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Merge branch 'topic/tlv-minmax' into for-linus
[mirror_ubuntu-zesty-kernel.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/device.h>
20 #include <linux/err.h>
21 #include <linux/i2c.h>
22 #include <linux/init.h>
23 #include <linux/list.h>
24 #include <linux/module.h>
25 #include <linux/mutex.h>
26 #include <linux/platform_device.h>
27 #include <linux/vmalloc.h>
28
29 #include <media/soc_camera.h>
30 #include <media/v4l2-common.h>
31 #include <media/v4l2-dev.h>
32 #include <media/v4l2-ioctl.h>
33 #include <media/videobuf-core.h>
34
35 /* Default to VGA resolution */
36 #define DEFAULT_WIDTH 640
37 #define DEFAULT_HEIGHT 480
38
39 static LIST_HEAD(hosts);
40 static LIST_HEAD(devices);
41 static DEFINE_MUTEX(list_lock);
42
43 const struct soc_camera_data_format *soc_camera_format_by_fourcc(
44 struct soc_camera_device *icd, unsigned int fourcc)
45 {
46 unsigned int i;
47
48 for (i = 0; i < icd->num_formats; i++)
49 if (icd->formats[i].fourcc == fourcc)
50 return icd->formats + i;
51 return NULL;
52 }
53 EXPORT_SYMBOL(soc_camera_format_by_fourcc);
54
55 const struct soc_camera_format_xlate *soc_camera_xlate_by_fourcc(
56 struct soc_camera_device *icd, unsigned int fourcc)
57 {
58 unsigned int i;
59
60 for (i = 0; i < icd->num_user_formats; i++)
61 if (icd->user_formats[i].host_fmt->fourcc == fourcc)
62 return icd->user_formats + i;
63 return NULL;
64 }
65 EXPORT_SYMBOL(soc_camera_xlate_by_fourcc);
66
67 /**
68 * soc_camera_apply_sensor_flags() - apply platform SOCAM_SENSOR_INVERT_* flags
69 * @icl: camera platform parameters
70 * @flags: flags to be inverted according to platform configuration
71 * @return: resulting flags
72 */
73 unsigned long soc_camera_apply_sensor_flags(struct soc_camera_link *icl,
74 unsigned long flags)
75 {
76 unsigned long f;
77
78 /* If only one of the two polarities is supported, switch to the opposite */
79 if (icl->flags & SOCAM_SENSOR_INVERT_HSYNC) {
80 f = flags & (SOCAM_HSYNC_ACTIVE_HIGH | SOCAM_HSYNC_ACTIVE_LOW);
81 if (f == SOCAM_HSYNC_ACTIVE_HIGH || f == SOCAM_HSYNC_ACTIVE_LOW)
82 flags ^= SOCAM_HSYNC_ACTIVE_HIGH | SOCAM_HSYNC_ACTIVE_LOW;
83 }
84
85 if (icl->flags & SOCAM_SENSOR_INVERT_VSYNC) {
86 f = flags & (SOCAM_VSYNC_ACTIVE_HIGH | SOCAM_VSYNC_ACTIVE_LOW);
87 if (f == SOCAM_VSYNC_ACTIVE_HIGH || f == SOCAM_VSYNC_ACTIVE_LOW)
88 flags ^= SOCAM_VSYNC_ACTIVE_HIGH | SOCAM_VSYNC_ACTIVE_LOW;
89 }
90
91 if (icl->flags & SOCAM_SENSOR_INVERT_PCLK) {
92 f = flags & (SOCAM_PCLK_SAMPLE_RISING | SOCAM_PCLK_SAMPLE_FALLING);
93 if (f == SOCAM_PCLK_SAMPLE_RISING || f == SOCAM_PCLK_SAMPLE_FALLING)
94 flags ^= SOCAM_PCLK_SAMPLE_RISING | SOCAM_PCLK_SAMPLE_FALLING;
95 }
96
97 return flags;
98 }
99 EXPORT_SYMBOL(soc_camera_apply_sensor_flags);
100
101 static int soc_camera_try_fmt_vid_cap(struct file *file, void *priv,
102 struct v4l2_format *f)
103 {
104 struct soc_camera_file *icf = file->private_data;
105 struct soc_camera_device *icd = icf->icd;
106 struct soc_camera_host *ici = to_soc_camera_host(icd->dev.parent);
107
108 WARN_ON(priv != file->private_data);
109
110 /* limit format to hardware capabilities */
111 return ici->ops->try_fmt(icd, f);
112 }
113
114 static int soc_camera_enum_input(struct file *file, void *priv,
115 struct v4l2_input *inp)
116 {
117 struct soc_camera_file *icf = file->private_data;
118 struct soc_camera_device *icd = icf->icd;
119 int ret = 0;
120
121 if (inp->index != 0)
122 return -EINVAL;
123
124 if (icd->ops->enum_input)
125 ret = icd->ops->enum_input(icd, inp);
126 else {
127 /* default is camera */
128 inp->type = V4L2_INPUT_TYPE_CAMERA;
129 inp->std = V4L2_STD_UNKNOWN;
130 strcpy(inp->name, "Camera");
131 }
132
133 return ret;
134 }
135
136 static int soc_camera_g_input(struct file *file, void *priv, unsigned int *i)
137 {
138 *i = 0;
139
140 return 0;
141 }
142
143 static int soc_camera_s_input(struct file *file, void *priv, unsigned int i)
144 {
145 if (i > 0)
146 return -EINVAL;
147
148 return 0;
149 }
150
151 static int soc_camera_s_std(struct file *file, void *priv, v4l2_std_id *a)
152 {
153 struct soc_camera_file *icf = file->private_data;
154 struct soc_camera_device *icd = icf->icd;
155 int ret = 0;
156
157 if (icd->ops->set_std)
158 ret = icd->ops->set_std(icd, a);
159
160 return ret;
161 }
162
163 static int soc_camera_reqbufs(struct file *file, void *priv,
164 struct v4l2_requestbuffers *p)
165 {
166 int ret;
167 struct soc_camera_file *icf = file->private_data;
168 struct soc_camera_device *icd = icf->icd;
169 struct soc_camera_host *ici = to_soc_camera_host(icd->dev.parent);
170
171 WARN_ON(priv != file->private_data);
172
173 dev_dbg(&icd->dev, "%s: %d\n", __func__, p->memory);
174
175 ret = videobuf_reqbufs(&icf->vb_vidq, p);
176 if (ret < 0)
177 return ret;
178
179 return ici->ops->reqbufs(icf, p);
180 }
181
182 static int soc_camera_querybuf(struct file *file, void *priv,
183 struct v4l2_buffer *p)
184 {
185 struct soc_camera_file *icf = file->private_data;
186
187 WARN_ON(priv != file->private_data);
188
189 return videobuf_querybuf(&icf->vb_vidq, p);
190 }
191
192 static int soc_camera_qbuf(struct file *file, void *priv,
193 struct v4l2_buffer *p)
194 {
195 struct soc_camera_file *icf = file->private_data;
196
197 WARN_ON(priv != file->private_data);
198
199 return videobuf_qbuf(&icf->vb_vidq, p);
200 }
201
202 static int soc_camera_dqbuf(struct file *file, void *priv,
203 struct v4l2_buffer *p)
204 {
205 struct soc_camera_file *icf = file->private_data;
206
207 WARN_ON(priv != file->private_data);
208
209 return videobuf_dqbuf(&icf->vb_vidq, p, file->f_flags & O_NONBLOCK);
210 }
211
212 static int soc_camera_init_user_formats(struct soc_camera_device *icd)
213 {
214 struct soc_camera_host *ici = to_soc_camera_host(icd->dev.parent);
215 int i, fmts = 0;
216
217 if (!ici->ops->get_formats)
218 /*
219 * Fallback mode - the host will have to serve all
220 * sensor-provided formats one-to-one to the user
221 */
222 fmts = icd->num_formats;
223 else
224 /*
225 * First pass - only count formats this host-sensor
226 * configuration can provide
227 */
228 for (i = 0; i < icd->num_formats; i++)
229 fmts += ici->ops->get_formats(icd, i, NULL);
230
231 if (!fmts)
232 return -ENXIO;
233
234 icd->user_formats =
235 vmalloc(fmts * sizeof(struct soc_camera_format_xlate));
236 if (!icd->user_formats)
237 return -ENOMEM;
238
239 icd->num_user_formats = fmts;
240
241 dev_dbg(&icd->dev, "Found %d supported formats.\n", fmts);
242
243 /* Second pass - actually fill data formats */
244 fmts = 0;
245 for (i = 0; i < icd->num_formats; i++)
246 if (!ici->ops->get_formats) {
247 icd->user_formats[i].host_fmt = icd->formats + i;
248 icd->user_formats[i].cam_fmt = icd->formats + i;
249 icd->user_formats[i].buswidth = icd->formats[i].depth;
250 } else {
251 fmts += ici->ops->get_formats(icd, i,
252 &icd->user_formats[fmts]);
253 }
254
255 icd->current_fmt = icd->user_formats[0].host_fmt;
256
257 return 0;
258 }
259
260 static void soc_camera_free_user_formats(struct soc_camera_device *icd)
261 {
262 vfree(icd->user_formats);
263 }
264
265 /* Called with .vb_lock held */
266 static int soc_camera_set_fmt(struct soc_camera_file *icf,
267 struct v4l2_format *f)
268 {
269 struct soc_camera_device *icd = icf->icd;
270 struct soc_camera_host *ici = to_soc_camera_host(icd->dev.parent);
271 struct v4l2_pix_format *pix = &f->fmt.pix;
272 int ret;
273
274 /* We always call try_fmt() before set_fmt() or set_crop() */
275 ret = ici->ops->try_fmt(icd, f);
276 if (ret < 0)
277 return ret;
278
279 ret = ici->ops->set_fmt(icd, f);
280 if (ret < 0) {
281 return ret;
282 } else if (!icd->current_fmt ||
283 icd->current_fmt->fourcc != pix->pixelformat) {
284 dev_err(ici->dev,
285 "Host driver hasn't set up current format correctly!\n");
286 return -EINVAL;
287 }
288
289 icd->width = pix->width;
290 icd->height = pix->height;
291 icf->vb_vidq.field =
292 icd->field = pix->field;
293
294 if (f->type != V4L2_BUF_TYPE_VIDEO_CAPTURE)
295 dev_warn(&icd->dev, "Attention! Wrong buf-type %d\n",
296 f->type);
297
298 dev_dbg(&icd->dev, "set width: %d height: %d\n",
299 icd->width, icd->height);
300
301 /* set physical bus parameters */
302 return ici->ops->set_bus_param(icd, pix->pixelformat);
303 }
304
305 static int soc_camera_open(struct file *file)
306 {
307 struct video_device *vdev;
308 struct soc_camera_device *icd;
309 struct soc_camera_host *ici;
310 struct soc_camera_file *icf;
311 int ret;
312
313 icf = vmalloc(sizeof(*icf));
314 if (!icf)
315 return -ENOMEM;
316
317 /*
318 * It is safe to dereference these pointers now as long as a user has
319 * the video device open - we are protected by the held cdev reference.
320 */
321
322 vdev = video_devdata(file);
323 icd = container_of(vdev->parent, struct soc_camera_device, dev);
324 ici = to_soc_camera_host(icd->dev.parent);
325
326 if (!try_module_get(icd->ops->owner)) {
327 dev_err(&icd->dev, "Couldn't lock sensor driver.\n");
328 ret = -EINVAL;
329 goto emgd;
330 }
331
332 if (!try_module_get(ici->ops->owner)) {
333 dev_err(&icd->dev, "Couldn't lock capture bus driver.\n");
334 ret = -EINVAL;
335 goto emgi;
336 }
337
338 /* Protect against icd->remove() until we module_get() both drivers. */
339 mutex_lock(&icd->video_lock);
340
341 icf->icd = icd;
342 icd->use_count++;
343
344 /* Now we really have to activate the camera */
345 if (icd->use_count == 1) {
346 /* Restore parameters before the last close() per V4L2 API */
347 struct v4l2_format f = {
348 .type = V4L2_BUF_TYPE_VIDEO_CAPTURE,
349 .fmt.pix = {
350 .width = icd->width,
351 .height = icd->height,
352 .field = icd->field,
353 .pixelformat = icd->current_fmt->fourcc,
354 .colorspace = icd->current_fmt->colorspace,
355 },
356 };
357
358 ret = ici->ops->add(icd);
359 if (ret < 0) {
360 dev_err(&icd->dev, "Couldn't activate the camera: %d\n", ret);
361 goto eiciadd;
362 }
363
364 /* Try to configure with default parameters */
365 ret = soc_camera_set_fmt(icf, &f);
366 if (ret < 0)
367 goto esfmt;
368 }
369
370 mutex_unlock(&icd->video_lock);
371
372 file->private_data = icf;
373 dev_dbg(&icd->dev, "camera device open\n");
374
375 ici->ops->init_videobuf(&icf->vb_vidq, icd);
376
377 return 0;
378
379 /*
380 * First three errors are entered with the .video_lock held
381 * and use_count == 1
382 */
383 esfmt:
384 ici->ops->remove(icd);
385 eiciadd:
386 icd->use_count--;
387 mutex_unlock(&icd->video_lock);
388 module_put(ici->ops->owner);
389 emgi:
390 module_put(icd->ops->owner);
391 emgd:
392 vfree(icf);
393 return ret;
394 }
395
396 static int soc_camera_close(struct file *file)
397 {
398 struct soc_camera_file *icf = file->private_data;
399 struct soc_camera_device *icd = icf->icd;
400 struct soc_camera_host *ici = to_soc_camera_host(icd->dev.parent);
401 struct video_device *vdev = icd->vdev;
402
403 mutex_lock(&icd->video_lock);
404 icd->use_count--;
405 if (!icd->use_count)
406 ici->ops->remove(icd);
407
408 mutex_unlock(&icd->video_lock);
409
410 module_put(icd->ops->owner);
411 module_put(ici->ops->owner);
412
413 vfree(icf);
414
415 dev_dbg(vdev->parent, "camera device close\n");
416
417 return 0;
418 }
419
420 static ssize_t soc_camera_read(struct file *file, char __user *buf,
421 size_t count, loff_t *ppos)
422 {
423 struct soc_camera_file *icf = file->private_data;
424 struct soc_camera_device *icd = icf->icd;
425 struct video_device *vdev = icd->vdev;
426 int err = -EINVAL;
427
428 dev_err(vdev->parent, "camera device read not implemented\n");
429
430 return err;
431 }
432
433 static int soc_camera_mmap(struct file *file, struct vm_area_struct *vma)
434 {
435 struct soc_camera_file *icf = file->private_data;
436 struct soc_camera_device *icd = icf->icd;
437 int err;
438
439 dev_dbg(&icd->dev, "mmap called, vma=0x%08lx\n", (unsigned long)vma);
440
441 err = videobuf_mmap_mapper(&icf->vb_vidq, vma);
442
443 dev_dbg(&icd->dev, "vma start=0x%08lx, size=%ld, ret=%d\n",
444 (unsigned long)vma->vm_start,
445 (unsigned long)vma->vm_end - (unsigned long)vma->vm_start,
446 err);
447
448 return err;
449 }
450
451 static unsigned int soc_camera_poll(struct file *file, poll_table *pt)
452 {
453 struct soc_camera_file *icf = file->private_data;
454 struct soc_camera_device *icd = icf->icd;
455 struct soc_camera_host *ici = to_soc_camera_host(icd->dev.parent);
456
457 if (list_empty(&icf->vb_vidq.stream)) {
458 dev_err(&icd->dev, "Trying to poll with no queued buffers!\n");
459 return POLLERR;
460 }
461
462 return ici->ops->poll(file, pt);
463 }
464
465 static struct v4l2_file_operations soc_camera_fops = {
466 .owner = THIS_MODULE,
467 .open = soc_camera_open,
468 .release = soc_camera_close,
469 .ioctl = video_ioctl2,
470 .read = soc_camera_read,
471 .mmap = soc_camera_mmap,
472 .poll = soc_camera_poll,
473 };
474
475 static int soc_camera_s_fmt_vid_cap(struct file *file, void *priv,
476 struct v4l2_format *f)
477 {
478 struct soc_camera_file *icf = file->private_data;
479 struct soc_camera_device *icd = icf->icd;
480 int ret;
481
482 WARN_ON(priv != file->private_data);
483
484 mutex_lock(&icf->vb_vidq.vb_lock);
485
486 if (videobuf_queue_is_busy(&icf->vb_vidq)) {
487 dev_err(&icd->dev, "S_FMT denied: queue busy\n");
488 ret = -EBUSY;
489 goto unlock;
490 }
491
492 ret = soc_camera_set_fmt(icf, f);
493
494 unlock:
495 mutex_unlock(&icf->vb_vidq.vb_lock);
496
497 return ret;
498 }
499
500 static int soc_camera_enum_fmt_vid_cap(struct file *file, void *priv,
501 struct v4l2_fmtdesc *f)
502 {
503 struct soc_camera_file *icf = file->private_data;
504 struct soc_camera_device *icd = icf->icd;
505 const struct soc_camera_data_format *format;
506
507 WARN_ON(priv != file->private_data);
508
509 if (f->index >= icd->num_user_formats)
510 return -EINVAL;
511
512 format = icd->user_formats[f->index].host_fmt;
513
514 strlcpy(f->description, format->name, sizeof(f->description));
515 f->pixelformat = format->fourcc;
516 return 0;
517 }
518
519 static int soc_camera_g_fmt_vid_cap(struct file *file, void *priv,
520 struct v4l2_format *f)
521 {
522 struct soc_camera_file *icf = file->private_data;
523 struct soc_camera_device *icd = icf->icd;
524 struct v4l2_pix_format *pix = &f->fmt.pix;
525
526 WARN_ON(priv != file->private_data);
527
528 pix->width = icd->width;
529 pix->height = icd->height;
530 pix->field = icf->vb_vidq.field;
531 pix->pixelformat = icd->current_fmt->fourcc;
532 pix->bytesperline = pix->width *
533 DIV_ROUND_UP(icd->current_fmt->depth, 8);
534 pix->sizeimage = pix->height * pix->bytesperline;
535 dev_dbg(&icd->dev, "current_fmt->fourcc: 0x%08x\n",
536 icd->current_fmt->fourcc);
537 return 0;
538 }
539
540 static int soc_camera_querycap(struct file *file, void *priv,
541 struct v4l2_capability *cap)
542 {
543 struct soc_camera_file *icf = file->private_data;
544 struct soc_camera_device *icd = icf->icd;
545 struct soc_camera_host *ici = to_soc_camera_host(icd->dev.parent);
546
547 WARN_ON(priv != file->private_data);
548
549 strlcpy(cap->driver, ici->drv_name, sizeof(cap->driver));
550 return ici->ops->querycap(ici, cap);
551 }
552
553 static int soc_camera_streamon(struct file *file, void *priv,
554 enum v4l2_buf_type i)
555 {
556 struct soc_camera_file *icf = file->private_data;
557 struct soc_camera_device *icd = icf->icd;
558 int ret;
559
560 WARN_ON(priv != file->private_data);
561
562 dev_dbg(&icd->dev, "%s\n", __func__);
563
564 if (i != V4L2_BUF_TYPE_VIDEO_CAPTURE)
565 return -EINVAL;
566
567 mutex_lock(&icd->video_lock);
568
569 icd->ops->start_capture(icd);
570
571 /* This calls buf_queue from host driver's videobuf_queue_ops */
572 ret = videobuf_streamon(&icf->vb_vidq);
573
574 mutex_unlock(&icd->video_lock);
575
576 return ret;
577 }
578
579 static int soc_camera_streamoff(struct file *file, void *priv,
580 enum v4l2_buf_type i)
581 {
582 struct soc_camera_file *icf = file->private_data;
583 struct soc_camera_device *icd = icf->icd;
584
585 WARN_ON(priv != file->private_data);
586
587 dev_dbg(&icd->dev, "%s\n", __func__);
588
589 if (i != V4L2_BUF_TYPE_VIDEO_CAPTURE)
590 return -EINVAL;
591
592 mutex_lock(&icd->video_lock);
593
594 /* This calls buf_release from host driver's videobuf_queue_ops for all
595 * remaining buffers. When the last buffer is freed, stop capture */
596 videobuf_streamoff(&icf->vb_vidq);
597
598 icd->ops->stop_capture(icd);
599
600 mutex_unlock(&icd->video_lock);
601
602 return 0;
603 }
604
605 static int soc_camera_queryctrl(struct file *file, void *priv,
606 struct v4l2_queryctrl *qc)
607 {
608 struct soc_camera_file *icf = file->private_data;
609 struct soc_camera_device *icd = icf->icd;
610 int i;
611
612 WARN_ON(priv != file->private_data);
613
614 if (!qc->id)
615 return -EINVAL;
616
617 for (i = 0; i < icd->ops->num_controls; i++)
618 if (qc->id == icd->ops->controls[i].id) {
619 memcpy(qc, &(icd->ops->controls[i]),
620 sizeof(*qc));
621 return 0;
622 }
623
624 return -EINVAL;
625 }
626
627 static int soc_camera_g_ctrl(struct file *file, void *priv,
628 struct v4l2_control *ctrl)
629 {
630 struct soc_camera_file *icf = file->private_data;
631 struct soc_camera_device *icd = icf->icd;
632
633 WARN_ON(priv != file->private_data);
634
635 switch (ctrl->id) {
636 case V4L2_CID_GAIN:
637 if (icd->gain == (unsigned short)~0)
638 return -EINVAL;
639 ctrl->value = icd->gain;
640 return 0;
641 case V4L2_CID_EXPOSURE:
642 if (icd->exposure == (unsigned short)~0)
643 return -EINVAL;
644 ctrl->value = icd->exposure;
645 return 0;
646 }
647
648 if (icd->ops->get_control)
649 return icd->ops->get_control(icd, ctrl);
650 return -EINVAL;
651 }
652
653 static int soc_camera_s_ctrl(struct file *file, void *priv,
654 struct v4l2_control *ctrl)
655 {
656 struct soc_camera_file *icf = file->private_data;
657 struct soc_camera_device *icd = icf->icd;
658
659 WARN_ON(priv != file->private_data);
660
661 if (icd->ops->set_control)
662 return icd->ops->set_control(icd, ctrl);
663 return -EINVAL;
664 }
665
666 static int soc_camera_cropcap(struct file *file, void *fh,
667 struct v4l2_cropcap *a)
668 {
669 struct soc_camera_file *icf = file->private_data;
670 struct soc_camera_device *icd = icf->icd;
671
672 a->type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
673 a->bounds.left = icd->x_min;
674 a->bounds.top = icd->y_min;
675 a->bounds.width = icd->width_max;
676 a->bounds.height = icd->height_max;
677 a->defrect.left = icd->x_min;
678 a->defrect.top = icd->y_min;
679 a->defrect.width = DEFAULT_WIDTH;
680 a->defrect.height = DEFAULT_HEIGHT;
681 a->pixelaspect.numerator = 1;
682 a->pixelaspect.denominator = 1;
683
684 return 0;
685 }
686
687 static int soc_camera_g_crop(struct file *file, void *fh,
688 struct v4l2_crop *a)
689 {
690 struct soc_camera_file *icf = file->private_data;
691 struct soc_camera_device *icd = icf->icd;
692
693 a->type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
694 a->c.left = icd->x_current;
695 a->c.top = icd->y_current;
696 a->c.width = icd->width;
697 a->c.height = icd->height;
698
699 return 0;
700 }
701
702 static int soc_camera_s_crop(struct file *file, void *fh,
703 struct v4l2_crop *a)
704 {
705 struct soc_camera_file *icf = file->private_data;
706 struct soc_camera_device *icd = icf->icd;
707 struct soc_camera_host *ici = to_soc_camera_host(icd->dev.parent);
708 int ret;
709
710 if (a->type != V4L2_BUF_TYPE_VIDEO_CAPTURE)
711 return -EINVAL;
712
713 /* Cropping is allowed during a running capture, guard consistency */
714 mutex_lock(&icf->vb_vidq.vb_lock);
715
716 ret = ici->ops->set_crop(icd, &a->c);
717 if (!ret) {
718 icd->width = a->c.width;
719 icd->height = a->c.height;
720 icd->x_current = a->c.left;
721 icd->y_current = a->c.top;
722 }
723
724 mutex_unlock(&icf->vb_vidq.vb_lock);
725
726 return ret;
727 }
728
729 static int soc_camera_g_chip_ident(struct file *file, void *fh,
730 struct v4l2_dbg_chip_ident *id)
731 {
732 struct soc_camera_file *icf = file->private_data;
733 struct soc_camera_device *icd = icf->icd;
734
735 if (!icd->ops->get_chip_id)
736 return -EINVAL;
737
738 return icd->ops->get_chip_id(icd, id);
739 }
740
741 #ifdef CONFIG_VIDEO_ADV_DEBUG
742 static int soc_camera_g_register(struct file *file, void *fh,
743 struct v4l2_dbg_register *reg)
744 {
745 struct soc_camera_file *icf = file->private_data;
746 struct soc_camera_device *icd = icf->icd;
747
748 if (!icd->ops->get_register)
749 return -EINVAL;
750
751 return icd->ops->get_register(icd, reg);
752 }
753
754 static int soc_camera_s_register(struct file *file, void *fh,
755 struct v4l2_dbg_register *reg)
756 {
757 struct soc_camera_file *icf = file->private_data;
758 struct soc_camera_device *icd = icf->icd;
759
760 if (!icd->ops->set_register)
761 return -EINVAL;
762
763 return icd->ops->set_register(icd, reg);
764 }
765 #endif
766
767 static int device_register_link(struct soc_camera_device *icd)
768 {
769 int ret = dev_set_name(&icd->dev, "%u-%u", icd->iface, icd->devnum);
770
771 if (!ret)
772 ret = device_register(&icd->dev);
773
774 if (ret < 0) {
775 /* Prevent calling device_unregister() */
776 icd->dev.parent = NULL;
777 dev_err(&icd->dev, "Cannot register device: %d\n", ret);
778 /* Even if probe() was unsuccessful for all registered drivers,
779 * device_register() returns 0, and we add the link, just to
780 * document this camera's control device */
781 } else if (icd->control)
782 /* Have to sysfs_remove_link() before device_unregister()? */
783 if (sysfs_create_link(&icd->dev.kobj, &icd->control->kobj,
784 "control"))
785 dev_warn(&icd->dev,
786 "Failed creating the control symlink\n");
787 return ret;
788 }
789
790 /* So far this function cannot fail */
791 static void scan_add_host(struct soc_camera_host *ici)
792 {
793 struct soc_camera_device *icd;
794
795 mutex_lock(&list_lock);
796
797 list_for_each_entry(icd, &devices, list) {
798 if (icd->iface == ici->nr) {
799 icd->dev.parent = ici->dev;
800 device_register_link(icd);
801 }
802 }
803
804 mutex_unlock(&list_lock);
805 }
806
807 /* return: 0 if no match found or a match found and
808 * device_register() successful, error code otherwise */
809 static int scan_add_device(struct soc_camera_device *icd)
810 {
811 struct soc_camera_host *ici;
812 int ret = 0;
813
814 mutex_lock(&list_lock);
815
816 list_add_tail(&icd->list, &devices);
817
818 /* Watch out for class_for_each_device / class_find_device API by
819 * Dave Young <hidave.darkstar@gmail.com> */
820 list_for_each_entry(ici, &hosts, list) {
821 if (icd->iface == ici->nr) {
822 ret = 1;
823 icd->dev.parent = ici->dev;
824 break;
825 }
826 }
827
828 mutex_unlock(&list_lock);
829
830 if (ret)
831 ret = device_register_link(icd);
832
833 return ret;
834 }
835
836 static int soc_camera_probe(struct device *dev)
837 {
838 struct soc_camera_device *icd = to_soc_camera_dev(dev);
839 struct soc_camera_host *ici = to_soc_camera_host(icd->dev.parent);
840 int ret;
841
842 /*
843 * Possible race scenario:
844 * modprobe <camera-host-driver> triggers __func__
845 * at this moment respective <camera-sensor-driver> gets rmmod'ed
846 * to protect take module references.
847 */
848
849 if (!try_module_get(icd->ops->owner)) {
850 dev_err(&icd->dev, "Couldn't lock sensor driver.\n");
851 ret = -EINVAL;
852 goto emgd;
853 }
854
855 if (!try_module_get(ici->ops->owner)) {
856 dev_err(&icd->dev, "Couldn't lock capture bus driver.\n");
857 ret = -EINVAL;
858 goto emgi;
859 }
860
861 mutex_lock(&icd->video_lock);
862
863 /* We only call ->add() here to activate and probe the camera.
864 * We shall ->remove() and deactivate it immediately afterwards. */
865 ret = ici->ops->add(icd);
866 if (ret < 0)
867 goto eiadd;
868
869 ret = icd->ops->probe(icd);
870 if (ret >= 0) {
871 const struct v4l2_queryctrl *qctrl;
872
873 qctrl = soc_camera_find_qctrl(icd->ops, V4L2_CID_GAIN);
874 icd->gain = qctrl ? qctrl->default_value : (unsigned short)~0;
875 qctrl = soc_camera_find_qctrl(icd->ops, V4L2_CID_EXPOSURE);
876 icd->exposure = qctrl ? qctrl->default_value :
877 (unsigned short)~0;
878
879 ret = soc_camera_init_user_formats(icd);
880 if (ret < 0) {
881 if (icd->ops->remove)
882 icd->ops->remove(icd);
883 goto eiufmt;
884 }
885
886 icd->height = DEFAULT_HEIGHT;
887 icd->width = DEFAULT_WIDTH;
888 icd->field = V4L2_FIELD_ANY;
889 }
890
891 eiufmt:
892 ici->ops->remove(icd);
893 eiadd:
894 mutex_unlock(&icd->video_lock);
895 module_put(ici->ops->owner);
896 emgi:
897 module_put(icd->ops->owner);
898 emgd:
899 return ret;
900 }
901
902 /* This is called on device_unregister, which only means we have to disconnect
903 * from the host, but not remove ourselves from the device list */
904 static int soc_camera_remove(struct device *dev)
905 {
906 struct soc_camera_device *icd = to_soc_camera_dev(dev);
907
908 mutex_lock(&icd->video_lock);
909 if (icd->ops->remove)
910 icd->ops->remove(icd);
911 mutex_unlock(&icd->video_lock);
912
913 soc_camera_free_user_formats(icd);
914
915 return 0;
916 }
917
918 static int soc_camera_suspend(struct device *dev, pm_message_t state)
919 {
920 struct soc_camera_device *icd = to_soc_camera_dev(dev);
921 struct soc_camera_host *ici = to_soc_camera_host(icd->dev.parent);
922 int ret = 0;
923
924 if (ici->ops->suspend)
925 ret = ici->ops->suspend(icd, state);
926
927 return ret;
928 }
929
930 static int soc_camera_resume(struct device *dev)
931 {
932 struct soc_camera_device *icd = to_soc_camera_dev(dev);
933 struct soc_camera_host *ici = to_soc_camera_host(icd->dev.parent);
934 int ret = 0;
935
936 if (ici->ops->resume)
937 ret = ici->ops->resume(icd);
938
939 return ret;
940 }
941
942 static struct bus_type soc_camera_bus_type = {
943 .name = "soc-camera",
944 .probe = soc_camera_probe,
945 .remove = soc_camera_remove,
946 .suspend = soc_camera_suspend,
947 .resume = soc_camera_resume,
948 };
949
950 static struct device_driver ic_drv = {
951 .name = "camera",
952 .bus = &soc_camera_bus_type,
953 .owner = THIS_MODULE,
954 };
955
956 static void dummy_release(struct device *dev)
957 {
958 }
959
960 int soc_camera_host_register(struct soc_camera_host *ici)
961 {
962 struct soc_camera_host *ix;
963
964 if (!ici || !ici->ops ||
965 !ici->ops->try_fmt ||
966 !ici->ops->set_fmt ||
967 !ici->ops->set_crop ||
968 !ici->ops->set_bus_param ||
969 !ici->ops->querycap ||
970 !ici->ops->init_videobuf ||
971 !ici->ops->reqbufs ||
972 !ici->ops->add ||
973 !ici->ops->remove ||
974 !ici->ops->poll ||
975 !ici->dev)
976 return -EINVAL;
977
978 mutex_lock(&list_lock);
979 list_for_each_entry(ix, &hosts, list) {
980 if (ix->nr == ici->nr) {
981 mutex_unlock(&list_lock);
982 return -EBUSY;
983 }
984 }
985
986 dev_set_drvdata(ici->dev, ici);
987
988 list_add_tail(&ici->list, &hosts);
989 mutex_unlock(&list_lock);
990
991 scan_add_host(ici);
992
993 return 0;
994 }
995 EXPORT_SYMBOL(soc_camera_host_register);
996
997 /* Unregister all clients! */
998 void soc_camera_host_unregister(struct soc_camera_host *ici)
999 {
1000 struct soc_camera_device *icd;
1001
1002 mutex_lock(&list_lock);
1003
1004 list_del(&ici->list);
1005
1006 list_for_each_entry(icd, &devices, list) {
1007 if (icd->dev.parent == ici->dev) {
1008 device_unregister(&icd->dev);
1009 /* Not before device_unregister(), .remove
1010 * needs parent to call ici->ops->remove() */
1011 icd->dev.parent = NULL;
1012 memset(&icd->dev.kobj, 0, sizeof(icd->dev.kobj));
1013 }
1014 }
1015
1016 mutex_unlock(&list_lock);
1017
1018 dev_set_drvdata(ici->dev, NULL);
1019 }
1020 EXPORT_SYMBOL(soc_camera_host_unregister);
1021
1022 /* Image capture device */
1023 int soc_camera_device_register(struct soc_camera_device *icd)
1024 {
1025 struct soc_camera_device *ix;
1026 int num = -1, i;
1027
1028 if (!icd || !icd->ops ||
1029 !icd->ops->probe ||
1030 !icd->ops->init ||
1031 !icd->ops->release ||
1032 !icd->ops->start_capture ||
1033 !icd->ops->stop_capture ||
1034 !icd->ops->set_crop ||
1035 !icd->ops->set_fmt ||
1036 !icd->ops->try_fmt ||
1037 !icd->ops->query_bus_param ||
1038 !icd->ops->set_bus_param)
1039 return -EINVAL;
1040
1041 for (i = 0; i < 256 && num < 0; i++) {
1042 num = i;
1043 list_for_each_entry(ix, &devices, list) {
1044 if (ix->iface == icd->iface && ix->devnum == i) {
1045 num = -1;
1046 break;
1047 }
1048 }
1049 }
1050
1051 if (num < 0)
1052 /* ok, we have 256 cameras on this host...
1053 * man, stay reasonable... */
1054 return -ENOMEM;
1055
1056 icd->devnum = num;
1057 icd->dev.bus = &soc_camera_bus_type;
1058
1059 icd->dev.release = dummy_release;
1060 icd->use_count = 0;
1061 icd->host_priv = NULL;
1062 mutex_init(&icd->video_lock);
1063
1064 return scan_add_device(icd);
1065 }
1066 EXPORT_SYMBOL(soc_camera_device_register);
1067
1068 void soc_camera_device_unregister(struct soc_camera_device *icd)
1069 {
1070 mutex_lock(&list_lock);
1071 list_del(&icd->list);
1072
1073 /* The bus->remove will be eventually called */
1074 if (icd->dev.parent)
1075 device_unregister(&icd->dev);
1076 mutex_unlock(&list_lock);
1077 }
1078 EXPORT_SYMBOL(soc_camera_device_unregister);
1079
1080 static const struct v4l2_ioctl_ops soc_camera_ioctl_ops = {
1081 .vidioc_querycap = soc_camera_querycap,
1082 .vidioc_g_fmt_vid_cap = soc_camera_g_fmt_vid_cap,
1083 .vidioc_enum_fmt_vid_cap = soc_camera_enum_fmt_vid_cap,
1084 .vidioc_s_fmt_vid_cap = soc_camera_s_fmt_vid_cap,
1085 .vidioc_enum_input = soc_camera_enum_input,
1086 .vidioc_g_input = soc_camera_g_input,
1087 .vidioc_s_input = soc_camera_s_input,
1088 .vidioc_s_std = soc_camera_s_std,
1089 .vidioc_reqbufs = soc_camera_reqbufs,
1090 .vidioc_try_fmt_vid_cap = soc_camera_try_fmt_vid_cap,
1091 .vidioc_querybuf = soc_camera_querybuf,
1092 .vidioc_qbuf = soc_camera_qbuf,
1093 .vidioc_dqbuf = soc_camera_dqbuf,
1094 .vidioc_streamon = soc_camera_streamon,
1095 .vidioc_streamoff = soc_camera_streamoff,
1096 .vidioc_queryctrl = soc_camera_queryctrl,
1097 .vidioc_g_ctrl = soc_camera_g_ctrl,
1098 .vidioc_s_ctrl = soc_camera_s_ctrl,
1099 .vidioc_cropcap = soc_camera_cropcap,
1100 .vidioc_g_crop = soc_camera_g_crop,
1101 .vidioc_s_crop = soc_camera_s_crop,
1102 .vidioc_g_chip_ident = soc_camera_g_chip_ident,
1103 #ifdef CONFIG_VIDEO_ADV_DEBUG
1104 .vidioc_g_register = soc_camera_g_register,
1105 .vidioc_s_register = soc_camera_s_register,
1106 #endif
1107 };
1108
1109 /*
1110 * Usually called from the struct soc_camera_ops .probe() method, i.e., from
1111 * soc_camera_probe() above with .video_lock held
1112 */
1113 int soc_camera_video_start(struct soc_camera_device *icd)
1114 {
1115 struct soc_camera_host *ici = to_soc_camera_host(icd->dev.parent);
1116 int err = -ENOMEM;
1117 struct video_device *vdev;
1118
1119 if (!icd->dev.parent)
1120 return -ENODEV;
1121
1122 vdev = video_device_alloc();
1123 if (!vdev)
1124 goto evidallocd;
1125 dev_dbg(ici->dev, "Allocated video_device %p\n", vdev);
1126
1127 strlcpy(vdev->name, ici->drv_name, sizeof(vdev->name));
1128
1129 vdev->parent = &icd->dev;
1130 vdev->current_norm = V4L2_STD_UNKNOWN;
1131 vdev->fops = &soc_camera_fops;
1132 vdev->ioctl_ops = &soc_camera_ioctl_ops;
1133 vdev->release = video_device_release;
1134 vdev->minor = -1;
1135 vdev->tvnorms = V4L2_STD_UNKNOWN,
1136
1137 err = video_register_device(vdev, VFL_TYPE_GRABBER, vdev->minor);
1138 if (err < 0) {
1139 dev_err(vdev->parent, "video_register_device failed\n");
1140 goto evidregd;
1141 }
1142 icd->vdev = vdev;
1143
1144 return 0;
1145
1146 evidregd:
1147 video_device_release(vdev);
1148 evidallocd:
1149 return err;
1150 }
1151 EXPORT_SYMBOL(soc_camera_video_start);
1152
1153 /* Called from client .remove() methods with .video_lock held */
1154 void soc_camera_video_stop(struct soc_camera_device *icd)
1155 {
1156 struct video_device *vdev = icd->vdev;
1157
1158 dev_dbg(&icd->dev, "%s\n", __func__);
1159
1160 if (!icd->dev.parent || !vdev)
1161 return;
1162
1163 video_unregister_device(vdev);
1164 icd->vdev = NULL;
1165 }
1166 EXPORT_SYMBOL(soc_camera_video_stop);
1167
1168 static int __devinit soc_camera_pdrv_probe(struct platform_device *pdev)
1169 {
1170 struct soc_camera_link *icl = pdev->dev.platform_data;
1171 struct i2c_adapter *adap;
1172 struct i2c_client *client;
1173
1174 if (!icl)
1175 return -EINVAL;
1176
1177 adap = i2c_get_adapter(icl->i2c_adapter_id);
1178 if (!adap) {
1179 dev_warn(&pdev->dev, "Cannot get adapter #%d. No driver?\n",
1180 icl->i2c_adapter_id);
1181 /* -ENODEV and -ENXIO do not produce an error on probe()... */
1182 return -ENOENT;
1183 }
1184
1185 icl->board_info->platform_data = icl;
1186 client = i2c_new_device(adap, icl->board_info);
1187 if (!client) {
1188 i2c_put_adapter(adap);
1189 return -ENOMEM;
1190 }
1191
1192 platform_set_drvdata(pdev, client);
1193
1194 return 0;
1195 }
1196
1197 static int __devexit soc_camera_pdrv_remove(struct platform_device *pdev)
1198 {
1199 struct i2c_client *client = platform_get_drvdata(pdev);
1200
1201 if (!client)
1202 return -ENODEV;
1203
1204 i2c_unregister_device(client);
1205 i2c_put_adapter(client->adapter);
1206
1207 return 0;
1208 }
1209
1210 static struct platform_driver __refdata soc_camera_pdrv = {
1211 .probe = soc_camera_pdrv_probe,
1212 .remove = __devexit_p(soc_camera_pdrv_remove),
1213 .driver = {
1214 .name = "soc-camera-pdrv",
1215 .owner = THIS_MODULE,
1216 },
1217 };
1218
1219 static int __init soc_camera_init(void)
1220 {
1221 int ret = bus_register(&soc_camera_bus_type);
1222 if (ret)
1223 return ret;
1224 ret = driver_register(&ic_drv);
1225 if (ret)
1226 goto edrvr;
1227
1228 ret = platform_driver_register(&soc_camera_pdrv);
1229 if (ret)
1230 goto epdr;
1231
1232 return 0;
1233
1234 epdr:
1235 driver_unregister(&ic_drv);
1236 edrvr:
1237 bus_unregister(&soc_camera_bus_type);
1238 return ret;
1239 }
1240
1241 static void __exit soc_camera_exit(void)
1242 {
1243 platform_driver_unregister(&soc_camera_pdrv);
1244 driver_unregister(&ic_drv);
1245 bus_unregister(&soc_camera_bus_type);
1246 }
1247
1248 module_init(soc_camera_init);
1249 module_exit(soc_camera_exit);
1250
1251 MODULE_DESCRIPTION("Image capture bus driver");
1252 MODULE_AUTHOR("Guennadi Liakhovetski <kernel@pengutronix.de>");
1253 MODULE_LICENSE("GPL");
1254 MODULE_ALIAS("platform:soc-camera-pdrv");
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