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OMAP3 SRF: Generic shared resource f/w
[linux-ginger.git] / drivers / media / video / soc_camera.c
blob59aa7a3694c2f2300b9cb4616ec6177f175edb55
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 v4l2_subdev *sd = soc_camera_to_subdev(icd);
156
157 return v4l2_subdev_call(sd, 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 #define pixfmtstr(x) (x) & 0xff, ((x) >> 8) & 0xff, ((x) >> 16) & 0xff, \
282 ((x) >> 24) & 0xff
283
284 /* Called with .vb_lock held */
285 static int soc_camera_set_fmt(struct soc_camera_file *icf,
286 struct v4l2_format *f)
287 {
288 struct soc_camera_device *icd = icf->icd;
289 struct soc_camera_host *ici = to_soc_camera_host(icd->dev.parent);
290 struct v4l2_pix_format *pix = &f->fmt.pix;
291 int ret;
292
293 dev_dbg(&icd->dev, "S_FMT(%c%c%c%c, %ux%u)\n",
294 pixfmtstr(pix->pixelformat), pix->width, pix->height);
295
296 /* We always call try_fmt() before set_fmt() or set_crop() */
297 ret = ici->ops->try_fmt(icd, f);
298 if (ret < 0)
299 return ret;
300
301 ret = ici->ops->set_fmt(icd, f);
302 if (ret < 0) {
303 return ret;
304 } else if (!icd->current_fmt ||
305 icd->current_fmt->fourcc != pix->pixelformat) {
306 dev_err(&icd->dev,
307 "Host driver hasn't set up current format correctly!\n");
308 return -EINVAL;
309 }
310
311 icd->user_width = pix->width;
312 icd->user_height = pix->height;
313 icf->vb_vidq.field =
314 icd->field = pix->field;
315
316 if (f->type != V4L2_BUF_TYPE_VIDEO_CAPTURE)
317 dev_warn(&icd->dev, "Attention! Wrong buf-type %d\n",
318 f->type);
319
320 dev_dbg(&icd->dev, "set width: %d height: %d\n",
321 icd->user_width, icd->user_height);
322
323 /* set physical bus parameters */
324 return ici->ops->set_bus_param(icd, pix->pixelformat);
325 }
326
327 static int soc_camera_open(struct file *file)
328 {
329 struct video_device *vdev = video_devdata(file);
330 struct soc_camera_device *icd = container_of(vdev->parent,
331 struct soc_camera_device,
332 dev);
333 struct soc_camera_link *icl = to_soc_camera_link(icd);
334 struct soc_camera_host *ici;
335 struct soc_camera_file *icf;
336 int ret;
337
338 if (!icd->ops)
339 /* No device driver attached */
340 return -ENODEV;
341
342 ici = to_soc_camera_host(icd->dev.parent);
343
344 icf = vmalloc(sizeof(*icf));
345 if (!icf)
346 return -ENOMEM;
347
348 if (!try_module_get(ici->ops->owner)) {
349 dev_err(&icd->dev, "Couldn't lock capture bus driver.\n");
350 ret = -EINVAL;
351 goto emgi;
352 }
353
354 /*
355 * Protect against icd->ops->remove() until we module_get() both
356 * drivers.
357 */
358 mutex_lock(&icd->video_lock);
359
360 icf->icd = icd;
361 icd->use_count++;
362
363 /* Now we really have to activate the camera */
364 if (icd->use_count == 1) {
365 /* Restore parameters before the last close() per V4L2 API */
366 struct v4l2_format f = {
367 .type = V4L2_BUF_TYPE_VIDEO_CAPTURE,
368 .fmt.pix = {
369 .width = icd->user_width,
370 .height = icd->user_height,
371 .field = icd->field,
372 .pixelformat = icd->current_fmt->fourcc,
373 .colorspace = icd->current_fmt->colorspace,
374 },
375 };
376
377 if (icl->power) {
378 ret = icl->power(icd->pdev, 1);
379 if (ret < 0)
380 goto epower;
381 }
382
383 /* The camera could have been already on, try to reset */
384 if (icl->reset)
385 icl->reset(icd->pdev);
386
387 ret = ici->ops->add(icd);
388 if (ret < 0) {
389 dev_err(&icd->dev, "Couldn't activate the camera: %d\n", ret);
390 goto eiciadd;
391 }
392
393 /* Try to configure with default parameters */
394 ret = soc_camera_set_fmt(icf, &f);
395 if (ret < 0)
396 goto esfmt;
397 }
398
399 file->private_data = icf;
400 dev_dbg(&icd->dev, "camera device open\n");
401
402 ici->ops->init_videobuf(&icf->vb_vidq, icd);
403
404 mutex_unlock(&icd->video_lock);
405
406 return 0;
407
408 /*
409 * First five errors are entered with the .video_lock held
410 * and use_count == 1
411 */
412 esfmt:
413 ici->ops->remove(icd);
414 eiciadd:
415 if (icl->power)
416 icl->power(icd->pdev, 0);
417 epower:
418 icd->use_count--;
419 mutex_unlock(&icd->video_lock);
420 module_put(ici->ops->owner);
421 emgi:
422 vfree(icf);
423 return ret;
424 }
425
426 static int soc_camera_close(struct file *file)
427 {
428 struct soc_camera_file *icf = file->private_data;
429 struct soc_camera_device *icd = icf->icd;
430 struct soc_camera_host *ici = to_soc_camera_host(icd->dev.parent);
431
432 mutex_lock(&icd->video_lock);
433 icd->use_count--;
434 if (!icd->use_count) {
435 struct soc_camera_link *icl = to_soc_camera_link(icd);
436
437 ici->ops->remove(icd);
438 if (icl->power)
439 icl->power(icd->pdev, 0);
440 }
441
442 mutex_unlock(&icd->video_lock);
443
444 module_put(ici->ops->owner);
445
446 vfree(icf);
447
448 dev_dbg(&icd->dev, "camera device close\n");
449
450 return 0;
451 }
452
453 static ssize_t soc_camera_read(struct file *file, char __user *buf,
454 size_t count, loff_t *ppos)
455 {
456 struct soc_camera_file *icf = file->private_data;
457 struct soc_camera_device *icd = icf->icd;
458 int err = -EINVAL;
459
460 dev_err(&icd->dev, "camera device read not implemented\n");
461
462 return err;
463 }
464
465 static int soc_camera_mmap(struct file *file, struct vm_area_struct *vma)
466 {
467 struct soc_camera_file *icf = file->private_data;
468 struct soc_camera_device *icd = icf->icd;
469 int err;
470
471 dev_dbg(&icd->dev, "mmap called, vma=0x%08lx\n", (unsigned long)vma);
472
473 err = videobuf_mmap_mapper(&icf->vb_vidq, vma);
474
475 dev_dbg(&icd->dev, "vma start=0x%08lx, size=%ld, ret=%d\n",
476 (unsigned long)vma->vm_start,
477 (unsigned long)vma->vm_end - (unsigned long)vma->vm_start,
478 err);
479
480 return err;
481 }
482
483 static unsigned int soc_camera_poll(struct file *file, poll_table *pt)
484 {
485 struct soc_camera_file *icf = file->private_data;
486 struct soc_camera_device *icd = icf->icd;
487 struct soc_camera_host *ici = to_soc_camera_host(icd->dev.parent);
488
489 if (list_empty(&icf->vb_vidq.stream)) {
490 dev_err(&icd->dev, "Trying to poll with no queued buffers!\n");
491 return POLLERR;
492 }
493
494 return ici->ops->poll(file, pt);
495 }
496
497 static struct v4l2_file_operations soc_camera_fops = {
498 .owner = THIS_MODULE,
499 .open = soc_camera_open,
500 .release = soc_camera_close,
501 .ioctl = video_ioctl2,
502 .read = soc_camera_read,
503 .mmap = soc_camera_mmap,
504 .poll = soc_camera_poll,
505 };
506
507 static int soc_camera_s_fmt_vid_cap(struct file *file, void *priv,
508 struct v4l2_format *f)
509 {
510 struct soc_camera_file *icf = file->private_data;
511 struct soc_camera_device *icd = icf->icd;
512 int ret;
513
514 WARN_ON(priv != file->private_data);
515
516 mutex_lock(&icf->vb_vidq.vb_lock);
517
518 if (icf->vb_vidq.bufs[0]) {
519 dev_err(&icd->dev, "S_FMT denied: queue initialised\n");
520 ret = -EBUSY;
521 goto unlock;
522 }
523
524 ret = soc_camera_set_fmt(icf, f);
525
526 unlock:
527 mutex_unlock(&icf->vb_vidq.vb_lock);
528
529 return ret;
530 }
531
532 static int soc_camera_enum_fmt_vid_cap(struct file *file, void *priv,
533 struct v4l2_fmtdesc *f)
534 {
535 struct soc_camera_file *icf = file->private_data;
536 struct soc_camera_device *icd = icf->icd;
537 const struct soc_camera_data_format *format;
538
539 WARN_ON(priv != file->private_data);
540
541 if (f->index >= icd->num_user_formats)
542 return -EINVAL;
543
544 format = icd->user_formats[f->index].host_fmt;
545
546 strlcpy(f->description, format->name, sizeof(f->description));
547 f->pixelformat = format->fourcc;
548 return 0;
549 }
550
551 static int soc_camera_g_fmt_vid_cap(struct file *file, void *priv,
552 struct v4l2_format *f)
553 {
554 struct soc_camera_file *icf = file->private_data;
555 struct soc_camera_device *icd = icf->icd;
556 struct v4l2_pix_format *pix = &f->fmt.pix;
557
558 WARN_ON(priv != file->private_data);
559
560 pix->width = icd->user_width;
561 pix->height = icd->user_height;
562 pix->field = icf->vb_vidq.field;
563 pix->pixelformat = icd->current_fmt->fourcc;
564 pix->bytesperline = pix->width *
565 DIV_ROUND_UP(icd->current_fmt->depth, 8);
566 pix->sizeimage = pix->height * pix->bytesperline;
567 dev_dbg(&icd->dev, "current_fmt->fourcc: 0x%08x\n",
568 icd->current_fmt->fourcc);
569 return 0;
570 }
571
572 static int soc_camera_querycap(struct file *file, void *priv,
573 struct v4l2_capability *cap)
574 {
575 struct soc_camera_file *icf = file->private_data;
576 struct soc_camera_device *icd = icf->icd;
577 struct soc_camera_host *ici = to_soc_camera_host(icd->dev.parent);
578
579 WARN_ON(priv != file->private_data);
580
581 strlcpy(cap->driver, ici->drv_name, sizeof(cap->driver));
582 return ici->ops->querycap(ici, cap);
583 }
584
585 static int soc_camera_streamon(struct file *file, void *priv,
586 enum v4l2_buf_type i)
587 {
588 struct soc_camera_file *icf = file->private_data;
589 struct soc_camera_device *icd = icf->icd;
590 struct v4l2_subdev *sd = soc_camera_to_subdev(icd);
591 int ret;
592
593 WARN_ON(priv != file->private_data);
594
595 if (i != V4L2_BUF_TYPE_VIDEO_CAPTURE)
596 return -EINVAL;
597
598 mutex_lock(&icd->video_lock);
599
600 v4l2_subdev_call(sd, video, s_stream, 1);
601
602 /* This calls buf_queue from host driver's videobuf_queue_ops */
603 ret = videobuf_streamon(&icf->vb_vidq);
604
605 mutex_unlock(&icd->video_lock);
606
607 return ret;
608 }
609
610 static int soc_camera_streamoff(struct file *file, void *priv,
611 enum v4l2_buf_type i)
612 {
613 struct soc_camera_file *icf = file->private_data;
614 struct soc_camera_device *icd = icf->icd;
615 struct v4l2_subdev *sd = soc_camera_to_subdev(icd);
616
617 WARN_ON(priv != file->private_data);
618
619 if (i != V4L2_BUF_TYPE_VIDEO_CAPTURE)
620 return -EINVAL;
621
622 mutex_lock(&icd->video_lock);
623
624 /* This calls buf_release from host driver's videobuf_queue_ops for all
625 * remaining buffers. When the last buffer is freed, stop capture */
626 videobuf_streamoff(&icf->vb_vidq);
627
628 v4l2_subdev_call(sd, video, s_stream, 0);
629
630 mutex_unlock(&icd->video_lock);
631
632 return 0;
633 }
634
635 static int soc_camera_queryctrl(struct file *file, void *priv,
636 struct v4l2_queryctrl *qc)
637 {
638 struct soc_camera_file *icf = file->private_data;
639 struct soc_camera_device *icd = icf->icd;
640 struct soc_camera_host *ici = to_soc_camera_host(icd->dev.parent);
641 int i;
642
643 WARN_ON(priv != file->private_data);
644
645 if (!qc->id)
646 return -EINVAL;
647
648 /* First check host controls */
649 for (i = 0; i < ici->ops->num_controls; i++)
650 if (qc->id == ici->ops->controls[i].id) {
651 memcpy(qc, &(ici->ops->controls[i]),
652 sizeof(*qc));
653 return 0;
654 }
655
656 /* Then device controls */
657 for (i = 0; i < icd->ops->num_controls; i++)
658 if (qc->id == icd->ops->controls[i].id) {
659 memcpy(qc, &(icd->ops->controls[i]),
660 sizeof(*qc));
661 return 0;
662 }
663
664 return -EINVAL;
665 }
666
667 static int soc_camera_g_ctrl(struct file *file, void *priv,
668 struct v4l2_control *ctrl)
669 {
670 struct soc_camera_file *icf = file->private_data;
671 struct soc_camera_device *icd = icf->icd;
672 struct soc_camera_host *ici = to_soc_camera_host(icd->dev.parent);
673 struct v4l2_subdev *sd = soc_camera_to_subdev(icd);
674 int ret;
675
676 WARN_ON(priv != file->private_data);
677
678 if (ici->ops->get_ctrl) {
679 ret = ici->ops->get_ctrl(icd, ctrl);
680 if (ret != -ENOIOCTLCMD)
681 return ret;
682 }
683
684 return v4l2_subdev_call(sd, core, g_ctrl, ctrl);
685 }
686
687 static int soc_camera_s_ctrl(struct file *file, void *priv,
688 struct v4l2_control *ctrl)
689 {
690 struct soc_camera_file *icf = file->private_data;
691 struct soc_camera_device *icd = icf->icd;
692 struct soc_camera_host *ici = to_soc_camera_host(icd->dev.parent);
693 struct v4l2_subdev *sd = soc_camera_to_subdev(icd);
694 int ret;
695
696 WARN_ON(priv != file->private_data);
697
698 if (ici->ops->set_ctrl) {
699 ret = ici->ops->set_ctrl(icd, ctrl);
700 if (ret != -ENOIOCTLCMD)
701 return ret;
702 }
703
704 return v4l2_subdev_call(sd, core, s_ctrl, ctrl);
705 }
706
707 static int soc_camera_cropcap(struct file *file, void *fh,
708 struct v4l2_cropcap *a)
709 {
710 struct soc_camera_file *icf = file->private_data;
711 struct soc_camera_device *icd = icf->icd;
712 struct soc_camera_host *ici = to_soc_camera_host(icd->dev.parent);
713
714 return ici->ops->cropcap(icd, a);
715 }
716
717 static int soc_camera_g_crop(struct file *file, void *fh,
718 struct v4l2_crop *a)
719 {
720 struct soc_camera_file *icf = file->private_data;
721 struct soc_camera_device *icd = icf->icd;
722 struct soc_camera_host *ici = to_soc_camera_host(icd->dev.parent);
723 int ret;
724
725 mutex_lock(&icf->vb_vidq.vb_lock);
726 ret = ici->ops->get_crop(icd, a);
727 mutex_unlock(&icf->vb_vidq.vb_lock);
728
729 return ret;
730 }
731
732 /*
733 * According to the V4L2 API, drivers shall not update the struct v4l2_crop
734 * argument with the actual geometry, instead, the user shall use G_CROP to
735 * retrieve it. However, we expect camera host and client drivers to update
736 * the argument, which we then use internally, but do not return to the user.
737 */
738 static int soc_camera_s_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 struct soc_camera_host *ici = to_soc_camera_host(icd->dev.parent);
744 struct v4l2_rect *rect = &a->c;
745 struct v4l2_crop current_crop;
746 int ret;
747
748 if (a->type != V4L2_BUF_TYPE_VIDEO_CAPTURE)
749 return -EINVAL;
750
751 dev_dbg(&icd->dev, "S_CROP(%ux%u@%u:%u)\n",
752 rect->width, rect->height, rect->left, rect->top);
753
754 /* Cropping is allowed during a running capture, guard consistency */
755 mutex_lock(&icf->vb_vidq.vb_lock);
756
757 /* If get_crop fails, we'll let host and / or client drivers decide */
758 ret = ici->ops->get_crop(icd, &current_crop);
759
760 /* Prohibit window size change with initialised buffers */
761 if (icf->vb_vidq.bufs[0] && !ret &&
762 (a->c.width != current_crop.c.width ||
763 a->c.height != current_crop.c.height)) {
764 dev_err(&icd->dev,
765 "S_CROP denied: queue initialised and sizes differ\n");
766 ret = -EBUSY;
767 } else {
768 ret = ici->ops->set_crop(icd, a);
769 }
770
771 mutex_unlock(&icf->vb_vidq.vb_lock);
772
773 return ret;
774 }
775
776 static int soc_camera_g_chip_ident(struct file *file, void *fh,
777 struct v4l2_dbg_chip_ident *id)
778 {
779 struct soc_camera_file *icf = file->private_data;
780 struct soc_camera_device *icd = icf->icd;
781 struct v4l2_subdev *sd = soc_camera_to_subdev(icd);
782
783 return v4l2_subdev_call(sd, core, g_chip_ident, id);
784 }
785
786 #ifdef CONFIG_VIDEO_ADV_DEBUG
787 static int soc_camera_g_register(struct file *file, void *fh,
788 struct v4l2_dbg_register *reg)
789 {
790 struct soc_camera_file *icf = file->private_data;
791 struct soc_camera_device *icd = icf->icd;
792 struct v4l2_subdev *sd = soc_camera_to_subdev(icd);
793
794 return v4l2_subdev_call(sd, core, g_register, reg);
795 }
796
797 static int soc_camera_s_register(struct file *file, void *fh,
798 struct v4l2_dbg_register *reg)
799 {
800 struct soc_camera_file *icf = file->private_data;
801 struct soc_camera_device *icd = icf->icd;
802 struct v4l2_subdev *sd = soc_camera_to_subdev(icd);
803
804 return v4l2_subdev_call(sd, core, s_register, reg);
805 }
806 #endif
807
808 /* So far this function cannot fail */
809 static void scan_add_host(struct soc_camera_host *ici)
810 {
811 struct soc_camera_device *icd;
812
813 mutex_lock(&list_lock);
814
815 list_for_each_entry(icd, &devices, list) {
816 if (icd->iface == ici->nr) {
817 int ret;
818 icd->dev.parent = ici->v4l2_dev.dev;
819 dev_set_name(&icd->dev, "%u-%u", icd->iface,
820 icd->devnum);
821 ret = device_register(&icd->dev);
822 if (ret < 0) {
823 icd->dev.parent = NULL;
824 dev_err(&icd->dev,
825 "Cannot register device: %d\n", ret);
826 }
827 }
828 }
829
830 mutex_unlock(&list_lock);
831 }
832
833 #ifdef CONFIG_I2C_BOARDINFO
834 static int soc_camera_init_i2c(struct soc_camera_device *icd,
835 struct soc_camera_link *icl)
836 {
837 struct i2c_client *client;
838 struct soc_camera_host *ici = to_soc_camera_host(icd->dev.parent);
839 struct i2c_adapter *adap = i2c_get_adapter(icl->i2c_adapter_id);
840 struct v4l2_subdev *subdev;
841 int ret;
842
843 if (!adap) {
844 ret = -ENODEV;
845 dev_err(&icd->dev, "Cannot get I2C adapter #%d. No driver?\n",
846 icl->i2c_adapter_id);
847 goto ei2cga;
848 }
849
850 icl->board_info->platform_data = icd;
851
852 subdev = v4l2_i2c_new_subdev_board(&ici->v4l2_dev, adap,
853 icl->module_name, icl->board_info, NULL);
854 if (!subdev) {
855 ret = -ENOMEM;
856 goto ei2cnd;
857 }
858
859 client = subdev->priv;
860
861 /* Use to_i2c_client(dev) to recover the i2c client */
862 dev_set_drvdata(&icd->dev, &client->dev);
863
864 return 0;
865 ei2cnd:
866 i2c_put_adapter(adap);
867 ei2cga:
868 return ret;
869 }
870
871 static void soc_camera_free_i2c(struct soc_camera_device *icd)
872 {
873 struct i2c_client *client =
874 to_i2c_client(to_soc_camera_control(icd));
875 dev_set_drvdata(&icd->dev, NULL);
876 v4l2_device_unregister_subdev(i2c_get_clientdata(client));
877 i2c_unregister_device(client);
878 i2c_put_adapter(client->adapter);
879 }
880 #else
881 #define soc_camera_init_i2c(icd, icl) (-ENODEV)
882 #define soc_camera_free_i2c(icd) do {} while (0)
883 #endif
884
885 static int soc_camera_video_start(struct soc_camera_device *icd);
886 static int video_dev_create(struct soc_camera_device *icd);
887 /* Called during host-driver probe */
888 static int soc_camera_probe(struct device *dev)
889 {
890 struct soc_camera_device *icd = to_soc_camera_dev(dev);
891 struct soc_camera_host *ici = to_soc_camera_host(dev->parent);
892 struct soc_camera_link *icl = to_soc_camera_link(icd);
893 struct device *control = NULL;
894 struct v4l2_subdev *sd;
895 struct v4l2_format f = {.type = V4L2_BUF_TYPE_VIDEO_CAPTURE};
896 int ret;
897
898 dev_info(dev, "Probing %s\n", dev_name(dev));
899
900 if (icl->power) {
901 ret = icl->power(icd->pdev, 1);
902 if (ret < 0) {
903 dev_err(dev,
904 "Platform failed to power-on the camera.\n");
905 goto epower;
906 }
907 }
908
909 /* The camera could have been already on, try to reset */
910 if (icl->reset)
911 icl->reset(icd->pdev);
912
913 ret = ici->ops->add(icd);
914 if (ret < 0)
915 goto eadd;
916
917 /* Must have icd->vdev before registering the device */
918 ret = video_dev_create(icd);
919 if (ret < 0)
920 goto evdc;
921
922 /* Non-i2c cameras, e.g., soc_camera_platform, have no board_info */
923 if (icl->board_info) {
924 ret = soc_camera_init_i2c(icd, icl);
925 if (ret < 0)
926 goto eadddev;
927 } else if (!icl->add_device || !icl->del_device) {
928 ret = -EINVAL;
929 goto eadddev;
930 } else {
931 if (icl->module_name)
932 ret = request_module(icl->module_name);
933
934 ret = icl->add_device(icl, &icd->dev);
935 if (ret < 0)
936 goto eadddev;
937
938 /*
939 * FIXME: this is racy, have to use driver-binding notification,
940 * when it is available
941 */
942 control = to_soc_camera_control(icd);
943 if (!control || !control->driver || !dev_get_drvdata(control) ||
944 !try_module_get(control->driver->owner)) {
945 icl->del_device(icl);
946 goto enodrv;
947 }
948 }
949
950 /* At this point client .probe() should have run already */
951 ret = soc_camera_init_user_formats(icd);
952 if (ret < 0)
953 goto eiufmt;
954
955 icd->field = V4L2_FIELD_ANY;
956
957 /* ..._video_start() will create a device node, so we have to protect */
958 mutex_lock(&icd->video_lock);
959
960 ret = soc_camera_video_start(icd);
961 if (ret < 0)
962 goto evidstart;
963
964 /* Try to improve our guess of a reasonable window format */
965 sd = soc_camera_to_subdev(icd);
966 if (!v4l2_subdev_call(sd, video, g_fmt, &f)) {
967 icd->user_width = f.fmt.pix.width;
968 icd->user_height = f.fmt.pix.height;
969 }
970
971 /* Do we have to sysfs_remove_link() before device_unregister()? */
972 if (sysfs_create_link(&icd->dev.kobj, &to_soc_camera_control(icd)->kobj,
973 "control"))
974 dev_warn(&icd->dev, "Failed creating the control symlink\n");
975
976 ici->ops->remove(icd);
977
978 if (icl->power)
979 icl->power(icd->pdev, 0);
980
981 mutex_unlock(&icd->video_lock);
982
983 return 0;
984
985 evidstart:
986 mutex_unlock(&icd->video_lock);
987 soc_camera_free_user_formats(icd);
988 eiufmt:
989 if (icl->board_info) {
990 soc_camera_free_i2c(icd);
991 } else {
992 icl->del_device(icl);
993 module_put(control->driver->owner);
994 }
995 enodrv:
996 eadddev:
997 video_device_release(icd->vdev);
998 evdc:
999 ici->ops->remove(icd);
1000 eadd:
1001 if (icl->power)
1002 icl->power(icd->pdev, 0);
1003 epower:
1004 return ret;
1005 }
1006
1007 /* This is called on device_unregister, which only means we have to disconnect
1008 * from the host, but not remove ourselves from the device list */
1009 static int soc_camera_remove(struct device *dev)
1010 {
1011 struct soc_camera_device *icd = to_soc_camera_dev(dev);
1012 struct soc_camera_link *icl = to_soc_camera_link(icd);
1013 struct video_device *vdev = icd->vdev;
1014
1015 BUG_ON(!dev->parent);
1016
1017 if (vdev) {
1018 mutex_lock(&icd->video_lock);
1019 video_unregister_device(vdev);
1020 icd->vdev = NULL;
1021 mutex_unlock(&icd->video_lock);
1022 }
1023
1024 if (icl->board_info) {
1025 soc_camera_free_i2c(icd);
1026 } else {
1027 struct device_driver *drv = to_soc_camera_control(icd) ?
1028 to_soc_camera_control(icd)->driver : NULL;
1029 if (drv) {
1030 icl->del_device(icl);
1031 module_put(drv->owner);
1032 }
1033 }
1034 soc_camera_free_user_formats(icd);
1035
1036 return 0;
1037 }
1038
1039 static int soc_camera_suspend(struct device *dev, pm_message_t state)
1040 {
1041 struct soc_camera_device *icd = to_soc_camera_dev(dev);
1042 struct soc_camera_host *ici = to_soc_camera_host(icd->dev.parent);
1043 int ret = 0;
1044
1045 if (ici->ops->suspend)
1046 ret = ici->ops->suspend(icd, state);
1047
1048 return ret;
1049 }
1050
1051 static int soc_camera_resume(struct device *dev)
1052 {
1053 struct soc_camera_device *icd = to_soc_camera_dev(dev);
1054 struct soc_camera_host *ici = to_soc_camera_host(icd->dev.parent);
1055 int ret = 0;
1056
1057 if (ici->ops->resume)
1058 ret = ici->ops->resume(icd);
1059
1060 return ret;
1061 }
1062
1063 static struct bus_type soc_camera_bus_type = {
1064 .name = "soc-camera",
1065 .probe = soc_camera_probe,
1066 .remove = soc_camera_remove,
1067 .suspend = soc_camera_suspend,
1068 .resume = soc_camera_resume,
1069 };
1070
1071 static struct device_driver ic_drv = {
1072 .name = "camera",
1073 .bus = &soc_camera_bus_type,
1074 .owner = THIS_MODULE,
1075 };
1076
1077 static void dummy_release(struct device *dev)
1078 {
1079 }
1080
1081 static int default_cropcap(struct soc_camera_device *icd,
1082 struct v4l2_cropcap *a)
1083 {
1084 struct v4l2_subdev *sd = soc_camera_to_subdev(icd);
1085 return v4l2_subdev_call(sd, video, cropcap, a);
1086 }
1087
1088 static int default_g_crop(struct soc_camera_device *icd, struct v4l2_crop *a)
1089 {
1090 struct v4l2_subdev *sd = soc_camera_to_subdev(icd);
1091 return v4l2_subdev_call(sd, video, g_crop, a);
1092 }
1093
1094 static int default_s_crop(struct soc_camera_device *icd, struct v4l2_crop *a)
1095 {
1096 struct v4l2_subdev *sd = soc_camera_to_subdev(icd);
1097 return v4l2_subdev_call(sd, video, s_crop, a);
1098 }
1099
1100 int soc_camera_host_register(struct soc_camera_host *ici)
1101 {
1102 struct soc_camera_host *ix;
1103 int ret;
1104
1105 if (!ici || !ici->ops ||
1106 !ici->ops->try_fmt ||
1107 !ici->ops->set_fmt ||
1108 !ici->ops->set_bus_param ||
1109 !ici->ops->querycap ||
1110 !ici->ops->init_videobuf ||
1111 !ici->ops->reqbufs ||
1112 !ici->ops->add ||
1113 !ici->ops->remove ||
1114 !ici->ops->poll ||
1115 !ici->v4l2_dev.dev)
1116 return -EINVAL;
1117
1118 if (!ici->ops->set_crop)
1119 ici->ops->set_crop = default_s_crop;
1120 if (!ici->ops->get_crop)
1121 ici->ops->get_crop = default_g_crop;
1122 if (!ici->ops->cropcap)
1123 ici->ops->cropcap = default_cropcap;
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 int ret;
1277
1278 if (!icd->dev.parent)
1279 return -ENODEV;
1280
1281 if (!icd->ops ||
1282 !icd->ops->query_bus_param ||
1283 !icd->ops->set_bus_param)
1284 return -EINVAL;
1285
1286 ret = video_register_device(icd->vdev, VFL_TYPE_GRABBER,
1287 icd->vdev->minor);
1288 if (ret < 0) {
1289 dev_err(&icd->dev, "video_register_device failed: %d\n", ret);
1290 return ret;
1291 }
1292
1293 return 0;
1294 }
1295
1296 static int __devinit soc_camera_pdrv_probe(struct platform_device *pdev)
1297 {
1298 struct soc_camera_link *icl = pdev->dev.platform_data;
1299 struct soc_camera_device *icd;
1300 int ret;
1301
1302 if (!icl)
1303 return -EINVAL;
1304
1305 icd = kzalloc(sizeof(*icd), GFP_KERNEL);
1306 if (!icd)
1307 return -ENOMEM;
1308
1309 icd->iface = icl->bus_id;
1310 icd->pdev = &pdev->dev;
1311 platform_set_drvdata(pdev, icd);
1312 icd->dev.platform_data = icl;
1313
1314 ret = soc_camera_device_register(icd);
1315 if (ret < 0)
1316 goto escdevreg;
1317
1318 icd->user_width = DEFAULT_WIDTH;
1319 icd->user_height = DEFAULT_HEIGHT;
1320
1321 return 0;
1322
1323 escdevreg:
1324 kfree(icd);
1325
1326 return ret;
1327 }
1328
1329 /* Only called on rmmod for each platform device, since they are not
1330 * hot-pluggable. Now we know, that all our users - hosts and devices have
1331 * been unloaded already */
1332 static int __devexit soc_camera_pdrv_remove(struct platform_device *pdev)
1333 {
1334 struct soc_camera_device *icd = platform_get_drvdata(pdev);
1335
1336 if (!icd)
1337 return -EINVAL;
1338
1339 soc_camera_device_unregister(icd);
1340
1341 kfree(icd);
1342
1343 return 0;
1344 }
1345
1346 static struct platform_driver __refdata soc_camera_pdrv = {
1347 .remove = __devexit_p(soc_camera_pdrv_remove),
1348 .driver = {
1349 .name = "soc-camera-pdrv",
1350 .owner = THIS_MODULE,
1351 },
1352 };
1353
1354 static int __init soc_camera_init(void)
1355 {
1356 int ret = bus_register(&soc_camera_bus_type);
1357 if (ret)
1358 return ret;
1359 ret = driver_register(&ic_drv);
1360 if (ret)
1361 goto edrvr;
1362
1363 ret = platform_driver_probe(&soc_camera_pdrv, soc_camera_pdrv_probe);
1364 if (ret)
1365 goto epdr;
1366
1367 return 0;
1368
1369 epdr:
1370 driver_unregister(&ic_drv);
1371 edrvr:
1372 bus_unregister(&soc_camera_bus_type);
1373 return ret;
1374 }
1375
1376 static void __exit soc_camera_exit(void)
1377 {
1378 platform_driver_unregister(&soc_camera_pdrv);
1379 driver_unregister(&ic_drv);
1380 bus_unregister(&soc_camera_bus_type);
1381 }
1382
1383 module_init(soc_camera_init);
1384 module_exit(soc_camera_exit);
1385
1386 MODULE_DESCRIPTION("Image capture bus driver");
1387 MODULE_AUTHOR("Guennadi Liakhovetski <kernel@pengutronix.de>");
1388 MODULE_LICENSE("GPL");
1389 MODULE_ALIAS("platform:soc-camera-pdrv");
Linux for Ginger Game Console