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V4L/DVB (10135): v4l2: introduce v4l2_file_operations.
[deliverable/linux.git] / drivers / media / video / soc_camera.c
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-ioctl.h>
29 #include <media/v4l2-dev.h>
30 #include <media/videobuf-core.h>
31 #include <media/soc_camera.h>
32
33 static LIST_HEAD(hosts);
34 static LIST_HEAD(devices);
35 static DEFINE_MUTEX(list_lock);
36
37 const struct soc_camera_data_format *soc_camera_format_by_fourcc(
38 struct soc_camera_device *icd, unsigned int fourcc)
39 {
40 unsigned int i;
41
42 for (i = 0; i < icd->num_formats; i++)
43 if (icd->formats[i].fourcc == fourcc)
44 return icd->formats + i;
45 return NULL;
46 }
47 EXPORT_SYMBOL(soc_camera_format_by_fourcc);
48
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
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
95 static int soc_camera_try_fmt_vid_cap(struct file *file, void *priv,
96 struct v4l2_format *f)
97 {
98 struct soc_camera_file *icf = file->private_data;
99 struct soc_camera_device *icd = icf->icd;
100 struct soc_camera_host *ici = to_soc_camera_host(icd->dev.parent);
101
102 WARN_ON(priv != file->private_data);
103
104 /* limit format to hardware capabilities */
105 return ici->ops->try_fmt(icd, f);
106 }
107
108 static int soc_camera_enum_input(struct file *file, void *priv,
109 struct v4l2_input *inp)
110 {
111 struct soc_camera_file *icf = file->private_data;
112 struct soc_camera_device *icd = icf->icd;
113 int ret = 0;
114
115 if (inp->index != 0)
116 return -EINVAL;
117
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 }
126
127 return ret;
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 {
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;
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;
163 struct soc_camera_host *ici = to_soc_camera_host(icd->dev.parent);
164
165 WARN_ON(priv != file->private_data);
166
167 dev_dbg(&icd->dev, "%s: %d\n", __func__, p->memory);
168
169 ret = videobuf_reqbufs(&icf->vb_vidq, p);
170 if (ret < 0)
171 return ret;
172
173 return ici->ops->reqbufs(icf, p);
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
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
259 static int soc_camera_open(struct file *file)
260 {
261 struct video_device *vdev;
262 struct soc_camera_device *icd;
263 struct soc_camera_host *ici;
264 struct soc_camera_file *icf;
265 int ret;
266
267 icf = vmalloc(sizeof(*icf));
268 if (!icf)
269 return -ENOMEM;
270
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 */
275
276 vdev = video_devdata(file);
277 icd = container_of(vdev->parent, struct soc_camera_device, dev);
278 ici = to_soc_camera_host(icd->dev.parent);
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
286 if (!try_module_get(ici->ops->owner)) {
287 dev_err(&icd->dev, "Couldn't lock capture bus driver.\n");
288 ret = -EINVAL;
289 goto emgi;
290 }
291
292 /* Protect against icd->remove() until we module_get() both drivers. */
293 mutex_lock(&icd->video_lock);
294
295 icf->icd = icd;
296 icd->use_count++;
297
298 /* Now we really have to activate the camera */
299 if (icd->use_count == 1) {
300 ret = soc_camera_init_user_formats(icd);
301 if (ret < 0)
302 goto eiufmt;
303 ret = ici->ops->add(icd);
304 if (ret < 0) {
305 dev_err(&icd->dev, "Couldn't activate the camera: %d\n", ret);
306 goto eiciadd;
307 }
308 }
309
310 mutex_unlock(&icd->video_lock);
311
312 file->private_data = icf;
313 dev_dbg(&icd->dev, "camera device open\n");
314
315 ici->ops->init_videobuf(&icf->vb_vidq, icd);
316
317 return 0;
318
319 /* First two errors are entered with the .video_lock held */
320 eiciadd:
321 soc_camera_free_user_formats(icd);
322 eiufmt:
323 icd->use_count--;
324 mutex_unlock(&icd->video_lock);
325 module_put(ici->ops->owner);
326 emgi:
327 module_put(icd->ops->owner);
328 emgd:
329 vfree(icf);
330 return ret;
331 }
332
333 static int soc_camera_close(struct file *file)
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
340 mutex_lock(&icd->video_lock);
341 icd->use_count--;
342 if (!icd->use_count) {
343 ici->ops->remove(icd);
344 soc_camera_free_user_formats(icd);
345 }
346 mutex_unlock(&icd->video_lock);
347
348 module_put(icd->ops->owner);
349 module_put(ici->ops->owner);
350
351 vfree(icf);
352
353 dev_dbg(vdev->parent, "camera device close\n");
354
355 return 0;
356 }
357
358 static ssize_t soc_camera_read(struct file *file, char __user *buf,
359 size_t count, loff_t *ppos)
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
366 dev_err(vdev->parent, "camera device read not implemented\n");
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;
393 struct soc_camera_host *ici = to_soc_camera_host(icd->dev.parent);
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
400 return ici->ops->poll(file, pt);
401 }
402
403 static struct v4l2_file_operations soc_camera_fops = {
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,
411 };
412
413 static int soc_camera_s_fmt_vid_cap(struct file *file, void *priv,
414 struct v4l2_format *f)
415 {
416 struct soc_camera_file *icf = file->private_data;
417 struct soc_camera_device *icd = icf->icd;
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;
421 int ret;
422 struct v4l2_rect rect;
423
424 WARN_ON(priv != file->private_data);
425
426 ret = soc_camera_try_fmt_vid_cap(file, priv, f);
427 if (ret < 0)
428 return ret;
429
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
438 rect.left = icd->x_current;
439 rect.top = icd->y_current;
440 rect.width = pix->width;
441 rect.height = pix->height;
442 ret = ici->ops->set_fmt(icd, pix->pixelformat, &rect);
443 if (ret < 0) {
444 goto unlock;
445 } else if (!icd->current_fmt ||
446 icd->current_fmt->fourcc != pixfmt) {
447 dev_err(&ici->dev,
448 "Host driver hasn't set up current format correctly!\n");
449 ret = -EINVAL;
450 goto unlock;
451 }
452
453 icd->width = rect.width;
454 icd->height = rect.height;
455 icf->vb_vidq.field = pix->field;
456 if (f->type != V4L2_BUF_TYPE_VIDEO_CAPTURE)
457 dev_warn(&icd->dev, "Attention! Wrong buf-type %d\n",
458 f->type);
459
460 dev_dbg(&icd->dev, "set width: %d height: %d\n",
461 icd->width, icd->height);
462
463 /* set physical bus parameters */
464 ret = ici->ops->set_bus_param(icd, pixfmt);
465
466 unlock:
467 mutex_unlock(&icf->vb_vidq.vb_lock);
468
469 return ret;
470 }
471
472 static int soc_camera_enum_fmt_vid_cap(struct file *file, void *priv,
473 struct v4l2_fmtdesc *f)
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
481 if (f->index >= icd->num_user_formats)
482 return -EINVAL;
483
484 format = icd->user_formats[f->index].host_fmt;
485
486 strlcpy(f->description, format->name, sizeof(f->description));
487 f->pixelformat = format->fourcc;
488 return 0;
489 }
490
491 static int soc_camera_g_fmt_vid_cap(struct file *file, void *priv,
492 struct v4l2_format *f)
493 {
494 struct soc_camera_file *icf = file->private_data;
495 struct soc_camera_device *icd = icf->icd;
496 struct v4l2_pix_format *pix = &f->fmt.pix;
497
498 WARN_ON(priv != file->private_data);
499
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 *
505 DIV_ROUND_UP(icd->current_fmt->depth, 8);
506 pix->sizeimage = pix->height * pix->bytesperline;
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;
517 struct soc_camera_host *ici = to_soc_camera_host(icd->dev.parent);
518
519 WARN_ON(priv != file->private_data);
520
521 strlcpy(cap->driver, ici->drv_name, sizeof(cap->driver));
522 return ici->ops->querycap(ici, cap);
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;
530 int ret;
531
532 WARN_ON(priv != file->private_data);
533
534 dev_dbg(&icd->dev, "%s\n", __func__);
535
536 if (i != V4L2_BUF_TYPE_VIDEO_CAPTURE)
537 return -EINVAL;
538
539 mutex_lock(&icd->video_lock);
540
541 icd->ops->start_capture(icd);
542
543 /* This calls buf_queue from host driver's videobuf_queue_ops */
544 ret = videobuf_streamon(&icf->vb_vidq);
545
546 mutex_unlock(&icd->video_lock);
547
548 return ret;
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
559 dev_dbg(&icd->dev, "%s\n", __func__);
560
561 if (i != V4L2_BUF_TYPE_VIDEO_CAPTURE)
562 return -EINVAL;
563
564 mutex_lock(&icd->video_lock);
565
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
572 mutex_unlock(&icd->video_lock);
573
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;
679 struct soc_camera_host *ici = to_soc_camera_host(icd->dev.parent);
680 int ret;
681
682 if (a->type != V4L2_BUF_TYPE_VIDEO_CAPTURE)
683 return -EINVAL;
684
685 /* Cropping is allowed during a running capture, guard consistency */
686 mutex_lock(&icf->vb_vidq.vb_lock);
687
688 ret = ici->ops->set_fmt(icd, 0, &a->c);
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
696 mutex_unlock(&icf->vb_vidq.vb_lock);
697
698 return ret;
699 }
700
701 static int soc_camera_g_chip_ident(struct file *file, void *fh,
702 struct v4l2_chip_ident *id)
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,
715 struct v4l2_register *reg)
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,
727 struct v4l2_register *reg)
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);
808 struct soc_camera_host *ici = to_soc_camera_host(icd->dev.parent);
809 int ret;
810
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
832 /* We only call ->add() here to activate and probe the camera.
833 * We shall ->remove() and deactivate it immediately afterwards. */
834 ret = ici->ops->add(icd);
835 if (ret < 0)
836 goto eiadd;
837
838 ret = icd->ops->probe(icd);
839 if (ret >= 0) {
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 }
848 ici->ops->remove(icd);
849
850 eiadd:
851 mutex_unlock(&icd->video_lock);
852 module_put(ici->ops->owner);
853 emgi:
854 module_put(icd->ops->owner);
855 emgd:
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);
864
865 if (icd->ops->remove)
866 icd->ops->remove(icd);
867
868 return 0;
869 }
870
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
895 static struct bus_type soc_camera_bus_type = {
896 .name = "soc-camera",
897 .probe = soc_camera_probe,
898 .remove = soc_camera_remove,
899 .suspend = soc_camera_suspend,
900 .resume = soc_camera_resume,
901 };
902
903 static struct device_driver ic_drv = {
904 .name = "camera",
905 .bus = &soc_camera_bus_type,
906 .owner = THIS_MODULE,
907 };
908
909 static void dummy_release(struct device *dev)
910 {
911 }
912
913 int soc_camera_host_register(struct soc_camera_host *ici)
914 {
915 int ret;
916 struct soc_camera_host *ix;
917
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)
928 return -EINVAL;
929
930 /* Number might be equal to the platform device ID */
931 dev_set_name(&ici->dev, "camera_host%d", ici->nr);
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
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
977 * needs parent to call ici->ops->remove() */
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
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)
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;
1024 dev_set_name(&icd->dev, "%u-%u", icd->iface, icd->devnum);
1025
1026 icd->dev.release = dummy_release;
1027 icd->use_count = 0;
1028 icd->host_priv = NULL;
1029 mutex_init(&icd->video_lock);
1030
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
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
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 */
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));
1095
1096 vdev->parent = &icd->dev;
1097 vdev->current_norm = V4L2_STD_UNKNOWN;
1098 vdev->fops = &soc_camera_fops;
1099 vdev->ioctl_ops = &soc_camera_ioctl_ops;
1100 vdev->release = video_device_release;
1101 vdev->minor = -1;
1102 vdev->tvnorms = V4L2_STD_UNKNOWN,
1103
1104 err = video_register_device(vdev, VFL_TYPE_GRABBER, vdev->minor);
1105 if (err < 0) {
1106 dev_err(vdev->parent, "video_register_device failed\n");
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
1124 dev_dbg(&icd->dev, "%s\n", __func__);
1125
1126 if (!icd->dev.parent || !vdev)
1127 return;
1128
1129 mutex_lock(&icd->video_lock);
1130 video_unregister_device(vdev);
1131 icd->vdev = NULL;
1132 mutex_unlock(&icd->video_lock);
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;
1144
1145 return 0;
1146
1147 edrvr:
1148 bus_unregister(&soc_camera_bus_type);
1149 return ret;
1150 }
1151
1152 static void __exit soc_camera_exit(void)
1153 {
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");
Linux kernel - Deliverables
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