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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> | |
35ea11ff | 28 | #include <media/v4l2-ioctl.h> |
e55222ef | 29 | #include <media/v4l2-dev.h> |
092d3921 | 30 | #include <media/videobuf-core.h> |
e55222ef GL |
31 | #include <media/soc_camera.h> |
32 | ||
33 | static LIST_HEAD(hosts); | |
34 | static LIST_HEAD(devices); | |
35 | static DEFINE_MUTEX(list_lock); | |
36 | static DEFINE_MUTEX(video_lock); | |
37 | ||
25c4d74e | 38 | const struct soc_camera_data_format *soc_camera_format_by_fourcc( |
abe4c471 | 39 | struct soc_camera_device *icd, unsigned int fourcc) |
e55222ef GL |
40 | { |
41 | unsigned int i; | |
42 | ||
26f1b942 GL |
43 | for (i = 0; i < icd->num_formats; i++) |
44 | if (icd->formats[i].fourcc == fourcc) | |
45 | return icd->formats + i; | |
e55222ef GL |
46 | return NULL; |
47 | } | |
25c4d74e | 48 | EXPORT_SYMBOL(soc_camera_format_by_fourcc); |
e55222ef | 49 | |
72937890 | 50 | static int soc_camera_try_fmt_vid_cap(struct file *file, void *priv, |
abe4c471 | 51 | struct v4l2_format *f) |
e55222ef GL |
52 | { |
53 | struct soc_camera_file *icf = file->private_data; | |
54 | struct soc_camera_device *icd = icf->icd; | |
55 | struct soc_camera_host *ici = | |
56 | to_soc_camera_host(icd->dev.parent); | |
57 | enum v4l2_field field; | |
e55222ef GL |
58 | int ret; |
59 | ||
60 | WARN_ON(priv != file->private_data); | |
61 | ||
25c4d74e GL |
62 | /* |
63 | * TODO: this might also have to migrate to host-drivers, if anyone | |
64 | * wishes to support other fields | |
65 | */ | |
e55222ef GL |
66 | field = f->fmt.pix.field; |
67 | ||
68 | if (field == V4L2_FIELD_ANY) { | |
25c4d74e GL |
69 | f->fmt.pix.field = V4L2_FIELD_NONE; |
70 | } else if (field != V4L2_FIELD_NONE) { | |
e55222ef GL |
71 | dev_err(&icd->dev, "Field type invalid.\n"); |
72 | return -EINVAL; | |
73 | } | |
74 | ||
ad5f2e85 | 75 | /* limit format to hardware capabilities */ |
d8fac217 | 76 | ret = ici->ops->try_fmt(icd, f); |
e55222ef | 77 | |
e55222ef GL |
78 | return ret; |
79 | } | |
80 | ||
81 | static int soc_camera_enum_input(struct file *file, void *priv, | |
82 | struct v4l2_input *inp) | |
83 | { | |
84 | if (inp->index != 0) | |
85 | return -EINVAL; | |
86 | ||
87 | inp->type = V4L2_INPUT_TYPE_CAMERA; | |
88 | inp->std = V4L2_STD_UNKNOWN; | |
89 | strcpy(inp->name, "Camera"); | |
90 | ||
91 | return 0; | |
92 | } | |
93 | ||
94 | static int soc_camera_g_input(struct file *file, void *priv, unsigned int *i) | |
95 | { | |
96 | *i = 0; | |
97 | ||
98 | return 0; | |
99 | } | |
100 | ||
101 | static int soc_camera_s_input(struct file *file, void *priv, unsigned int i) | |
102 | { | |
103 | if (i > 0) | |
104 | return -EINVAL; | |
105 | ||
106 | return 0; | |
107 | } | |
108 | ||
109 | static int soc_camera_s_std(struct file *file, void *priv, v4l2_std_id *a) | |
110 | { | |
111 | return 0; | |
112 | } | |
113 | ||
114 | static int soc_camera_reqbufs(struct file *file, void *priv, | |
115 | struct v4l2_requestbuffers *p) | |
116 | { | |
117 | int ret; | |
118 | struct soc_camera_file *icf = file->private_data; | |
119 | struct soc_camera_device *icd = icf->icd; | |
120 | struct soc_camera_host *ici = | |
121 | to_soc_camera_host(icd->dev.parent); | |
122 | ||
123 | WARN_ON(priv != file->private_data); | |
124 | ||
7e28adb2 | 125 | dev_dbg(&icd->dev, "%s: %d\n", __func__, p->memory); |
e55222ef GL |
126 | |
127 | ret = videobuf_reqbufs(&icf->vb_vidq, p); | |
128 | if (ret < 0) | |
129 | return ret; | |
130 | ||
b8d9904c | 131 | return ici->ops->reqbufs(icf, p); |
e55222ef GL |
132 | } |
133 | ||
134 | static int soc_camera_querybuf(struct file *file, void *priv, | |
135 | struct v4l2_buffer *p) | |
136 | { | |
137 | struct soc_camera_file *icf = file->private_data; | |
138 | ||
139 | WARN_ON(priv != file->private_data); | |
140 | ||
141 | return videobuf_querybuf(&icf->vb_vidq, p); | |
142 | } | |
143 | ||
144 | static int soc_camera_qbuf(struct file *file, void *priv, | |
145 | struct v4l2_buffer *p) | |
146 | { | |
147 | struct soc_camera_file *icf = file->private_data; | |
148 | ||
149 | WARN_ON(priv != file->private_data); | |
150 | ||
151 | return videobuf_qbuf(&icf->vb_vidq, p); | |
152 | } | |
153 | ||
154 | static int soc_camera_dqbuf(struct file *file, void *priv, | |
155 | struct v4l2_buffer *p) | |
156 | { | |
157 | struct soc_camera_file *icf = file->private_data; | |
158 | ||
159 | WARN_ON(priv != file->private_data); | |
160 | ||
161 | return videobuf_dqbuf(&icf->vb_vidq, p, file->f_flags & O_NONBLOCK); | |
162 | } | |
163 | ||
164 | static int soc_camera_open(struct inode *inode, struct file *file) | |
165 | { | |
9dc4e48f GL |
166 | struct video_device *vdev; |
167 | struct soc_camera_device *icd; | |
168 | struct soc_camera_host *ici; | |
e55222ef GL |
169 | struct soc_camera_file *icf; |
170 | int ret; | |
171 | ||
172 | icf = vmalloc(sizeof(*icf)); | |
173 | if (!icf) | |
174 | return -ENOMEM; | |
175 | ||
9dc4e48f GL |
176 | /* Protect against icd->remove() until we module_get() both drivers. */ |
177 | mutex_lock(&video_lock); | |
178 | ||
179 | vdev = video_devdata(file); | |
5e85e732 | 180 | icd = container_of(vdev->parent, struct soc_camera_device, dev); |
9dc4e48f | 181 | ici = to_soc_camera_host(icd->dev.parent); |
e55222ef GL |
182 | |
183 | if (!try_module_get(icd->ops->owner)) { | |
184 | dev_err(&icd->dev, "Couldn't lock sensor driver.\n"); | |
185 | ret = -EINVAL; | |
186 | goto emgd; | |
187 | } | |
188 | ||
b8d9904c | 189 | if (!try_module_get(ici->ops->owner)) { |
e55222ef GL |
190 | dev_err(&icd->dev, "Couldn't lock capture bus driver.\n"); |
191 | ret = -EINVAL; | |
192 | goto emgi; | |
193 | } | |
194 | ||
9dc4e48f | 195 | icf->icd = icd; |
1a0063a9 GL |
196 | icd->use_count++; |
197 | ||
9dc4e48f GL |
198 | /* Now we really have to activate the camera */ |
199 | if (icd->use_count == 1) { | |
b8d9904c | 200 | ret = ici->ops->add(icd); |
9dc4e48f GL |
201 | if (ret < 0) { |
202 | dev_err(&icd->dev, "Couldn't activate the camera: %d\n", ret); | |
203 | icd->use_count--; | |
204 | goto eiciadd; | |
205 | } | |
206 | } | |
207 | ||
208 | mutex_unlock(&video_lock); | |
209 | ||
e55222ef GL |
210 | file->private_data = icf; |
211 | dev_dbg(&icd->dev, "camera device open\n"); | |
212 | ||
a034d1b7 | 213 | ici->ops->init_videobuf(&icf->vb_vidq, icd); |
e55222ef GL |
214 | |
215 | return 0; | |
216 | ||
9dc4e48f GL |
217 | /* All errors are entered with the video_lock held */ |
218 | eiciadd: | |
b8d9904c | 219 | module_put(ici->ops->owner); |
e55222ef GL |
220 | emgi: |
221 | module_put(icd->ops->owner); | |
222 | emgd: | |
9dc4e48f | 223 | mutex_unlock(&video_lock); |
e55222ef GL |
224 | vfree(icf); |
225 | return ret; | |
226 | } | |
227 | ||
228 | static int soc_camera_close(struct inode *inode, struct file *file) | |
229 | { | |
230 | struct soc_camera_file *icf = file->private_data; | |
231 | struct soc_camera_device *icd = icf->icd; | |
232 | struct soc_camera_host *ici = to_soc_camera_host(icd->dev.parent); | |
233 | struct video_device *vdev = icd->vdev; | |
234 | ||
9dc4e48f GL |
235 | mutex_lock(&video_lock); |
236 | icd->use_count--; | |
237 | if (!icd->use_count) | |
b8d9904c | 238 | ici->ops->remove(icd); |
e55222ef | 239 | module_put(icd->ops->owner); |
b8d9904c | 240 | module_put(ici->ops->owner); |
9dc4e48f GL |
241 | mutex_unlock(&video_lock); |
242 | ||
1a0063a9 | 243 | vfree(icf); |
e55222ef | 244 | |
5e85e732 | 245 | dev_dbg(vdev->parent, "camera device close\n"); |
e55222ef GL |
246 | |
247 | return 0; | |
248 | } | |
249 | ||
aba360d8 | 250 | static ssize_t soc_camera_read(struct file *file, char __user *buf, |
abe4c471 | 251 | size_t count, loff_t *ppos) |
e55222ef GL |
252 | { |
253 | struct soc_camera_file *icf = file->private_data; | |
254 | struct soc_camera_device *icd = icf->icd; | |
255 | struct video_device *vdev = icd->vdev; | |
256 | int err = -EINVAL; | |
257 | ||
5e85e732 | 258 | dev_err(vdev->parent, "camera device read not implemented\n"); |
e55222ef GL |
259 | |
260 | return err; | |
261 | } | |
262 | ||
263 | static int soc_camera_mmap(struct file *file, struct vm_area_struct *vma) | |
264 | { | |
265 | struct soc_camera_file *icf = file->private_data; | |
266 | struct soc_camera_device *icd = icf->icd; | |
267 | int err; | |
268 | ||
269 | dev_dbg(&icd->dev, "mmap called, vma=0x%08lx\n", (unsigned long)vma); | |
270 | ||
271 | err = videobuf_mmap_mapper(&icf->vb_vidq, vma); | |
272 | ||
273 | dev_dbg(&icd->dev, "vma start=0x%08lx, size=%ld, ret=%d\n", | |
274 | (unsigned long)vma->vm_start, | |
275 | (unsigned long)vma->vm_end - (unsigned long)vma->vm_start, | |
276 | err); | |
277 | ||
278 | return err; | |
279 | } | |
280 | ||
281 | static unsigned int soc_camera_poll(struct file *file, poll_table *pt) | |
282 | { | |
283 | struct soc_camera_file *icf = file->private_data; | |
284 | struct soc_camera_device *icd = icf->icd; | |
285 | struct soc_camera_host *ici = | |
286 | to_soc_camera_host(icd->dev.parent); | |
287 | ||
288 | if (list_empty(&icf->vb_vidq.stream)) { | |
289 | dev_err(&icd->dev, "Trying to poll with no queued buffers!\n"); | |
290 | return POLLERR; | |
291 | } | |
292 | ||
b8d9904c | 293 | return ici->ops->poll(file, pt); |
e55222ef GL |
294 | } |
295 | ||
e55222ef GL |
296 | static struct file_operations soc_camera_fops = { |
297 | .owner = THIS_MODULE, | |
298 | .open = soc_camera_open, | |
299 | .release = soc_camera_close, | |
300 | .ioctl = video_ioctl2, | |
301 | .read = soc_camera_read, | |
302 | .mmap = soc_camera_mmap, | |
303 | .poll = soc_camera_poll, | |
304 | .llseek = no_llseek, | |
305 | }; | |
306 | ||
72937890 | 307 | static int soc_camera_s_fmt_vid_cap(struct file *file, void *priv, |
abe4c471 | 308 | struct v4l2_format *f) |
e55222ef GL |
309 | { |
310 | struct soc_camera_file *icf = file->private_data; | |
311 | struct soc_camera_device *icd = icf->icd; | |
312 | struct soc_camera_host *ici = | |
313 | to_soc_camera_host(icd->dev.parent); | |
314 | int ret; | |
315 | struct v4l2_rect rect; | |
e55222ef GL |
316 | |
317 | WARN_ON(priv != file->private_data); | |
318 | ||
25c4d74e | 319 | ret = soc_camera_try_fmt_vid_cap(file, priv, f); |
e55222ef GL |
320 | if (ret < 0) |
321 | return ret; | |
322 | ||
323 | rect.left = icd->x_current; | |
324 | rect.top = icd->y_current; | |
325 | rect.width = f->fmt.pix.width; | |
326 | rect.height = f->fmt.pix.height; | |
d8fac217 | 327 | ret = ici->ops->set_fmt(icd, f->fmt.pix.pixelformat, &rect); |
25c4d74e | 328 | if (ret < 0) { |
ad5f2e85 | 329 | return ret; |
25c4d74e GL |
330 | } else if (!icd->current_fmt || |
331 | icd->current_fmt->fourcc != f->fmt.pix.pixelformat) { | |
332 | dev_err(&ici->dev, "Host driver hasn't set up current " | |
333 | "format correctly!\n"); | |
334 | return -EINVAL; | |
335 | } | |
e55222ef | 336 | |
25c4d74e GL |
337 | /* buswidth may be further adjusted by the ici */ |
338 | icd->buswidth = icd->current_fmt->depth; | |
ad5f2e85 GL |
339 | icd->width = rect.width; |
340 | icd->height = rect.height; | |
341 | icf->vb_vidq.field = f->fmt.pix.field; | |
25c4d74e | 342 | if (f->type != V4L2_BUF_TYPE_VIDEO_CAPTURE) |
ad5f2e85 GL |
343 | dev_warn(&icd->dev, "Attention! Wrong buf-type %d\n", |
344 | f->type); | |
e55222ef | 345 | |
ad5f2e85 GL |
346 | dev_dbg(&icd->dev, "set width: %d height: %d\n", |
347 | icd->width, icd->height); | |
348 | ||
349 | /* set physical bus parameters */ | |
b8d9904c | 350 | return ici->ops->set_bus_param(icd, f->fmt.pix.pixelformat); |
e55222ef GL |
351 | } |
352 | ||
72937890 | 353 | static int soc_camera_enum_fmt_vid_cap(struct file *file, void *priv, |
abe4c471 | 354 | struct v4l2_fmtdesc *f) |
e55222ef GL |
355 | { |
356 | struct soc_camera_file *icf = file->private_data; | |
357 | struct soc_camera_device *icd = icf->icd; | |
358 | const struct soc_camera_data_format *format; | |
359 | ||
360 | WARN_ON(priv != file->private_data); | |
361 | ||
26f1b942 | 362 | if (f->index >= icd->num_formats) |
e55222ef GL |
363 | return -EINVAL; |
364 | ||
26f1b942 | 365 | format = &icd->formats[f->index]; |
e55222ef GL |
366 | |
367 | strlcpy(f->description, format->name, sizeof(f->description)); | |
368 | f->pixelformat = format->fourcc; | |
369 | return 0; | |
370 | } | |
371 | ||
72937890 | 372 | static int soc_camera_g_fmt_vid_cap(struct file *file, void *priv, |
abe4c471 | 373 | struct v4l2_format *f) |
e55222ef GL |
374 | { |
375 | struct soc_camera_file *icf = file->private_data; | |
376 | struct soc_camera_device *icd = icf->icd; | |
377 | ||
378 | WARN_ON(priv != file->private_data); | |
379 | ||
380 | f->fmt.pix.width = icd->width; | |
381 | f->fmt.pix.height = icd->height; | |
382 | f->fmt.pix.field = icf->vb_vidq.field; | |
383 | f->fmt.pix.pixelformat = icd->current_fmt->fourcc; | |
25c4d74e GL |
384 | f->fmt.pix.bytesperline = f->fmt.pix.width * |
385 | DIV_ROUND_UP(icd->current_fmt->depth, 8); | |
386 | f->fmt.pix.sizeimage = f->fmt.pix.height * f->fmt.pix.bytesperline; | |
e55222ef GL |
387 | dev_dbg(&icd->dev, "current_fmt->fourcc: 0x%08x\n", |
388 | icd->current_fmt->fourcc); | |
389 | return 0; | |
390 | } | |
391 | ||
392 | static int soc_camera_querycap(struct file *file, void *priv, | |
393 | struct v4l2_capability *cap) | |
394 | { | |
395 | struct soc_camera_file *icf = file->private_data; | |
396 | struct soc_camera_device *icd = icf->icd; | |
397 | struct soc_camera_host *ici = | |
398 | to_soc_camera_host(icd->dev.parent); | |
399 | ||
400 | WARN_ON(priv != file->private_data); | |
401 | ||
402 | strlcpy(cap->driver, ici->drv_name, sizeof(cap->driver)); | |
b8d9904c | 403 | return ici->ops->querycap(ici, cap); |
e55222ef GL |
404 | } |
405 | ||
406 | static int soc_camera_streamon(struct file *file, void *priv, | |
407 | enum v4l2_buf_type i) | |
408 | { | |
409 | struct soc_camera_file *icf = file->private_data; | |
410 | struct soc_camera_device *icd = icf->icd; | |
411 | ||
412 | WARN_ON(priv != file->private_data); | |
413 | ||
7e28adb2 | 414 | dev_dbg(&icd->dev, "%s\n", __func__); |
e55222ef GL |
415 | |
416 | if (i != V4L2_BUF_TYPE_VIDEO_CAPTURE) | |
417 | return -EINVAL; | |
418 | ||
419 | icd->ops->start_capture(icd); | |
420 | ||
421 | /* This calls buf_queue from host driver's videobuf_queue_ops */ | |
422 | return videobuf_streamon(&icf->vb_vidq); | |
423 | } | |
424 | ||
425 | static int soc_camera_streamoff(struct file *file, void *priv, | |
426 | enum v4l2_buf_type i) | |
427 | { | |
428 | struct soc_camera_file *icf = file->private_data; | |
429 | struct soc_camera_device *icd = icf->icd; | |
430 | ||
431 | WARN_ON(priv != file->private_data); | |
432 | ||
7e28adb2 | 433 | dev_dbg(&icd->dev, "%s\n", __func__); |
e55222ef GL |
434 | |
435 | if (i != V4L2_BUF_TYPE_VIDEO_CAPTURE) | |
436 | return -EINVAL; | |
437 | ||
438 | /* This calls buf_release from host driver's videobuf_queue_ops for all | |
439 | * remaining buffers. When the last buffer is freed, stop capture */ | |
440 | videobuf_streamoff(&icf->vb_vidq); | |
441 | ||
442 | icd->ops->stop_capture(icd); | |
443 | ||
444 | return 0; | |
445 | } | |
446 | ||
447 | static int soc_camera_queryctrl(struct file *file, void *priv, | |
448 | struct v4l2_queryctrl *qc) | |
449 | { | |
450 | struct soc_camera_file *icf = file->private_data; | |
451 | struct soc_camera_device *icd = icf->icd; | |
452 | int i; | |
453 | ||
454 | WARN_ON(priv != file->private_data); | |
455 | ||
456 | if (!qc->id) | |
457 | return -EINVAL; | |
458 | ||
459 | for (i = 0; i < icd->ops->num_controls; i++) | |
460 | if (qc->id == icd->ops->controls[i].id) { | |
461 | memcpy(qc, &(icd->ops->controls[i]), | |
462 | sizeof(*qc)); | |
463 | return 0; | |
464 | } | |
465 | ||
466 | return -EINVAL; | |
467 | } | |
468 | ||
469 | static int soc_camera_g_ctrl(struct file *file, void *priv, | |
470 | struct v4l2_control *ctrl) | |
471 | { | |
472 | struct soc_camera_file *icf = file->private_data; | |
473 | struct soc_camera_device *icd = icf->icd; | |
474 | ||
475 | WARN_ON(priv != file->private_data); | |
476 | ||
477 | switch (ctrl->id) { | |
478 | case V4L2_CID_GAIN: | |
479 | if (icd->gain == (unsigned short)~0) | |
480 | return -EINVAL; | |
481 | ctrl->value = icd->gain; | |
482 | return 0; | |
483 | case V4L2_CID_EXPOSURE: | |
484 | if (icd->exposure == (unsigned short)~0) | |
485 | return -EINVAL; | |
486 | ctrl->value = icd->exposure; | |
487 | return 0; | |
488 | } | |
489 | ||
490 | if (icd->ops->get_control) | |
491 | return icd->ops->get_control(icd, ctrl); | |
492 | return -EINVAL; | |
493 | } | |
494 | ||
495 | static int soc_camera_s_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 | if (icd->ops->set_control) | |
504 | return icd->ops->set_control(icd, ctrl); | |
505 | return -EINVAL; | |
506 | } | |
507 | ||
508 | static int soc_camera_cropcap(struct file *file, void *fh, | |
509 | struct v4l2_cropcap *a) | |
510 | { | |
511 | struct soc_camera_file *icf = file->private_data; | |
512 | struct soc_camera_device *icd = icf->icd; | |
513 | ||
514 | a->type = V4L2_BUF_TYPE_VIDEO_CAPTURE; | |
515 | a->bounds.left = icd->x_min; | |
516 | a->bounds.top = icd->y_min; | |
517 | a->bounds.width = icd->width_max; | |
518 | a->bounds.height = icd->height_max; | |
519 | a->defrect.left = icd->x_min; | |
520 | a->defrect.top = icd->y_min; | |
521 | a->defrect.width = 640; | |
522 | a->defrect.height = 480; | |
523 | a->pixelaspect.numerator = 1; | |
524 | a->pixelaspect.denominator = 1; | |
525 | ||
526 | return 0; | |
527 | } | |
528 | ||
529 | static int soc_camera_g_crop(struct file *file, void *fh, | |
530 | struct v4l2_crop *a) | |
531 | { | |
532 | struct soc_camera_file *icf = file->private_data; | |
533 | struct soc_camera_device *icd = icf->icd; | |
534 | ||
535 | a->type = V4L2_BUF_TYPE_VIDEO_CAPTURE; | |
536 | a->c.left = icd->x_current; | |
537 | a->c.top = icd->y_current; | |
538 | a->c.width = icd->width; | |
539 | a->c.height = icd->height; | |
540 | ||
541 | return 0; | |
542 | } | |
543 | ||
544 | static int soc_camera_s_crop(struct file *file, void *fh, | |
545 | struct v4l2_crop *a) | |
546 | { | |
547 | struct soc_camera_file *icf = file->private_data; | |
548 | struct soc_camera_device *icd = icf->icd; | |
549 | struct soc_camera_host *ici = | |
550 | to_soc_camera_host(icd->dev.parent); | |
551 | int ret; | |
552 | ||
553 | if (a->type != V4L2_BUF_TYPE_VIDEO_CAPTURE) | |
554 | return -EINVAL; | |
555 | ||
d8fac217 | 556 | ret = ici->ops->set_fmt(icd, 0, &a->c); |
e55222ef GL |
557 | if (!ret) { |
558 | icd->width = a->c.width; | |
559 | icd->height = a->c.height; | |
560 | icd->x_current = a->c.left; | |
561 | icd->y_current = a->c.top; | |
562 | } | |
563 | ||
564 | return ret; | |
565 | } | |
566 | ||
567 | static int soc_camera_g_chip_ident(struct file *file, void *fh, | |
568 | struct v4l2_chip_ident *id) | |
569 | { | |
570 | struct soc_camera_file *icf = file->private_data; | |
571 | struct soc_camera_device *icd = icf->icd; | |
572 | ||
573 | if (!icd->ops->get_chip_id) | |
574 | return -EINVAL; | |
575 | ||
576 | return icd->ops->get_chip_id(icd, id); | |
577 | } | |
578 | ||
579 | #ifdef CONFIG_VIDEO_ADV_DEBUG | |
580 | static int soc_camera_g_register(struct file *file, void *fh, | |
581 | struct v4l2_register *reg) | |
582 | { | |
583 | struct soc_camera_file *icf = file->private_data; | |
584 | struct soc_camera_device *icd = icf->icd; | |
585 | ||
586 | if (!icd->ops->get_register) | |
587 | return -EINVAL; | |
588 | ||
589 | return icd->ops->get_register(icd, reg); | |
590 | } | |
591 | ||
592 | static int soc_camera_s_register(struct file *file, void *fh, | |
593 | struct v4l2_register *reg) | |
594 | { | |
595 | struct soc_camera_file *icf = file->private_data; | |
596 | struct soc_camera_device *icd = icf->icd; | |
597 | ||
598 | if (!icd->ops->set_register) | |
599 | return -EINVAL; | |
600 | ||
601 | return icd->ops->set_register(icd, reg); | |
602 | } | |
603 | #endif | |
604 | ||
605 | static int device_register_link(struct soc_camera_device *icd) | |
606 | { | |
607 | int ret = device_register(&icd->dev); | |
608 | ||
609 | if (ret < 0) { | |
610 | /* Prevent calling device_unregister() */ | |
611 | icd->dev.parent = NULL; | |
612 | dev_err(&icd->dev, "Cannot register device: %d\n", ret); | |
613 | /* Even if probe() was unsuccessful for all registered drivers, | |
614 | * device_register() returns 0, and we add the link, just to | |
615 | * document this camera's control device */ | |
616 | } else if (icd->control) | |
617 | /* Have to sysfs_remove_link() before device_unregister()? */ | |
618 | if (sysfs_create_link(&icd->dev.kobj, &icd->control->kobj, | |
619 | "control")) | |
620 | dev_warn(&icd->dev, | |
621 | "Failed creating the control symlink\n"); | |
622 | return ret; | |
623 | } | |
624 | ||
625 | /* So far this function cannot fail */ | |
626 | static void scan_add_host(struct soc_camera_host *ici) | |
627 | { | |
628 | struct soc_camera_device *icd; | |
629 | ||
630 | mutex_lock(&list_lock); | |
631 | ||
632 | list_for_each_entry(icd, &devices, list) { | |
633 | if (icd->iface == ici->nr) { | |
634 | icd->dev.parent = &ici->dev; | |
635 | device_register_link(icd); | |
636 | } | |
637 | } | |
638 | ||
639 | mutex_unlock(&list_lock); | |
640 | } | |
641 | ||
642 | /* return: 0 if no match found or a match found and | |
643 | * device_register() successful, error code otherwise */ | |
644 | static int scan_add_device(struct soc_camera_device *icd) | |
645 | { | |
646 | struct soc_camera_host *ici; | |
647 | int ret = 0; | |
648 | ||
649 | mutex_lock(&list_lock); | |
650 | ||
651 | list_add_tail(&icd->list, &devices); | |
652 | ||
653 | /* Watch out for class_for_each_device / class_find_device API by | |
654 | * Dave Young <hidave.darkstar@gmail.com> */ | |
655 | list_for_each_entry(ici, &hosts, list) { | |
656 | if (icd->iface == ici->nr) { | |
657 | ret = 1; | |
658 | icd->dev.parent = &ici->dev; | |
659 | break; | |
660 | } | |
661 | } | |
662 | ||
663 | mutex_unlock(&list_lock); | |
664 | ||
665 | if (ret) | |
666 | ret = device_register_link(icd); | |
667 | ||
668 | return ret; | |
669 | } | |
670 | ||
671 | static int soc_camera_probe(struct device *dev) | |
672 | { | |
673 | struct soc_camera_device *icd = to_soc_camera_dev(dev); | |
674 | struct soc_camera_host *ici = | |
675 | to_soc_camera_host(icd->dev.parent); | |
676 | int ret; | |
677 | ||
26f1b942 | 678 | if (!icd->ops->probe) |
e55222ef GL |
679 | return -ENODEV; |
680 | ||
9dc4e48f GL |
681 | /* We only call ->add() here to activate and probe the camera. |
682 | * We shall ->remove() and deactivate it immediately afterwards. */ | |
b8d9904c | 683 | ret = ici->ops->add(icd); |
e55222ef GL |
684 | if (ret < 0) |
685 | return ret; | |
686 | ||
26f1b942 | 687 | ret = icd->ops->probe(icd); |
9dc4e48f | 688 | if (ret >= 0) { |
e55222ef GL |
689 | const struct v4l2_queryctrl *qctrl; |
690 | ||
691 | qctrl = soc_camera_find_qctrl(icd->ops, V4L2_CID_GAIN); | |
692 | icd->gain = qctrl ? qctrl->default_value : (unsigned short)~0; | |
693 | qctrl = soc_camera_find_qctrl(icd->ops, V4L2_CID_EXPOSURE); | |
694 | icd->exposure = qctrl ? qctrl->default_value : | |
695 | (unsigned short)~0; | |
696 | } | |
b8d9904c | 697 | ici->ops->remove(icd); |
e55222ef GL |
698 | |
699 | return ret; | |
700 | } | |
701 | ||
702 | /* This is called on device_unregister, which only means we have to disconnect | |
703 | * from the host, but not remove ourselves from the device list */ | |
704 | static int soc_camera_remove(struct device *dev) | |
705 | { | |
706 | struct soc_camera_device *icd = to_soc_camera_dev(dev); | |
e55222ef | 707 | |
26f1b942 GL |
708 | if (icd->ops->remove) |
709 | icd->ops->remove(icd); | |
e55222ef | 710 | |
e55222ef GL |
711 | return 0; |
712 | } | |
713 | ||
2e521061 RJ |
714 | static int soc_camera_suspend(struct device *dev, pm_message_t state) |
715 | { | |
716 | struct soc_camera_device *icd = to_soc_camera_dev(dev); | |
717 | struct soc_camera_host *ici = to_soc_camera_host(icd->dev.parent); | |
718 | int ret = 0; | |
719 | ||
720 | if (ici->ops->suspend) | |
721 | ret = ici->ops->suspend(icd, state); | |
722 | ||
723 | return ret; | |
724 | } | |
725 | ||
726 | static int soc_camera_resume(struct device *dev) | |
727 | { | |
728 | struct soc_camera_device *icd = to_soc_camera_dev(dev); | |
729 | struct soc_camera_host *ici = to_soc_camera_host(icd->dev.parent); | |
730 | int ret = 0; | |
731 | ||
732 | if (ici->ops->resume) | |
733 | ret = ici->ops->resume(icd); | |
734 | ||
735 | return ret; | |
736 | } | |
737 | ||
e55222ef GL |
738 | static struct bus_type soc_camera_bus_type = { |
739 | .name = "soc-camera", | |
740 | .probe = soc_camera_probe, | |
741 | .remove = soc_camera_remove, | |
2e521061 RJ |
742 | .suspend = soc_camera_suspend, |
743 | .resume = soc_camera_resume, | |
e55222ef GL |
744 | }; |
745 | ||
746 | static struct device_driver ic_drv = { | |
747 | .name = "camera", | |
748 | .bus = &soc_camera_bus_type, | |
749 | .owner = THIS_MODULE, | |
750 | }; | |
751 | ||
e55222ef GL |
752 | static void dummy_release(struct device *dev) |
753 | { | |
754 | } | |
755 | ||
b8d9904c | 756 | int soc_camera_host_register(struct soc_camera_host *ici) |
e55222ef GL |
757 | { |
758 | int ret; | |
759 | struct soc_camera_host *ix; | |
760 | ||
092d3921 | 761 | if (!ici->ops->init_videobuf || !ici->ops->add || !ici->ops->remove) |
e55222ef GL |
762 | return -EINVAL; |
763 | ||
764 | /* Number might be equal to the platform device ID */ | |
af128a10 | 765 | dev_set_name(&ici->dev, "camera_host%d", ici->nr); |
e55222ef GL |
766 | |
767 | mutex_lock(&list_lock); | |
768 | list_for_each_entry(ix, &hosts, list) { | |
769 | if (ix->nr == ici->nr) { | |
770 | mutex_unlock(&list_lock); | |
771 | return -EBUSY; | |
772 | } | |
773 | } | |
774 | ||
775 | list_add_tail(&ici->list, &hosts); | |
776 | mutex_unlock(&list_lock); | |
777 | ||
e55222ef GL |
778 | ici->dev.release = dummy_release; |
779 | ||
780 | ret = device_register(&ici->dev); | |
781 | ||
782 | if (ret) | |
783 | goto edevr; | |
784 | ||
785 | scan_add_host(ici); | |
786 | ||
787 | return 0; | |
788 | ||
789 | edevr: | |
790 | mutex_lock(&list_lock); | |
791 | list_del(&ici->list); | |
792 | mutex_unlock(&list_lock); | |
793 | ||
794 | return ret; | |
795 | } | |
796 | EXPORT_SYMBOL(soc_camera_host_register); | |
797 | ||
798 | /* Unregister all clients! */ | |
799 | void soc_camera_host_unregister(struct soc_camera_host *ici) | |
800 | { | |
801 | struct soc_camera_device *icd; | |
802 | ||
803 | mutex_lock(&list_lock); | |
804 | ||
805 | list_del(&ici->list); | |
806 | ||
807 | list_for_each_entry(icd, &devices, list) { | |
808 | if (icd->dev.parent == &ici->dev) { | |
809 | device_unregister(&icd->dev); | |
810 | /* Not before device_unregister(), .remove | |
b8d9904c | 811 | * needs parent to call ici->ops->remove() */ |
e55222ef GL |
812 | icd->dev.parent = NULL; |
813 | memset(&icd->dev.kobj, 0, sizeof(icd->dev.kobj)); | |
814 | } | |
815 | } | |
816 | ||
817 | mutex_unlock(&list_lock); | |
818 | ||
819 | device_unregister(&ici->dev); | |
820 | } | |
821 | EXPORT_SYMBOL(soc_camera_host_unregister); | |
822 | ||
823 | /* Image capture device */ | |
824 | int soc_camera_device_register(struct soc_camera_device *icd) | |
825 | { | |
826 | struct soc_camera_device *ix; | |
827 | int num = -1, i; | |
828 | ||
829 | if (!icd) | |
830 | return -EINVAL; | |
831 | ||
832 | for (i = 0; i < 256 && num < 0; i++) { | |
833 | num = i; | |
834 | list_for_each_entry(ix, &devices, list) { | |
835 | if (ix->iface == icd->iface && ix->devnum == i) { | |
836 | num = -1; | |
837 | break; | |
838 | } | |
839 | } | |
840 | } | |
841 | ||
842 | if (num < 0) | |
843 | /* ok, we have 256 cameras on this host... | |
844 | * man, stay reasonable... */ | |
845 | return -ENOMEM; | |
846 | ||
847 | icd->devnum = num; | |
848 | icd->dev.bus = &soc_camera_bus_type; | |
af128a10 | 849 | dev_set_name(&icd->dev, "%u-%u", icd->iface, icd->devnum); |
e55222ef GL |
850 | |
851 | icd->dev.release = dummy_release; | |
852 | ||
e55222ef GL |
853 | return scan_add_device(icd); |
854 | } | |
855 | EXPORT_SYMBOL(soc_camera_device_register); | |
856 | ||
857 | void soc_camera_device_unregister(struct soc_camera_device *icd) | |
858 | { | |
859 | mutex_lock(&list_lock); | |
860 | list_del(&icd->list); | |
861 | ||
862 | /* The bus->remove will be eventually called */ | |
863 | if (icd->dev.parent) | |
864 | device_unregister(&icd->dev); | |
865 | mutex_unlock(&list_lock); | |
866 | } | |
867 | EXPORT_SYMBOL(soc_camera_device_unregister); | |
868 | ||
a399810c HV |
869 | static const struct v4l2_ioctl_ops soc_camera_ioctl_ops = { |
870 | .vidioc_querycap = soc_camera_querycap, | |
871 | .vidioc_g_fmt_vid_cap = soc_camera_g_fmt_vid_cap, | |
872 | .vidioc_enum_fmt_vid_cap = soc_camera_enum_fmt_vid_cap, | |
873 | .vidioc_s_fmt_vid_cap = soc_camera_s_fmt_vid_cap, | |
874 | .vidioc_enum_input = soc_camera_enum_input, | |
875 | .vidioc_g_input = soc_camera_g_input, | |
876 | .vidioc_s_input = soc_camera_s_input, | |
877 | .vidioc_s_std = soc_camera_s_std, | |
878 | .vidioc_reqbufs = soc_camera_reqbufs, | |
879 | .vidioc_try_fmt_vid_cap = soc_camera_try_fmt_vid_cap, | |
880 | .vidioc_querybuf = soc_camera_querybuf, | |
881 | .vidioc_qbuf = soc_camera_qbuf, | |
882 | .vidioc_dqbuf = soc_camera_dqbuf, | |
883 | .vidioc_streamon = soc_camera_streamon, | |
884 | .vidioc_streamoff = soc_camera_streamoff, | |
885 | .vidioc_queryctrl = soc_camera_queryctrl, | |
886 | .vidioc_g_ctrl = soc_camera_g_ctrl, | |
887 | .vidioc_s_ctrl = soc_camera_s_ctrl, | |
888 | .vidioc_cropcap = soc_camera_cropcap, | |
889 | .vidioc_g_crop = soc_camera_g_crop, | |
890 | .vidioc_s_crop = soc_camera_s_crop, | |
891 | .vidioc_g_chip_ident = soc_camera_g_chip_ident, | |
892 | #ifdef CONFIG_VIDEO_ADV_DEBUG | |
893 | .vidioc_g_register = soc_camera_g_register, | |
894 | .vidioc_s_register = soc_camera_s_register, | |
895 | #endif | |
896 | }; | |
897 | ||
e55222ef GL |
898 | int soc_camera_video_start(struct soc_camera_device *icd) |
899 | { | |
900 | struct soc_camera_host *ici = to_soc_camera_host(icd->dev.parent); | |
901 | int err = -ENOMEM; | |
902 | struct video_device *vdev; | |
903 | ||
904 | if (!icd->dev.parent) | |
905 | return -ENODEV; | |
906 | ||
907 | vdev = video_device_alloc(); | |
908 | if (!vdev) | |
909 | goto evidallocd; | |
910 | dev_dbg(&ici->dev, "Allocated video_device %p\n", vdev); | |
911 | ||
912 | strlcpy(vdev->name, ici->drv_name, sizeof(vdev->name)); | |
913 | /* Maybe better &ici->dev */ | |
5e85e732 | 914 | vdev->parent = &icd->dev; |
e55222ef GL |
915 | vdev->current_norm = V4L2_STD_UNKNOWN; |
916 | vdev->fops = &soc_camera_fops; | |
a399810c | 917 | vdev->ioctl_ops = &soc_camera_ioctl_ops; |
e55222ef GL |
918 | vdev->release = video_device_release; |
919 | vdev->minor = -1; | |
920 | vdev->tvnorms = V4L2_STD_UNKNOWN, | |
e55222ef | 921 | |
26f1b942 | 922 | icd->current_fmt = &icd->formats[0]; |
e55222ef GL |
923 | |
924 | err = video_register_device(vdev, VFL_TYPE_GRABBER, vdev->minor); | |
925 | if (err < 0) { | |
5e85e732 | 926 | dev_err(vdev->parent, "video_register_device failed\n"); |
e55222ef GL |
927 | goto evidregd; |
928 | } | |
929 | icd->vdev = vdev; | |
930 | ||
931 | return 0; | |
932 | ||
933 | evidregd: | |
934 | video_device_release(vdev); | |
935 | evidallocd: | |
936 | return err; | |
937 | } | |
938 | EXPORT_SYMBOL(soc_camera_video_start); | |
939 | ||
940 | void soc_camera_video_stop(struct soc_camera_device *icd) | |
941 | { | |
942 | struct video_device *vdev = icd->vdev; | |
943 | ||
7e28adb2 | 944 | dev_dbg(&icd->dev, "%s\n", __func__); |
e55222ef GL |
945 | |
946 | if (!icd->dev.parent || !vdev) | |
947 | return; | |
948 | ||
949 | mutex_lock(&video_lock); | |
950 | video_unregister_device(vdev); | |
951 | icd->vdev = NULL; | |
952 | mutex_unlock(&video_lock); | |
953 | } | |
954 | EXPORT_SYMBOL(soc_camera_video_stop); | |
955 | ||
956 | static int __init soc_camera_init(void) | |
957 | { | |
958 | int ret = bus_register(&soc_camera_bus_type); | |
959 | if (ret) | |
960 | return ret; | |
961 | ret = driver_register(&ic_drv); | |
962 | if (ret) | |
963 | goto edrvr; | |
e55222ef GL |
964 | |
965 | return 0; | |
966 | ||
e55222ef GL |
967 | edrvr: |
968 | bus_unregister(&soc_camera_bus_type); | |
969 | return ret; | |
970 | } | |
971 | ||
972 | static void __exit soc_camera_exit(void) | |
973 | { | |
e55222ef GL |
974 | driver_unregister(&ic_drv); |
975 | bus_unregister(&soc_camera_bus_type); | |
976 | } | |
977 | ||
978 | module_init(soc_camera_init); | |
979 | module_exit(soc_camera_exit); | |
980 | ||
981 | MODULE_DESCRIPTION("Image capture bus driver"); | |
982 | MODULE_AUTHOR("Guennadi Liakhovetski <kernel@pengutronix.de>"); | |
983 | MODULE_LICENSE("GPL"); |