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V4L/DVB (12529): soc-camera: switch to s_crop v4l2-subdev video operation
[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/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/mutex.h>
25 #include <linux/module.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-ioctl.h>
32 #include <media/v4l2-dev.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); /* Protects the list of hosts */
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 struct soc_camera_host *ici = to_soc_camera_host(icd->dev.parent);
156
157 return v4l2_device_call_until_err(&ici->v4l2_dev, (__u32)icd, core, s_std, *a);
158 }
159
160 static int soc_camera_reqbufs(struct file *file, void *priv,
161 struct v4l2_requestbuffers *p)
162 {
163 int ret;
164 struct soc_camera_file *icf = file->private_data;
165 struct soc_camera_device *icd = icf->icd;
166 struct soc_camera_host *ici = to_soc_camera_host(icd->dev.parent);
167
168 WARN_ON(priv != file->private_data);
169
170 ret = videobuf_reqbufs(&icf->vb_vidq, p);
171 if (ret < 0)
172 return ret;
173
174 return ici->ops->reqbufs(icf, p);
175 }
176
177 static int soc_camera_querybuf(struct file *file, void *priv,
178 struct v4l2_buffer *p)
179 {
180 struct soc_camera_file *icf = file->private_data;
181
182 WARN_ON(priv != file->private_data);
183
184 return videobuf_querybuf(&icf->vb_vidq, p);
185 }
186
187 static int soc_camera_qbuf(struct file *file, void *priv,
188 struct v4l2_buffer *p)
189 {
190 struct soc_camera_file *icf = file->private_data;
191
192 WARN_ON(priv != file->private_data);
193
194 return videobuf_qbuf(&icf->vb_vidq, p);
195 }
196
197 static int soc_camera_dqbuf(struct file *file, void *priv,
198 struct v4l2_buffer *p)
199 {
200 struct soc_camera_file *icf = file->private_data;
201
202 WARN_ON(priv != file->private_data);
203
204 return videobuf_dqbuf(&icf->vb_vidq, p, file->f_flags & O_NONBLOCK);
205 }
206
207 /* Always entered with .video_lock held */
208 static int soc_camera_init_user_formats(struct soc_camera_device *icd)
209 {
210 struct soc_camera_host *ici = to_soc_camera_host(icd->dev.parent);
211 int i, fmts = 0, ret;
212
213 if (!ici->ops->get_formats)
214 /*
215 * Fallback mode - the host will have to serve all
216 * sensor-provided formats one-to-one to the user
217 */
218 fmts = icd->num_formats;
219 else
220 /*
221 * First pass - only count formats this host-sensor
222 * configuration can provide
223 */
224 for (i = 0; i < icd->num_formats; i++) {
225 ret = ici->ops->get_formats(icd, i, NULL);
226 if (ret < 0)
227 return ret;
228 fmts += ret;
229 }
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 ret = ici->ops->get_formats(icd, i,
252 &icd->user_formats[fmts]);
253 if (ret < 0)
254 goto egfmt;
255 fmts += ret;
256 }
257
258 icd->current_fmt = icd->user_formats[0].host_fmt;
259
260 return 0;
261
262 egfmt:
263 icd->num_user_formats = 0;
264 vfree(icd->user_formats);
265 return ret;
266 }
267
268 /* Always entered with .video_lock held */
269 static void soc_camera_free_user_formats(struct soc_camera_device *icd)
270 {
271 struct soc_camera_host *ici = to_soc_camera_host(icd->dev.parent);
272
273 if (ici->ops->put_formats)
274 ici->ops->put_formats(icd);
275 icd->current_fmt = NULL;
276 icd->num_user_formats = 0;
277 vfree(icd->user_formats);
278 icd->user_formats = NULL;
279 }
280
281 /* Called with .vb_lock held */
282 static int soc_camera_set_fmt(struct soc_camera_file *icf,
283 struct v4l2_format *f)
284 {
285 struct soc_camera_device *icd = icf->icd;
286 struct soc_camera_host *ici = to_soc_camera_host(icd->dev.parent);
287 struct v4l2_pix_format *pix = &f->fmt.pix;
288 int ret;
289
290 /* We always call try_fmt() before set_fmt() or set_crop() */
291 ret = ici->ops->try_fmt(icd, f);
292 if (ret < 0)
293 return ret;
294
295 ret = ici->ops->set_fmt(icd, f);
296 if (ret < 0) {
297 return ret;
298 } else if (!icd->current_fmt ||
299 icd->current_fmt->fourcc != pix->pixelformat) {
300 dev_err(ici->v4l2_dev.dev,
301 "Host driver hasn't set up current format correctly!\n");
302 return -EINVAL;
303 }
304
305 icd->rect_current.width = pix->width;
306 icd->rect_current.height = pix->height;
307 icf->vb_vidq.field =
308 icd->field = pix->field;
309
310 if (f->type != V4L2_BUF_TYPE_VIDEO_CAPTURE)
311 dev_warn(&icd->dev, "Attention! Wrong buf-type %d\n",
312 f->type);
313
314 dev_dbg(&icd->dev, "set width: %d height: %d\n",
315 icd->rect_current.width, icd->rect_current.height);
316
317 /* set physical bus parameters */
318 return ici->ops->set_bus_param(icd, pix->pixelformat);
319 }
320
321 static int soc_camera_open(struct file *file)
322 {
323 struct video_device *vdev = video_devdata(file);
324 struct soc_camera_device *icd = container_of(vdev->parent, struct soc_camera_device, dev);
325 struct soc_camera_link *icl = to_soc_camera_link(icd);
326 struct soc_camera_host *ici;
327 struct soc_camera_file *icf;
328 int ret;
329
330 if (!icd->ops)
331 /* No device driver attached */
332 return -ENODEV;
333
334 ici = to_soc_camera_host(icd->dev.parent);
335
336 icf = vmalloc(sizeof(*icf));
337 if (!icf)
338 return -ENOMEM;
339
340 if (!try_module_get(ici->ops->owner)) {
341 dev_err(&icd->dev, "Couldn't lock capture bus driver.\n");
342 ret = -EINVAL;
343 goto emgi;
344 }
345
346 /* Protect against icd->ops->remove() until we module_get() both drivers. */
347 mutex_lock(&icd->video_lock);
348
349 icf->icd = icd;
350 icd->use_count++;
351
352 /* Now we really have to activate the camera */
353 if (icd->use_count == 1) {
354 /* Restore parameters before the last close() per V4L2 API */
355 struct v4l2_format f = {
356 .type = V4L2_BUF_TYPE_VIDEO_CAPTURE,
357 .fmt.pix = {
358 .width = icd->rect_current.width,
359 .height = icd->rect_current.height,
360 .field = icd->field,
361 .pixelformat = icd->current_fmt->fourcc,
362 .colorspace = icd->current_fmt->colorspace,
363 },
364 };
365
366 if (icl->power) {
367 ret = icl->power(icd->pdev, 1);
368 if (ret < 0)
369 goto epower;
370 }
371
372 /* The camera could have been already on, try to reset */
373 if (icl->reset)
374 icl->reset(icd->pdev);
375
376 ret = ici->ops->add(icd);
377 if (ret < 0) {
378 dev_err(&icd->dev, "Couldn't activate the camera: %d\n", ret);
379 goto eiciadd;
380 }
381
382 if (icd->ops->init) {
383 ret = icd->ops->init(icd);
384 if (ret < 0)
385 goto einit;
386 }
387
388 /* Try to configure with default parameters */
389 ret = soc_camera_set_fmt(icf, &f);
390 if (ret < 0)
391 goto esfmt;
392 }
393
394 file->private_data = icf;
395 dev_dbg(&icd->dev, "camera device open\n");
396
397 ici->ops->init_videobuf(&icf->vb_vidq, icd);
398
399 mutex_unlock(&icd->video_lock);
400
401 return 0;
402
403 /*
404 * First five errors are entered with the .video_lock held
405 * and use_count == 1
406 */
407 esfmt:
408 if (icd->ops->release)
409 icd->ops->release(icd);
410 einit:
411 ici->ops->remove(icd);
412 eiciadd:
413 if (icl->power)
414 icl->power(icd->pdev, 0);
415 epower:
416 icd->use_count--;
417 mutex_unlock(&icd->video_lock);
418 module_put(ici->ops->owner);
419 emgi:
420 vfree(icf);
421 return ret;
422 }
423
424 static int soc_camera_close(struct file *file)
425 {
426 struct soc_camera_file *icf = file->private_data;
427 struct soc_camera_device *icd = icf->icd;
428 struct soc_camera_host *ici = to_soc_camera_host(icd->dev.parent);
429 struct video_device *vdev = icd->vdev;
430
431 mutex_lock(&icd->video_lock);
432 icd->use_count--;
433 if (!icd->use_count) {
434 struct soc_camera_link *icl = to_soc_camera_link(icd);
435
436 if (icd->ops->release)
437 icd->ops->release(icd);
438 ici->ops->remove(icd);
439 if (icl->power)
440 icl->power(icd->pdev, 0);
441 }
442
443 mutex_unlock(&icd->video_lock);
444
445 module_put(ici->ops->owner);
446
447 vfree(icf);
448
449 dev_dbg(vdev->parent, "camera device close\n");
450
451 return 0;
452 }
453
454 static ssize_t soc_camera_read(struct file *file, char __user *buf,
455 size_t count, loff_t *ppos)
456 {
457 struct soc_camera_file *icf = file->private_data;
458 struct soc_camera_device *icd = icf->icd;
459 struct video_device *vdev = icd->vdev;
460 int err = -EINVAL;
461
462 dev_err(vdev->parent, "camera device read not implemented\n");
463
464 return err;
465 }
466
467 static int soc_camera_mmap(struct file *file, struct vm_area_struct *vma)
468 {
469 struct soc_camera_file *icf = file->private_data;
470 struct soc_camera_device *icd = icf->icd;
471 int err;
472
473 dev_dbg(&icd->dev, "mmap called, vma=0x%08lx\n", (unsigned long)vma);
474
475 err = videobuf_mmap_mapper(&icf->vb_vidq, vma);
476
477 dev_dbg(&icd->dev, "vma start=0x%08lx, size=%ld, ret=%d\n",
478 (unsigned long)vma->vm_start,
479 (unsigned long)vma->vm_end - (unsigned long)vma->vm_start,
480 err);
481
482 return err;
483 }
484
485 static unsigned int soc_camera_poll(struct file *file, poll_table *pt)
486 {
487 struct soc_camera_file *icf = file->private_data;
488 struct soc_camera_device *icd = icf->icd;
489 struct soc_camera_host *ici = to_soc_camera_host(icd->dev.parent);
490
491 if (list_empty(&icf->vb_vidq.stream)) {
492 dev_err(&icd->dev, "Trying to poll with no queued buffers!\n");
493 return POLLERR;
494 }
495
496 return ici->ops->poll(file, pt);
497 }
498
499 static struct v4l2_file_operations soc_camera_fops = {
500 .owner = THIS_MODULE,
501 .open = soc_camera_open,
502 .release = soc_camera_close,
503 .ioctl = video_ioctl2,
504 .read = soc_camera_read,
505 .mmap = soc_camera_mmap,
506 .poll = soc_camera_poll,
507 };
508
509 static int soc_camera_s_fmt_vid_cap(struct file *file, void *priv,
510 struct v4l2_format *f)
511 {
512 struct soc_camera_file *icf = file->private_data;
513 struct soc_camera_device *icd = icf->icd;
514 int ret;
515
516 WARN_ON(priv != file->private_data);
517
518 mutex_lock(&icf->vb_vidq.vb_lock);
519
520 if (icf->vb_vidq.bufs[0]) {
521 dev_err(&icd->dev, "S_FMT denied: queue initialised\n");
522 ret = -EBUSY;
523 goto unlock;
524 }
525
526 ret = soc_camera_set_fmt(icf, f);
527
528 unlock:
529 mutex_unlock(&icf->vb_vidq.vb_lock);
530
531 return ret;
532 }
533
534 static int soc_camera_enum_fmt_vid_cap(struct file *file, void *priv,
535 struct v4l2_fmtdesc *f)
536 {
537 struct soc_camera_file *icf = file->private_data;
538 struct soc_camera_device *icd = icf->icd;
539 const struct soc_camera_data_format *format;
540
541 WARN_ON(priv != file->private_data);
542
543 if (f->index >= icd->num_user_formats)
544 return -EINVAL;
545
546 format = icd->user_formats[f->index].host_fmt;
547
548 strlcpy(f->description, format->name, sizeof(f->description));
549 f->pixelformat = format->fourcc;
550 return 0;
551 }
552
553 static int soc_camera_g_fmt_vid_cap(struct file *file, void *priv,
554 struct v4l2_format *f)
555 {
556 struct soc_camera_file *icf = file->private_data;
557 struct soc_camera_device *icd = icf->icd;
558 struct v4l2_pix_format *pix = &f->fmt.pix;
559
560 WARN_ON(priv != file->private_data);
561
562 pix->width = icd->rect_current.width;
563 pix->height = icd->rect_current.height;
564 pix->field = icf->vb_vidq.field;
565 pix->pixelformat = icd->current_fmt->fourcc;
566 pix->bytesperline = pix->width *
567 DIV_ROUND_UP(icd->current_fmt->depth, 8);
568 pix->sizeimage = pix->height * pix->bytesperline;
569 dev_dbg(&icd->dev, "current_fmt->fourcc: 0x%08x\n",
570 icd->current_fmt->fourcc);
571 return 0;
572 }
573
574 static int soc_camera_querycap(struct file *file, void *priv,
575 struct v4l2_capability *cap)
576 {
577 struct soc_camera_file *icf = file->private_data;
578 struct soc_camera_device *icd = icf->icd;
579 struct soc_camera_host *ici = to_soc_camera_host(icd->dev.parent);
580
581 WARN_ON(priv != file->private_data);
582
583 strlcpy(cap->driver, ici->drv_name, sizeof(cap->driver));
584 return ici->ops->querycap(ici, cap);
585 }
586
587 static int soc_camera_streamon(struct file *file, void *priv,
588 enum v4l2_buf_type i)
589 {
590 struct soc_camera_file *icf = file->private_data;
591 struct soc_camera_device *icd = icf->icd;
592 struct soc_camera_host *ici = to_soc_camera_host(icd->dev.parent);
593 int ret;
594
595 WARN_ON(priv != file->private_data);
596
597 if (i != V4L2_BUF_TYPE_VIDEO_CAPTURE)
598 return -EINVAL;
599
600 mutex_lock(&icd->video_lock);
601
602 v4l2_device_call_until_err(&ici->v4l2_dev, (__u32)icd, video, s_stream, 1);
603
604 /* This calls buf_queue from host driver's videobuf_queue_ops */
605 ret = videobuf_streamon(&icf->vb_vidq);
606
607 mutex_unlock(&icd->video_lock);
608
609 return ret;
610 }
611
612 static int soc_camera_streamoff(struct file *file, void *priv,
613 enum v4l2_buf_type i)
614 {
615 struct soc_camera_file *icf = file->private_data;
616 struct soc_camera_device *icd = icf->icd;
617 struct soc_camera_host *ici = to_soc_camera_host(icd->dev.parent);
618
619 WARN_ON(priv != file->private_data);
620
621 if (i != V4L2_BUF_TYPE_VIDEO_CAPTURE)
622 return -EINVAL;
623
624 mutex_lock(&icd->video_lock);
625
626 /* This calls buf_release from host driver's videobuf_queue_ops for all
627 * remaining buffers. When the last buffer is freed, stop capture */
628 videobuf_streamoff(&icf->vb_vidq);
629
630 v4l2_device_call_until_err(&ici->v4l2_dev, (__u32)icd, video, s_stream, 0);
631
632 mutex_unlock(&icd->video_lock);
633
634 return 0;
635 }
636
637 static int soc_camera_queryctrl(struct file *file, void *priv,
638 struct v4l2_queryctrl *qc)
639 {
640 struct soc_camera_file *icf = file->private_data;
641 struct soc_camera_device *icd = icf->icd;
642 struct soc_camera_host *ici = to_soc_camera_host(icd->dev.parent);
643 int i;
644
645 WARN_ON(priv != file->private_data);
646
647 if (!qc->id)
648 return -EINVAL;
649
650 /* First check host controls */
651 for (i = 0; i < ici->ops->num_controls; i++)
652 if (qc->id == ici->ops->controls[i].id) {
653 memcpy(qc, &(ici->ops->controls[i]),
654 sizeof(*qc));
655 return 0;
656 }
657
658 /* Then device controls */
659 for (i = 0; i < icd->ops->num_controls; i++)
660 if (qc->id == icd->ops->controls[i].id) {
661 memcpy(qc, &(icd->ops->controls[i]),
662 sizeof(*qc));
663 return 0;
664 }
665
666 return -EINVAL;
667 }
668
669 static int soc_camera_g_ctrl(struct file *file, void *priv,
670 struct v4l2_control *ctrl)
671 {
672 struct soc_camera_file *icf = file->private_data;
673 struct soc_camera_device *icd = icf->icd;
674 struct soc_camera_host *ici = to_soc_camera_host(icd->dev.parent);
675 int ret;
676
677 WARN_ON(priv != file->private_data);
678
679 switch (ctrl->id) {
680 case V4L2_CID_GAIN:
681 if (icd->gain == (unsigned short)~0)
682 return -EINVAL;
683 ctrl->value = icd->gain;
684 return 0;
685 case V4L2_CID_EXPOSURE:
686 if (icd->exposure == (unsigned short)~0)
687 return -EINVAL;
688 ctrl->value = icd->exposure;
689 return 0;
690 }
691
692 if (ici->ops->get_ctrl) {
693 ret = ici->ops->get_ctrl(icd, ctrl);
694 if (ret != -ENOIOCTLCMD)
695 return ret;
696 }
697
698 return v4l2_device_call_until_err(&ici->v4l2_dev, (__u32)icd, core, g_ctrl, ctrl);
699 }
700
701 static int soc_camera_s_ctrl(struct file *file, void *priv,
702 struct v4l2_control *ctrl)
703 {
704 struct soc_camera_file *icf = file->private_data;
705 struct soc_camera_device *icd = icf->icd;
706 struct soc_camera_host *ici = to_soc_camera_host(icd->dev.parent);
707 int ret;
708
709 WARN_ON(priv != file->private_data);
710
711 if (ici->ops->set_ctrl) {
712 ret = ici->ops->set_ctrl(icd, ctrl);
713 if (ret != -ENOIOCTLCMD)
714 return ret;
715 }
716
717 return v4l2_device_call_until_err(&ici->v4l2_dev, (__u32)icd, core, s_ctrl, ctrl);
718 }
719
720 static int soc_camera_cropcap(struct file *file, void *fh,
721 struct v4l2_cropcap *a)
722 {
723 struct soc_camera_file *icf = file->private_data;
724 struct soc_camera_device *icd = icf->icd;
725
726 a->type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
727 a->bounds = icd->rect_max;
728 a->defrect.left = icd->rect_max.left;
729 a->defrect.top = icd->rect_max.top;
730 a->defrect.width = DEFAULT_WIDTH;
731 a->defrect.height = DEFAULT_HEIGHT;
732 a->pixelaspect.numerator = 1;
733 a->pixelaspect.denominator = 1;
734
735 return 0;
736 }
737
738 static int soc_camera_g_crop(struct file *file, void *fh,
739 struct v4l2_crop *a)
740 {
741 struct soc_camera_file *icf = file->private_data;
742 struct soc_camera_device *icd = icf->icd;
743
744 a->type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
745 a->c = icd->rect_current;
746
747 return 0;
748 }
749
750 /*
751 * According to the V4L2 API, drivers shall not update the struct v4l2_crop
752 * argument with the actual geometry, instead, the user shall use G_CROP to
753 * retrieve it. However, we expect camera host and client drivers to update
754 * the argument, which we then use internally, but do not return to the user.
755 */
756 static int soc_camera_s_crop(struct file *file, void *fh,
757 struct v4l2_crop *a)
758 {
759 struct soc_camera_file *icf = file->private_data;
760 struct soc_camera_device *icd = icf->icd;
761 struct soc_camera_host *ici = to_soc_camera_host(icd->dev.parent);
762 struct v4l2_rect rect = a->c;
763 int ret;
764
765 if (a->type != V4L2_BUF_TYPE_VIDEO_CAPTURE)
766 return -EINVAL;
767
768 /* Cropping is allowed during a running capture, guard consistency */
769 mutex_lock(&icf->vb_vidq.vb_lock);
770
771 /* Prohibit window size change with initialised buffers */
772 if (icf->vb_vidq.bufs[0] && (rect.width != icd->rect_current.width ||
773 rect.height != icd->rect_current.height)) {
774 dev_err(&icd->dev,
775 "S_CROP denied: queue initialised and sizes differ\n");
776 ret = -EBUSY;
777 goto unlock;
778 }
779
780 if (rect.width > icd->rect_max.width)
781 rect.width = icd->rect_max.width;
782
783 if (rect.width < icd->width_min)
784 rect.width = icd->width_min;
785
786 if (rect.height > icd->rect_max.height)
787 rect.height = icd->rect_max.height;
788
789 if (rect.height < icd->height_min)
790 rect.height = icd->height_min;
791
792 if (rect.width + rect.left > icd->rect_max.width + icd->rect_max.left)
793 rect.left = icd->rect_max.width + icd->rect_max.left -
794 rect.width;
795
796 if (rect.height + rect.top > icd->rect_max.height + icd->rect_max.top)
797 rect.top = icd->rect_max.height + icd->rect_max.top -
798 rect.height;
799
800 ret = ici->ops->set_crop(icd, a);
801 if (!ret)
802 icd->rect_current = rect;
803
804 unlock:
805 mutex_unlock(&icf->vb_vidq.vb_lock);
806
807 return ret;
808 }
809
810 static int soc_camera_g_chip_ident(struct file *file, void *fh,
811 struct v4l2_dbg_chip_ident *id)
812 {
813 struct soc_camera_file *icf = file->private_data;
814 struct soc_camera_device *icd = icf->icd;
815 struct soc_camera_host *ici = to_soc_camera_host(icd->dev.parent);
816
817 return v4l2_device_call_until_err(&ici->v4l2_dev, (__u32)icd, core, g_chip_ident, id);
818 }
819
820 #ifdef CONFIG_VIDEO_ADV_DEBUG
821 static int soc_camera_g_register(struct file *file, void *fh,
822 struct v4l2_dbg_register *reg)
823 {
824 struct soc_camera_file *icf = file->private_data;
825 struct soc_camera_device *icd = icf->icd;
826 struct soc_camera_host *ici = to_soc_camera_host(icd->dev.parent);
827
828 return v4l2_device_call_until_err(&ici->v4l2_dev, (__u32)icd, core, g_register, reg);
829 }
830
831 static int soc_camera_s_register(struct file *file, void *fh,
832 struct v4l2_dbg_register *reg)
833 {
834 struct soc_camera_file *icf = file->private_data;
835 struct soc_camera_device *icd = icf->icd;
836 struct soc_camera_host *ici = to_soc_camera_host(icd->dev.parent);
837
838 return v4l2_device_call_until_err(&ici->v4l2_dev, (__u32)icd, core, s_register, reg);
839 }
840 #endif
841
842 /* So far this function cannot fail */
843 static void scan_add_host(struct soc_camera_host *ici)
844 {
845 struct soc_camera_device *icd;
846
847 mutex_lock(&list_lock);
848
849 list_for_each_entry(icd, &devices, list) {
850 if (icd->iface == ici->nr) {
851 int ret;
852 icd->dev.parent = ici->v4l2_dev.dev;
853 dev_set_name(&icd->dev, "%u-%u", icd->iface,
854 icd->devnum);
855 ret = device_register(&icd->dev);
856 if (ret < 0) {
857 icd->dev.parent = NULL;
858 dev_err(&icd->dev,
859 "Cannot register device: %d\n", ret);
860 }
861 }
862 }
863
864 mutex_unlock(&list_lock);
865 }
866
867 #ifdef CONFIG_I2C_BOARDINFO
868 static int soc_camera_init_i2c(struct soc_camera_device *icd,
869 struct soc_camera_link *icl)
870 {
871 struct i2c_client *client;
872 struct soc_camera_host *ici = to_soc_camera_host(icd->dev.parent);
873 struct i2c_adapter *adap = i2c_get_adapter(icl->i2c_adapter_id);
874 struct v4l2_subdev *subdev;
875 int ret;
876
877 if (!adap) {
878 ret = -ENODEV;
879 dev_err(&icd->dev, "Cannot get I2C adapter #%d. No driver?\n",
880 icl->i2c_adapter_id);
881 goto ei2cga;
882 }
883
884 icl->board_info->platform_data = icd;
885
886 subdev = v4l2_i2c_new_subdev_board(&ici->v4l2_dev, adap,
887 icl->module_name, icl->board_info, NULL);
888 if (!subdev) {
889 ret = -ENOMEM;
890 goto ei2cnd;
891 }
892
893 subdev->grp_id = (__u32)icd;
894 client = subdev->priv;
895
896 /* Use to_i2c_client(dev) to recover the i2c client */
897 dev_set_drvdata(&icd->dev, &client->dev);
898
899 return 0;
900 ei2cnd:
901 i2c_put_adapter(adap);
902 ei2cga:
903 return ret;
904 }
905
906 static void soc_camera_free_i2c(struct soc_camera_device *icd)
907 {
908 struct i2c_client *client =
909 to_i2c_client(to_soc_camera_control(icd));
910 dev_set_drvdata(&icd->dev, NULL);
911 v4l2_device_unregister_subdev(i2c_get_clientdata(client));
912 i2c_unregister_device(client);
913 i2c_put_adapter(client->adapter);
914 }
915 #else
916 #define soc_camera_init_i2c(icd, icl) (-ENODEV)
917 #define soc_camera_free_i2c(icd) do {} while (0)
918 #endif
919
920 static int soc_camera_video_start(struct soc_camera_device *icd);
921 static int video_dev_create(struct soc_camera_device *icd);
922 /* Called during host-driver probe */
923 static int soc_camera_probe(struct device *dev)
924 {
925 struct soc_camera_device *icd = to_soc_camera_dev(dev);
926 struct soc_camera_host *ici = to_soc_camera_host(dev->parent);
927 struct soc_camera_link *icl = to_soc_camera_link(icd);
928 struct device *control = NULL;
929 int ret;
930
931 dev_info(dev, "Probing %s\n", dev_name(dev));
932
933 if (icl->power) {
934 ret = icl->power(icd->pdev, 1);
935 if (ret < 0) {
936 dev_err(dev,
937 "Platform failed to power-on the camera.\n");
938 goto epower;
939 }
940 }
941
942 /* The camera could have been already on, try to reset */
943 if (icl->reset)
944 icl->reset(icd->pdev);
945
946 ret = ici->ops->add(icd);
947 if (ret < 0)
948 goto eadd;
949
950 /* Must have icd->vdev before registering the device */
951 ret = video_dev_create(icd);
952 if (ret < 0)
953 goto evdc;
954
955 /* Non-i2c cameras, e.g., soc_camera_platform, have no board_info */
956 if (icl->board_info) {
957 ret = soc_camera_init_i2c(icd, icl);
958 if (ret < 0)
959 goto eadddev;
960 } else if (!icl->add_device || !icl->del_device) {
961 ret = -EINVAL;
962 goto eadddev;
963 } else {
964 if (icl->module_name)
965 ret = request_module(icl->module_name);
966
967 ret = icl->add_device(icl, &icd->dev);
968 if (ret < 0)
969 goto eadddev;
970
971 /* FIXME: this is racy, have to use driver-binding notification */
972 control = to_soc_camera_control(icd);
973 if (!control || !control->driver || !dev_get_drvdata(control) ||
974 !try_module_get(control->driver->owner)) {
975 icl->del_device(icl);
976 goto enodrv;
977 }
978 }
979
980 /* At this point client .probe() should have run already */
981 ret = soc_camera_init_user_formats(icd);
982 if (ret < 0)
983 goto eiufmt;
984
985 icd->rect_current = icd->rect_max;
986 icd->field = V4L2_FIELD_ANY;
987
988 /* ..._video_start() will create a device node, so we have to protect */
989 mutex_lock(&icd->video_lock);
990
991 ret = soc_camera_video_start(icd);
992 if (ret < 0)
993 goto evidstart;
994
995 /* Do we have to sysfs_remove_link() before device_unregister()? */
996 if (to_soc_camera_control(icd) &&
997 sysfs_create_link(&icd->dev.kobj, &to_soc_camera_control(icd)->kobj,
998 "control"))
999 dev_warn(&icd->dev, "Failed creating the control symlink\n");
1000
1001 ici->ops->remove(icd);
1002
1003 if (icl->power)
1004 icl->power(icd->pdev, 0);
1005
1006 mutex_unlock(&icd->video_lock);
1007
1008 return 0;
1009
1010 evidstart:
1011 mutex_unlock(&icd->video_lock);
1012 soc_camera_free_user_formats(icd);
1013 eiufmt:
1014 if (icl->board_info) {
1015 soc_camera_free_i2c(icd);
1016 } else {
1017 icl->del_device(icl);
1018 module_put(control->driver->owner);
1019 }
1020 enodrv:
1021 eadddev:
1022 video_device_release(icd->vdev);
1023 evdc:
1024 ici->ops->remove(icd);
1025 eadd:
1026 if (icl->power)
1027 icl->power(icd->pdev, 0);
1028 epower:
1029 return ret;
1030 }
1031
1032 /* This is called on device_unregister, which only means we have to disconnect
1033 * from the host, but not remove ourselves from the device list */
1034 static int soc_camera_remove(struct device *dev)
1035 {
1036 struct soc_camera_device *icd = to_soc_camera_dev(dev);
1037 struct soc_camera_link *icl = to_soc_camera_link(icd);
1038 struct video_device *vdev = icd->vdev;
1039
1040 BUG_ON(!dev->parent);
1041
1042 if (vdev) {
1043 mutex_lock(&icd->video_lock);
1044 video_unregister_device(vdev);
1045 icd->vdev = NULL;
1046 mutex_unlock(&icd->video_lock);
1047 }
1048
1049 if (icl->board_info) {
1050 soc_camera_free_i2c(icd);
1051 } else {
1052 struct device_driver *drv = to_soc_camera_control(icd) ?
1053 to_soc_camera_control(icd)->driver : NULL;
1054 if (drv) {
1055 icl->del_device(icl);
1056 module_put(drv->owner);
1057 }
1058 }
1059 soc_camera_free_user_formats(icd);
1060
1061 return 0;
1062 }
1063
1064 static int soc_camera_suspend(struct device *dev, pm_message_t state)
1065 {
1066 struct soc_camera_device *icd = to_soc_camera_dev(dev);
1067 struct soc_camera_host *ici = to_soc_camera_host(icd->dev.parent);
1068 int ret = 0;
1069
1070 if (ici->ops->suspend)
1071 ret = ici->ops->suspend(icd, state);
1072
1073 return ret;
1074 }
1075
1076 static int soc_camera_resume(struct device *dev)
1077 {
1078 struct soc_camera_device *icd = to_soc_camera_dev(dev);
1079 struct soc_camera_host *ici = to_soc_camera_host(icd->dev.parent);
1080 int ret = 0;
1081
1082 if (ici->ops->resume)
1083 ret = ici->ops->resume(icd);
1084
1085 return ret;
1086 }
1087
1088 static struct bus_type soc_camera_bus_type = {
1089 .name = "soc-camera",
1090 .probe = soc_camera_probe,
1091 .remove = soc_camera_remove,
1092 .suspend = soc_camera_suspend,
1093 .resume = soc_camera_resume,
1094 };
1095
1096 static struct device_driver ic_drv = {
1097 .name = "camera",
1098 .bus = &soc_camera_bus_type,
1099 .owner = THIS_MODULE,
1100 };
1101
1102 static void dummy_release(struct device *dev)
1103 {
1104 }
1105
1106 int soc_camera_host_register(struct soc_camera_host *ici)
1107 {
1108 struct soc_camera_host *ix;
1109 int ret;
1110
1111 if (!ici || !ici->ops ||
1112 !ici->ops->try_fmt ||
1113 !ici->ops->set_fmt ||
1114 !ici->ops->set_crop ||
1115 !ici->ops->set_bus_param ||
1116 !ici->ops->querycap ||
1117 !ici->ops->init_videobuf ||
1118 !ici->ops->reqbufs ||
1119 !ici->ops->add ||
1120 !ici->ops->remove ||
1121 !ici->ops->poll ||
1122 !ici->v4l2_dev.dev)
1123 return -EINVAL;
1124
1125 mutex_lock(&list_lock);
1126 list_for_each_entry(ix, &hosts, list) {
1127 if (ix->nr == ici->nr) {
1128 ret = -EBUSY;
1129 goto edevreg;
1130 }
1131 }
1132
1133 ret = v4l2_device_register(ici->v4l2_dev.dev, &ici->v4l2_dev);
1134 if (ret < 0)
1135 goto edevreg;
1136
1137 list_add_tail(&ici->list, &hosts);
1138 mutex_unlock(&list_lock);
1139
1140 scan_add_host(ici);
1141
1142 return 0;
1143
1144 edevreg:
1145 mutex_unlock(&list_lock);
1146 return ret;
1147 }
1148 EXPORT_SYMBOL(soc_camera_host_register);
1149
1150 /* Unregister all clients! */
1151 void soc_camera_host_unregister(struct soc_camera_host *ici)
1152 {
1153 struct soc_camera_device *icd;
1154
1155 mutex_lock(&list_lock);
1156
1157 list_del(&ici->list);
1158
1159 list_for_each_entry(icd, &devices, list) {
1160 if (icd->iface == ici->nr) {
1161 /* The bus->remove will be called */
1162 device_unregister(&icd->dev);
1163 /* Not before device_unregister(), .remove
1164 * needs parent to call ici->ops->remove() */
1165 icd->dev.parent = NULL;
1166
1167 /* If the host module is loaded again, device_register()
1168 * would complain "already initialised" */
1169 memset(&icd->dev.kobj, 0, sizeof(icd->dev.kobj));
1170 }
1171 }
1172
1173 mutex_unlock(&list_lock);
1174
1175 v4l2_device_unregister(&ici->v4l2_dev);
1176 }
1177 EXPORT_SYMBOL(soc_camera_host_unregister);
1178
1179 /* Image capture device */
1180 static int soc_camera_device_register(struct soc_camera_device *icd)
1181 {
1182 struct soc_camera_device *ix;
1183 int num = -1, i;
1184
1185 for (i = 0; i < 256 && num < 0; i++) {
1186 num = i;
1187 /* Check if this index is available on this interface */
1188 list_for_each_entry(ix, &devices, list) {
1189 if (ix->iface == icd->iface && ix->devnum == i) {
1190 num = -1;
1191 break;
1192 }
1193 }
1194 }
1195
1196 if (num < 0)
1197 /* ok, we have 256 cameras on this host...
1198 * man, stay reasonable... */
1199 return -ENOMEM;
1200
1201 icd->devnum = num;
1202 icd->dev.bus = &soc_camera_bus_type;
1203
1204 icd->dev.release = dummy_release;
1205 icd->use_count = 0;
1206 icd->host_priv = NULL;
1207 mutex_init(&icd->video_lock);
1208
1209 list_add_tail(&icd->list, &devices);
1210
1211 return 0;
1212 }
1213
1214 static void soc_camera_device_unregister(struct soc_camera_device *icd)
1215 {
1216 list_del(&icd->list);
1217 }
1218
1219 static const struct v4l2_ioctl_ops soc_camera_ioctl_ops = {
1220 .vidioc_querycap = soc_camera_querycap,
1221 .vidioc_g_fmt_vid_cap = soc_camera_g_fmt_vid_cap,
1222 .vidioc_enum_fmt_vid_cap = soc_camera_enum_fmt_vid_cap,
1223 .vidioc_s_fmt_vid_cap = soc_camera_s_fmt_vid_cap,
1224 .vidioc_enum_input = soc_camera_enum_input,
1225 .vidioc_g_input = soc_camera_g_input,
1226 .vidioc_s_input = soc_camera_s_input,
1227 .vidioc_s_std = soc_camera_s_std,
1228 .vidioc_reqbufs = soc_camera_reqbufs,
1229 .vidioc_try_fmt_vid_cap = soc_camera_try_fmt_vid_cap,
1230 .vidioc_querybuf = soc_camera_querybuf,
1231 .vidioc_qbuf = soc_camera_qbuf,
1232 .vidioc_dqbuf = soc_camera_dqbuf,
1233 .vidioc_streamon = soc_camera_streamon,
1234 .vidioc_streamoff = soc_camera_streamoff,
1235 .vidioc_queryctrl = soc_camera_queryctrl,
1236 .vidioc_g_ctrl = soc_camera_g_ctrl,
1237 .vidioc_s_ctrl = soc_camera_s_ctrl,
1238 .vidioc_cropcap = soc_camera_cropcap,
1239 .vidioc_g_crop = soc_camera_g_crop,
1240 .vidioc_s_crop = soc_camera_s_crop,
1241 .vidioc_g_chip_ident = soc_camera_g_chip_ident,
1242 #ifdef CONFIG_VIDEO_ADV_DEBUG
1243 .vidioc_g_register = soc_camera_g_register,
1244 .vidioc_s_register = soc_camera_s_register,
1245 #endif
1246 };
1247
1248 static int video_dev_create(struct soc_camera_device *icd)
1249 {
1250 struct soc_camera_host *ici = to_soc_camera_host(icd->dev.parent);
1251 struct video_device *vdev = video_device_alloc();
1252
1253 if (!vdev)
1254 return -ENOMEM;
1255
1256 strlcpy(vdev->name, ici->drv_name, sizeof(vdev->name));
1257
1258 vdev->parent = &icd->dev;
1259 vdev->current_norm = V4L2_STD_UNKNOWN;
1260 vdev->fops = &soc_camera_fops;
1261 vdev->ioctl_ops = &soc_camera_ioctl_ops;
1262 vdev->release = video_device_release;
1263 vdev->minor = -1;
1264 vdev->tvnorms = V4L2_STD_UNKNOWN;
1265
1266 icd->vdev = vdev;
1267
1268 return 0;
1269 }
1270
1271 /*
1272 * Called from soc_camera_probe() above (with .video_lock held???)
1273 */
1274 static int soc_camera_video_start(struct soc_camera_device *icd)
1275 {
1276 const struct v4l2_queryctrl *qctrl;
1277 int ret;
1278
1279 if (!icd->dev.parent)
1280 return -ENODEV;
1281
1282 if (!icd->ops ||
1283 !icd->ops->query_bus_param ||
1284 !icd->ops->set_bus_param)
1285 return -EINVAL;
1286
1287 ret = video_register_device(icd->vdev, VFL_TYPE_GRABBER,
1288 icd->vdev->minor);
1289 if (ret < 0) {
1290 dev_err(&icd->dev, "video_register_device failed: %d\n", ret);
1291 return ret;
1292 }
1293
1294 qctrl = soc_camera_find_qctrl(icd->ops, V4L2_CID_GAIN);
1295 icd->gain = qctrl ? qctrl->default_value : (unsigned short)~0;
1296 qctrl = soc_camera_find_qctrl(icd->ops, V4L2_CID_EXPOSURE);
1297 icd->exposure = qctrl ? qctrl->default_value : (unsigned short)~0;
1298
1299 return 0;
1300 }
1301
1302 static int __devinit soc_camera_pdrv_probe(struct platform_device *pdev)
1303 {
1304 struct soc_camera_link *icl = pdev->dev.platform_data;
1305 struct soc_camera_device *icd;
1306 int ret;
1307
1308 if (!icl)
1309 return -EINVAL;
1310
1311 icd = kzalloc(sizeof(*icd), GFP_KERNEL);
1312 if (!icd)
1313 return -ENOMEM;
1314
1315 icd->iface = icl->bus_id;
1316 icd->pdev = &pdev->dev;
1317 platform_set_drvdata(pdev, icd);
1318 icd->dev.platform_data = icl;
1319
1320 ret = soc_camera_device_register(icd);
1321 if (ret < 0)
1322 goto escdevreg;
1323
1324 return 0;
1325
1326 escdevreg:
1327 kfree(icd);
1328
1329 return ret;
1330 }
1331
1332 /* Only called on rmmod for each platform device, since they are not
1333 * hot-pluggable. Now we know, that all our users - hosts and devices have
1334 * been unloaded already */
1335 static int __devexit soc_camera_pdrv_remove(struct platform_device *pdev)
1336 {
1337 struct soc_camera_device *icd = platform_get_drvdata(pdev);
1338
1339 if (!icd)
1340 return -EINVAL;
1341
1342 soc_camera_device_unregister(icd);
1343
1344 kfree(icd);
1345
1346 return 0;
1347 }
1348
1349 static struct platform_driver __refdata soc_camera_pdrv = {
1350 .remove = __devexit_p(soc_camera_pdrv_remove),
1351 .driver = {
1352 .name = "soc-camera-pdrv",
1353 .owner = THIS_MODULE,
1354 },
1355 };
1356
1357 static int __init soc_camera_init(void)
1358 {
1359 int ret = bus_register(&soc_camera_bus_type);
1360 if (ret)
1361 return ret;
1362 ret = driver_register(&ic_drv);
1363 if (ret)
1364 goto edrvr;
1365
1366 ret = platform_driver_probe(&soc_camera_pdrv, soc_camera_pdrv_probe);
1367 if (ret)
1368 goto epdr;
1369
1370 return 0;
1371
1372 epdr:
1373 driver_unregister(&ic_drv);
1374 edrvr:
1375 bus_unregister(&soc_camera_bus_type);
1376 return ret;
1377 }
1378
1379 static void __exit soc_camera_exit(void)
1380 {
1381 platform_driver_unregister(&soc_camera_pdrv);
1382 driver_unregister(&ic_drv);
1383 bus_unregister(&soc_camera_bus_type);
1384 }
1385
1386 module_init(soc_camera_init);
1387 module_exit(soc_camera_exit);
1388
1389 MODULE_DESCRIPTION("Image capture bus driver");
1390 MODULE_AUTHOR("Guennadi Liakhovetski <kernel@pengutronix.de>");
1391 MODULE_LICENSE("GPL");
1392 MODULE_ALIAS("platform:soc-camera-pdrv");
Linux kernel - Deliverables
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