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Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jbarnes...
[GitHub/mt8127/android_kernel_alcatel_ttab.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/regulator/consumer.h>
28 #include <linux/slab.h>
29 #include <linux/pm_runtime.h>
30 #include <linux/vmalloc.h>
31
32 #include <media/soc_camera.h>
33 #include <media/v4l2-common.h>
34 #include <media/v4l2-ioctl.h>
35 #include <media/v4l2-dev.h>
36 #include <media/videobuf-core.h>
37 #include <media/videobuf2-core.h>
38 #include <media/soc_mediabus.h>
39
40 /* Default to VGA resolution */
41 #define DEFAULT_WIDTH 640
42 #define DEFAULT_HEIGHT 480
43
44 #define is_streaming(ici, icd) \
45 (((ici)->ops->init_videobuf) ? \
46 (icd)->vb_vidq.streaming : \
47 vb2_is_streaming(&(icd)->vb2_vidq))
48
49 static LIST_HEAD(hosts);
50 static LIST_HEAD(devices);
51 static DEFINE_MUTEX(list_lock); /* Protects the list of hosts */
52
53 static int soc_camera_power_set(struct soc_camera_device *icd,
54 struct soc_camera_link *icl,
55 int power_on)
56 {
57 int ret;
58
59 if (power_on) {
60 ret = regulator_bulk_enable(icl->num_regulators,
61 icl->regulators);
62 if (ret < 0) {
63 dev_err(&icd->dev, "Cannot enable regulators\n");
64 return ret;
65 }
66
67 if (icl->power)
68 ret = icl->power(icd->pdev, power_on);
69 if (ret < 0) {
70 dev_err(&icd->dev,
71 "Platform failed to power-on the camera.\n");
72
73 regulator_bulk_disable(icl->num_regulators,
74 icl->regulators);
75 return ret;
76 }
77 } else {
78 ret = 0;
79 if (icl->power)
80 ret = icl->power(icd->pdev, 0);
81 if (ret < 0) {
82 dev_err(&icd->dev,
83 "Platform failed to power-off the camera.\n");
84 return ret;
85 }
86
87 ret = regulator_bulk_disable(icl->num_regulators,
88 icl->regulators);
89 if (ret < 0) {
90 dev_err(&icd->dev, "Cannot disable regulators\n");
91 return ret;
92 }
93 }
94
95 return 0;
96 }
97
98 const struct soc_camera_format_xlate *soc_camera_xlate_by_fourcc(
99 struct soc_camera_device *icd, unsigned int fourcc)
100 {
101 unsigned int i;
102
103 for (i = 0; i < icd->num_user_formats; i++)
104 if (icd->user_formats[i].host_fmt->fourcc == fourcc)
105 return icd->user_formats + i;
106 return NULL;
107 }
108 EXPORT_SYMBOL(soc_camera_xlate_by_fourcc);
109
110 /**
111 * soc_camera_apply_sensor_flags() - apply platform SOCAM_SENSOR_INVERT_* flags
112 * @icl: camera platform parameters
113 * @flags: flags to be inverted according to platform configuration
114 * @return: resulting flags
115 */
116 unsigned long soc_camera_apply_sensor_flags(struct soc_camera_link *icl,
117 unsigned long flags)
118 {
119 unsigned long f;
120
121 /* If only one of the two polarities is supported, switch to the opposite */
122 if (icl->flags & SOCAM_SENSOR_INVERT_HSYNC) {
123 f = flags & (SOCAM_HSYNC_ACTIVE_HIGH | SOCAM_HSYNC_ACTIVE_LOW);
124 if (f == SOCAM_HSYNC_ACTIVE_HIGH || f == SOCAM_HSYNC_ACTIVE_LOW)
125 flags ^= SOCAM_HSYNC_ACTIVE_HIGH | SOCAM_HSYNC_ACTIVE_LOW;
126 }
127
128 if (icl->flags & SOCAM_SENSOR_INVERT_VSYNC) {
129 f = flags & (SOCAM_VSYNC_ACTIVE_HIGH | SOCAM_VSYNC_ACTIVE_LOW);
130 if (f == SOCAM_VSYNC_ACTIVE_HIGH || f == SOCAM_VSYNC_ACTIVE_LOW)
131 flags ^= SOCAM_VSYNC_ACTIVE_HIGH | SOCAM_VSYNC_ACTIVE_LOW;
132 }
133
134 if (icl->flags & SOCAM_SENSOR_INVERT_PCLK) {
135 f = flags & (SOCAM_PCLK_SAMPLE_RISING | SOCAM_PCLK_SAMPLE_FALLING);
136 if (f == SOCAM_PCLK_SAMPLE_RISING || f == SOCAM_PCLK_SAMPLE_FALLING)
137 flags ^= SOCAM_PCLK_SAMPLE_RISING | SOCAM_PCLK_SAMPLE_FALLING;
138 }
139
140 return flags;
141 }
142 EXPORT_SYMBOL(soc_camera_apply_sensor_flags);
143
144 #define pixfmtstr(x) (x) & 0xff, ((x) >> 8) & 0xff, ((x) >> 16) & 0xff, \
145 ((x) >> 24) & 0xff
146
147 static int soc_camera_try_fmt(struct soc_camera_device *icd,
148 struct v4l2_format *f)
149 {
150 struct soc_camera_host *ici = to_soc_camera_host(icd->dev.parent);
151 struct v4l2_pix_format *pix = &f->fmt.pix;
152 int ret;
153
154 dev_dbg(&icd->dev, "TRY_FMT(%c%c%c%c, %ux%u)\n",
155 pixfmtstr(pix->pixelformat), pix->width, pix->height);
156
157 pix->bytesperline = 0;
158 pix->sizeimage = 0;
159
160 ret = ici->ops->try_fmt(icd, f);
161 if (ret < 0)
162 return ret;
163
164 if (!pix->sizeimage) {
165 if (!pix->bytesperline) {
166 const struct soc_camera_format_xlate *xlate;
167
168 xlate = soc_camera_xlate_by_fourcc(icd, pix->pixelformat);
169 if (!xlate)
170 return -EINVAL;
171
172 ret = soc_mbus_bytes_per_line(pix->width,
173 xlate->host_fmt);
174 if (ret > 0)
175 pix->bytesperline = ret;
176 }
177 if (pix->bytesperline)
178 pix->sizeimage = pix->bytesperline * pix->height;
179 }
180
181 return 0;
182 }
183
184 static int soc_camera_try_fmt_vid_cap(struct file *file, void *priv,
185 struct v4l2_format *f)
186 {
187 struct soc_camera_device *icd = file->private_data;
188
189 WARN_ON(priv != file->private_data);
190
191 /* Only single-plane capture is supported so far */
192 if (f->type != V4L2_BUF_TYPE_VIDEO_CAPTURE)
193 return -EINVAL;
194
195 /* limit format to hardware capabilities */
196 return soc_camera_try_fmt(icd, f);
197 }
198
199 static int soc_camera_enum_input(struct file *file, void *priv,
200 struct v4l2_input *inp)
201 {
202 struct soc_camera_device *icd = file->private_data;
203 int ret = 0;
204
205 if (inp->index != 0)
206 return -EINVAL;
207
208 if (icd->ops->enum_input)
209 ret = icd->ops->enum_input(icd, inp);
210 else {
211 /* default is camera */
212 inp->type = V4L2_INPUT_TYPE_CAMERA;
213 inp->std = V4L2_STD_UNKNOWN;
214 strcpy(inp->name, "Camera");
215 }
216
217 return ret;
218 }
219
220 static int soc_camera_g_input(struct file *file, void *priv, unsigned int *i)
221 {
222 *i = 0;
223
224 return 0;
225 }
226
227 static int soc_camera_s_input(struct file *file, void *priv, unsigned int i)
228 {
229 if (i > 0)
230 return -EINVAL;
231
232 return 0;
233 }
234
235 static int soc_camera_s_std(struct file *file, void *priv, v4l2_std_id *a)
236 {
237 struct soc_camera_device *icd = file->private_data;
238 struct v4l2_subdev *sd = soc_camera_to_subdev(icd);
239
240 return v4l2_subdev_call(sd, core, s_std, *a);
241 }
242
243 static int soc_camera_enum_fsizes(struct file *file, void *fh,
244 struct v4l2_frmsizeenum *fsize)
245 {
246 struct soc_camera_device *icd = file->private_data;
247 struct soc_camera_host *ici = to_soc_camera_host(icd->dev.parent);
248
249 return ici->ops->enum_fsizes(icd, fsize);
250 }
251
252 static int soc_camera_reqbufs(struct file *file, void *priv,
253 struct v4l2_requestbuffers *p)
254 {
255 int ret;
256 struct soc_camera_device *icd = file->private_data;
257 struct soc_camera_host *ici = to_soc_camera_host(icd->dev.parent);
258
259 WARN_ON(priv != file->private_data);
260
261 if (icd->streamer && icd->streamer != file)
262 return -EBUSY;
263
264 if (ici->ops->init_videobuf) {
265 ret = videobuf_reqbufs(&icd->vb_vidq, p);
266 if (ret < 0)
267 return ret;
268
269 ret = ici->ops->reqbufs(icd, p);
270 } else {
271 ret = vb2_reqbufs(&icd->vb2_vidq, p);
272 }
273
274 if (!ret && !icd->streamer)
275 icd->streamer = file;
276
277 return ret;
278 }
279
280 static int soc_camera_querybuf(struct file *file, void *priv,
281 struct v4l2_buffer *p)
282 {
283 struct soc_camera_device *icd = file->private_data;
284 struct soc_camera_host *ici = to_soc_camera_host(icd->dev.parent);
285
286 WARN_ON(priv != file->private_data);
287
288 if (ici->ops->init_videobuf)
289 return videobuf_querybuf(&icd->vb_vidq, p);
290 else
291 return vb2_querybuf(&icd->vb2_vidq, p);
292 }
293
294 static int soc_camera_qbuf(struct file *file, void *priv,
295 struct v4l2_buffer *p)
296 {
297 struct soc_camera_device *icd = file->private_data;
298 struct soc_camera_host *ici = to_soc_camera_host(icd->dev.parent);
299
300 WARN_ON(priv != file->private_data);
301
302 if (icd->streamer != file)
303 return -EBUSY;
304
305 if (ici->ops->init_videobuf)
306 return videobuf_qbuf(&icd->vb_vidq, p);
307 else
308 return vb2_qbuf(&icd->vb2_vidq, p);
309 }
310
311 static int soc_camera_dqbuf(struct file *file, void *priv,
312 struct v4l2_buffer *p)
313 {
314 struct soc_camera_device *icd = file->private_data;
315 struct soc_camera_host *ici = to_soc_camera_host(icd->dev.parent);
316
317 WARN_ON(priv != file->private_data);
318
319 if (icd->streamer != file)
320 return -EBUSY;
321
322 if (ici->ops->init_videobuf)
323 return videobuf_dqbuf(&icd->vb_vidq, p, file->f_flags & O_NONBLOCK);
324 else
325 return vb2_dqbuf(&icd->vb2_vidq, p, file->f_flags & O_NONBLOCK);
326 }
327
328 /* Always entered with .video_lock held */
329 static int soc_camera_init_user_formats(struct soc_camera_device *icd)
330 {
331 struct v4l2_subdev *sd = soc_camera_to_subdev(icd);
332 struct soc_camera_host *ici = to_soc_camera_host(icd->dev.parent);
333 unsigned int i, fmts = 0, raw_fmts = 0;
334 int ret;
335 enum v4l2_mbus_pixelcode code;
336
337 while (!v4l2_subdev_call(sd, video, enum_mbus_fmt, raw_fmts, &code))
338 raw_fmts++;
339
340 if (!ici->ops->get_formats)
341 /*
342 * Fallback mode - the host will have to serve all
343 * sensor-provided formats one-to-one to the user
344 */
345 fmts = raw_fmts;
346 else
347 /*
348 * First pass - only count formats this host-sensor
349 * configuration can provide
350 */
351 for (i = 0; i < raw_fmts; i++) {
352 ret = ici->ops->get_formats(icd, i, NULL);
353 if (ret < 0)
354 return ret;
355 fmts += ret;
356 }
357
358 if (!fmts)
359 return -ENXIO;
360
361 icd->user_formats =
362 vmalloc(fmts * sizeof(struct soc_camera_format_xlate));
363 if (!icd->user_formats)
364 return -ENOMEM;
365
366 dev_dbg(&icd->dev, "Found %d supported formats.\n", fmts);
367
368 /* Second pass - actually fill data formats */
369 fmts = 0;
370 for (i = 0; i < raw_fmts; i++)
371 if (!ici->ops->get_formats) {
372 v4l2_subdev_call(sd, video, enum_mbus_fmt, i, &code);
373 icd->user_formats[fmts].host_fmt =
374 soc_mbus_get_fmtdesc(code);
375 if (icd->user_formats[fmts].host_fmt)
376 icd->user_formats[fmts++].code = code;
377 } else {
378 ret = ici->ops->get_formats(icd, i,
379 &icd->user_formats[fmts]);
380 if (ret < 0)
381 goto egfmt;
382 fmts += ret;
383 }
384
385 icd->num_user_formats = fmts;
386 icd->current_fmt = &icd->user_formats[0];
387
388 return 0;
389
390 egfmt:
391 vfree(icd->user_formats);
392 return ret;
393 }
394
395 /* Always entered with .video_lock held */
396 static void soc_camera_free_user_formats(struct soc_camera_device *icd)
397 {
398 struct soc_camera_host *ici = to_soc_camera_host(icd->dev.parent);
399
400 if (ici->ops->put_formats)
401 ici->ops->put_formats(icd);
402 icd->current_fmt = NULL;
403 icd->num_user_formats = 0;
404 vfree(icd->user_formats);
405 icd->user_formats = NULL;
406 }
407
408 /* Called with .vb_lock held, or from the first open(2), see comment there */
409 static int soc_camera_set_fmt(struct soc_camera_device *icd,
410 struct v4l2_format *f)
411 {
412 struct soc_camera_host *ici = to_soc_camera_host(icd->dev.parent);
413 struct v4l2_pix_format *pix = &f->fmt.pix;
414 int ret;
415
416 dev_dbg(&icd->dev, "S_FMT(%c%c%c%c, %ux%u)\n",
417 pixfmtstr(pix->pixelformat), pix->width, pix->height);
418
419 /* We always call try_fmt() before set_fmt() or set_crop() */
420 ret = soc_camera_try_fmt(icd, f);
421 if (ret < 0)
422 return ret;
423
424 ret = ici->ops->set_fmt(icd, f);
425 if (ret < 0) {
426 return ret;
427 } else if (!icd->current_fmt ||
428 icd->current_fmt->host_fmt->fourcc != pix->pixelformat) {
429 dev_err(&icd->dev,
430 "Host driver hasn't set up current format correctly!\n");
431 return -EINVAL;
432 }
433
434 icd->user_width = pix->width;
435 icd->user_height = pix->height;
436 icd->bytesperline = pix->bytesperline;
437 icd->sizeimage = pix->sizeimage;
438 icd->colorspace = pix->colorspace;
439 icd->field = pix->field;
440 if (ici->ops->init_videobuf)
441 icd->vb_vidq.field = pix->field;
442
443 dev_dbg(&icd->dev, "set width: %d height: %d\n",
444 icd->user_width, icd->user_height);
445
446 /* set physical bus parameters */
447 return ici->ops->set_bus_param(icd, pix->pixelformat);
448 }
449
450 static int soc_camera_open(struct file *file)
451 {
452 struct video_device *vdev = video_devdata(file);
453 struct soc_camera_device *icd = container_of(vdev->parent,
454 struct soc_camera_device,
455 dev);
456 struct soc_camera_link *icl = to_soc_camera_link(icd);
457 struct soc_camera_host *ici;
458 int ret;
459
460 if (!icd->ops)
461 /* No device driver attached */
462 return -ENODEV;
463
464 ici = to_soc_camera_host(icd->dev.parent);
465
466 if (!try_module_get(ici->ops->owner)) {
467 dev_err(&icd->dev, "Couldn't lock capture bus driver.\n");
468 return -EINVAL;
469 }
470
471 icd->use_count++;
472
473 /* Now we really have to activate the camera */
474 if (icd->use_count == 1) {
475 /* Restore parameters before the last close() per V4L2 API */
476 struct v4l2_format f = {
477 .type = V4L2_BUF_TYPE_VIDEO_CAPTURE,
478 .fmt.pix = {
479 .width = icd->user_width,
480 .height = icd->user_height,
481 .field = icd->field,
482 .colorspace = icd->colorspace,
483 .pixelformat =
484 icd->current_fmt->host_fmt->fourcc,
485 },
486 };
487
488 ret = soc_camera_power_set(icd, icl, 1);
489 if (ret < 0)
490 goto epower;
491
492 /* The camera could have been already on, try to reset */
493 if (icl->reset)
494 icl->reset(icd->pdev);
495
496 ret = ici->ops->add(icd);
497 if (ret < 0) {
498 dev_err(&icd->dev, "Couldn't activate the camera: %d\n", ret);
499 goto eiciadd;
500 }
501
502 pm_runtime_enable(&icd->vdev->dev);
503 ret = pm_runtime_resume(&icd->vdev->dev);
504 if (ret < 0 && ret != -ENOSYS)
505 goto eresume;
506
507 /*
508 * Try to configure with default parameters. Notice: this is the
509 * very first open, so, we cannot race against other calls,
510 * apart from someone else calling open() simultaneously, but
511 * .video_lock is protecting us against it.
512 */
513 ret = soc_camera_set_fmt(icd, &f);
514 if (ret < 0)
515 goto esfmt;
516
517 if (ici->ops->init_videobuf) {
518 ici->ops->init_videobuf(&icd->vb_vidq, icd);
519 } else {
520 ret = ici->ops->init_videobuf2(&icd->vb2_vidq, icd);
521 if (ret < 0)
522 goto einitvb;
523 }
524 }
525
526 file->private_data = icd;
527 dev_dbg(&icd->dev, "camera device open\n");
528
529 return 0;
530
531 /*
532 * First four errors are entered with the .video_lock held
533 * and use_count == 1
534 */
535 einitvb:
536 esfmt:
537 pm_runtime_disable(&icd->vdev->dev);
538 eresume:
539 ici->ops->remove(icd);
540 eiciadd:
541 soc_camera_power_set(icd, icl, 0);
542 epower:
543 icd->use_count--;
544 module_put(ici->ops->owner);
545
546 return ret;
547 }
548
549 static int soc_camera_close(struct file *file)
550 {
551 struct soc_camera_device *icd = file->private_data;
552 struct soc_camera_host *ici = to_soc_camera_host(icd->dev.parent);
553
554 icd->use_count--;
555 if (!icd->use_count) {
556 struct soc_camera_link *icl = to_soc_camera_link(icd);
557
558 pm_runtime_suspend(&icd->vdev->dev);
559 pm_runtime_disable(&icd->vdev->dev);
560
561 ici->ops->remove(icd);
562 if (ici->ops->init_videobuf2)
563 vb2_queue_release(&icd->vb2_vidq);
564
565 soc_camera_power_set(icd, icl, 0);
566 }
567
568 if (icd->streamer == file)
569 icd->streamer = NULL;
570
571 module_put(ici->ops->owner);
572
573 dev_dbg(&icd->dev, "camera device close\n");
574
575 return 0;
576 }
577
578 static ssize_t soc_camera_read(struct file *file, char __user *buf,
579 size_t count, loff_t *ppos)
580 {
581 struct soc_camera_device *icd = file->private_data;
582 int err = -EINVAL;
583
584 dev_err(&icd->dev, "camera device read not implemented\n");
585
586 return err;
587 }
588
589 static int soc_camera_mmap(struct file *file, struct vm_area_struct *vma)
590 {
591 struct soc_camera_device *icd = file->private_data;
592 struct soc_camera_host *ici = to_soc_camera_host(icd->dev.parent);
593 int err;
594
595 dev_dbg(&icd->dev, "mmap called, vma=0x%08lx\n", (unsigned long)vma);
596
597 if (icd->streamer != file)
598 return -EBUSY;
599
600 if (ici->ops->init_videobuf)
601 err = videobuf_mmap_mapper(&icd->vb_vidq, vma);
602 else
603 err = vb2_mmap(&icd->vb2_vidq, vma);
604
605 dev_dbg(&icd->dev, "vma start=0x%08lx, size=%ld, ret=%d\n",
606 (unsigned long)vma->vm_start,
607 (unsigned long)vma->vm_end - (unsigned long)vma->vm_start,
608 err);
609
610 return err;
611 }
612
613 static unsigned int soc_camera_poll(struct file *file, poll_table *pt)
614 {
615 struct soc_camera_device *icd = file->private_data;
616 struct soc_camera_host *ici = to_soc_camera_host(icd->dev.parent);
617
618 if (icd->streamer != file)
619 return -EBUSY;
620
621 if (ici->ops->init_videobuf && list_empty(&icd->vb_vidq.stream)) {
622 dev_err(&icd->dev, "Trying to poll with no queued buffers!\n");
623 return POLLERR;
624 }
625
626 return ici->ops->poll(file, pt);
627 }
628
629 void soc_camera_lock(struct vb2_queue *vq)
630 {
631 struct soc_camera_device *icd = vb2_get_drv_priv(vq);
632 mutex_lock(&icd->video_lock);
633 }
634 EXPORT_SYMBOL(soc_camera_lock);
635
636 void soc_camera_unlock(struct vb2_queue *vq)
637 {
638 struct soc_camera_device *icd = vb2_get_drv_priv(vq);
639 mutex_unlock(&icd->video_lock);
640 }
641 EXPORT_SYMBOL(soc_camera_unlock);
642
643 static struct v4l2_file_operations soc_camera_fops = {
644 .owner = THIS_MODULE,
645 .open = soc_camera_open,
646 .release = soc_camera_close,
647 .unlocked_ioctl = video_ioctl2,
648 .read = soc_camera_read,
649 .mmap = soc_camera_mmap,
650 .poll = soc_camera_poll,
651 };
652
653 static int soc_camera_s_fmt_vid_cap(struct file *file, void *priv,
654 struct v4l2_format *f)
655 {
656 struct soc_camera_device *icd = file->private_data;
657 int ret;
658
659 WARN_ON(priv != file->private_data);
660
661 if (f->type != V4L2_BUF_TYPE_VIDEO_CAPTURE) {
662 dev_warn(&icd->dev, "Wrong buf-type %d\n", f->type);
663 return -EINVAL;
664 }
665
666 if (icd->streamer && icd->streamer != file)
667 return -EBUSY;
668
669 if (is_streaming(to_soc_camera_host(icd->dev.parent), icd)) {
670 dev_err(&icd->dev, "S_FMT denied: queue initialised\n");
671 return -EBUSY;
672 }
673
674 ret = soc_camera_set_fmt(icd, f);
675
676 if (!ret && !icd->streamer)
677 icd->streamer = file;
678
679 return ret;
680 }
681
682 static int soc_camera_enum_fmt_vid_cap(struct file *file, void *priv,
683 struct v4l2_fmtdesc *f)
684 {
685 struct soc_camera_device *icd = file->private_data;
686 const struct soc_mbus_pixelfmt *format;
687
688 WARN_ON(priv != file->private_data);
689
690 if (f->index >= icd->num_user_formats)
691 return -EINVAL;
692
693 format = icd->user_formats[f->index].host_fmt;
694
695 if (format->name)
696 strlcpy(f->description, format->name, sizeof(f->description));
697 f->pixelformat = format->fourcc;
698 return 0;
699 }
700
701 static int soc_camera_g_fmt_vid_cap(struct file *file, void *priv,
702 struct v4l2_format *f)
703 {
704 struct soc_camera_device *icd = file->private_data;
705 struct v4l2_pix_format *pix = &f->fmt.pix;
706
707 WARN_ON(priv != file->private_data);
708
709 if (f->type != V4L2_BUF_TYPE_VIDEO_CAPTURE)
710 return -EINVAL;
711
712 pix->width = icd->user_width;
713 pix->height = icd->user_height;
714 pix->bytesperline = icd->bytesperline;
715 pix->sizeimage = icd->sizeimage;
716 pix->field = icd->field;
717 pix->pixelformat = icd->current_fmt->host_fmt->fourcc;
718 pix->colorspace = icd->colorspace;
719 dev_dbg(&icd->dev, "current_fmt->fourcc: 0x%08x\n",
720 icd->current_fmt->host_fmt->fourcc);
721 return 0;
722 }
723
724 static int soc_camera_querycap(struct file *file, void *priv,
725 struct v4l2_capability *cap)
726 {
727 struct soc_camera_device *icd = file->private_data;
728 struct soc_camera_host *ici = to_soc_camera_host(icd->dev.parent);
729
730 WARN_ON(priv != file->private_data);
731
732 strlcpy(cap->driver, ici->drv_name, sizeof(cap->driver));
733 return ici->ops->querycap(ici, cap);
734 }
735
736 static int soc_camera_streamon(struct file *file, void *priv,
737 enum v4l2_buf_type i)
738 {
739 struct soc_camera_device *icd = file->private_data;
740 struct soc_camera_host *ici = to_soc_camera_host(icd->dev.parent);
741 struct v4l2_subdev *sd = soc_camera_to_subdev(icd);
742 int ret;
743
744 WARN_ON(priv != file->private_data);
745
746 if (i != V4L2_BUF_TYPE_VIDEO_CAPTURE)
747 return -EINVAL;
748
749 if (icd->streamer != file)
750 return -EBUSY;
751
752 /* This calls buf_queue from host driver's videobuf_queue_ops */
753 if (ici->ops->init_videobuf)
754 ret = videobuf_streamon(&icd->vb_vidq);
755 else
756 ret = vb2_streamon(&icd->vb2_vidq, i);
757
758 if (!ret)
759 v4l2_subdev_call(sd, video, s_stream, 1);
760
761 return ret;
762 }
763
764 static int soc_camera_streamoff(struct file *file, void *priv,
765 enum v4l2_buf_type i)
766 {
767 struct soc_camera_device *icd = file->private_data;
768 struct v4l2_subdev *sd = soc_camera_to_subdev(icd);
769 struct soc_camera_host *ici = to_soc_camera_host(icd->dev.parent);
770
771 WARN_ON(priv != file->private_data);
772
773 if (i != V4L2_BUF_TYPE_VIDEO_CAPTURE)
774 return -EINVAL;
775
776 if (icd->streamer != file)
777 return -EBUSY;
778
779 /*
780 * This calls buf_release from host driver's videobuf_queue_ops for all
781 * remaining buffers. When the last buffer is freed, stop capture
782 */
783 if (ici->ops->init_videobuf)
784 videobuf_streamoff(&icd->vb_vidq);
785 else
786 vb2_streamoff(&icd->vb2_vidq, i);
787
788 v4l2_subdev_call(sd, video, s_stream, 0);
789
790 return 0;
791 }
792
793 static int soc_camera_queryctrl(struct file *file, void *priv,
794 struct v4l2_queryctrl *qc)
795 {
796 struct soc_camera_device *icd = file->private_data;
797 struct soc_camera_host *ici = to_soc_camera_host(icd->dev.parent);
798 int i;
799
800 WARN_ON(priv != file->private_data);
801
802 if (!qc->id)
803 return -EINVAL;
804
805 /* First check host controls */
806 for (i = 0; i < ici->ops->num_controls; i++)
807 if (qc->id == ici->ops->controls[i].id) {
808 memcpy(qc, &(ici->ops->controls[i]),
809 sizeof(*qc));
810 return 0;
811 }
812
813 /* Then device controls */
814 for (i = 0; i < icd->ops->num_controls; i++)
815 if (qc->id == icd->ops->controls[i].id) {
816 memcpy(qc, &(icd->ops->controls[i]),
817 sizeof(*qc));
818 return 0;
819 }
820
821 return -EINVAL;
822 }
823
824 static int soc_camera_g_ctrl(struct file *file, void *priv,
825 struct v4l2_control *ctrl)
826 {
827 struct soc_camera_device *icd = file->private_data;
828 struct soc_camera_host *ici = to_soc_camera_host(icd->dev.parent);
829 struct v4l2_subdev *sd = soc_camera_to_subdev(icd);
830 int ret;
831
832 WARN_ON(priv != file->private_data);
833
834 if (ici->ops->get_ctrl) {
835 ret = ici->ops->get_ctrl(icd, ctrl);
836 if (ret != -ENOIOCTLCMD)
837 return ret;
838 }
839
840 return v4l2_subdev_call(sd, core, g_ctrl, ctrl);
841 }
842
843 static int soc_camera_s_ctrl(struct file *file, void *priv,
844 struct v4l2_control *ctrl)
845 {
846 struct soc_camera_device *icd = file->private_data;
847 struct soc_camera_host *ici = to_soc_camera_host(icd->dev.parent);
848 struct v4l2_subdev *sd = soc_camera_to_subdev(icd);
849 int ret;
850
851 WARN_ON(priv != file->private_data);
852
853 if (ici->ops->set_ctrl) {
854 ret = ici->ops->set_ctrl(icd, ctrl);
855 if (ret != -ENOIOCTLCMD)
856 return ret;
857 }
858
859 return v4l2_subdev_call(sd, core, s_ctrl, ctrl);
860 }
861
862 static int soc_camera_cropcap(struct file *file, void *fh,
863 struct v4l2_cropcap *a)
864 {
865 struct soc_camera_device *icd = file->private_data;
866 struct soc_camera_host *ici = to_soc_camera_host(icd->dev.parent);
867
868 return ici->ops->cropcap(icd, a);
869 }
870
871 static int soc_camera_g_crop(struct file *file, void *fh,
872 struct v4l2_crop *a)
873 {
874 struct soc_camera_device *icd = file->private_data;
875 struct soc_camera_host *ici = to_soc_camera_host(icd->dev.parent);
876 int ret;
877
878 ret = ici->ops->get_crop(icd, a);
879
880 return ret;
881 }
882
883 /*
884 * According to the V4L2 API, drivers shall not update the struct v4l2_crop
885 * argument with the actual geometry, instead, the user shall use G_CROP to
886 * retrieve it.
887 */
888 static int soc_camera_s_crop(struct file *file, void *fh,
889 struct v4l2_crop *a)
890 {
891 struct soc_camera_device *icd = file->private_data;
892 struct soc_camera_host *ici = to_soc_camera_host(icd->dev.parent);
893 struct v4l2_rect *rect = &a->c;
894 struct v4l2_crop current_crop;
895 int ret;
896
897 if (a->type != V4L2_BUF_TYPE_VIDEO_CAPTURE)
898 return -EINVAL;
899
900 dev_dbg(&icd->dev, "S_CROP(%ux%u@%u:%u)\n",
901 rect->width, rect->height, rect->left, rect->top);
902
903 /* If get_crop fails, we'll let host and / or client drivers decide */
904 ret = ici->ops->get_crop(icd, &current_crop);
905
906 /* Prohibit window size change with initialised buffers */
907 if (ret < 0) {
908 dev_err(&icd->dev,
909 "S_CROP denied: getting current crop failed\n");
910 } else if ((a->c.width == current_crop.c.width &&
911 a->c.height == current_crop.c.height) ||
912 !is_streaming(ici, icd)) {
913 /* same size or not streaming - use .set_crop() */
914 ret = ici->ops->set_crop(icd, a);
915 } else if (ici->ops->set_livecrop) {
916 ret = ici->ops->set_livecrop(icd, a);
917 } else {
918 dev_err(&icd->dev,
919 "S_CROP denied: queue initialised and sizes differ\n");
920 ret = -EBUSY;
921 }
922
923 return ret;
924 }
925
926 static int soc_camera_g_parm(struct file *file, void *fh,
927 struct v4l2_streamparm *a)
928 {
929 struct soc_camera_device *icd = file->private_data;
930 struct soc_camera_host *ici = to_soc_camera_host(icd->dev.parent);
931
932 if (ici->ops->get_parm)
933 return ici->ops->get_parm(icd, a);
934
935 return -ENOIOCTLCMD;
936 }
937
938 static int soc_camera_s_parm(struct file *file, void *fh,
939 struct v4l2_streamparm *a)
940 {
941 struct soc_camera_device *icd = file->private_data;
942 struct soc_camera_host *ici = to_soc_camera_host(icd->dev.parent);
943
944 if (ici->ops->set_parm)
945 return ici->ops->set_parm(icd, a);
946
947 return -ENOIOCTLCMD;
948 }
949
950 static int soc_camera_g_chip_ident(struct file *file, void *fh,
951 struct v4l2_dbg_chip_ident *id)
952 {
953 struct soc_camera_device *icd = file->private_data;
954 struct v4l2_subdev *sd = soc_camera_to_subdev(icd);
955
956 return v4l2_subdev_call(sd, core, g_chip_ident, id);
957 }
958
959 #ifdef CONFIG_VIDEO_ADV_DEBUG
960 static int soc_camera_g_register(struct file *file, void *fh,
961 struct v4l2_dbg_register *reg)
962 {
963 struct soc_camera_device *icd = file->private_data;
964 struct v4l2_subdev *sd = soc_camera_to_subdev(icd);
965
966 return v4l2_subdev_call(sd, core, g_register, reg);
967 }
968
969 static int soc_camera_s_register(struct file *file, void *fh,
970 struct v4l2_dbg_register *reg)
971 {
972 struct soc_camera_device *icd = file->private_data;
973 struct v4l2_subdev *sd = soc_camera_to_subdev(icd);
974
975 return v4l2_subdev_call(sd, core, s_register, reg);
976 }
977 #endif
978
979 /* So far this function cannot fail */
980 static void scan_add_host(struct soc_camera_host *ici)
981 {
982 struct soc_camera_device *icd;
983
984 mutex_lock(&list_lock);
985
986 list_for_each_entry(icd, &devices, list) {
987 if (icd->iface == ici->nr) {
988 int ret;
989 icd->dev.parent = ici->v4l2_dev.dev;
990 dev_set_name(&icd->dev, "%u-%u", icd->iface,
991 icd->devnum);
992 ret = device_register(&icd->dev);
993 if (ret < 0) {
994 icd->dev.parent = NULL;
995 dev_err(&icd->dev,
996 "Cannot register device: %d\n", ret);
997 }
998 }
999 }
1000
1001 mutex_unlock(&list_lock);
1002 }
1003
1004 #ifdef CONFIG_I2C_BOARDINFO
1005 static int soc_camera_init_i2c(struct soc_camera_device *icd,
1006 struct soc_camera_link *icl)
1007 {
1008 struct i2c_client *client;
1009 struct soc_camera_host *ici = to_soc_camera_host(icd->dev.parent);
1010 struct i2c_adapter *adap = i2c_get_adapter(icl->i2c_adapter_id);
1011 struct v4l2_subdev *subdev;
1012
1013 if (!adap) {
1014 dev_err(&icd->dev, "Cannot get I2C adapter #%d. No driver?\n",
1015 icl->i2c_adapter_id);
1016 goto ei2cga;
1017 }
1018
1019 icl->board_info->platform_data = icd;
1020
1021 subdev = v4l2_i2c_new_subdev_board(&ici->v4l2_dev, adap,
1022 icl->board_info, NULL);
1023 if (!subdev)
1024 goto ei2cnd;
1025
1026 client = v4l2_get_subdevdata(subdev);
1027
1028 /* Use to_i2c_client(dev) to recover the i2c client */
1029 dev_set_drvdata(&icd->dev, &client->dev);
1030
1031 return 0;
1032 ei2cnd:
1033 i2c_put_adapter(adap);
1034 ei2cga:
1035 return -ENODEV;
1036 }
1037
1038 static void soc_camera_free_i2c(struct soc_camera_device *icd)
1039 {
1040 struct i2c_client *client =
1041 to_i2c_client(to_soc_camera_control(icd));
1042 struct i2c_adapter *adap = client->adapter;
1043 dev_set_drvdata(&icd->dev, NULL);
1044 v4l2_device_unregister_subdev(i2c_get_clientdata(client));
1045 i2c_unregister_device(client);
1046 i2c_put_adapter(adap);
1047 }
1048 #else
1049 #define soc_camera_init_i2c(icd, icl) (-ENODEV)
1050 #define soc_camera_free_i2c(icd) do {} while (0)
1051 #endif
1052
1053 static int soc_camera_video_start(struct soc_camera_device *icd);
1054 static int video_dev_create(struct soc_camera_device *icd);
1055 /* Called during host-driver probe */
1056 static int soc_camera_probe(struct device *dev)
1057 {
1058 struct soc_camera_device *icd = to_soc_camera_dev(dev);
1059 struct soc_camera_host *ici = to_soc_camera_host(dev->parent);
1060 struct soc_camera_link *icl = to_soc_camera_link(icd);
1061 struct device *control = NULL;
1062 struct v4l2_subdev *sd;
1063 struct v4l2_mbus_framefmt mf;
1064 int ret;
1065
1066 dev_info(dev, "Probing %s\n", dev_name(dev));
1067
1068 ret = regulator_bulk_get(icd->pdev, icl->num_regulators,
1069 icl->regulators);
1070 if (ret < 0)
1071 goto ereg;
1072
1073 ret = soc_camera_power_set(icd, icl, 1);
1074 if (ret < 0)
1075 goto epower;
1076
1077 /* The camera could have been already on, try to reset */
1078 if (icl->reset)
1079 icl->reset(icd->pdev);
1080
1081 ret = ici->ops->add(icd);
1082 if (ret < 0)
1083 goto eadd;
1084
1085 /* Must have icd->vdev before registering the device */
1086 ret = video_dev_create(icd);
1087 if (ret < 0)
1088 goto evdc;
1089
1090 /* Non-i2c cameras, e.g., soc_camera_platform, have no board_info */
1091 if (icl->board_info) {
1092 ret = soc_camera_init_i2c(icd, icl);
1093 if (ret < 0)
1094 goto eadddev;
1095 } else if (!icl->add_device || !icl->del_device) {
1096 ret = -EINVAL;
1097 goto eadddev;
1098 } else {
1099 if (icl->module_name)
1100 ret = request_module(icl->module_name);
1101
1102 ret = icl->add_device(icl, &icd->dev);
1103 if (ret < 0)
1104 goto eadddev;
1105
1106 /*
1107 * FIXME: this is racy, have to use driver-binding notification,
1108 * when it is available
1109 */
1110 control = to_soc_camera_control(icd);
1111 if (!control || !control->driver || !dev_get_drvdata(control) ||
1112 !try_module_get(control->driver->owner)) {
1113 icl->del_device(icl);
1114 goto enodrv;
1115 }
1116 }
1117
1118 sd = soc_camera_to_subdev(icd);
1119 sd->grp_id = (long)icd;
1120
1121 /* At this point client .probe() should have run already */
1122 ret = soc_camera_init_user_formats(icd);
1123 if (ret < 0)
1124 goto eiufmt;
1125
1126 icd->field = V4L2_FIELD_ANY;
1127
1128 icd->vdev->lock = &icd->video_lock;
1129
1130 /*
1131 * ..._video_start() will create a device node, video_register_device()
1132 * itself is protected against concurrent open() calls, but we also have
1133 * to protect our data.
1134 */
1135 mutex_lock(&icd->video_lock);
1136
1137 ret = soc_camera_video_start(icd);
1138 if (ret < 0)
1139 goto evidstart;
1140
1141 /* Try to improve our guess of a reasonable window format */
1142 if (!v4l2_subdev_call(sd, video, g_mbus_fmt, &mf)) {
1143 icd->user_width = mf.width;
1144 icd->user_height = mf.height;
1145 icd->colorspace = mf.colorspace;
1146 icd->field = mf.field;
1147 }
1148
1149 /* Do we have to sysfs_remove_link() before device_unregister()? */
1150 if (sysfs_create_link(&icd->dev.kobj, &to_soc_camera_control(icd)->kobj,
1151 "control"))
1152 dev_warn(&icd->dev, "Failed creating the control symlink\n");
1153
1154 ici->ops->remove(icd);
1155
1156 soc_camera_power_set(icd, icl, 0);
1157
1158 mutex_unlock(&icd->video_lock);
1159
1160 return 0;
1161
1162 evidstart:
1163 mutex_unlock(&icd->video_lock);
1164 soc_camera_free_user_formats(icd);
1165 eiufmt:
1166 if (icl->board_info) {
1167 soc_camera_free_i2c(icd);
1168 } else {
1169 icl->del_device(icl);
1170 module_put(control->driver->owner);
1171 }
1172 enodrv:
1173 eadddev:
1174 video_device_release(icd->vdev);
1175 evdc:
1176 ici->ops->remove(icd);
1177 eadd:
1178 soc_camera_power_set(icd, icl, 0);
1179 epower:
1180 regulator_bulk_free(icl->num_regulators, icl->regulators);
1181 ereg:
1182 return ret;
1183 }
1184
1185 /*
1186 * This is called on device_unregister, which only means we have to disconnect
1187 * from the host, but not remove ourselves from the device list
1188 */
1189 static int soc_camera_remove(struct device *dev)
1190 {
1191 struct soc_camera_device *icd = to_soc_camera_dev(dev);
1192 struct soc_camera_link *icl = to_soc_camera_link(icd);
1193 struct video_device *vdev = icd->vdev;
1194
1195 BUG_ON(!dev->parent);
1196
1197 if (vdev) {
1198 video_unregister_device(vdev);
1199 icd->vdev = NULL;
1200 }
1201
1202 if (icl->board_info) {
1203 soc_camera_free_i2c(icd);
1204 } else {
1205 struct device_driver *drv = to_soc_camera_control(icd) ?
1206 to_soc_camera_control(icd)->driver : NULL;
1207 if (drv) {
1208 icl->del_device(icl);
1209 module_put(drv->owner);
1210 }
1211 }
1212 soc_camera_free_user_formats(icd);
1213
1214 regulator_bulk_free(icl->num_regulators, icl->regulators);
1215
1216 return 0;
1217 }
1218
1219 static int soc_camera_suspend(struct device *dev, pm_message_t state)
1220 {
1221 struct soc_camera_device *icd = to_soc_camera_dev(dev);
1222 struct soc_camera_host *ici = to_soc_camera_host(icd->dev.parent);
1223 int ret = 0;
1224
1225 if (ici->ops->suspend)
1226 ret = ici->ops->suspend(icd, state);
1227
1228 return ret;
1229 }
1230
1231 static int soc_camera_resume(struct device *dev)
1232 {
1233 struct soc_camera_device *icd = to_soc_camera_dev(dev);
1234 struct soc_camera_host *ici = to_soc_camera_host(icd->dev.parent);
1235 int ret = 0;
1236
1237 if (ici->ops->resume)
1238 ret = ici->ops->resume(icd);
1239
1240 return ret;
1241 }
1242
1243 struct bus_type soc_camera_bus_type = {
1244 .name = "soc-camera",
1245 .probe = soc_camera_probe,
1246 .remove = soc_camera_remove,
1247 .suspend = soc_camera_suspend,
1248 .resume = soc_camera_resume,
1249 };
1250 EXPORT_SYMBOL_GPL(soc_camera_bus_type);
1251
1252 static struct device_driver ic_drv = {
1253 .name = "camera",
1254 .bus = &soc_camera_bus_type,
1255 .owner = THIS_MODULE,
1256 };
1257
1258 static void dummy_release(struct device *dev)
1259 {
1260 }
1261
1262 static int default_cropcap(struct soc_camera_device *icd,
1263 struct v4l2_cropcap *a)
1264 {
1265 struct v4l2_subdev *sd = soc_camera_to_subdev(icd);
1266 return v4l2_subdev_call(sd, video, cropcap, a);
1267 }
1268
1269 static int default_g_crop(struct soc_camera_device *icd, struct v4l2_crop *a)
1270 {
1271 struct v4l2_subdev *sd = soc_camera_to_subdev(icd);
1272 return v4l2_subdev_call(sd, video, g_crop, a);
1273 }
1274
1275 static int default_s_crop(struct soc_camera_device *icd, struct v4l2_crop *a)
1276 {
1277 struct v4l2_subdev *sd = soc_camera_to_subdev(icd);
1278 return v4l2_subdev_call(sd, video, s_crop, a);
1279 }
1280
1281 static int default_g_parm(struct soc_camera_device *icd,
1282 struct v4l2_streamparm *parm)
1283 {
1284 struct v4l2_subdev *sd = soc_camera_to_subdev(icd);
1285 return v4l2_subdev_call(sd, video, g_parm, parm);
1286 }
1287
1288 static int default_s_parm(struct soc_camera_device *icd,
1289 struct v4l2_streamparm *parm)
1290 {
1291 struct v4l2_subdev *sd = soc_camera_to_subdev(icd);
1292 return v4l2_subdev_call(sd, video, s_parm, parm);
1293 }
1294
1295 static int default_enum_fsizes(struct soc_camera_device *icd,
1296 struct v4l2_frmsizeenum *fsize)
1297 {
1298 int ret;
1299 struct v4l2_subdev *sd = soc_camera_to_subdev(icd);
1300 const struct soc_camera_format_xlate *xlate;
1301 __u32 pixfmt = fsize->pixel_format;
1302 struct v4l2_frmsizeenum fsize_mbus = *fsize;
1303
1304 xlate = soc_camera_xlate_by_fourcc(icd, pixfmt);
1305 if (!xlate)
1306 return -EINVAL;
1307 /* map xlate-code to pixel_format, sensor only handle xlate-code*/
1308 fsize_mbus.pixel_format = xlate->code;
1309
1310 ret = v4l2_subdev_call(sd, video, enum_mbus_fsizes, &fsize_mbus);
1311 if (ret < 0)
1312 return ret;
1313
1314 *fsize = fsize_mbus;
1315 fsize->pixel_format = pixfmt;
1316
1317 return 0;
1318 }
1319
1320 static void soc_camera_device_init(struct device *dev, void *pdata)
1321 {
1322 dev->platform_data = pdata;
1323 dev->bus = &soc_camera_bus_type;
1324 dev->release = dummy_release;
1325 }
1326
1327 int soc_camera_host_register(struct soc_camera_host *ici)
1328 {
1329 struct soc_camera_host *ix;
1330 int ret;
1331
1332 if (!ici || !ici->ops ||
1333 !ici->ops->try_fmt ||
1334 !ici->ops->set_fmt ||
1335 !ici->ops->set_bus_param ||
1336 !ici->ops->querycap ||
1337 ((!ici->ops->init_videobuf ||
1338 !ici->ops->reqbufs) &&
1339 !ici->ops->init_videobuf2) ||
1340 !ici->ops->add ||
1341 !ici->ops->remove ||
1342 !ici->ops->poll ||
1343 !ici->v4l2_dev.dev)
1344 return -EINVAL;
1345
1346 if (!ici->ops->set_crop)
1347 ici->ops->set_crop = default_s_crop;
1348 if (!ici->ops->get_crop)
1349 ici->ops->get_crop = default_g_crop;
1350 if (!ici->ops->cropcap)
1351 ici->ops->cropcap = default_cropcap;
1352 if (!ici->ops->set_parm)
1353 ici->ops->set_parm = default_s_parm;
1354 if (!ici->ops->get_parm)
1355 ici->ops->get_parm = default_g_parm;
1356 if (!ici->ops->enum_fsizes)
1357 ici->ops->enum_fsizes = default_enum_fsizes;
1358
1359 mutex_lock(&list_lock);
1360 list_for_each_entry(ix, &hosts, list) {
1361 if (ix->nr == ici->nr) {
1362 ret = -EBUSY;
1363 goto edevreg;
1364 }
1365 }
1366
1367 ret = v4l2_device_register(ici->v4l2_dev.dev, &ici->v4l2_dev);
1368 if (ret < 0)
1369 goto edevreg;
1370
1371 list_add_tail(&ici->list, &hosts);
1372 mutex_unlock(&list_lock);
1373
1374 scan_add_host(ici);
1375
1376 return 0;
1377
1378 edevreg:
1379 mutex_unlock(&list_lock);
1380 return ret;
1381 }
1382 EXPORT_SYMBOL(soc_camera_host_register);
1383
1384 /* Unregister all clients! */
1385 void soc_camera_host_unregister(struct soc_camera_host *ici)
1386 {
1387 struct soc_camera_device *icd;
1388
1389 mutex_lock(&list_lock);
1390
1391 list_del(&ici->list);
1392
1393 list_for_each_entry(icd, &devices, list) {
1394 if (icd->iface == ici->nr) {
1395 void *pdata = icd->dev.platform_data;
1396 /* The bus->remove will be called */
1397 device_unregister(&icd->dev);
1398 /*
1399 * Not before device_unregister(), .remove
1400 * needs parent to call ici->ops->remove().
1401 * If the host module is loaded again, device_register()
1402 * would complain "already initialised," since 2.6.32
1403 * this is also needed to prevent use-after-free of the
1404 * device private data.
1405 */
1406 memset(&icd->dev, 0, sizeof(icd->dev));
1407 soc_camera_device_init(&icd->dev, pdata);
1408 }
1409 }
1410
1411 mutex_unlock(&list_lock);
1412
1413 v4l2_device_unregister(&ici->v4l2_dev);
1414 }
1415 EXPORT_SYMBOL(soc_camera_host_unregister);
1416
1417 /* Image capture device */
1418 static int soc_camera_device_register(struct soc_camera_device *icd)
1419 {
1420 struct soc_camera_device *ix;
1421 int num = -1, i;
1422
1423 for (i = 0; i < 256 && num < 0; i++) {
1424 num = i;
1425 /* Check if this index is available on this interface */
1426 list_for_each_entry(ix, &devices, list) {
1427 if (ix->iface == icd->iface && ix->devnum == i) {
1428 num = -1;
1429 break;
1430 }
1431 }
1432 }
1433
1434 if (num < 0)
1435 /*
1436 * ok, we have 256 cameras on this host...
1437 * man, stay reasonable...
1438 */
1439 return -ENOMEM;
1440
1441 icd->devnum = num;
1442 icd->use_count = 0;
1443 icd->host_priv = NULL;
1444 mutex_init(&icd->video_lock);
1445
1446 list_add_tail(&icd->list, &devices);
1447
1448 return 0;
1449 }
1450
1451 static void soc_camera_device_unregister(struct soc_camera_device *icd)
1452 {
1453 list_del(&icd->list);
1454 }
1455
1456 static const struct v4l2_ioctl_ops soc_camera_ioctl_ops = {
1457 .vidioc_querycap = soc_camera_querycap,
1458 .vidioc_g_fmt_vid_cap = soc_camera_g_fmt_vid_cap,
1459 .vidioc_enum_fmt_vid_cap = soc_camera_enum_fmt_vid_cap,
1460 .vidioc_s_fmt_vid_cap = soc_camera_s_fmt_vid_cap,
1461 .vidioc_enum_input = soc_camera_enum_input,
1462 .vidioc_g_input = soc_camera_g_input,
1463 .vidioc_s_input = soc_camera_s_input,
1464 .vidioc_s_std = soc_camera_s_std,
1465 .vidioc_enum_framesizes = soc_camera_enum_fsizes,
1466 .vidioc_reqbufs = soc_camera_reqbufs,
1467 .vidioc_try_fmt_vid_cap = soc_camera_try_fmt_vid_cap,
1468 .vidioc_querybuf = soc_camera_querybuf,
1469 .vidioc_qbuf = soc_camera_qbuf,
1470 .vidioc_dqbuf = soc_camera_dqbuf,
1471 .vidioc_streamon = soc_camera_streamon,
1472 .vidioc_streamoff = soc_camera_streamoff,
1473 .vidioc_queryctrl = soc_camera_queryctrl,
1474 .vidioc_g_ctrl = soc_camera_g_ctrl,
1475 .vidioc_s_ctrl = soc_camera_s_ctrl,
1476 .vidioc_cropcap = soc_camera_cropcap,
1477 .vidioc_g_crop = soc_camera_g_crop,
1478 .vidioc_s_crop = soc_camera_s_crop,
1479 .vidioc_g_parm = soc_camera_g_parm,
1480 .vidioc_s_parm = soc_camera_s_parm,
1481 .vidioc_g_chip_ident = soc_camera_g_chip_ident,
1482 #ifdef CONFIG_VIDEO_ADV_DEBUG
1483 .vidioc_g_register = soc_camera_g_register,
1484 .vidioc_s_register = soc_camera_s_register,
1485 #endif
1486 };
1487
1488 static int video_dev_create(struct soc_camera_device *icd)
1489 {
1490 struct soc_camera_host *ici = to_soc_camera_host(icd->dev.parent);
1491 struct video_device *vdev = video_device_alloc();
1492
1493 if (!vdev)
1494 return -ENOMEM;
1495
1496 strlcpy(vdev->name, ici->drv_name, sizeof(vdev->name));
1497
1498 vdev->parent = &icd->dev;
1499 vdev->current_norm = V4L2_STD_UNKNOWN;
1500 vdev->fops = &soc_camera_fops;
1501 vdev->ioctl_ops = &soc_camera_ioctl_ops;
1502 vdev->release = video_device_release;
1503 vdev->tvnorms = V4L2_STD_UNKNOWN;
1504
1505 icd->vdev = vdev;
1506
1507 return 0;
1508 }
1509
1510 /*
1511 * Called from soc_camera_probe() above (with .video_lock held???)
1512 */
1513 static int soc_camera_video_start(struct soc_camera_device *icd)
1514 {
1515 const struct device_type *type = icd->vdev->dev.type;
1516 int ret;
1517
1518 if (!icd->dev.parent)
1519 return -ENODEV;
1520
1521 if (!icd->ops ||
1522 !icd->ops->query_bus_param ||
1523 !icd->ops->set_bus_param)
1524 return -EINVAL;
1525
1526 ret = video_register_device(icd->vdev, VFL_TYPE_GRABBER, -1);
1527 if (ret < 0) {
1528 dev_err(&icd->dev, "video_register_device failed: %d\n", ret);
1529 return ret;
1530 }
1531
1532 /* Restore device type, possibly set by the subdevice driver */
1533 icd->vdev->dev.type = type;
1534
1535 return 0;
1536 }
1537
1538 static int __devinit soc_camera_pdrv_probe(struct platform_device *pdev)
1539 {
1540 struct soc_camera_link *icl = pdev->dev.platform_data;
1541 struct soc_camera_device *icd;
1542 int ret;
1543
1544 if (!icl)
1545 return -EINVAL;
1546
1547 icd = kzalloc(sizeof(*icd), GFP_KERNEL);
1548 if (!icd)
1549 return -ENOMEM;
1550
1551 icd->iface = icl->bus_id;
1552 icd->pdev = &pdev->dev;
1553 platform_set_drvdata(pdev, icd);
1554
1555 ret = soc_camera_device_register(icd);
1556 if (ret < 0)
1557 goto escdevreg;
1558
1559 soc_camera_device_init(&icd->dev, icl);
1560
1561 icd->user_width = DEFAULT_WIDTH;
1562 icd->user_height = DEFAULT_HEIGHT;
1563
1564 return 0;
1565
1566 escdevreg:
1567 kfree(icd);
1568
1569 return ret;
1570 }
1571
1572 /*
1573 * Only called on rmmod for each platform device, since they are not
1574 * hot-pluggable. Now we know, that all our users - hosts and devices have
1575 * been unloaded already
1576 */
1577 static int __devexit soc_camera_pdrv_remove(struct platform_device *pdev)
1578 {
1579 struct soc_camera_device *icd = platform_get_drvdata(pdev);
1580
1581 if (!icd)
1582 return -EINVAL;
1583
1584 soc_camera_device_unregister(icd);
1585
1586 kfree(icd);
1587
1588 return 0;
1589 }
1590
1591 static struct platform_driver __refdata soc_camera_pdrv = {
1592 .remove = __devexit_p(soc_camera_pdrv_remove),
1593 .driver = {
1594 .name = "soc-camera-pdrv",
1595 .owner = THIS_MODULE,
1596 },
1597 };
1598
1599 static int __init soc_camera_init(void)
1600 {
1601 int ret = bus_register(&soc_camera_bus_type);
1602 if (ret)
1603 return ret;
1604 ret = driver_register(&ic_drv);
1605 if (ret)
1606 goto edrvr;
1607
1608 ret = platform_driver_probe(&soc_camera_pdrv, soc_camera_pdrv_probe);
1609 if (ret)
1610 goto epdr;
1611
1612 return 0;
1613
1614 epdr:
1615 driver_unregister(&ic_drv);
1616 edrvr:
1617 bus_unregister(&soc_camera_bus_type);
1618 return ret;
1619 }
1620
1621 static void __exit soc_camera_exit(void)
1622 {
1623 platform_driver_unregister(&soc_camera_pdrv);
1624 driver_unregister(&ic_drv);
1625 bus_unregister(&soc_camera_bus_type);
1626 }
1627
1628 module_init(soc_camera_init);
1629 module_exit(soc_camera_exit);
1630
1631 MODULE_DESCRIPTION("Image capture bus driver");
1632 MODULE_AUTHOR("Guennadi Liakhovetski <kernel@pengutronix.de>");
1633 MODULE_LICENSE("GPL");
1634 MODULE_ALIAS("platform:soc-camera-pdrv");
kernel source for telekom puls (alcatel/mediatek)