Commit | Line | Data |
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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); | |
e55222ef | 36 | |
25c4d74e | 37 | const struct soc_camera_data_format *soc_camera_format_by_fourcc( |
abe4c471 | 38 | struct soc_camera_device *icd, unsigned int fourcc) |
e55222ef GL |
39 | { |
40 | unsigned int i; | |
41 | ||
26f1b942 GL |
42 | for (i = 0; i < icd->num_formats; i++) |
43 | if (icd->formats[i].fourcc == fourcc) | |
44 | return icd->formats + i; | |
e55222ef GL |
45 | return NULL; |
46 | } | |
25c4d74e | 47 | EXPORT_SYMBOL(soc_camera_format_by_fourcc); |
e55222ef | 48 | |
c2786ad2 GL |
49 | const struct soc_camera_format_xlate *soc_camera_xlate_by_fourcc( |
50 | struct soc_camera_device *icd, unsigned int fourcc) | |
51 | { | |
52 | unsigned int i; | |
53 | ||
54 | for (i = 0; i < icd->num_user_formats; i++) | |
55 | if (icd->user_formats[i].host_fmt->fourcc == fourcc) | |
56 | return icd->user_formats + i; | |
57 | return NULL; | |
58 | } | |
59 | EXPORT_SYMBOL(soc_camera_xlate_by_fourcc); | |
60 | ||
bd73b36f GL |
61 | /** |
62 | * soc_camera_apply_sensor_flags() - apply platform SOCAM_SENSOR_INVERT_* flags | |
63 | * @icl: camera platform parameters | |
64 | * @flags: flags to be inverted according to platform configuration | |
65 | * @return: resulting flags | |
66 | */ | |
67 | unsigned long soc_camera_apply_sensor_flags(struct soc_camera_link *icl, | |
68 | unsigned long flags) | |
69 | { | |
70 | unsigned long f; | |
71 | ||
72 | /* If only one of the two polarities is supported, switch to the opposite */ | |
73 | if (icl->flags & SOCAM_SENSOR_INVERT_HSYNC) { | |
74 | f = flags & (SOCAM_HSYNC_ACTIVE_HIGH | SOCAM_HSYNC_ACTIVE_LOW); | |
75 | if (f == SOCAM_HSYNC_ACTIVE_HIGH || f == SOCAM_HSYNC_ACTIVE_LOW) | |
76 | flags ^= SOCAM_HSYNC_ACTIVE_HIGH | SOCAM_HSYNC_ACTIVE_LOW; | |
77 | } | |
78 | ||
79 | if (icl->flags & SOCAM_SENSOR_INVERT_VSYNC) { | |
80 | f = flags & (SOCAM_VSYNC_ACTIVE_HIGH | SOCAM_VSYNC_ACTIVE_LOW); | |
81 | if (f == SOCAM_VSYNC_ACTIVE_HIGH || f == SOCAM_VSYNC_ACTIVE_LOW) | |
82 | flags ^= SOCAM_VSYNC_ACTIVE_HIGH | SOCAM_VSYNC_ACTIVE_LOW; | |
83 | } | |
84 | ||
85 | if (icl->flags & SOCAM_SENSOR_INVERT_PCLK) { | |
86 | f = flags & (SOCAM_PCLK_SAMPLE_RISING | SOCAM_PCLK_SAMPLE_FALLING); | |
87 | if (f == SOCAM_PCLK_SAMPLE_RISING || f == SOCAM_PCLK_SAMPLE_FALLING) | |
88 | flags ^= SOCAM_PCLK_SAMPLE_RISING | SOCAM_PCLK_SAMPLE_FALLING; | |
89 | } | |
90 | ||
91 | return flags; | |
92 | } | |
93 | EXPORT_SYMBOL(soc_camera_apply_sensor_flags); | |
94 | ||
72937890 | 95 | static int soc_camera_try_fmt_vid_cap(struct file *file, void *priv, |
abe4c471 | 96 | struct v4l2_format *f) |
e55222ef GL |
97 | { |
98 | struct soc_camera_file *icf = file->private_data; | |
99 | struct soc_camera_device *icd = icf->icd; | |
64f5905e | 100 | struct soc_camera_host *ici = to_soc_camera_host(icd->dev.parent); |
e55222ef GL |
101 | |
102 | WARN_ON(priv != file->private_data); | |
103 | ||
ad5f2e85 | 104 | /* limit format to hardware capabilities */ |
06daa1af | 105 | return ici->ops->try_fmt(icd, f); |
e55222ef GL |
106 | } |
107 | ||
108 | static int soc_camera_enum_input(struct file *file, void *priv, | |
109 | struct v4l2_input *inp) | |
110 | { | |
34d359db KM |
111 | struct soc_camera_file *icf = file->private_data; |
112 | struct soc_camera_device *icd = icf->icd; | |
113 | int ret = 0; | |
114 | ||
e55222ef GL |
115 | if (inp->index != 0) |
116 | return -EINVAL; | |
117 | ||
34d359db KM |
118 | if (icd->ops->enum_input) |
119 | ret = icd->ops->enum_input(icd, inp); | |
120 | else { | |
121 | /* default is camera */ | |
122 | inp->type = V4L2_INPUT_TYPE_CAMERA; | |
123 | inp->std = V4L2_STD_UNKNOWN; | |
124 | strcpy(inp->name, "Camera"); | |
125 | } | |
e55222ef | 126 | |
34d359db | 127 | return ret; |
e55222ef GL |
128 | } |
129 | ||
130 | static int soc_camera_g_input(struct file *file, void *priv, unsigned int *i) | |
131 | { | |
132 | *i = 0; | |
133 | ||
134 | return 0; | |
135 | } | |
136 | ||
137 | static int soc_camera_s_input(struct file *file, void *priv, unsigned int i) | |
138 | { | |
139 | if (i > 0) | |
140 | return -EINVAL; | |
141 | ||
142 | return 0; | |
143 | } | |
144 | ||
145 | static int soc_camera_s_std(struct file *file, void *priv, v4l2_std_id *a) | |
146 | { | |
513791ab KM |
147 | struct soc_camera_file *icf = file->private_data; |
148 | struct soc_camera_device *icd = icf->icd; | |
149 | int ret = 0; | |
150 | ||
151 | if (icd->ops->set_std) | |
152 | ret = icd->ops->set_std(icd, a); | |
153 | ||
154 | return ret; | |
e55222ef GL |
155 | } |
156 | ||
157 | static int soc_camera_reqbufs(struct file *file, void *priv, | |
158 | struct v4l2_requestbuffers *p) | |
159 | { | |
160 | int ret; | |
161 | struct soc_camera_file *icf = file->private_data; | |
162 | struct soc_camera_device *icd = icf->icd; | |
64f5905e | 163 | struct soc_camera_host *ici = to_soc_camera_host(icd->dev.parent); |
e55222ef GL |
164 | |
165 | WARN_ON(priv != file->private_data); | |
166 | ||
7e28adb2 | 167 | dev_dbg(&icd->dev, "%s: %d\n", __func__, p->memory); |
e55222ef GL |
168 | |
169 | ret = videobuf_reqbufs(&icf->vb_vidq, p); | |
170 | if (ret < 0) | |
171 | return ret; | |
172 | ||
b8d9904c | 173 | return ici->ops->reqbufs(icf, p); |
e55222ef GL |
174 | } |
175 | ||
176 | static int soc_camera_querybuf(struct file *file, void *priv, | |
177 | struct v4l2_buffer *p) | |
178 | { | |
179 | struct soc_camera_file *icf = file->private_data; | |
180 | ||
181 | WARN_ON(priv != file->private_data); | |
182 | ||
183 | return videobuf_querybuf(&icf->vb_vidq, p); | |
184 | } | |
185 | ||
186 | static int soc_camera_qbuf(struct file *file, void *priv, | |
187 | struct v4l2_buffer *p) | |
188 | { | |
189 | struct soc_camera_file *icf = file->private_data; | |
190 | ||
191 | WARN_ON(priv != file->private_data); | |
192 | ||
193 | return videobuf_qbuf(&icf->vb_vidq, p); | |
194 | } | |
195 | ||
196 | static int soc_camera_dqbuf(struct file *file, void *priv, | |
197 | struct v4l2_buffer *p) | |
198 | { | |
199 | struct soc_camera_file *icf = file->private_data; | |
200 | ||
201 | WARN_ON(priv != file->private_data); | |
202 | ||
203 | return videobuf_dqbuf(&icf->vb_vidq, p, file->f_flags & O_NONBLOCK); | |
204 | } | |
205 | ||
c2786ad2 GL |
206 | static int soc_camera_init_user_formats(struct soc_camera_device *icd) |
207 | { | |
208 | struct soc_camera_host *ici = to_soc_camera_host(icd->dev.parent); | |
209 | int i, fmts = 0; | |
210 | ||
211 | if (!ici->ops->get_formats) | |
212 | /* | |
213 | * Fallback mode - the host will have to serve all | |
214 | * sensor-provided formats one-to-one to the user | |
215 | */ | |
216 | fmts = icd->num_formats; | |
217 | else | |
218 | /* | |
219 | * First pass - only count formats this host-sensor | |
220 | * configuration can provide | |
221 | */ | |
222 | for (i = 0; i < icd->num_formats; i++) | |
223 | fmts += ici->ops->get_formats(icd, i, NULL); | |
224 | ||
225 | if (!fmts) | |
226 | return -ENXIO; | |
227 | ||
228 | icd->user_formats = | |
229 | vmalloc(fmts * sizeof(struct soc_camera_format_xlate)); | |
230 | if (!icd->user_formats) | |
231 | return -ENOMEM; | |
232 | ||
233 | icd->num_user_formats = fmts; | |
234 | fmts = 0; | |
235 | ||
236 | dev_dbg(&icd->dev, "Found %d supported formats.\n", fmts); | |
237 | ||
238 | /* Second pass - actually fill data formats */ | |
239 | for (i = 0; i < icd->num_formats; i++) | |
240 | if (!ici->ops->get_formats) { | |
241 | icd->user_formats[i].host_fmt = icd->formats + i; | |
242 | icd->user_formats[i].cam_fmt = icd->formats + i; | |
243 | icd->user_formats[i].buswidth = icd->formats[i].depth; | |
244 | } else { | |
245 | fmts += ici->ops->get_formats(icd, i, | |
246 | &icd->user_formats[fmts]); | |
247 | } | |
248 | ||
249 | icd->current_fmt = icd->user_formats[0].host_fmt; | |
250 | ||
251 | return 0; | |
252 | } | |
253 | ||
254 | static void soc_camera_free_user_formats(struct soc_camera_device *icd) | |
255 | { | |
256 | vfree(icd->user_formats); | |
257 | } | |
258 | ||
bec43661 | 259 | static int soc_camera_open(struct file *file) |
e55222ef | 260 | { |
9dc4e48f GL |
261 | struct video_device *vdev; |
262 | struct soc_camera_device *icd; | |
263 | struct soc_camera_host *ici; | |
e55222ef GL |
264 | struct soc_camera_file *icf; |
265 | int ret; | |
266 | ||
267 | icf = vmalloc(sizeof(*icf)); | |
268 | if (!icf) | |
269 | return -ENOMEM; | |
270 | ||
1c3bb743 GL |
271 | /* |
272 | * It is safe to dereference these pointers now as long as a user has | |
273 | * the video device open - we are protected by the held cdev reference. | |
274 | */ | |
9dc4e48f GL |
275 | |
276 | vdev = video_devdata(file); | |
5e85e732 | 277 | icd = container_of(vdev->parent, struct soc_camera_device, dev); |
9dc4e48f | 278 | ici = to_soc_camera_host(icd->dev.parent); |
e55222ef GL |
279 | |
280 | if (!try_module_get(icd->ops->owner)) { | |
281 | dev_err(&icd->dev, "Couldn't lock sensor driver.\n"); | |
282 | ret = -EINVAL; | |
283 | goto emgd; | |
284 | } | |
285 | ||
b8d9904c | 286 | if (!try_module_get(ici->ops->owner)) { |
e55222ef GL |
287 | dev_err(&icd->dev, "Couldn't lock capture bus driver.\n"); |
288 | ret = -EINVAL; | |
289 | goto emgi; | |
290 | } | |
291 | ||
1c3bb743 GL |
292 | /* Protect against icd->remove() until we module_get() both drivers. */ |
293 | mutex_lock(&icd->video_lock); | |
294 | ||
9dc4e48f | 295 | icf->icd = icd; |
1a0063a9 GL |
296 | icd->use_count++; |
297 | ||
9dc4e48f GL |
298 | /* Now we really have to activate the camera */ |
299 | if (icd->use_count == 1) { | |
c2786ad2 GL |
300 | ret = soc_camera_init_user_formats(icd); |
301 | if (ret < 0) | |
302 | goto eiufmt; | |
b8d9904c | 303 | ret = ici->ops->add(icd); |
9dc4e48f GL |
304 | if (ret < 0) { |
305 | dev_err(&icd->dev, "Couldn't activate the camera: %d\n", ret); | |
9dc4e48f GL |
306 | goto eiciadd; |
307 | } | |
308 | } | |
309 | ||
1c3bb743 | 310 | mutex_unlock(&icd->video_lock); |
9dc4e48f | 311 | |
e55222ef GL |
312 | file->private_data = icf; |
313 | dev_dbg(&icd->dev, "camera device open\n"); | |
314 | ||
a034d1b7 | 315 | ici->ops->init_videobuf(&icf->vb_vidq, icd); |
e55222ef GL |
316 | |
317 | return 0; | |
318 | ||
1c3bb743 | 319 | /* First two errors are entered with the .video_lock held */ |
9dc4e48f | 320 | eiciadd: |
c2786ad2 GL |
321 | soc_camera_free_user_formats(icd); |
322 | eiufmt: | |
323 | icd->use_count--; | |
1c3bb743 | 324 | mutex_unlock(&icd->video_lock); |
b8d9904c | 325 | module_put(ici->ops->owner); |
e55222ef GL |
326 | emgi: |
327 | module_put(icd->ops->owner); | |
328 | emgd: | |
329 | vfree(icf); | |
330 | return ret; | |
331 | } | |
332 | ||
bec43661 | 333 | static int soc_camera_close(struct file *file) |
e55222ef GL |
334 | { |
335 | struct soc_camera_file *icf = file->private_data; | |
336 | struct soc_camera_device *icd = icf->icd; | |
337 | struct soc_camera_host *ici = to_soc_camera_host(icd->dev.parent); | |
338 | struct video_device *vdev = icd->vdev; | |
339 | ||
1c3bb743 | 340 | mutex_lock(&icd->video_lock); |
9dc4e48f | 341 | icd->use_count--; |
c2786ad2 | 342 | if (!icd->use_count) { |
b8d9904c | 343 | ici->ops->remove(icd); |
c2786ad2 GL |
344 | soc_camera_free_user_formats(icd); |
345 | } | |
1c3bb743 GL |
346 | mutex_unlock(&icd->video_lock); |
347 | ||
e55222ef | 348 | module_put(icd->ops->owner); |
b8d9904c | 349 | module_put(ici->ops->owner); |
9dc4e48f | 350 | |
1a0063a9 | 351 | vfree(icf); |
e55222ef | 352 | |
5e85e732 | 353 | dev_dbg(vdev->parent, "camera device close\n"); |
e55222ef GL |
354 | |
355 | return 0; | |
356 | } | |
357 | ||
aba360d8 | 358 | static ssize_t soc_camera_read(struct file *file, char __user *buf, |
abe4c471 | 359 | size_t count, loff_t *ppos) |
e55222ef GL |
360 | { |
361 | struct soc_camera_file *icf = file->private_data; | |
362 | struct soc_camera_device *icd = icf->icd; | |
363 | struct video_device *vdev = icd->vdev; | |
364 | int err = -EINVAL; | |
365 | ||
5e85e732 | 366 | dev_err(vdev->parent, "camera device read not implemented\n"); |
e55222ef GL |
367 | |
368 | return err; | |
369 | } | |
370 | ||
371 | static int soc_camera_mmap(struct file *file, struct vm_area_struct *vma) | |
372 | { | |
373 | struct soc_camera_file *icf = file->private_data; | |
374 | struct soc_camera_device *icd = icf->icd; | |
375 | int err; | |
376 | ||
377 | dev_dbg(&icd->dev, "mmap called, vma=0x%08lx\n", (unsigned long)vma); | |
378 | ||
379 | err = videobuf_mmap_mapper(&icf->vb_vidq, vma); | |
380 | ||
381 | dev_dbg(&icd->dev, "vma start=0x%08lx, size=%ld, ret=%d\n", | |
382 | (unsigned long)vma->vm_start, | |
383 | (unsigned long)vma->vm_end - (unsigned long)vma->vm_start, | |
384 | err); | |
385 | ||
386 | return err; | |
387 | } | |
388 | ||
389 | static unsigned int soc_camera_poll(struct file *file, poll_table *pt) | |
390 | { | |
391 | struct soc_camera_file *icf = file->private_data; | |
392 | struct soc_camera_device *icd = icf->icd; | |
64f5905e | 393 | struct soc_camera_host *ici = to_soc_camera_host(icd->dev.parent); |
e55222ef GL |
394 | |
395 | if (list_empty(&icf->vb_vidq.stream)) { | |
396 | dev_err(&icd->dev, "Trying to poll with no queued buffers!\n"); | |
397 | return POLLERR; | |
398 | } | |
399 | ||
b8d9904c | 400 | return ici->ops->poll(file, pt); |
e55222ef GL |
401 | } |
402 | ||
bec43661 | 403 | static struct v4l2_file_operations soc_camera_fops = { |
e55222ef GL |
404 | .owner = THIS_MODULE, |
405 | .open = soc_camera_open, | |
406 | .release = soc_camera_close, | |
407 | .ioctl = video_ioctl2, | |
408 | .read = soc_camera_read, | |
409 | .mmap = soc_camera_mmap, | |
410 | .poll = soc_camera_poll, | |
e55222ef GL |
411 | }; |
412 | ||
72937890 | 413 | static int soc_camera_s_fmt_vid_cap(struct file *file, void *priv, |
abe4c471 | 414 | struct v4l2_format *f) |
e55222ef GL |
415 | { |
416 | struct soc_camera_file *icf = file->private_data; | |
417 | struct soc_camera_device *icd = icf->icd; | |
64f5905e GL |
418 | struct soc_camera_host *ici = to_soc_camera_host(icd->dev.parent); |
419 | struct v4l2_pix_format *pix = &f->fmt.pix; | |
420 | __u32 pixfmt = pix->pixelformat; | |
e55222ef GL |
421 | int ret; |
422 | struct v4l2_rect rect; | |
e55222ef GL |
423 | |
424 | WARN_ON(priv != file->private_data); | |
425 | ||
25c4d74e | 426 | ret = soc_camera_try_fmt_vid_cap(file, priv, f); |
e55222ef GL |
427 | if (ret < 0) |
428 | return ret; | |
429 | ||
1c3bb743 GL |
430 | mutex_lock(&icf->vb_vidq.vb_lock); |
431 | ||
432 | if (videobuf_queue_is_busy(&icf->vb_vidq)) { | |
433 | dev_err(&icd->dev, "S_FMT denied: queue busy\n"); | |
434 | ret = -EBUSY; | |
435 | goto unlock; | |
436 | } | |
437 | ||
e55222ef GL |
438 | rect.left = icd->x_current; |
439 | rect.top = icd->y_current; | |
64f5905e GL |
440 | rect.width = pix->width; |
441 | rect.height = pix->height; | |
442 | ret = ici->ops->set_fmt(icd, pix->pixelformat, &rect); | |
25c4d74e | 443 | if (ret < 0) { |
1c3bb743 | 444 | goto unlock; |
25c4d74e | 445 | } else if (!icd->current_fmt || |
c2786ad2 GL |
446 | icd->current_fmt->fourcc != pixfmt) { |
447 | dev_err(&ici->dev, | |
448 | "Host driver hasn't set up current format correctly!\n"); | |
1c3bb743 GL |
449 | ret = -EINVAL; |
450 | goto unlock; | |
25c4d74e | 451 | } |
e55222ef | 452 | |
ad5f2e85 GL |
453 | icd->width = rect.width; |
454 | icd->height = rect.height; | |
64f5905e | 455 | icf->vb_vidq.field = pix->field; |
25c4d74e | 456 | if (f->type != V4L2_BUF_TYPE_VIDEO_CAPTURE) |
ad5f2e85 GL |
457 | dev_warn(&icd->dev, "Attention! Wrong buf-type %d\n", |
458 | f->type); | |
e55222ef | 459 | |
ad5f2e85 GL |
460 | dev_dbg(&icd->dev, "set width: %d height: %d\n", |
461 | icd->width, icd->height); | |
462 | ||
463 | /* set physical bus parameters */ | |
1c3bb743 GL |
464 | ret = ici->ops->set_bus_param(icd, pixfmt); |
465 | ||
466 | unlock: | |
467 | mutex_unlock(&icf->vb_vidq.vb_lock); | |
468 | ||
469 | return ret; | |
e55222ef GL |
470 | } |
471 | ||
72937890 | 472 | static int soc_camera_enum_fmt_vid_cap(struct file *file, void *priv, |
abe4c471 | 473 | struct v4l2_fmtdesc *f) |
e55222ef GL |
474 | { |
475 | struct soc_camera_file *icf = file->private_data; | |
476 | struct soc_camera_device *icd = icf->icd; | |
477 | const struct soc_camera_data_format *format; | |
478 | ||
479 | WARN_ON(priv != file->private_data); | |
480 | ||
c2786ad2 | 481 | if (f->index >= icd->num_user_formats) |
e55222ef GL |
482 | return -EINVAL; |
483 | ||
c2786ad2 | 484 | format = icd->user_formats[f->index].host_fmt; |
e55222ef GL |
485 | |
486 | strlcpy(f->description, format->name, sizeof(f->description)); | |
487 | f->pixelformat = format->fourcc; | |
488 | return 0; | |
489 | } | |
490 | ||
72937890 | 491 | static int soc_camera_g_fmt_vid_cap(struct file *file, void *priv, |
abe4c471 | 492 | struct v4l2_format *f) |
e55222ef GL |
493 | { |
494 | struct soc_camera_file *icf = file->private_data; | |
495 | struct soc_camera_device *icd = icf->icd; | |
64f5905e | 496 | struct v4l2_pix_format *pix = &f->fmt.pix; |
e55222ef GL |
497 | |
498 | WARN_ON(priv != file->private_data); | |
499 | ||
64f5905e GL |
500 | pix->width = icd->width; |
501 | pix->height = icd->height; | |
502 | pix->field = icf->vb_vidq.field; | |
503 | pix->pixelformat = icd->current_fmt->fourcc; | |
504 | pix->bytesperline = pix->width * | |
25c4d74e | 505 | DIV_ROUND_UP(icd->current_fmt->depth, 8); |
64f5905e | 506 | pix->sizeimage = pix->height * pix->bytesperline; |
e55222ef GL |
507 | dev_dbg(&icd->dev, "current_fmt->fourcc: 0x%08x\n", |
508 | icd->current_fmt->fourcc); | |
509 | return 0; | |
510 | } | |
511 | ||
512 | static int soc_camera_querycap(struct file *file, void *priv, | |
513 | struct v4l2_capability *cap) | |
514 | { | |
515 | struct soc_camera_file *icf = file->private_data; | |
516 | struct soc_camera_device *icd = icf->icd; | |
64f5905e | 517 | struct soc_camera_host *ici = to_soc_camera_host(icd->dev.parent); |
e55222ef GL |
518 | |
519 | WARN_ON(priv != file->private_data); | |
520 | ||
521 | strlcpy(cap->driver, ici->drv_name, sizeof(cap->driver)); | |
b8d9904c | 522 | return ici->ops->querycap(ici, cap); |
e55222ef GL |
523 | } |
524 | ||
525 | static int soc_camera_streamon(struct file *file, void *priv, | |
526 | enum v4l2_buf_type i) | |
527 | { | |
528 | struct soc_camera_file *icf = file->private_data; | |
529 | struct soc_camera_device *icd = icf->icd; | |
1c3bb743 | 530 | int ret; |
e55222ef GL |
531 | |
532 | WARN_ON(priv != file->private_data); | |
533 | ||
7e28adb2 | 534 | dev_dbg(&icd->dev, "%s\n", __func__); |
e55222ef GL |
535 | |
536 | if (i != V4L2_BUF_TYPE_VIDEO_CAPTURE) | |
537 | return -EINVAL; | |
538 | ||
1c3bb743 GL |
539 | mutex_lock(&icd->video_lock); |
540 | ||
e55222ef GL |
541 | icd->ops->start_capture(icd); |
542 | ||
543 | /* This calls buf_queue from host driver's videobuf_queue_ops */ | |
1c3bb743 GL |
544 | ret = videobuf_streamon(&icf->vb_vidq); |
545 | ||
546 | mutex_unlock(&icd->video_lock); | |
547 | ||
548 | return ret; | |
e55222ef GL |
549 | } |
550 | ||
551 | static int soc_camera_streamoff(struct file *file, void *priv, | |
552 | enum v4l2_buf_type i) | |
553 | { | |
554 | struct soc_camera_file *icf = file->private_data; | |
555 | struct soc_camera_device *icd = icf->icd; | |
556 | ||
557 | WARN_ON(priv != file->private_data); | |
558 | ||
7e28adb2 | 559 | dev_dbg(&icd->dev, "%s\n", __func__); |
e55222ef GL |
560 | |
561 | if (i != V4L2_BUF_TYPE_VIDEO_CAPTURE) | |
562 | return -EINVAL; | |
563 | ||
1c3bb743 GL |
564 | mutex_lock(&icd->video_lock); |
565 | ||
e55222ef GL |
566 | /* This calls buf_release from host driver's videobuf_queue_ops for all |
567 | * remaining buffers. When the last buffer is freed, stop capture */ | |
568 | videobuf_streamoff(&icf->vb_vidq); | |
569 | ||
570 | icd->ops->stop_capture(icd); | |
571 | ||
1c3bb743 GL |
572 | mutex_unlock(&icd->video_lock); |
573 | ||
e55222ef GL |
574 | return 0; |
575 | } | |
576 | ||
577 | static int soc_camera_queryctrl(struct file *file, void *priv, | |
578 | struct v4l2_queryctrl *qc) | |
579 | { | |
580 | struct soc_camera_file *icf = file->private_data; | |
581 | struct soc_camera_device *icd = icf->icd; | |
582 | int i; | |
583 | ||
584 | WARN_ON(priv != file->private_data); | |
585 | ||
586 | if (!qc->id) | |
587 | return -EINVAL; | |
588 | ||
589 | for (i = 0; i < icd->ops->num_controls; i++) | |
590 | if (qc->id == icd->ops->controls[i].id) { | |
591 | memcpy(qc, &(icd->ops->controls[i]), | |
592 | sizeof(*qc)); | |
593 | return 0; | |
594 | } | |
595 | ||
596 | return -EINVAL; | |
597 | } | |
598 | ||
599 | static int soc_camera_g_ctrl(struct file *file, void *priv, | |
600 | struct v4l2_control *ctrl) | |
601 | { | |
602 | struct soc_camera_file *icf = file->private_data; | |
603 | struct soc_camera_device *icd = icf->icd; | |
604 | ||
605 | WARN_ON(priv != file->private_data); | |
606 | ||
607 | switch (ctrl->id) { | |
608 | case V4L2_CID_GAIN: | |
609 | if (icd->gain == (unsigned short)~0) | |
610 | return -EINVAL; | |
611 | ctrl->value = icd->gain; | |
612 | return 0; | |
613 | case V4L2_CID_EXPOSURE: | |
614 | if (icd->exposure == (unsigned short)~0) | |
615 | return -EINVAL; | |
616 | ctrl->value = icd->exposure; | |
617 | return 0; | |
618 | } | |
619 | ||
620 | if (icd->ops->get_control) | |
621 | return icd->ops->get_control(icd, ctrl); | |
622 | return -EINVAL; | |
623 | } | |
624 | ||
625 | static int soc_camera_s_ctrl(struct file *file, void *priv, | |
626 | struct v4l2_control *ctrl) | |
627 | { | |
628 | struct soc_camera_file *icf = file->private_data; | |
629 | struct soc_camera_device *icd = icf->icd; | |
630 | ||
631 | WARN_ON(priv != file->private_data); | |
632 | ||
633 | if (icd->ops->set_control) | |
634 | return icd->ops->set_control(icd, ctrl); | |
635 | return -EINVAL; | |
636 | } | |
637 | ||
638 | static int soc_camera_cropcap(struct file *file, void *fh, | |
639 | struct v4l2_cropcap *a) | |
640 | { | |
641 | struct soc_camera_file *icf = file->private_data; | |
642 | struct soc_camera_device *icd = icf->icd; | |
643 | ||
644 | a->type = V4L2_BUF_TYPE_VIDEO_CAPTURE; | |
645 | a->bounds.left = icd->x_min; | |
646 | a->bounds.top = icd->y_min; | |
647 | a->bounds.width = icd->width_max; | |
648 | a->bounds.height = icd->height_max; | |
649 | a->defrect.left = icd->x_min; | |
650 | a->defrect.top = icd->y_min; | |
651 | a->defrect.width = 640; | |
652 | a->defrect.height = 480; | |
653 | a->pixelaspect.numerator = 1; | |
654 | a->pixelaspect.denominator = 1; | |
655 | ||
656 | return 0; | |
657 | } | |
658 | ||
659 | static int soc_camera_g_crop(struct file *file, void *fh, | |
660 | struct v4l2_crop *a) | |
661 | { | |
662 | struct soc_camera_file *icf = file->private_data; | |
663 | struct soc_camera_device *icd = icf->icd; | |
664 | ||
665 | a->type = V4L2_BUF_TYPE_VIDEO_CAPTURE; | |
666 | a->c.left = icd->x_current; | |
667 | a->c.top = icd->y_current; | |
668 | a->c.width = icd->width; | |
669 | a->c.height = icd->height; | |
670 | ||
671 | return 0; | |
672 | } | |
673 | ||
674 | static int soc_camera_s_crop(struct file *file, void *fh, | |
675 | struct v4l2_crop *a) | |
676 | { | |
677 | struct soc_camera_file *icf = file->private_data; | |
678 | struct soc_camera_device *icd = icf->icd; | |
64f5905e | 679 | struct soc_camera_host *ici = to_soc_camera_host(icd->dev.parent); |
e55222ef GL |
680 | int ret; |
681 | ||
682 | if (a->type != V4L2_BUF_TYPE_VIDEO_CAPTURE) | |
683 | return -EINVAL; | |
684 | ||
1c3bb743 GL |
685 | /* Cropping is allowed during a running capture, guard consistency */ |
686 | mutex_lock(&icf->vb_vidq.vb_lock); | |
687 | ||
d8fac217 | 688 | ret = ici->ops->set_fmt(icd, 0, &a->c); |
e55222ef GL |
689 | if (!ret) { |
690 | icd->width = a->c.width; | |
691 | icd->height = a->c.height; | |
692 | icd->x_current = a->c.left; | |
693 | icd->y_current = a->c.top; | |
694 | } | |
695 | ||
1c3bb743 GL |
696 | mutex_unlock(&icf->vb_vidq.vb_lock); |
697 | ||
e55222ef GL |
698 | return ret; |
699 | } | |
700 | ||
701 | static int soc_camera_g_chip_ident(struct file *file, void *fh, | |
aecde8b5 | 702 | struct v4l2_dbg_chip_ident *id) |
e55222ef GL |
703 | { |
704 | struct soc_camera_file *icf = file->private_data; | |
705 | struct soc_camera_device *icd = icf->icd; | |
706 | ||
707 | if (!icd->ops->get_chip_id) | |
708 | return -EINVAL; | |
709 | ||
710 | return icd->ops->get_chip_id(icd, id); | |
711 | } | |
712 | ||
713 | #ifdef CONFIG_VIDEO_ADV_DEBUG | |
714 | static int soc_camera_g_register(struct file *file, void *fh, | |
aecde8b5 | 715 | struct v4l2_dbg_register *reg) |
e55222ef GL |
716 | { |
717 | struct soc_camera_file *icf = file->private_data; | |
718 | struct soc_camera_device *icd = icf->icd; | |
719 | ||
720 | if (!icd->ops->get_register) | |
721 | return -EINVAL; | |
722 | ||
723 | return icd->ops->get_register(icd, reg); | |
724 | } | |
725 | ||
726 | static int soc_camera_s_register(struct file *file, void *fh, | |
aecde8b5 | 727 | struct v4l2_dbg_register *reg) |
e55222ef GL |
728 | { |
729 | struct soc_camera_file *icf = file->private_data; | |
730 | struct soc_camera_device *icd = icf->icd; | |
731 | ||
732 | if (!icd->ops->set_register) | |
733 | return -EINVAL; | |
734 | ||
735 | return icd->ops->set_register(icd, reg); | |
736 | } | |
737 | #endif | |
738 | ||
739 | static int device_register_link(struct soc_camera_device *icd) | |
740 | { | |
741 | int ret = device_register(&icd->dev); | |
742 | ||
743 | if (ret < 0) { | |
744 | /* Prevent calling device_unregister() */ | |
745 | icd->dev.parent = NULL; | |
746 | dev_err(&icd->dev, "Cannot register device: %d\n", ret); | |
747 | /* Even if probe() was unsuccessful for all registered drivers, | |
748 | * device_register() returns 0, and we add the link, just to | |
749 | * document this camera's control device */ | |
750 | } else if (icd->control) | |
751 | /* Have to sysfs_remove_link() before device_unregister()? */ | |
752 | if (sysfs_create_link(&icd->dev.kobj, &icd->control->kobj, | |
753 | "control")) | |
754 | dev_warn(&icd->dev, | |
755 | "Failed creating the control symlink\n"); | |
756 | return ret; | |
757 | } | |
758 | ||
759 | /* So far this function cannot fail */ | |
760 | static void scan_add_host(struct soc_camera_host *ici) | |
761 | { | |
762 | struct soc_camera_device *icd; | |
763 | ||
764 | mutex_lock(&list_lock); | |
765 | ||
766 | list_for_each_entry(icd, &devices, list) { | |
767 | if (icd->iface == ici->nr) { | |
768 | icd->dev.parent = &ici->dev; | |
769 | device_register_link(icd); | |
770 | } | |
771 | } | |
772 | ||
773 | mutex_unlock(&list_lock); | |
774 | } | |
775 | ||
776 | /* return: 0 if no match found or a match found and | |
777 | * device_register() successful, error code otherwise */ | |
778 | static int scan_add_device(struct soc_camera_device *icd) | |
779 | { | |
780 | struct soc_camera_host *ici; | |
781 | int ret = 0; | |
782 | ||
783 | mutex_lock(&list_lock); | |
784 | ||
785 | list_add_tail(&icd->list, &devices); | |
786 | ||
787 | /* Watch out for class_for_each_device / class_find_device API by | |
788 | * Dave Young <hidave.darkstar@gmail.com> */ | |
789 | list_for_each_entry(ici, &hosts, list) { | |
790 | if (icd->iface == ici->nr) { | |
791 | ret = 1; | |
792 | icd->dev.parent = &ici->dev; | |
793 | break; | |
794 | } | |
795 | } | |
796 | ||
797 | mutex_unlock(&list_lock); | |
798 | ||
799 | if (ret) | |
800 | ret = device_register_link(icd); | |
801 | ||
802 | return ret; | |
803 | } | |
804 | ||
805 | static int soc_camera_probe(struct device *dev) | |
806 | { | |
807 | struct soc_camera_device *icd = to_soc_camera_dev(dev); | |
64f5905e | 808 | struct soc_camera_host *ici = to_soc_camera_host(icd->dev.parent); |
e55222ef GL |
809 | int ret; |
810 | ||
1c3bb743 GL |
811 | /* |
812 | * Possible race scenario: | |
813 | * modprobe <camera-host-driver> triggers __func__ | |
814 | * at this moment respective <camera-sensor-driver> gets rmmod'ed | |
815 | * to protect take module references. | |
816 | */ | |
817 | ||
818 | if (!try_module_get(icd->ops->owner)) { | |
819 | dev_err(&icd->dev, "Couldn't lock sensor driver.\n"); | |
820 | ret = -EINVAL; | |
821 | goto emgd; | |
822 | } | |
823 | ||
824 | if (!try_module_get(ici->ops->owner)) { | |
825 | dev_err(&icd->dev, "Couldn't lock capture bus driver.\n"); | |
826 | ret = -EINVAL; | |
827 | goto emgi; | |
828 | } | |
829 | ||
830 | mutex_lock(&icd->video_lock); | |
831 | ||
9dc4e48f GL |
832 | /* We only call ->add() here to activate and probe the camera. |
833 | * We shall ->remove() and deactivate it immediately afterwards. */ | |
b8d9904c | 834 | ret = ici->ops->add(icd); |
e55222ef | 835 | if (ret < 0) |
1c3bb743 | 836 | goto eiadd; |
e55222ef | 837 | |
26f1b942 | 838 | ret = icd->ops->probe(icd); |
9dc4e48f | 839 | if (ret >= 0) { |
e55222ef GL |
840 | const struct v4l2_queryctrl *qctrl; |
841 | ||
842 | qctrl = soc_camera_find_qctrl(icd->ops, V4L2_CID_GAIN); | |
843 | icd->gain = qctrl ? qctrl->default_value : (unsigned short)~0; | |
844 | qctrl = soc_camera_find_qctrl(icd->ops, V4L2_CID_EXPOSURE); | |
845 | icd->exposure = qctrl ? qctrl->default_value : | |
846 | (unsigned short)~0; | |
847 | } | |
b8d9904c | 848 | ici->ops->remove(icd); |
e55222ef | 849 | |
1c3bb743 GL |
850 | eiadd: |
851 | mutex_unlock(&icd->video_lock); | |
852 | module_put(ici->ops->owner); | |
853 | emgi: | |
854 | module_put(icd->ops->owner); | |
855 | emgd: | |
e55222ef GL |
856 | return ret; |
857 | } | |
858 | ||
859 | /* This is called on device_unregister, which only means we have to disconnect | |
860 | * from the host, but not remove ourselves from the device list */ | |
861 | static int soc_camera_remove(struct device *dev) | |
862 | { | |
863 | struct soc_camera_device *icd = to_soc_camera_dev(dev); | |
e55222ef | 864 | |
26f1b942 GL |
865 | if (icd->ops->remove) |
866 | icd->ops->remove(icd); | |
e55222ef | 867 | |
e55222ef GL |
868 | return 0; |
869 | } | |
870 | ||
2e521061 RJ |
871 | static int soc_camera_suspend(struct device *dev, pm_message_t state) |
872 | { | |
873 | struct soc_camera_device *icd = to_soc_camera_dev(dev); | |
874 | struct soc_camera_host *ici = to_soc_camera_host(icd->dev.parent); | |
875 | int ret = 0; | |
876 | ||
877 | if (ici->ops->suspend) | |
878 | ret = ici->ops->suspend(icd, state); | |
879 | ||
880 | return ret; | |
881 | } | |
882 | ||
883 | static int soc_camera_resume(struct device *dev) | |
884 | { | |
885 | struct soc_camera_device *icd = to_soc_camera_dev(dev); | |
886 | struct soc_camera_host *ici = to_soc_camera_host(icd->dev.parent); | |
887 | int ret = 0; | |
888 | ||
889 | if (ici->ops->resume) | |
890 | ret = ici->ops->resume(icd); | |
891 | ||
892 | return ret; | |
893 | } | |
894 | ||
e55222ef GL |
895 | static struct bus_type soc_camera_bus_type = { |
896 | .name = "soc-camera", | |
897 | .probe = soc_camera_probe, | |
898 | .remove = soc_camera_remove, | |
2e521061 RJ |
899 | .suspend = soc_camera_suspend, |
900 | .resume = soc_camera_resume, | |
e55222ef GL |
901 | }; |
902 | ||
903 | static struct device_driver ic_drv = { | |
904 | .name = "camera", | |
905 | .bus = &soc_camera_bus_type, | |
906 | .owner = THIS_MODULE, | |
907 | }; | |
908 | ||
e55222ef GL |
909 | static void dummy_release(struct device *dev) |
910 | { | |
911 | } | |
912 | ||
b8d9904c | 913 | int soc_camera_host_register(struct soc_camera_host *ici) |
e55222ef GL |
914 | { |
915 | int ret; | |
916 | struct soc_camera_host *ix; | |
917 | ||
64f5905e GL |
918 | if (!ici || !ici->ops || |
919 | !ici->ops->try_fmt || | |
920 | !ici->ops->set_fmt || | |
921 | !ici->ops->set_bus_param || | |
922 | !ici->ops->querycap || | |
923 | !ici->ops->init_videobuf || | |
924 | !ici->ops->reqbufs || | |
925 | !ici->ops->add || | |
926 | !ici->ops->remove || | |
927 | !ici->ops->poll) | |
e55222ef GL |
928 | return -EINVAL; |
929 | ||
930 | /* Number might be equal to the platform device ID */ | |
af128a10 | 931 | dev_set_name(&ici->dev, "camera_host%d", ici->nr); |
e55222ef GL |
932 | |
933 | mutex_lock(&list_lock); | |
934 | list_for_each_entry(ix, &hosts, list) { | |
935 | if (ix->nr == ici->nr) { | |
936 | mutex_unlock(&list_lock); | |
937 | return -EBUSY; | |
938 | } | |
939 | } | |
940 | ||
941 | list_add_tail(&ici->list, &hosts); | |
942 | mutex_unlock(&list_lock); | |
943 | ||
e55222ef GL |
944 | ici->dev.release = dummy_release; |
945 | ||
946 | ret = device_register(&ici->dev); | |
947 | ||
948 | if (ret) | |
949 | goto edevr; | |
950 | ||
951 | scan_add_host(ici); | |
952 | ||
953 | return 0; | |
954 | ||
955 | edevr: | |
956 | mutex_lock(&list_lock); | |
957 | list_del(&ici->list); | |
958 | mutex_unlock(&list_lock); | |
959 | ||
960 | return ret; | |
961 | } | |
962 | EXPORT_SYMBOL(soc_camera_host_register); | |
963 | ||
964 | /* Unregister all clients! */ | |
965 | void soc_camera_host_unregister(struct soc_camera_host *ici) | |
966 | { | |
967 | struct soc_camera_device *icd; | |
968 | ||
969 | mutex_lock(&list_lock); | |
970 | ||
971 | list_del(&ici->list); | |
972 | ||
973 | list_for_each_entry(icd, &devices, list) { | |
974 | if (icd->dev.parent == &ici->dev) { | |
975 | device_unregister(&icd->dev); | |
976 | /* Not before device_unregister(), .remove | |
b8d9904c | 977 | * needs parent to call ici->ops->remove() */ |
e55222ef GL |
978 | icd->dev.parent = NULL; |
979 | memset(&icd->dev.kobj, 0, sizeof(icd->dev.kobj)); | |
980 | } | |
981 | } | |
982 | ||
983 | mutex_unlock(&list_lock); | |
984 | ||
985 | device_unregister(&ici->dev); | |
986 | } | |
987 | EXPORT_SYMBOL(soc_camera_host_unregister); | |
988 | ||
989 | /* Image capture device */ | |
990 | int soc_camera_device_register(struct soc_camera_device *icd) | |
991 | { | |
992 | struct soc_camera_device *ix; | |
993 | int num = -1, i; | |
994 | ||
64f5905e GL |
995 | if (!icd || !icd->ops || |
996 | !icd->ops->probe || | |
997 | !icd->ops->init || | |
998 | !icd->ops->release || | |
999 | !icd->ops->start_capture || | |
1000 | !icd->ops->stop_capture || | |
1001 | !icd->ops->set_fmt || | |
1002 | !icd->ops->try_fmt || | |
1003 | !icd->ops->query_bus_param || | |
1004 | !icd->ops->set_bus_param) | |
e55222ef GL |
1005 | return -EINVAL; |
1006 | ||
1007 | for (i = 0; i < 256 && num < 0; i++) { | |
1008 | num = i; | |
1009 | list_for_each_entry(ix, &devices, list) { | |
1010 | if (ix->iface == icd->iface && ix->devnum == i) { | |
1011 | num = -1; | |
1012 | break; | |
1013 | } | |
1014 | } | |
1015 | } | |
1016 | ||
1017 | if (num < 0) | |
1018 | /* ok, we have 256 cameras on this host... | |
1019 | * man, stay reasonable... */ | |
1020 | return -ENOMEM; | |
1021 | ||
1022 | icd->devnum = num; | |
1023 | icd->dev.bus = &soc_camera_bus_type; | |
af128a10 | 1024 | dev_set_name(&icd->dev, "%u-%u", icd->iface, icd->devnum); |
e55222ef | 1025 | |
64f5905e GL |
1026 | icd->dev.release = dummy_release; |
1027 | icd->use_count = 0; | |
1028 | icd->host_priv = NULL; | |
1c3bb743 | 1029 | mutex_init(&icd->video_lock); |
e55222ef | 1030 | |
e55222ef GL |
1031 | return scan_add_device(icd); |
1032 | } | |
1033 | EXPORT_SYMBOL(soc_camera_device_register); | |
1034 | ||
1035 | void soc_camera_device_unregister(struct soc_camera_device *icd) | |
1036 | { | |
1037 | mutex_lock(&list_lock); | |
1038 | list_del(&icd->list); | |
1039 | ||
1040 | /* The bus->remove will be eventually called */ | |
1041 | if (icd->dev.parent) | |
1042 | device_unregister(&icd->dev); | |
1043 | mutex_unlock(&list_lock); | |
1044 | } | |
1045 | EXPORT_SYMBOL(soc_camera_device_unregister); | |
1046 | ||
a399810c HV |
1047 | static const struct v4l2_ioctl_ops soc_camera_ioctl_ops = { |
1048 | .vidioc_querycap = soc_camera_querycap, | |
1049 | .vidioc_g_fmt_vid_cap = soc_camera_g_fmt_vid_cap, | |
1050 | .vidioc_enum_fmt_vid_cap = soc_camera_enum_fmt_vid_cap, | |
1051 | .vidioc_s_fmt_vid_cap = soc_camera_s_fmt_vid_cap, | |
1052 | .vidioc_enum_input = soc_camera_enum_input, | |
1053 | .vidioc_g_input = soc_camera_g_input, | |
1054 | .vidioc_s_input = soc_camera_s_input, | |
1055 | .vidioc_s_std = soc_camera_s_std, | |
1056 | .vidioc_reqbufs = soc_camera_reqbufs, | |
1057 | .vidioc_try_fmt_vid_cap = soc_camera_try_fmt_vid_cap, | |
1058 | .vidioc_querybuf = soc_camera_querybuf, | |
1059 | .vidioc_qbuf = soc_camera_qbuf, | |
1060 | .vidioc_dqbuf = soc_camera_dqbuf, | |
1061 | .vidioc_streamon = soc_camera_streamon, | |
1062 | .vidioc_streamoff = soc_camera_streamoff, | |
1063 | .vidioc_queryctrl = soc_camera_queryctrl, | |
1064 | .vidioc_g_ctrl = soc_camera_g_ctrl, | |
1065 | .vidioc_s_ctrl = soc_camera_s_ctrl, | |
1066 | .vidioc_cropcap = soc_camera_cropcap, | |
1067 | .vidioc_g_crop = soc_camera_g_crop, | |
1068 | .vidioc_s_crop = soc_camera_s_crop, | |
1069 | .vidioc_g_chip_ident = soc_camera_g_chip_ident, | |
1070 | #ifdef CONFIG_VIDEO_ADV_DEBUG | |
1071 | .vidioc_g_register = soc_camera_g_register, | |
1072 | .vidioc_s_register = soc_camera_s_register, | |
1073 | #endif | |
1074 | }; | |
1075 | ||
1c3bb743 GL |
1076 | /* |
1077 | * Usually called from the struct soc_camera_ops .probe() method, i.e., from | |
1078 | * soc_camera_probe() above with .video_lock held | |
1079 | */ | |
e55222ef GL |
1080 | int soc_camera_video_start(struct soc_camera_device *icd) |
1081 | { | |
1082 | struct soc_camera_host *ici = to_soc_camera_host(icd->dev.parent); | |
1083 | int err = -ENOMEM; | |
1084 | struct video_device *vdev; | |
1085 | ||
1086 | if (!icd->dev.parent) | |
1087 | return -ENODEV; | |
1088 | ||
1089 | vdev = video_device_alloc(); | |
1090 | if (!vdev) | |
1091 | goto evidallocd; | |
1092 | dev_dbg(&ici->dev, "Allocated video_device %p\n", vdev); | |
1093 | ||
1094 | strlcpy(vdev->name, ici->drv_name, sizeof(vdev->name)); | |
1c3bb743 | 1095 | |
5e85e732 | 1096 | vdev->parent = &icd->dev; |
e55222ef GL |
1097 | vdev->current_norm = V4L2_STD_UNKNOWN; |
1098 | vdev->fops = &soc_camera_fops; | |
a399810c | 1099 | vdev->ioctl_ops = &soc_camera_ioctl_ops; |
e55222ef GL |
1100 | vdev->release = video_device_release; |
1101 | vdev->minor = -1; | |
1102 | vdev->tvnorms = V4L2_STD_UNKNOWN, | |
e55222ef | 1103 | |
e55222ef GL |
1104 | err = video_register_device(vdev, VFL_TYPE_GRABBER, vdev->minor); |
1105 | if (err < 0) { | |
5e85e732 | 1106 | dev_err(vdev->parent, "video_register_device failed\n"); |
e55222ef GL |
1107 | goto evidregd; |
1108 | } | |
1109 | icd->vdev = vdev; | |
1110 | ||
1111 | return 0; | |
1112 | ||
1113 | evidregd: | |
1114 | video_device_release(vdev); | |
1115 | evidallocd: | |
1116 | return err; | |
1117 | } | |
1118 | EXPORT_SYMBOL(soc_camera_video_start); | |
1119 | ||
1120 | void soc_camera_video_stop(struct soc_camera_device *icd) | |
1121 | { | |
1122 | struct video_device *vdev = icd->vdev; | |
1123 | ||
7e28adb2 | 1124 | dev_dbg(&icd->dev, "%s\n", __func__); |
e55222ef GL |
1125 | |
1126 | if (!icd->dev.parent || !vdev) | |
1127 | return; | |
1128 | ||
1c3bb743 | 1129 | mutex_lock(&icd->video_lock); |
e55222ef GL |
1130 | video_unregister_device(vdev); |
1131 | icd->vdev = NULL; | |
1c3bb743 | 1132 | mutex_unlock(&icd->video_lock); |
e55222ef GL |
1133 | } |
1134 | EXPORT_SYMBOL(soc_camera_video_stop); | |
1135 | ||
1136 | static int __init soc_camera_init(void) | |
1137 | { | |
1138 | int ret = bus_register(&soc_camera_bus_type); | |
1139 | if (ret) | |
1140 | return ret; | |
1141 | ret = driver_register(&ic_drv); | |
1142 | if (ret) | |
1143 | goto edrvr; | |
e55222ef GL |
1144 | |
1145 | return 0; | |
1146 | ||
e55222ef GL |
1147 | edrvr: |
1148 | bus_unregister(&soc_camera_bus_type); | |
1149 | return ret; | |
1150 | } | |
1151 | ||
1152 | static void __exit soc_camera_exit(void) | |
1153 | { | |
e55222ef GL |
1154 | driver_unregister(&ic_drv); |
1155 | bus_unregister(&soc_camera_bus_type); | |
1156 | } | |
1157 | ||
1158 | module_init(soc_camera_init); | |
1159 | module_exit(soc_camera_exit); | |
1160 | ||
1161 | MODULE_DESCRIPTION("Image capture bus driver"); | |
1162 | MODULE_AUTHOR("Guennadi Liakhovetski <kernel@pengutronix.de>"); | |
1163 | MODULE_LICENSE("GPL"); |