if (V4L2_BUF_TYPE_VIDEO_CAPTURE != f->type) | |
368 | dev_warn(&icd->dev, "Attention! Wrong buf-type %d\n", | |
369 | f->type); | |
e55222ef | 370 | |
ad5f2e85 GL |
371 | dev_dbg(&icd->dev, "set width: %d height: %d\n", |
372 | icd->width, icd->height); | |
373 | ||
374 | /* set physical bus parameters */ | |
b8d9904c | 375 | return ici->ops->set_bus_param(icd, f->fmt.pix.pixelformat); |
e55222ef GL |
376 | } |
377 | ||
378 | static int soc_camera_enum_fmt_cap(struct file *file, void *priv, | |
379 | struct v4l2_fmtdesc *f) | |
380 | { | |
381 | struct soc_camera_file *icf = file->private_data; | |
382 | struct soc_camera_device *icd = icf->icd; | |
383 | const struct soc_camera_data_format *format; | |
384 | ||
385 | WARN_ON(priv != file->private_data); | |
386 | ||
26f1b942 | 387 | if (f->index >= icd->num_formats) |
e55222ef GL |
388 | return -EINVAL; |
389 | ||
26f1b942 | 390 | format = &icd->formats[f->index]; |
e55222ef GL |
391 | |
392 | strlcpy(f->description, format->name, sizeof(f->description)); | |
393 | f->pixelformat = format->fourcc; | |
394 | return 0; | |
395 | } | |
396 | ||
397 | static int soc_camera_g_fmt_cap(struct file *file, void *priv, | |
398 | struct v4l2_format *f) | |
399 | { | |
400 | struct soc_camera_file *icf = file->private_data; | |
401 | struct soc_camera_device *icd = icf->icd; | |
402 | ||
403 | WARN_ON(priv != file->private_data); | |
404 | ||
405 | f->fmt.pix.width = icd->width; | |
406 | f->fmt.pix.height = icd->height; | |
407 | f->fmt.pix.field = icf->vb_vidq.field; | |
408 | f->fmt.pix.pixelformat = icd->current_fmt->fourcc; | |
409 | f->fmt.pix.bytesperline = | |
410 | (f->fmt.pix.width * icd->current_fmt->depth) >> 3; | |
411 | f->fmt.pix.sizeimage = | |
412 | f->fmt.pix.height * f->fmt.pix.bytesperline; | |
413 | dev_dbg(&icd->dev, "current_fmt->fourcc: 0x%08x\n", | |
414 | icd->current_fmt->fourcc); | |
415 | return 0; | |
416 | } | |
417 | ||
418 | static int soc_camera_querycap(struct file *file, void *priv, | |
419 | struct v4l2_capability *cap) | |
420 | { | |
421 | struct soc_camera_file *icf = file->private_data; | |
422 | struct soc_camera_device *icd = icf->icd; | |
423 | struct soc_camera_host *ici = | |
424 | to_soc_camera_host(icd->dev.parent); | |
425 | ||
426 | WARN_ON(priv != file->private_data); | |
427 | ||
428 | strlcpy(cap->driver, ici->drv_name, sizeof(cap->driver)); | |
b8d9904c | 429 | return ici->ops->querycap(ici, cap); |
e55222ef GL |
430 | } |
431 | ||
432 | static int soc_camera_streamon(struct file *file, void *priv, | |
433 | enum v4l2_buf_type i) | |
434 | { | |
435 | struct soc_camera_file *icf = file->private_data; | |
436 | struct soc_camera_device *icd = icf->icd; | |
437 | ||
438 | WARN_ON(priv != file->private_data); | |
439 | ||
440 | dev_dbg(&icd->dev, "%s\n", __FUNCTION__); | |
441 | ||
442 | if (i != V4L2_BUF_TYPE_VIDEO_CAPTURE) | |
443 | return -EINVAL; | |
444 | ||
445 | icd->ops->start_capture(icd); | |
446 | ||
447 | /* This calls buf_queue from host driver's videobuf_queue_ops */ | |
448 | return videobuf_streamon(&icf->vb_vidq); | |
449 | } | |
450 | ||
451 | static int soc_camera_streamoff(struct file *file, void *priv, | |
452 | enum v4l2_buf_type i) | |
453 | { | |
454 | struct soc_camera_file *icf = file->private_data; | |
455 | struct soc_camera_device *icd = icf->icd; | |
456 | ||
457 | WARN_ON(priv != file->private_data); | |
458 | ||
459 | dev_dbg(&icd->dev, "%s\n", __FUNCTION__); | |
460 | ||
461 | if (i != V4L2_BUF_TYPE_VIDEO_CAPTURE) | |
462 | return -EINVAL; | |
463 | ||
464 | /* This calls buf_release from host driver's videobuf_queue_ops for all | |
465 | * remaining buffers. When the last buffer is freed, stop capture */ | |
466 | videobuf_streamoff(&icf->vb_vidq); | |
467 | ||
468 | icd->ops->stop_capture(icd); | |
469 | ||
470 | return 0; | |
471 | } | |
472 | ||
473 | static int soc_camera_queryctrl(struct file *file, void *priv, | |
474 | struct v4l2_queryctrl *qc) | |
475 | { | |
476 | struct soc_camera_file *icf = file->private_data; | |
477 | struct soc_camera_device *icd = icf->icd; | |
478 | int i; | |
479 | ||
480 | WARN_ON(priv != file->private_data); | |
481 | ||
482 | if (!qc->id) | |
483 | return -EINVAL; | |
484 | ||
485 | for (i = 0; i < icd->ops->num_controls; i++) | |
486 | if (qc->id == icd->ops->controls[i].id) { | |
487 | memcpy(qc, &(icd->ops->controls[i]), | |
488 | sizeof(*qc)); | |
489 | return 0; | |
490 | } | |
491 | ||
492 | return -EINVAL; | |
493 | } | |
494 | ||
495 | static int soc_camera_g_ctrl(struct file *file, void *priv, | |
496 | struct v4l2_control *ctrl) | |
497 | { | |
498 | struct soc_camera_file *icf = file->private_data; | |
499 | struct soc_camera_device *icd = icf->icd; | |
500 | ||
501 | WARN_ON(priv != file->private_data); | |
502 | ||
503 | switch (ctrl->id) { | |
504 | case V4L2_CID_GAIN: | |
505 | if (icd->gain == (unsigned short)~0) | |
506 | return -EINVAL; | |
507 | ctrl->value = icd->gain; | |
508 | return 0; | |
509 | case V4L2_CID_EXPOSURE: | |
510 | if (icd->exposure == (unsigned short)~0) | |
511 | return -EINVAL; | |
512 | ctrl->value = icd->exposure; | |
513 | return 0; | |
514 | } | |
515 | ||
516 | if (icd->ops->get_control) | |
517 | return icd->ops->get_control(icd, ctrl); | |
518 | return -EINVAL; | |
519 | } | |
520 | ||
521 | static int soc_camera_s_ctrl(struct file *file, void *priv, | |
522 | struct v4l2_control *ctrl) | |
523 | { | |
524 | struct soc_camera_file *icf = file->private_data; | |
525 | struct soc_camera_device *icd = icf->icd; | |
526 | ||
527 | WARN_ON(priv != file->private_data); | |
528 | ||
529 | if (icd->ops->set_control) | |
530 | return icd->ops->set_control(icd, ctrl); | |
531 | return -EINVAL; | |
532 | } | |
533 | ||
534 | static int soc_camera_cropcap(struct file *file, void *fh, | |
535 | struct v4l2_cropcap *a) | |
536 | { | |
537 | struct soc_camera_file *icf = file->private_data; | |
538 | struct soc_camera_device *icd = icf->icd; | |
539 | ||
540 | a->type = V4L2_BUF_TYPE_VIDEO_CAPTURE; | |
541 | a->bounds.left = icd->x_min; | |
542 | a->bounds.top = icd->y_min; | |
543 | a->bounds.width = icd->width_max; | |
544 | a->bounds.height = icd->height_max; | |
545 | a->defrect.left = icd->x_min; | |
546 | a->defrect.top = icd->y_min; | |
547 | a->defrect.width = 640; | |
548 | a->defrect.height = 480; | |
549 | a->pixelaspect.numerator = 1; | |
550 | a->pixelaspect.denominator = 1; | |
551 | ||
552 | return 0; | |
553 | } | |
554 | ||
555 | static int soc_camera_g_crop(struct file *file, void *fh, | |
556 | struct v4l2_crop *a) | |
557 | { | |
558 | struct soc_camera_file *icf = file->private_data; | |
559 | struct soc_camera_device *icd = icf->icd; | |
560 | ||
561 | a->type = V4L2_BUF_TYPE_VIDEO_CAPTURE; | |
562 | a->c.left = icd->x_current; | |
563 | a->c.top = icd->y_current; | |
564 | a->c.width = icd->width; | |
565 | a->c.height = icd->height; | |
566 | ||
567 | return 0; | |
568 | } | |
569 | ||
570 | static int soc_camera_s_crop(struct file *file, void *fh, | |
571 | struct v4l2_crop *a) | |
572 | { | |
573 | struct soc_camera_file *icf = file->private_data; | |
574 | struct soc_camera_device *icd = icf->icd; | |
575 | struct soc_camera_host *ici = | |
576 | to_soc_camera_host(icd->dev.parent); | |
577 | int ret; | |
578 | ||
579 | if (a->type != V4L2_BUF_TYPE_VIDEO_CAPTURE) | |
580 | return -EINVAL; | |
581 | ||
b8d9904c | 582 | ret = ici->ops->set_fmt_cap(icd, 0, &a->c); |
e55222ef GL |
583 | if (!ret) { |
584 | icd->width = a->c.width; | |
585 | icd->height = a->c.height; | |
586 | icd->x_current = a->c.left; | |
587 | icd->y_current = a->c.top; | |
588 | } | |
589 | ||
590 | return ret; | |
591 | } | |
592 | ||
593 | static int soc_camera_g_chip_ident(struct file *file, void *fh, | |
594 | struct v4l2_chip_ident *id) | |
595 | { | |
596 | struct soc_camera_file *icf = file->private_data; | |
597 | struct soc_camera_device *icd = icf->icd; | |
598 | ||
599 | if (!icd->ops->get_chip_id) | |
600 | return -EINVAL; | |
601 | ||
602 | return icd->ops->get_chip_id(icd, id); | |
603 | } | |
604 | ||
605 | #ifdef CONFIG_VIDEO_ADV_DEBUG | |
606 | static int soc_camera_g_register(struct file *file, void *fh, | |
607 | struct v4l2_register *reg) | |
608 | { | |
609 | struct soc_camera_file *icf = file->private_data; | |
610 | struct soc_camera_device *icd = icf->icd; | |
611 | ||
612 | if (!icd->ops->get_register) | |
613 | return -EINVAL; | |
614 | ||
615 | return icd->ops->get_register(icd, reg); | |
616 | } | |
617 | ||
618 | static int soc_camera_s_register(struct file *file, void *fh, | |
619 | struct v4l2_register *reg) | |
620 | { | |
621 | struct soc_camera_file *icf = file->private_data; | |
622 | struct soc_camera_device *icd = icf->icd; | |
623 | ||
624 | if (!icd->ops->set_register) | |
625 | return -EINVAL; | |
626 | ||
627 | return icd->ops->set_register(icd, reg); | |
628 | } | |
629 | #endif | |
630 | ||
631 | static int device_register_link(struct soc_camera_device *icd) | |
632 | { | |
633 | int ret = device_register(&icd->dev); | |
634 | ||
635 | if (ret < 0) { | |
636 | /* Prevent calling device_unregister() */ | |
637 | icd->dev.parent = NULL; | |
638 | dev_err(&icd->dev, "Cannot register device: %d\n", ret); | |
639 | /* Even if probe() was unsuccessful for all registered drivers, | |
640 | * device_register() returns 0, and we add the link, just to | |
641 | * document this camera's control device */ | |
642 | } else if (icd->control) | |
643 | /* Have to sysfs_remove_link() before device_unregister()? */ | |
644 | if (sysfs_create_link(&icd->dev.kobj, &icd->control->kobj, | |
645 | "control")) | |
646 | dev_warn(&icd->dev, | |
647 | "Failed creating the control symlink\n"); | |
648 | return ret; | |
649 | } | |
650 | ||
651 | /* So far this function cannot fail */ | |
652 | static void scan_add_host(struct soc_camera_host *ici) | |
653 | { | |
654 | struct soc_camera_device *icd; | |
655 | ||
656 | mutex_lock(&list_lock); | |
657 | ||
658 | list_for_each_entry(icd, &devices, list) { | |
659 | if (icd->iface == ici->nr) { | |
660 | icd->dev.parent = &ici->dev; | |
661 | device_register_link(icd); | |
662 | } | |
663 | } | |
664 | ||
665 | mutex_unlock(&list_lock); | |
666 | } | |
667 | ||
668 | /* return: 0 if no match found or a match found and | |
669 | * device_register() successful, error code otherwise */ | |
670 | static int scan_add_device(struct soc_camera_device *icd) | |
671 | { | |
672 | struct soc_camera_host *ici; | |
673 | int ret = 0; | |
674 | ||
675 | mutex_lock(&list_lock); | |
676 | ||
677 | list_add_tail(&icd->list, &devices); | |
678 | ||
679 | /* Watch out for class_for_each_device / class_find_device API by | |
680 | * Dave Young <hidave.darkstar@gmail.com> */ | |
681 | list_for_each_entry(ici, &hosts, list) { | |
682 | if (icd->iface == ici->nr) { | |
683 | ret = 1; | |
684 | icd->dev.parent = &ici->dev; | |
685 | break; | |
686 | } | |
687 | } | |
688 | ||
689 | mutex_unlock(&list_lock); | |
690 | ||
691 | if (ret) | |
692 | ret = device_register_link(icd); | |
693 | ||
694 | return ret; | |
695 | } | |
696 | ||
697 | static int soc_camera_probe(struct device *dev) | |
698 | { | |
699 | struct soc_camera_device *icd = to_soc_camera_dev(dev); | |
700 | struct soc_camera_host *ici = | |
701 | to_soc_camera_host(icd->dev.parent); | |
702 | int ret; | |
703 | ||
26f1b942 | 704 | if (!icd->ops->probe) |
e55222ef GL |
705 | return -ENODEV; |
706 | ||
9dc4e48f GL |
707 | /* We only call ->add() here to activate and probe the camera. |
708 | * We shall ->remove() and deactivate it immediately afterwards. */ | |
b8d9904c | 709 | ret = ici->ops->add(icd); |
e55222ef GL |
710 | if (ret < 0) |
711 | return ret; | |
712 | ||
26f1b942 | 713 | ret = icd->ops->probe(icd); |
9dc4e48f | 714 | if (ret >= 0) { |
e55222ef GL |
715 | const struct v4l2_queryctrl *qctrl; |
716 | ||
717 | qctrl = soc_camera_find_qctrl(icd->ops, V4L2_CID_GAIN); | |
718 | icd->gain = qctrl ? qctrl->default_value : (unsigned short)~0; | |
719 | qctrl = soc_camera_find_qctrl(icd->ops, V4L2_CID_EXPOSURE); | |
720 | icd->exposure = qctrl ? qctrl->default_value : | |
721 | (unsigned short)~0; | |
722 | } | |
b8d9904c | 723 | ici->ops->remove(icd); |
e55222ef GL |
724 | |
725 | return ret; | |
726 | } | |
727 | ||
728 | /* This is called on device_unregister, which only means we have to disconnect | |
729 | * from the host, but not remove ourselves from the device list */ | |
730 | static int soc_camera_remove(struct device *dev) | |
731 | { | |
732 | struct soc_camera_device *icd = to_soc_camera_dev(dev); | |
e55222ef | 733 | |
26f1b942 GL |
734 | if (icd->ops->remove) |
735 | icd->ops->remove(icd); | |
e55222ef | 736 | |
e55222ef GL |
737 | return 0; |
738 | } | |
739 | ||
740 | static struct bus_type soc_camera_bus_type = { | |
741 | .name = "soc-camera", | |
742 | .probe = soc_camera_probe, | |
743 | .remove = soc_camera_remove, | |
744 | }; | |
745 | ||
746 | static struct device_driver ic_drv = { | |
747 | .name = "camera", | |
748 | .bus = &soc_camera_bus_type, | |
749 | .owner = THIS_MODULE, | |
750 | }; | |
751 | ||
752 | /* | |
753 | * Image capture host - this is a host device, not a bus device, so, | |
754 | * no bus reference, no probing. | |
755 | */ | |
756 | static struct class soc_camera_host_class = { | |
757 | .owner = THIS_MODULE, | |
758 | .name = "camera_host", | |
759 | }; | |
760 | ||
761 | static void dummy_release(struct device *dev) | |
762 | { | |
763 | } | |
764 | ||
b8d9904c | 765 | int soc_camera_host_register(struct soc_camera_host *ici) |
e55222ef GL |
766 | { |
767 | int ret; | |
768 | struct soc_camera_host *ix; | |
769 | ||
b8d9904c | 770 | if (!ici->vbq_ops || !ici->ops->add || !ici->ops->remove) |
e55222ef GL |
771 | return -EINVAL; |
772 | ||
773 | /* Number might be equal to the platform device ID */ | |
774 | sprintf(ici->dev.bus_id, "camera_host%d", ici->nr); | |
775 | ici->dev.class = &soc_camera_host_class; | |
776 | ||
777 | mutex_lock(&list_lock); | |
778 | list_for_each_entry(ix, &hosts, list) { | |
779 | if (ix->nr == ici->nr) { | |
780 | mutex_unlock(&list_lock); | |
781 | return -EBUSY; | |
782 | } | |
783 | } | |
784 | ||
785 | list_add_tail(&ici->list, &hosts); | |
786 | mutex_unlock(&list_lock); | |
787 | ||
e55222ef GL |
788 | ici->dev.release = dummy_release; |
789 | ||
790 | ret = device_register(&ici->dev); | |
791 | ||
792 | if (ret) | |
793 | goto edevr; | |
794 | ||
795 | scan_add_host(ici); | |
796 | ||
797 | return 0; | |
798 | ||
799 | edevr: | |
800 | mutex_lock(&list_lock); | |
801 | list_del(&ici->list); | |
802 | mutex_unlock(&list_lock); | |
803 | ||
804 | return ret; | |
805 | } | |
806 | EXPORT_SYMBOL(soc_camera_host_register); | |
807 | ||
808 | /* Unregister all clients! */ | |
809 | void soc_camera_host_unregister(struct soc_camera_host *ici) | |
810 | { | |
811 | struct soc_camera_device *icd; | |
812 | ||
813 | mutex_lock(&list_lock); | |
814 | ||
815 | list_del(&ici->list); | |
816 | ||
817 | list_for_each_entry(icd, &devices, list) { | |
818 | if (icd->dev.parent == &ici->dev) { | |
819 | device_unregister(&icd->dev); | |
820 | /* Not before device_unregister(), .remove | |
b8d9904c | 821 | * needs parent to call ici->ops->remove() */ |
e55222ef GL |
822 | icd->dev.parent = NULL; |
823 | memset(&icd->dev.kobj, 0, sizeof(icd->dev.kobj)); | |
824 | } | |
825 | } | |
826 | ||
827 | mutex_unlock(&list_lock); | |
828 | ||
829 | device_unregister(&ici->dev); | |
830 | } | |
831 | EXPORT_SYMBOL(soc_camera_host_unregister); | |
832 | ||
833 | /* Image capture device */ | |
834 | int soc_camera_device_register(struct soc_camera_device *icd) | |
835 | { | |
836 | struct soc_camera_device *ix; | |
837 | int num = -1, i; | |
838 | ||
839 | if (!icd) | |
840 | return -EINVAL; | |
841 | ||
842 | for (i = 0; i < 256 && num < 0; i++) { | |
843 | num = i; | |
844 | list_for_each_entry(ix, &devices, list) { | |
845 | if (ix->iface == icd->iface && ix->devnum == i) { | |
846 | num = -1; | |
847 | break; | |
848 | } | |
849 | } | |
850 | } | |
851 | ||
852 | if (num < 0) | |
853 | /* ok, we have 256 cameras on this host... | |
854 | * man, stay reasonable... */ | |
855 | return -ENOMEM; | |
856 | ||
857 | icd->devnum = num; | |
858 | icd->dev.bus = &soc_camera_bus_type; | |
859 | snprintf(icd->dev.bus_id, sizeof(icd->dev.bus_id), | |
860 | "%u-%u", icd->iface, icd->devnum); | |
861 | ||
862 | icd->dev.release = dummy_release; | |
863 | ||
e55222ef GL |
864 | return scan_add_device(icd); |
865 | } | |
866 | EXPORT_SYMBOL(soc_camera_device_register); | |
867 | ||
868 | void soc_camera_device_unregister(struct soc_camera_device *icd) | |
869 | { | |
870 | mutex_lock(&list_lock); | |
871 | list_del(&icd->list); | |
872 | ||
873 | /* The bus->remove will be eventually called */ | |
874 | if (icd->dev.parent) | |
875 | device_unregister(&icd->dev); | |
876 | mutex_unlock(&list_lock); | |
877 | } | |
878 | EXPORT_SYMBOL(soc_camera_device_unregister); | |
879 | ||
880 | int soc_camera_video_start(struct soc_camera_device *icd) | |
881 | { | |
882 | struct soc_camera_host *ici = to_soc_camera_host(icd->dev.parent); | |
883 | int err = -ENOMEM; | |
884 | struct video_device *vdev; | |
885 | ||
886 | if (!icd->dev.parent) | |
887 | return -ENODEV; | |
888 | ||
889 | vdev = video_device_alloc(); | |
890 | if (!vdev) | |
891 | goto evidallocd; | |
892 | dev_dbg(&ici->dev, "Allocated video_device %p\n", vdev); | |
893 | ||
894 | strlcpy(vdev->name, ici->drv_name, sizeof(vdev->name)); | |
895 | /* Maybe better &ici->dev */ | |
896 | vdev->dev = &icd->dev; | |
897 | vdev->type = VID_TYPE_CAPTURE; | |
898 | vdev->current_norm = V4L2_STD_UNKNOWN; | |
899 | vdev->fops = &soc_camera_fops; | |
900 | vdev->release = video_device_release; | |
901 | vdev->minor = -1; | |
902 | vdev->tvnorms = V4L2_STD_UNKNOWN, | |
903 | vdev->vidioc_querycap = soc_camera_querycap; | |
904 | vdev->vidioc_g_fmt_cap = soc_camera_g_fmt_cap; | |
905 | vdev->vidioc_enum_fmt_cap = soc_camera_enum_fmt_cap; | |
906 | vdev->vidioc_s_fmt_cap = soc_camera_s_fmt_cap; | |
907 | vdev->vidioc_enum_input = soc_camera_enum_input; | |
908 | vdev->vidioc_g_input = soc_camera_g_input; | |
909 | vdev->vidioc_s_input = soc_camera_s_input; | |
910 | vdev->vidioc_s_std = soc_camera_s_std; | |
911 | vdev->vidioc_reqbufs = soc_camera_reqbufs; | |
912 | vdev->vidioc_try_fmt_cap = soc_camera_try_fmt_cap; | |
913 | vdev->vidioc_querybuf = soc_camera_querybuf; | |
914 | vdev->vidioc_qbuf = soc_camera_qbuf; | |
915 | vdev->vidioc_dqbuf = soc_camera_dqbuf; | |
916 | vdev->vidioc_streamon = soc_camera_streamon; | |
917 | vdev->vidioc_streamoff = soc_camera_streamoff; | |
918 | vdev->vidioc_queryctrl = soc_camera_queryctrl; | |
919 | vdev->vidioc_g_ctrl = soc_camera_g_ctrl; | |
920 | vdev->vidioc_s_ctrl = soc_camera_s_ctrl; | |
921 | vdev->vidioc_cropcap = soc_camera_cropcap; | |
922 | vdev->vidioc_g_crop = soc_camera_g_crop; | |
923 | vdev->vidioc_s_crop = soc_camera_s_crop; | |
924 | vdev->vidioc_g_chip_ident = soc_camera_g_chip_ident; | |
925 | #ifdef CONFIG_VIDEO_ADV_DEBUG | |
926 | vdev->vidioc_g_register = soc_camera_g_register; | |
927 | vdev->vidioc_s_register = soc_camera_s_register; | |
928 | #endif | |
929 | ||
26f1b942 | 930 | icd->current_fmt = &icd->formats[0]; |
e55222ef GL |
931 | |
932 | err = video_register_device(vdev, VFL_TYPE_GRABBER, vdev->minor); | |
933 | if (err < 0) { | |
934 | dev_err(vdev->dev, "video_register_device failed\n"); | |
935 | goto evidregd; | |
936 | } | |
937 | icd->vdev = vdev; | |
938 | ||
939 | return 0; | |
940 | ||
941 | evidregd: | |
942 | video_device_release(vdev); | |
943 | evidallocd: | |
944 | return err; | |
945 | } | |
946 | EXPORT_SYMBOL(soc_camera_video_start); | |
947 | ||
948 | void soc_camera_video_stop(struct soc_camera_device *icd) | |
949 | { | |
950 | struct video_device *vdev = icd->vdev; | |
951 | ||
952 | dev_dbg(&icd->dev, "%s\n", __FUNCTION__); | |
953 | ||
954 | if (!icd->dev.parent || !vdev) | |
955 | return; | |
956 | ||
957 | mutex_lock(&video_lock); | |
958 | video_unregister_device(vdev); | |
959 | icd->vdev = NULL; | |
960 | mutex_unlock(&video_lock); | |
961 | } | |
962 | EXPORT_SYMBOL(soc_camera_video_stop); | |
963 | ||
964 | static int __init soc_camera_init(void) | |
965 | { | |
966 | int ret = bus_register(&soc_camera_bus_type); | |
967 | if (ret) | |
968 | return ret; | |
969 | ret = driver_register(&ic_drv); | |
970 | if (ret) | |
971 | goto edrvr; | |
972 | ret = class_register(&soc_camera_host_class); | |
973 | if (ret) | |
974 | goto eclr; | |
975 | ||
976 | return 0; | |
977 | ||
978 | eclr: | |
979 | driver_unregister(&ic_drv); | |
980 | edrvr: | |
981 | bus_unregister(&soc_camera_bus_type); | |
982 | return ret; | |
983 | } | |
984 | ||
985 | static void __exit soc_camera_exit(void) | |
986 | { | |
987 | class_unregister(&soc_camera_host_class); | |
988 | driver_unregister(&ic_drv); | |
989 | bus_unregister(&soc_camera_bus_type); | |
990 | } | |
991 | ||
992 | module_init(soc_camera_init); | |
993 | module_exit(soc_camera_exit); | |
994 | ||
995 | MODULE_DESCRIPTION("Image capture bus driver"); | |
996 | MODULE_AUTHOR("Guennadi Liakhovetski <kernel@pengutronix.de>"); | |
997 | MODULE_LICENSE("GPL"); |