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[media] v4l2-ctrls: add a filter function to v4l2_ctrl_add_handler
[GitHub/mt8127/android_kernel_alcatel_ttab.git] / drivers / media / platform / soc_camera / 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 int soc_camera_power_on(struct device *dev, struct soc_camera_link *icl)
54 {
55 int ret = regulator_bulk_enable(icl->num_regulators,
56 icl->regulators);
57 if (ret < 0) {
58 dev_err(dev, "Cannot enable regulators\n");
59 return ret;
60 }
61
62 if (icl->power) {
63 ret = icl->power(dev, 1);
64 if (ret < 0) {
65 dev_err(dev,
66 "Platform failed to power-on the camera.\n");
67 regulator_bulk_disable(icl->num_regulators,
68 icl->regulators);
69 }
70 }
71
72 return ret;
73 }
74 EXPORT_SYMBOL(soc_camera_power_on);
75
76 int soc_camera_power_off(struct device *dev, struct soc_camera_link *icl)
77 {
78 int ret = 0;
79 int err;
80
81 if (icl->power) {
82 err = icl->power(dev, 0);
83 if (err < 0) {
84 dev_err(dev,
85 "Platform failed to power-off the camera.\n");
86 ret = err;
87 }
88 }
89
90 err = regulator_bulk_disable(icl->num_regulators,
91 icl->regulators);
92 if (err < 0) {
93 dev_err(dev, "Cannot disable regulators\n");
94 ret = ret ? : err;
95 }
96
97 return ret;
98 }
99 EXPORT_SYMBOL(soc_camera_power_off);
100
101 static int __soc_camera_power_on(struct soc_camera_device *icd)
102 {
103 struct v4l2_subdev *sd = soc_camera_to_subdev(icd);
104 int ret;
105
106 ret = v4l2_subdev_call(sd, core, s_power, 1);
107 if (ret < 0 && ret != -ENOIOCTLCMD && ret != -ENODEV)
108 return ret;
109
110 return 0;
111 }
112
113 static int __soc_camera_power_off(struct soc_camera_device *icd)
114 {
115 struct v4l2_subdev *sd = soc_camera_to_subdev(icd);
116 int ret;
117
118 ret = v4l2_subdev_call(sd, core, s_power, 0);
119 if (ret < 0 && ret != -ENOIOCTLCMD && ret != -ENODEV)
120 return ret;
121
122 return 0;
123 }
124
125 const struct soc_camera_format_xlate *soc_camera_xlate_by_fourcc(
126 struct soc_camera_device *icd, unsigned int fourcc)
127 {
128 unsigned int i;
129
130 for (i = 0; i < icd->num_user_formats; i++)
131 if (icd->user_formats[i].host_fmt->fourcc == fourcc)
132 return icd->user_formats + i;
133 return NULL;
134 }
135 EXPORT_SYMBOL(soc_camera_xlate_by_fourcc);
136
137 /**
138 * soc_camera_apply_board_flags() - apply platform SOCAM_SENSOR_INVERT_* flags
139 * @icl: camera platform parameters
140 * @cfg: media bus configuration
141 * @return: resulting flags
142 */
143 unsigned long soc_camera_apply_board_flags(struct soc_camera_link *icl,
144 const struct v4l2_mbus_config *cfg)
145 {
146 unsigned long f, flags = cfg->flags;
147
148 /* If only one of the two polarities is supported, switch to the opposite */
149 if (icl->flags & SOCAM_SENSOR_INVERT_HSYNC) {
150 f = flags & (V4L2_MBUS_HSYNC_ACTIVE_HIGH | V4L2_MBUS_HSYNC_ACTIVE_LOW);
151 if (f == V4L2_MBUS_HSYNC_ACTIVE_HIGH || f == V4L2_MBUS_HSYNC_ACTIVE_LOW)
152 flags ^= V4L2_MBUS_HSYNC_ACTIVE_HIGH | V4L2_MBUS_HSYNC_ACTIVE_LOW;
153 }
154
155 if (icl->flags & SOCAM_SENSOR_INVERT_VSYNC) {
156 f = flags & (V4L2_MBUS_VSYNC_ACTIVE_HIGH | V4L2_MBUS_VSYNC_ACTIVE_LOW);
157 if (f == V4L2_MBUS_VSYNC_ACTIVE_HIGH || f == V4L2_MBUS_VSYNC_ACTIVE_LOW)
158 flags ^= V4L2_MBUS_VSYNC_ACTIVE_HIGH | V4L2_MBUS_VSYNC_ACTIVE_LOW;
159 }
160
161 if (icl->flags & SOCAM_SENSOR_INVERT_PCLK) {
162 f = flags & (V4L2_MBUS_PCLK_SAMPLE_RISING | V4L2_MBUS_PCLK_SAMPLE_FALLING);
163 if (f == V4L2_MBUS_PCLK_SAMPLE_RISING || f == V4L2_MBUS_PCLK_SAMPLE_FALLING)
164 flags ^= V4L2_MBUS_PCLK_SAMPLE_RISING | V4L2_MBUS_PCLK_SAMPLE_FALLING;
165 }
166
167 return flags;
168 }
169 EXPORT_SYMBOL(soc_camera_apply_board_flags);
170
171 #define pixfmtstr(x) (x) & 0xff, ((x) >> 8) & 0xff, ((x) >> 16) & 0xff, \
172 ((x) >> 24) & 0xff
173
174 static int soc_camera_try_fmt(struct soc_camera_device *icd,
175 struct v4l2_format *f)
176 {
177 struct soc_camera_host *ici = to_soc_camera_host(icd->parent);
178 const struct soc_camera_format_xlate *xlate;
179 struct v4l2_pix_format *pix = &f->fmt.pix;
180 int ret;
181
182 dev_dbg(icd->pdev, "TRY_FMT(%c%c%c%c, %ux%u)\n",
183 pixfmtstr(pix->pixelformat), pix->width, pix->height);
184
185 if (pix->pixelformat != V4L2_PIX_FMT_JPEG &&
186 !(ici->capabilities & SOCAM_HOST_CAP_STRIDE)) {
187 pix->bytesperline = 0;
188 pix->sizeimage = 0;
189 }
190
191 ret = ici->ops->try_fmt(icd, f);
192 if (ret < 0)
193 return ret;
194
195 xlate = soc_camera_xlate_by_fourcc(icd, pix->pixelformat);
196 if (!xlate)
197 return -EINVAL;
198
199 ret = soc_mbus_bytes_per_line(pix->width, xlate->host_fmt);
200 if (ret < 0)
201 return ret;
202
203 pix->bytesperline = max_t(u32, pix->bytesperline, ret);
204
205 ret = soc_mbus_image_size(xlate->host_fmt, pix->bytesperline,
206 pix->height);
207 if (ret < 0)
208 return ret;
209
210 pix->sizeimage = max_t(u32, pix->sizeimage, ret);
211
212 return 0;
213 }
214
215 static int soc_camera_try_fmt_vid_cap(struct file *file, void *priv,
216 struct v4l2_format *f)
217 {
218 struct soc_camera_device *icd = file->private_data;
219
220 WARN_ON(priv != file->private_data);
221
222 /* Only single-plane capture is supported so far */
223 if (f->type != V4L2_BUF_TYPE_VIDEO_CAPTURE)
224 return -EINVAL;
225
226 /* limit format to hardware capabilities */
227 return soc_camera_try_fmt(icd, f);
228 }
229
230 static int soc_camera_enum_input(struct file *file, void *priv,
231 struct v4l2_input *inp)
232 {
233 if (inp->index != 0)
234 return -EINVAL;
235
236 /* default is camera */
237 inp->type = V4L2_INPUT_TYPE_CAMERA;
238 inp->std = V4L2_STD_UNKNOWN;
239 strcpy(inp->name, "Camera");
240
241 return 0;
242 }
243
244 static int soc_camera_g_input(struct file *file, void *priv, unsigned int *i)
245 {
246 *i = 0;
247
248 return 0;
249 }
250
251 static int soc_camera_s_input(struct file *file, void *priv, unsigned int i)
252 {
253 if (i > 0)
254 return -EINVAL;
255
256 return 0;
257 }
258
259 static int soc_camera_s_std(struct file *file, void *priv, v4l2_std_id *a)
260 {
261 struct soc_camera_device *icd = file->private_data;
262 struct v4l2_subdev *sd = soc_camera_to_subdev(icd);
263
264 return v4l2_subdev_call(sd, core, s_std, *a);
265 }
266
267 static int soc_camera_g_std(struct file *file, void *priv, v4l2_std_id *a)
268 {
269 struct soc_camera_device *icd = file->private_data;
270 struct v4l2_subdev *sd = soc_camera_to_subdev(icd);
271
272 return v4l2_subdev_call(sd, core, g_std, a);
273 }
274
275 static int soc_camera_enum_framesizes(struct file *file, void *fh,
276 struct v4l2_frmsizeenum *fsize)
277 {
278 struct soc_camera_device *icd = file->private_data;
279 struct soc_camera_host *ici = to_soc_camera_host(icd->parent);
280
281 return ici->ops->enum_framesizes(icd, fsize);
282 }
283
284 static int soc_camera_reqbufs(struct file *file, void *priv,
285 struct v4l2_requestbuffers *p)
286 {
287 int ret;
288 struct soc_camera_device *icd = file->private_data;
289 struct soc_camera_host *ici = to_soc_camera_host(icd->parent);
290
291 WARN_ON(priv != file->private_data);
292
293 if (icd->streamer && icd->streamer != file)
294 return -EBUSY;
295
296 if (ici->ops->init_videobuf) {
297 ret = videobuf_reqbufs(&icd->vb_vidq, p);
298 if (ret < 0)
299 return ret;
300
301 ret = ici->ops->reqbufs(icd, p);
302 } else {
303 ret = vb2_reqbufs(&icd->vb2_vidq, p);
304 }
305
306 if (!ret && !icd->streamer)
307 icd->streamer = file;
308
309 return ret;
310 }
311
312 static int soc_camera_querybuf(struct file *file, void *priv,
313 struct v4l2_buffer *p)
314 {
315 struct soc_camera_device *icd = file->private_data;
316 struct soc_camera_host *ici = to_soc_camera_host(icd->parent);
317
318 WARN_ON(priv != file->private_data);
319
320 if (ici->ops->init_videobuf)
321 return videobuf_querybuf(&icd->vb_vidq, p);
322 else
323 return vb2_querybuf(&icd->vb2_vidq, p);
324 }
325
326 static int soc_camera_qbuf(struct file *file, void *priv,
327 struct v4l2_buffer *p)
328 {
329 struct soc_camera_device *icd = file->private_data;
330 struct soc_camera_host *ici = to_soc_camera_host(icd->parent);
331
332 WARN_ON(priv != file->private_data);
333
334 if (icd->streamer != file)
335 return -EBUSY;
336
337 if (ici->ops->init_videobuf)
338 return videobuf_qbuf(&icd->vb_vidq, p);
339 else
340 return vb2_qbuf(&icd->vb2_vidq, p);
341 }
342
343 static int soc_camera_dqbuf(struct file *file, void *priv,
344 struct v4l2_buffer *p)
345 {
346 struct soc_camera_device *icd = file->private_data;
347 struct soc_camera_host *ici = to_soc_camera_host(icd->parent);
348
349 WARN_ON(priv != file->private_data);
350
351 if (icd->streamer != file)
352 return -EBUSY;
353
354 if (ici->ops->init_videobuf)
355 return videobuf_dqbuf(&icd->vb_vidq, p, file->f_flags & O_NONBLOCK);
356 else
357 return vb2_dqbuf(&icd->vb2_vidq, p, file->f_flags & O_NONBLOCK);
358 }
359
360 static int soc_camera_create_bufs(struct file *file, void *priv,
361 struct v4l2_create_buffers *create)
362 {
363 struct soc_camera_device *icd = file->private_data;
364 struct soc_camera_host *ici = to_soc_camera_host(icd->parent);
365
366 /* videobuf2 only */
367 if (ici->ops->init_videobuf)
368 return -EINVAL;
369 else
370 return vb2_create_bufs(&icd->vb2_vidq, create);
371 }
372
373 static int soc_camera_prepare_buf(struct file *file, void *priv,
374 struct v4l2_buffer *b)
375 {
376 struct soc_camera_device *icd = file->private_data;
377 struct soc_camera_host *ici = to_soc_camera_host(icd->parent);
378
379 /* videobuf2 only */
380 if (ici->ops->init_videobuf)
381 return -EINVAL;
382 else
383 return vb2_prepare_buf(&icd->vb2_vidq, b);
384 }
385
386 /* Always entered with .video_lock held */
387 static int soc_camera_init_user_formats(struct soc_camera_device *icd)
388 {
389 struct v4l2_subdev *sd = soc_camera_to_subdev(icd);
390 struct soc_camera_host *ici = to_soc_camera_host(icd->parent);
391 unsigned int i, fmts = 0, raw_fmts = 0;
392 int ret;
393 enum v4l2_mbus_pixelcode code;
394
395 while (!v4l2_subdev_call(sd, video, enum_mbus_fmt, raw_fmts, &code))
396 raw_fmts++;
397
398 if (!ici->ops->get_formats)
399 /*
400 * Fallback mode - the host will have to serve all
401 * sensor-provided formats one-to-one to the user
402 */
403 fmts = raw_fmts;
404 else
405 /*
406 * First pass - only count formats this host-sensor
407 * configuration can provide
408 */
409 for (i = 0; i < raw_fmts; i++) {
410 ret = ici->ops->get_formats(icd, i, NULL);
411 if (ret < 0)
412 return ret;
413 fmts += ret;
414 }
415
416 if (!fmts)
417 return -ENXIO;
418
419 icd->user_formats =
420 vmalloc(fmts * sizeof(struct soc_camera_format_xlate));
421 if (!icd->user_formats)
422 return -ENOMEM;
423
424 dev_dbg(icd->pdev, "Found %d supported formats.\n", fmts);
425
426 /* Second pass - actually fill data formats */
427 fmts = 0;
428 for (i = 0; i < raw_fmts; i++)
429 if (!ici->ops->get_formats) {
430 v4l2_subdev_call(sd, video, enum_mbus_fmt, i, &code);
431 icd->user_formats[fmts].host_fmt =
432 soc_mbus_get_fmtdesc(code);
433 if (icd->user_formats[fmts].host_fmt)
434 icd->user_formats[fmts++].code = code;
435 } else {
436 ret = ici->ops->get_formats(icd, i,
437 &icd->user_formats[fmts]);
438 if (ret < 0)
439 goto egfmt;
440 fmts += ret;
441 }
442
443 icd->num_user_formats = fmts;
444 icd->current_fmt = &icd->user_formats[0];
445
446 return 0;
447
448 egfmt:
449 vfree(icd->user_formats);
450 return ret;
451 }
452
453 /* Always entered with .video_lock held */
454 static void soc_camera_free_user_formats(struct soc_camera_device *icd)
455 {
456 struct soc_camera_host *ici = to_soc_camera_host(icd->parent);
457
458 if (ici->ops->put_formats)
459 ici->ops->put_formats(icd);
460 icd->current_fmt = NULL;
461 icd->num_user_formats = 0;
462 vfree(icd->user_formats);
463 icd->user_formats = NULL;
464 }
465
466 /* Called with .vb_lock held, or from the first open(2), see comment there */
467 static int soc_camera_set_fmt(struct soc_camera_device *icd,
468 struct v4l2_format *f)
469 {
470 struct soc_camera_host *ici = to_soc_camera_host(icd->parent);
471 struct v4l2_pix_format *pix = &f->fmt.pix;
472 int ret;
473
474 dev_dbg(icd->pdev, "S_FMT(%c%c%c%c, %ux%u)\n",
475 pixfmtstr(pix->pixelformat), pix->width, pix->height);
476
477 /* We always call try_fmt() before set_fmt() or set_crop() */
478 ret = soc_camera_try_fmt(icd, f);
479 if (ret < 0)
480 return ret;
481
482 ret = ici->ops->set_fmt(icd, f);
483 if (ret < 0) {
484 return ret;
485 } else if (!icd->current_fmt ||
486 icd->current_fmt->host_fmt->fourcc != pix->pixelformat) {
487 dev_err(icd->pdev,
488 "Host driver hasn't set up current format correctly!\n");
489 return -EINVAL;
490 }
491
492 icd->user_width = pix->width;
493 icd->user_height = pix->height;
494 icd->bytesperline = pix->bytesperline;
495 icd->sizeimage = pix->sizeimage;
496 icd->colorspace = pix->colorspace;
497 icd->field = pix->field;
498 if (ici->ops->init_videobuf)
499 icd->vb_vidq.field = pix->field;
500
501 dev_dbg(icd->pdev, "set width: %d height: %d\n",
502 icd->user_width, icd->user_height);
503
504 /* set physical bus parameters */
505 return ici->ops->set_bus_param(icd);
506 }
507
508 static int soc_camera_open(struct file *file)
509 {
510 struct video_device *vdev = video_devdata(file);
511 struct soc_camera_device *icd = dev_get_drvdata(vdev->parent);
512 struct soc_camera_link *icl = to_soc_camera_link(icd);
513 struct soc_camera_host *ici;
514 int ret;
515
516 if (!to_soc_camera_control(icd))
517 /* No device driver attached */
518 return -ENODEV;
519
520 ici = to_soc_camera_host(icd->parent);
521
522 if (mutex_lock_interruptible(&icd->video_lock))
523 return -ERESTARTSYS;
524 if (!try_module_get(ici->ops->owner)) {
525 dev_err(icd->pdev, "Couldn't lock capture bus driver.\n");
526 ret = -EINVAL;
527 goto emodule;
528 }
529
530 icd->use_count++;
531
532 /* Now we really have to activate the camera */
533 if (icd->use_count == 1) {
534 /* Restore parameters before the last close() per V4L2 API */
535 struct v4l2_format f = {
536 .type = V4L2_BUF_TYPE_VIDEO_CAPTURE,
537 .fmt.pix = {
538 .width = icd->user_width,
539 .height = icd->user_height,
540 .field = icd->field,
541 .colorspace = icd->colorspace,
542 .pixelformat =
543 icd->current_fmt->host_fmt->fourcc,
544 },
545 };
546
547 /* The camera could have been already on, try to reset */
548 if (icl->reset)
549 icl->reset(icd->pdev);
550
551 /* Don't mess with the host during probe */
552 mutex_lock(&ici->host_lock);
553 ret = ici->ops->add(icd);
554 mutex_unlock(&ici->host_lock);
555 if (ret < 0) {
556 dev_err(icd->pdev, "Couldn't activate the camera: %d\n", ret);
557 goto eiciadd;
558 }
559
560 ret = __soc_camera_power_on(icd);
561 if (ret < 0)
562 goto epower;
563
564 pm_runtime_enable(&icd->vdev->dev);
565 ret = pm_runtime_resume(&icd->vdev->dev);
566 if (ret < 0 && ret != -ENOSYS)
567 goto eresume;
568
569 /*
570 * Try to configure with default parameters. Notice: this is the
571 * very first open, so, we cannot race against other calls,
572 * apart from someone else calling open() simultaneously, but
573 * .video_lock is protecting us against it.
574 */
575 ret = soc_camera_set_fmt(icd, &f);
576 if (ret < 0)
577 goto esfmt;
578
579 if (ici->ops->init_videobuf) {
580 ici->ops->init_videobuf(&icd->vb_vidq, icd);
581 } else {
582 ret = ici->ops->init_videobuf2(&icd->vb2_vidq, icd);
583 if (ret < 0)
584 goto einitvb;
585 }
586 v4l2_ctrl_handler_setup(&icd->ctrl_handler);
587 }
588 mutex_unlock(&icd->video_lock);
589
590 file->private_data = icd;
591 dev_dbg(icd->pdev, "camera device open\n");
592
593 return 0;
594
595 /*
596 * First four errors are entered with the .video_lock held
597 * and use_count == 1
598 */
599 einitvb:
600 esfmt:
601 pm_runtime_disable(&icd->vdev->dev);
602 eresume:
603 __soc_camera_power_off(icd);
604 epower:
605 ici->ops->remove(icd);
606 eiciadd:
607 icd->use_count--;
608 module_put(ici->ops->owner);
609 emodule:
610 mutex_unlock(&icd->video_lock);
611
612 return ret;
613 }
614
615 static int soc_camera_close(struct file *file)
616 {
617 struct soc_camera_device *icd = file->private_data;
618 struct soc_camera_host *ici = to_soc_camera_host(icd->parent);
619
620 mutex_lock(&icd->video_lock);
621 icd->use_count--;
622 if (!icd->use_count) {
623 pm_runtime_suspend(&icd->vdev->dev);
624 pm_runtime_disable(&icd->vdev->dev);
625
626 if (ici->ops->init_videobuf2)
627 vb2_queue_release(&icd->vb2_vidq);
628 ici->ops->remove(icd);
629
630 __soc_camera_power_off(icd);
631 }
632
633 if (icd->streamer == file)
634 icd->streamer = NULL;
635 mutex_unlock(&icd->video_lock);
636
637 module_put(ici->ops->owner);
638
639 dev_dbg(icd->pdev, "camera device close\n");
640
641 return 0;
642 }
643
644 static ssize_t soc_camera_read(struct file *file, char __user *buf,
645 size_t count, loff_t *ppos)
646 {
647 struct soc_camera_device *icd = file->private_data;
648 int err = -EINVAL;
649
650 dev_err(icd->pdev, "camera device read not implemented\n");
651
652 return err;
653 }
654
655 static int soc_camera_mmap(struct file *file, struct vm_area_struct *vma)
656 {
657 struct soc_camera_device *icd = file->private_data;
658 struct soc_camera_host *ici = to_soc_camera_host(icd->parent);
659 int err;
660
661 dev_dbg(icd->pdev, "mmap called, vma=0x%08lx\n", (unsigned long)vma);
662
663 if (icd->streamer != file)
664 return -EBUSY;
665
666 if (mutex_lock_interruptible(&icd->video_lock))
667 return -ERESTARTSYS;
668 if (ici->ops->init_videobuf)
669 err = videobuf_mmap_mapper(&icd->vb_vidq, vma);
670 else
671 err = vb2_mmap(&icd->vb2_vidq, vma);
672 mutex_unlock(&icd->video_lock);
673
674 dev_dbg(icd->pdev, "vma start=0x%08lx, size=%ld, ret=%d\n",
675 (unsigned long)vma->vm_start,
676 (unsigned long)vma->vm_end - (unsigned long)vma->vm_start,
677 err);
678
679 return err;
680 }
681
682 static unsigned int soc_camera_poll(struct file *file, poll_table *pt)
683 {
684 struct soc_camera_device *icd = file->private_data;
685 struct soc_camera_host *ici = to_soc_camera_host(icd->parent);
686 unsigned res = POLLERR;
687
688 if (icd->streamer != file)
689 return POLLERR;
690
691 mutex_lock(&icd->video_lock);
692 if (ici->ops->init_videobuf && list_empty(&icd->vb_vidq.stream))
693 dev_err(icd->pdev, "Trying to poll with no queued buffers!\n");
694 else
695 res = ici->ops->poll(file, pt);
696 mutex_unlock(&icd->video_lock);
697 return res;
698 }
699
700 void soc_camera_lock(struct vb2_queue *vq)
701 {
702 struct soc_camera_device *icd = vb2_get_drv_priv(vq);
703 mutex_lock(&icd->video_lock);
704 }
705 EXPORT_SYMBOL(soc_camera_lock);
706
707 void soc_camera_unlock(struct vb2_queue *vq)
708 {
709 struct soc_camera_device *icd = vb2_get_drv_priv(vq);
710 mutex_unlock(&icd->video_lock);
711 }
712 EXPORT_SYMBOL(soc_camera_unlock);
713
714 static struct v4l2_file_operations soc_camera_fops = {
715 .owner = THIS_MODULE,
716 .open = soc_camera_open,
717 .release = soc_camera_close,
718 .unlocked_ioctl = video_ioctl2,
719 .read = soc_camera_read,
720 .mmap = soc_camera_mmap,
721 .poll = soc_camera_poll,
722 };
723
724 static int soc_camera_s_fmt_vid_cap(struct file *file, void *priv,
725 struct v4l2_format *f)
726 {
727 struct soc_camera_device *icd = file->private_data;
728 int ret;
729
730 WARN_ON(priv != file->private_data);
731
732 if (f->type != V4L2_BUF_TYPE_VIDEO_CAPTURE) {
733 dev_warn(icd->pdev, "Wrong buf-type %d\n", f->type);
734 return -EINVAL;
735 }
736
737 if (icd->streamer && icd->streamer != file)
738 return -EBUSY;
739
740 if (is_streaming(to_soc_camera_host(icd->parent), icd)) {
741 dev_err(icd->pdev, "S_FMT denied: queue initialised\n");
742 return -EBUSY;
743 }
744
745 ret = soc_camera_set_fmt(icd, f);
746
747 if (!ret && !icd->streamer)
748 icd->streamer = file;
749
750 return ret;
751 }
752
753 static int soc_camera_enum_fmt_vid_cap(struct file *file, void *priv,
754 struct v4l2_fmtdesc *f)
755 {
756 struct soc_camera_device *icd = file->private_data;
757 const struct soc_mbus_pixelfmt *format;
758
759 WARN_ON(priv != file->private_data);
760
761 if (f->index >= icd->num_user_formats)
762 return -EINVAL;
763
764 format = icd->user_formats[f->index].host_fmt;
765
766 if (format->name)
767 strlcpy(f->description, format->name, sizeof(f->description));
768 f->pixelformat = format->fourcc;
769 return 0;
770 }
771
772 static int soc_camera_g_fmt_vid_cap(struct file *file, void *priv,
773 struct v4l2_format *f)
774 {
775 struct soc_camera_device *icd = file->private_data;
776 struct v4l2_pix_format *pix = &f->fmt.pix;
777
778 WARN_ON(priv != file->private_data);
779
780 if (f->type != V4L2_BUF_TYPE_VIDEO_CAPTURE)
781 return -EINVAL;
782
783 pix->width = icd->user_width;
784 pix->height = icd->user_height;
785 pix->bytesperline = icd->bytesperline;
786 pix->sizeimage = icd->sizeimage;
787 pix->field = icd->field;
788 pix->pixelformat = icd->current_fmt->host_fmt->fourcc;
789 pix->colorspace = icd->colorspace;
790 dev_dbg(icd->pdev, "current_fmt->fourcc: 0x%08x\n",
791 icd->current_fmt->host_fmt->fourcc);
792 return 0;
793 }
794
795 static int soc_camera_querycap(struct file *file, void *priv,
796 struct v4l2_capability *cap)
797 {
798 struct soc_camera_device *icd = file->private_data;
799 struct soc_camera_host *ici = to_soc_camera_host(icd->parent);
800
801 WARN_ON(priv != file->private_data);
802
803 strlcpy(cap->driver, ici->drv_name, sizeof(cap->driver));
804 return ici->ops->querycap(ici, cap);
805 }
806
807 static int soc_camera_streamon(struct file *file, void *priv,
808 enum v4l2_buf_type i)
809 {
810 struct soc_camera_device *icd = file->private_data;
811 struct soc_camera_host *ici = to_soc_camera_host(icd->parent);
812 struct v4l2_subdev *sd = soc_camera_to_subdev(icd);
813 int ret;
814
815 WARN_ON(priv != file->private_data);
816
817 if (i != V4L2_BUF_TYPE_VIDEO_CAPTURE)
818 return -EINVAL;
819
820 if (icd->streamer != file)
821 return -EBUSY;
822
823 /* This calls buf_queue from host driver's videobuf_queue_ops */
824 if (ici->ops->init_videobuf)
825 ret = videobuf_streamon(&icd->vb_vidq);
826 else
827 ret = vb2_streamon(&icd->vb2_vidq, i);
828
829 if (!ret)
830 v4l2_subdev_call(sd, video, s_stream, 1);
831
832 return ret;
833 }
834
835 static int soc_camera_streamoff(struct file *file, void *priv,
836 enum v4l2_buf_type i)
837 {
838 struct soc_camera_device *icd = file->private_data;
839 struct v4l2_subdev *sd = soc_camera_to_subdev(icd);
840 struct soc_camera_host *ici = to_soc_camera_host(icd->parent);
841
842 WARN_ON(priv != file->private_data);
843
844 if (i != V4L2_BUF_TYPE_VIDEO_CAPTURE)
845 return -EINVAL;
846
847 if (icd->streamer != file)
848 return -EBUSY;
849
850 /*
851 * This calls buf_release from host driver's videobuf_queue_ops for all
852 * remaining buffers. When the last buffer is freed, stop capture
853 */
854 if (ici->ops->init_videobuf)
855 videobuf_streamoff(&icd->vb_vidq);
856 else
857 vb2_streamoff(&icd->vb2_vidq, i);
858
859 v4l2_subdev_call(sd, video, s_stream, 0);
860
861 return 0;
862 }
863
864 static int soc_camera_cropcap(struct file *file, void *fh,
865 struct v4l2_cropcap *a)
866 {
867 struct soc_camera_device *icd = file->private_data;
868 struct soc_camera_host *ici = to_soc_camera_host(icd->parent);
869
870 return ici->ops->cropcap(icd, a);
871 }
872
873 static int soc_camera_g_crop(struct file *file, void *fh,
874 struct v4l2_crop *a)
875 {
876 struct soc_camera_device *icd = file->private_data;
877 struct soc_camera_host *ici = to_soc_camera_host(icd->parent);
878 int ret;
879
880 ret = ici->ops->get_crop(icd, a);
881
882 return ret;
883 }
884
885 /*
886 * According to the V4L2 API, drivers shall not update the struct v4l2_crop
887 * argument with the actual geometry, instead, the user shall use G_CROP to
888 * retrieve it.
889 */
890 static int soc_camera_s_crop(struct file *file, void *fh,
891 const struct v4l2_crop *a)
892 {
893 struct soc_camera_device *icd = file->private_data;
894 struct soc_camera_host *ici = to_soc_camera_host(icd->parent);
895 const struct v4l2_rect *rect = &a->c;
896 struct v4l2_crop current_crop;
897 int ret;
898
899 if (a->type != V4L2_BUF_TYPE_VIDEO_CAPTURE)
900 return -EINVAL;
901
902 dev_dbg(icd->pdev, "S_CROP(%ux%u@%u:%u)\n",
903 rect->width, rect->height, rect->left, rect->top);
904
905 /* If get_crop fails, we'll let host and / or client drivers decide */
906 ret = ici->ops->get_crop(icd, &current_crop);
907
908 /* Prohibit window size change with initialised buffers */
909 if (ret < 0) {
910 dev_err(icd->pdev,
911 "S_CROP denied: getting current crop failed\n");
912 } else if ((a->c.width == current_crop.c.width &&
913 a->c.height == current_crop.c.height) ||
914 !is_streaming(ici, icd)) {
915 /* same size or not streaming - use .set_crop() */
916 ret = ici->ops->set_crop(icd, a);
917 } else if (ici->ops->set_livecrop) {
918 ret = ici->ops->set_livecrop(icd, a);
919 } else {
920 dev_err(icd->pdev,
921 "S_CROP denied: queue initialised and sizes differ\n");
922 ret = -EBUSY;
923 }
924
925 return ret;
926 }
927
928 static int soc_camera_g_selection(struct file *file, void *fh,
929 struct v4l2_selection *s)
930 {
931 struct soc_camera_device *icd = file->private_data;
932 struct soc_camera_host *ici = to_soc_camera_host(icd->parent);
933
934 /* With a wrong type no need to try to fall back to cropping */
935 if (s->type != V4L2_BUF_TYPE_VIDEO_CAPTURE)
936 return -EINVAL;
937
938 if (!ici->ops->get_selection)
939 return -ENOTTY;
940
941 return ici->ops->get_selection(icd, s);
942 }
943
944 static int soc_camera_s_selection(struct file *file, void *fh,
945 struct v4l2_selection *s)
946 {
947 struct soc_camera_device *icd = file->private_data;
948 struct soc_camera_host *ici = to_soc_camera_host(icd->parent);
949 int ret;
950
951 /* In all these cases cropping emulation will not help */
952 if (s->type != V4L2_BUF_TYPE_VIDEO_CAPTURE ||
953 (s->target != V4L2_SEL_TGT_COMPOSE_ACTIVE &&
954 s->target != V4L2_SEL_TGT_CROP_ACTIVE))
955 return -EINVAL;
956
957 if (s->target == V4L2_SEL_TGT_COMPOSE_ACTIVE) {
958 /* No output size change during a running capture! */
959 if (is_streaming(ici, icd) &&
960 (icd->user_width != s->r.width ||
961 icd->user_height != s->r.height))
962 return -EBUSY;
963
964 /*
965 * Only one user is allowed to change the output format, touch
966 * buffers, start / stop streaming, poll for data
967 */
968 if (icd->streamer && icd->streamer != file)
969 return -EBUSY;
970 }
971
972 if (!ici->ops->set_selection)
973 return -ENOTTY;
974
975 ret = ici->ops->set_selection(icd, s);
976 if (!ret &&
977 s->target == V4L2_SEL_TGT_COMPOSE_ACTIVE) {
978 icd->user_width = s->r.width;
979 icd->user_height = s->r.height;
980 if (!icd->streamer)
981 icd->streamer = file;
982 }
983
984 return ret;
985 }
986
987 static int soc_camera_g_parm(struct file *file, void *fh,
988 struct v4l2_streamparm *a)
989 {
990 struct soc_camera_device *icd = file->private_data;
991 struct soc_camera_host *ici = to_soc_camera_host(icd->parent);
992
993 if (ici->ops->get_parm)
994 return ici->ops->get_parm(icd, a);
995
996 return -ENOIOCTLCMD;
997 }
998
999 static int soc_camera_s_parm(struct file *file, void *fh,
1000 struct v4l2_streamparm *a)
1001 {
1002 struct soc_camera_device *icd = file->private_data;
1003 struct soc_camera_host *ici = to_soc_camera_host(icd->parent);
1004
1005 if (ici->ops->set_parm)
1006 return ici->ops->set_parm(icd, a);
1007
1008 return -ENOIOCTLCMD;
1009 }
1010
1011 static int soc_camera_g_chip_ident(struct file *file, void *fh,
1012 struct v4l2_dbg_chip_ident *id)
1013 {
1014 struct soc_camera_device *icd = file->private_data;
1015 struct v4l2_subdev *sd = soc_camera_to_subdev(icd);
1016
1017 return v4l2_subdev_call(sd, core, g_chip_ident, id);
1018 }
1019
1020 #ifdef CONFIG_VIDEO_ADV_DEBUG
1021 static int soc_camera_g_register(struct file *file, void *fh,
1022 struct v4l2_dbg_register *reg)
1023 {
1024 struct soc_camera_device *icd = file->private_data;
1025 struct v4l2_subdev *sd = soc_camera_to_subdev(icd);
1026
1027 return v4l2_subdev_call(sd, core, g_register, reg);
1028 }
1029
1030 static int soc_camera_s_register(struct file *file, void *fh,
1031 struct v4l2_dbg_register *reg)
1032 {
1033 struct soc_camera_device *icd = file->private_data;
1034 struct v4l2_subdev *sd = soc_camera_to_subdev(icd);
1035
1036 return v4l2_subdev_call(sd, core, s_register, reg);
1037 }
1038 #endif
1039
1040 static int soc_camera_probe(struct soc_camera_device *icd);
1041
1042 /* So far this function cannot fail */
1043 static void scan_add_host(struct soc_camera_host *ici)
1044 {
1045 struct soc_camera_device *icd;
1046
1047 mutex_lock(&ici->host_lock);
1048
1049 list_for_each_entry(icd, &devices, list) {
1050 if (icd->iface == ici->nr) {
1051 int ret;
1052
1053 icd->parent = ici->v4l2_dev.dev;
1054 ret = soc_camera_probe(icd);
1055 }
1056 }
1057
1058 mutex_unlock(&ici->host_lock);
1059 }
1060
1061 #ifdef CONFIG_I2C_BOARDINFO
1062 static int soc_camera_init_i2c(struct soc_camera_device *icd,
1063 struct soc_camera_link *icl)
1064 {
1065 struct i2c_client *client;
1066 struct soc_camera_host *ici = to_soc_camera_host(icd->parent);
1067 struct i2c_adapter *adap = i2c_get_adapter(icl->i2c_adapter_id);
1068 struct v4l2_subdev *subdev;
1069
1070 if (!adap) {
1071 dev_err(icd->pdev, "Cannot get I2C adapter #%d. No driver?\n",
1072 icl->i2c_adapter_id);
1073 goto ei2cga;
1074 }
1075
1076 icl->board_info->platform_data = icl;
1077
1078 subdev = v4l2_i2c_new_subdev_board(&ici->v4l2_dev, adap,
1079 icl->board_info, NULL);
1080 if (!subdev)
1081 goto ei2cnd;
1082
1083 client = v4l2_get_subdevdata(subdev);
1084
1085 /* Use to_i2c_client(dev) to recover the i2c client */
1086 icd->control = &client->dev;
1087
1088 return 0;
1089 ei2cnd:
1090 i2c_put_adapter(adap);
1091 ei2cga:
1092 return -ENODEV;
1093 }
1094
1095 static void soc_camera_free_i2c(struct soc_camera_device *icd)
1096 {
1097 struct i2c_client *client =
1098 to_i2c_client(to_soc_camera_control(icd));
1099 struct i2c_adapter *adap = client->adapter;
1100
1101 icd->control = NULL;
1102 v4l2_device_unregister_subdev(i2c_get_clientdata(client));
1103 i2c_unregister_device(client);
1104 i2c_put_adapter(adap);
1105 }
1106 #else
1107 #define soc_camera_init_i2c(icd, icl) (-ENODEV)
1108 #define soc_camera_free_i2c(icd) do {} while (0)
1109 #endif
1110
1111 static int soc_camera_video_start(struct soc_camera_device *icd);
1112 static int video_dev_create(struct soc_camera_device *icd);
1113 /* Called during host-driver probe */
1114 static int soc_camera_probe(struct soc_camera_device *icd)
1115 {
1116 struct soc_camera_host *ici = to_soc_camera_host(icd->parent);
1117 struct soc_camera_link *icl = to_soc_camera_link(icd);
1118 struct device *control = NULL;
1119 struct v4l2_subdev *sd;
1120 struct v4l2_mbus_framefmt mf;
1121 int ret;
1122
1123 dev_info(icd->pdev, "Probing %s\n", dev_name(icd->pdev));
1124
1125 /*
1126 * Currently the subdev with the largest number of controls (13) is
1127 * ov6550. So let's pick 16 as a hint for the control handler. Note
1128 * that this is a hint only: too large and you waste some memory, too
1129 * small and there is a (very) small performance hit when looking up
1130 * controls in the internal hash.
1131 */
1132 ret = v4l2_ctrl_handler_init(&icd->ctrl_handler, 16);
1133 if (ret < 0)
1134 return ret;
1135
1136 ret = regulator_bulk_get(icd->pdev, icl->num_regulators,
1137 icl->regulators);
1138 if (ret < 0)
1139 goto ereg;
1140
1141 /* The camera could have been already on, try to reset */
1142 if (icl->reset)
1143 icl->reset(icd->pdev);
1144
1145 ret = ici->ops->add(icd);
1146 if (ret < 0)
1147 goto eadd;
1148
1149 /* Must have icd->vdev before registering the device */
1150 ret = video_dev_create(icd);
1151 if (ret < 0)
1152 goto evdc;
1153
1154 /* Non-i2c cameras, e.g., soc_camera_platform, have no board_info */
1155 if (icl->board_info) {
1156 ret = soc_camera_init_i2c(icd, icl);
1157 if (ret < 0)
1158 goto eadddev;
1159 } else if (!icl->add_device || !icl->del_device) {
1160 ret = -EINVAL;
1161 goto eadddev;
1162 } else {
1163 if (icl->module_name)
1164 ret = request_module(icl->module_name);
1165
1166 ret = icl->add_device(icd);
1167 if (ret < 0)
1168 goto eadddev;
1169
1170 /*
1171 * FIXME: this is racy, have to use driver-binding notification,
1172 * when it is available
1173 */
1174 control = to_soc_camera_control(icd);
1175 if (!control || !control->driver || !dev_get_drvdata(control) ||
1176 !try_module_get(control->driver->owner)) {
1177 icl->del_device(icd);
1178 ret = -ENODEV;
1179 goto enodrv;
1180 }
1181 }
1182
1183 sd = soc_camera_to_subdev(icd);
1184 sd->grp_id = soc_camera_grp_id(icd);
1185 v4l2_set_subdev_hostdata(sd, icd);
1186
1187 if (v4l2_ctrl_add_handler(&icd->ctrl_handler, sd->ctrl_handler, NULL))
1188 goto ectrl;
1189
1190 /* At this point client .probe() should have run already */
1191 ret = soc_camera_init_user_formats(icd);
1192 if (ret < 0)
1193 goto eiufmt;
1194
1195 icd->field = V4L2_FIELD_ANY;
1196
1197 /*
1198 * ..._video_start() will create a device node, video_register_device()
1199 * itself is protected against concurrent open() calls, but we also have
1200 * to protect our data.
1201 */
1202 mutex_lock(&icd->video_lock);
1203
1204 ret = soc_camera_video_start(icd);
1205 if (ret < 0)
1206 goto evidstart;
1207
1208 /* Try to improve our guess of a reasonable window format */
1209 if (!v4l2_subdev_call(sd, video, g_mbus_fmt, &mf)) {
1210 icd->user_width = mf.width;
1211 icd->user_height = mf.height;
1212 icd->colorspace = mf.colorspace;
1213 icd->field = mf.field;
1214 }
1215
1216 ici->ops->remove(icd);
1217
1218 mutex_unlock(&icd->video_lock);
1219
1220 return 0;
1221
1222 evidstart:
1223 mutex_unlock(&icd->video_lock);
1224 soc_camera_free_user_formats(icd);
1225 eiufmt:
1226 ectrl:
1227 if (icl->board_info) {
1228 soc_camera_free_i2c(icd);
1229 } else {
1230 icl->del_device(icd);
1231 module_put(control->driver->owner);
1232 }
1233 enodrv:
1234 eadddev:
1235 video_device_release(icd->vdev);
1236 icd->vdev = NULL;
1237 evdc:
1238 ici->ops->remove(icd);
1239 eadd:
1240 regulator_bulk_free(icl->num_regulators, icl->regulators);
1241 ereg:
1242 v4l2_ctrl_handler_free(&icd->ctrl_handler);
1243 return ret;
1244 }
1245
1246 /*
1247 * This is called on device_unregister, which only means we have to disconnect
1248 * from the host, but not remove ourselves from the device list
1249 */
1250 static int soc_camera_remove(struct soc_camera_device *icd)
1251 {
1252 struct soc_camera_link *icl = to_soc_camera_link(icd);
1253 struct video_device *vdev = icd->vdev;
1254
1255 BUG_ON(!icd->parent);
1256
1257 v4l2_ctrl_handler_free(&icd->ctrl_handler);
1258 if (vdev) {
1259 video_unregister_device(vdev);
1260 icd->vdev = NULL;
1261 }
1262
1263 if (icl->board_info) {
1264 soc_camera_free_i2c(icd);
1265 } else {
1266 struct device_driver *drv = to_soc_camera_control(icd)->driver;
1267 if (drv) {
1268 icl->del_device(icd);
1269 module_put(drv->owner);
1270 }
1271 }
1272 soc_camera_free_user_formats(icd);
1273
1274 regulator_bulk_free(icl->num_regulators, icl->regulators);
1275
1276 return 0;
1277 }
1278
1279 static int default_cropcap(struct soc_camera_device *icd,
1280 struct v4l2_cropcap *a)
1281 {
1282 struct v4l2_subdev *sd = soc_camera_to_subdev(icd);
1283 return v4l2_subdev_call(sd, video, cropcap, a);
1284 }
1285
1286 static int default_g_crop(struct soc_camera_device *icd, struct v4l2_crop *a)
1287 {
1288 struct v4l2_subdev *sd = soc_camera_to_subdev(icd);
1289 return v4l2_subdev_call(sd, video, g_crop, a);
1290 }
1291
1292 static int default_s_crop(struct soc_camera_device *icd, const struct v4l2_crop *a)
1293 {
1294 struct v4l2_subdev *sd = soc_camera_to_subdev(icd);
1295 return v4l2_subdev_call(sd, video, s_crop, a);
1296 }
1297
1298 static int default_g_parm(struct soc_camera_device *icd,
1299 struct v4l2_streamparm *parm)
1300 {
1301 struct v4l2_subdev *sd = soc_camera_to_subdev(icd);
1302 return v4l2_subdev_call(sd, video, g_parm, parm);
1303 }
1304
1305 static int default_s_parm(struct soc_camera_device *icd,
1306 struct v4l2_streamparm *parm)
1307 {
1308 struct v4l2_subdev *sd = soc_camera_to_subdev(icd);
1309 return v4l2_subdev_call(sd, video, s_parm, parm);
1310 }
1311
1312 static int default_enum_framesizes(struct soc_camera_device *icd,
1313 struct v4l2_frmsizeenum *fsize)
1314 {
1315 int ret;
1316 struct v4l2_subdev *sd = soc_camera_to_subdev(icd);
1317 const struct soc_camera_format_xlate *xlate;
1318 __u32 pixfmt = fsize->pixel_format;
1319 struct v4l2_frmsizeenum fsize_mbus = *fsize;
1320
1321 xlate = soc_camera_xlate_by_fourcc(icd, pixfmt);
1322 if (!xlate)
1323 return -EINVAL;
1324 /* map xlate-code to pixel_format, sensor only handle xlate-code*/
1325 fsize_mbus.pixel_format = xlate->code;
1326
1327 ret = v4l2_subdev_call(sd, video, enum_framesizes, &fsize_mbus);
1328 if (ret < 0)
1329 return ret;
1330
1331 *fsize = fsize_mbus;
1332 fsize->pixel_format = pixfmt;
1333
1334 return 0;
1335 }
1336
1337 int soc_camera_host_register(struct soc_camera_host *ici)
1338 {
1339 struct soc_camera_host *ix;
1340 int ret;
1341
1342 if (!ici || !ici->ops ||
1343 !ici->ops->try_fmt ||
1344 !ici->ops->set_fmt ||
1345 !ici->ops->set_bus_param ||
1346 !ici->ops->querycap ||
1347 ((!ici->ops->init_videobuf ||
1348 !ici->ops->reqbufs) &&
1349 !ici->ops->init_videobuf2) ||
1350 !ici->ops->add ||
1351 !ici->ops->remove ||
1352 !ici->ops->poll ||
1353 !ici->v4l2_dev.dev)
1354 return -EINVAL;
1355
1356 if (!ici->ops->set_crop)
1357 ici->ops->set_crop = default_s_crop;
1358 if (!ici->ops->get_crop)
1359 ici->ops->get_crop = default_g_crop;
1360 if (!ici->ops->cropcap)
1361 ici->ops->cropcap = default_cropcap;
1362 if (!ici->ops->set_parm)
1363 ici->ops->set_parm = default_s_parm;
1364 if (!ici->ops->get_parm)
1365 ici->ops->get_parm = default_g_parm;
1366 if (!ici->ops->enum_framesizes)
1367 ici->ops->enum_framesizes = default_enum_framesizes;
1368
1369 mutex_lock(&list_lock);
1370 list_for_each_entry(ix, &hosts, list) {
1371 if (ix->nr == ici->nr) {
1372 ret = -EBUSY;
1373 goto edevreg;
1374 }
1375 }
1376
1377 ret = v4l2_device_register(ici->v4l2_dev.dev, &ici->v4l2_dev);
1378 if (ret < 0)
1379 goto edevreg;
1380
1381 list_add_tail(&ici->list, &hosts);
1382 mutex_unlock(&list_lock);
1383
1384 mutex_init(&ici->host_lock);
1385 scan_add_host(ici);
1386
1387 return 0;
1388
1389 edevreg:
1390 mutex_unlock(&list_lock);
1391 return ret;
1392 }
1393 EXPORT_SYMBOL(soc_camera_host_register);
1394
1395 /* Unregister all clients! */
1396 void soc_camera_host_unregister(struct soc_camera_host *ici)
1397 {
1398 struct soc_camera_device *icd;
1399
1400 mutex_lock(&list_lock);
1401
1402 list_del(&ici->list);
1403 list_for_each_entry(icd, &devices, list)
1404 if (icd->iface == ici->nr && to_soc_camera_control(icd))
1405 soc_camera_remove(icd);
1406
1407 mutex_unlock(&list_lock);
1408
1409 v4l2_device_unregister(&ici->v4l2_dev);
1410 }
1411 EXPORT_SYMBOL(soc_camera_host_unregister);
1412
1413 /* Image capture device */
1414 static int soc_camera_device_register(struct soc_camera_device *icd)
1415 {
1416 struct soc_camera_device *ix;
1417 int num = -1, i;
1418
1419 for (i = 0; i < 256 && num < 0; i++) {
1420 num = i;
1421 /* Check if this index is available on this interface */
1422 list_for_each_entry(ix, &devices, list) {
1423 if (ix->iface == icd->iface && ix->devnum == i) {
1424 num = -1;
1425 break;
1426 }
1427 }
1428 }
1429
1430 if (num < 0)
1431 /*
1432 * ok, we have 256 cameras on this host...
1433 * man, stay reasonable...
1434 */
1435 return -ENOMEM;
1436
1437 icd->devnum = num;
1438 icd->use_count = 0;
1439 icd->host_priv = NULL;
1440 mutex_init(&icd->video_lock);
1441
1442 list_add_tail(&icd->list, &devices);
1443
1444 return 0;
1445 }
1446
1447 static const struct v4l2_ioctl_ops soc_camera_ioctl_ops = {
1448 .vidioc_querycap = soc_camera_querycap,
1449 .vidioc_try_fmt_vid_cap = soc_camera_try_fmt_vid_cap,
1450 .vidioc_g_fmt_vid_cap = soc_camera_g_fmt_vid_cap,
1451 .vidioc_s_fmt_vid_cap = soc_camera_s_fmt_vid_cap,
1452 .vidioc_enum_fmt_vid_cap = soc_camera_enum_fmt_vid_cap,
1453 .vidioc_enum_input = soc_camera_enum_input,
1454 .vidioc_g_input = soc_camera_g_input,
1455 .vidioc_s_input = soc_camera_s_input,
1456 .vidioc_s_std = soc_camera_s_std,
1457 .vidioc_g_std = soc_camera_g_std,
1458 .vidioc_enum_framesizes = soc_camera_enum_framesizes,
1459 .vidioc_reqbufs = soc_camera_reqbufs,
1460 .vidioc_querybuf = soc_camera_querybuf,
1461 .vidioc_qbuf = soc_camera_qbuf,
1462 .vidioc_dqbuf = soc_camera_dqbuf,
1463 .vidioc_create_bufs = soc_camera_create_bufs,
1464 .vidioc_prepare_buf = soc_camera_prepare_buf,
1465 .vidioc_streamon = soc_camera_streamon,
1466 .vidioc_streamoff = soc_camera_streamoff,
1467 .vidioc_cropcap = soc_camera_cropcap,
1468 .vidioc_g_crop = soc_camera_g_crop,
1469 .vidioc_s_crop = soc_camera_s_crop,
1470 .vidioc_g_selection = soc_camera_g_selection,
1471 .vidioc_s_selection = soc_camera_s_selection,
1472 .vidioc_g_parm = soc_camera_g_parm,
1473 .vidioc_s_parm = soc_camera_s_parm,
1474 .vidioc_g_chip_ident = soc_camera_g_chip_ident,
1475 #ifdef CONFIG_VIDEO_ADV_DEBUG
1476 .vidioc_g_register = soc_camera_g_register,
1477 .vidioc_s_register = soc_camera_s_register,
1478 #endif
1479 };
1480
1481 static int video_dev_create(struct soc_camera_device *icd)
1482 {
1483 struct soc_camera_host *ici = to_soc_camera_host(icd->parent);
1484 struct video_device *vdev = video_device_alloc();
1485
1486 if (!vdev)
1487 return -ENOMEM;
1488
1489 strlcpy(vdev->name, ici->drv_name, sizeof(vdev->name));
1490
1491 vdev->parent = icd->pdev;
1492 vdev->current_norm = V4L2_STD_UNKNOWN;
1493 vdev->fops = &soc_camera_fops;
1494 vdev->ioctl_ops = &soc_camera_ioctl_ops;
1495 vdev->release = video_device_release;
1496 vdev->tvnorms = V4L2_STD_UNKNOWN;
1497 vdev->ctrl_handler = &icd->ctrl_handler;
1498 vdev->lock = &icd->video_lock;
1499
1500 icd->vdev = vdev;
1501
1502 return 0;
1503 }
1504
1505 /*
1506 * Called from soc_camera_probe() above (with .video_lock held???)
1507 */
1508 static int soc_camera_video_start(struct soc_camera_device *icd)
1509 {
1510 const struct device_type *type = icd->vdev->dev.type;
1511 int ret;
1512
1513 if (!icd->parent)
1514 return -ENODEV;
1515
1516 ret = video_register_device(icd->vdev, VFL_TYPE_GRABBER, -1);
1517 if (ret < 0) {
1518 dev_err(icd->pdev, "video_register_device failed: %d\n", ret);
1519 return ret;
1520 }
1521
1522 /* Restore device type, possibly set by the subdevice driver */
1523 icd->vdev->dev.type = type;
1524
1525 return 0;
1526 }
1527
1528 static int __devinit soc_camera_pdrv_probe(struct platform_device *pdev)
1529 {
1530 struct soc_camera_link *icl = pdev->dev.platform_data;
1531 struct soc_camera_device *icd;
1532 int ret;
1533
1534 if (!icl)
1535 return -EINVAL;
1536
1537 icd = kzalloc(sizeof(*icd), GFP_KERNEL);
1538 if (!icd)
1539 return -ENOMEM;
1540
1541 icd->iface = icl->bus_id;
1542 icd->link = icl;
1543 icd->pdev = &pdev->dev;
1544 platform_set_drvdata(pdev, icd);
1545
1546 ret = soc_camera_device_register(icd);
1547 if (ret < 0)
1548 goto escdevreg;
1549
1550 icd->user_width = DEFAULT_WIDTH;
1551 icd->user_height = DEFAULT_HEIGHT;
1552
1553 return 0;
1554
1555 escdevreg:
1556 kfree(icd);
1557
1558 return ret;
1559 }
1560
1561 /*
1562 * Only called on rmmod for each platform device, since they are not
1563 * hot-pluggable. Now we know, that all our users - hosts and devices have
1564 * been unloaded already
1565 */
1566 static int __devexit soc_camera_pdrv_remove(struct platform_device *pdev)
1567 {
1568 struct soc_camera_device *icd = platform_get_drvdata(pdev);
1569
1570 if (!icd)
1571 return -EINVAL;
1572
1573 list_del(&icd->list);
1574
1575 kfree(icd);
1576
1577 return 0;
1578 }
1579
1580 static struct platform_driver __refdata soc_camera_pdrv = {
1581 .probe = soc_camera_pdrv_probe,
1582 .remove = __devexit_p(soc_camera_pdrv_remove),
1583 .driver = {
1584 .name = "soc-camera-pdrv",
1585 .owner = THIS_MODULE,
1586 },
1587 };
1588
1589 static int __init soc_camera_init(void)
1590 {
1591 return platform_driver_register(&soc_camera_pdrv);
1592 }
1593
1594 static void __exit soc_camera_exit(void)
1595 {
1596 platform_driver_unregister(&soc_camera_pdrv);
1597 }
1598
1599 module_init(soc_camera_init);
1600 module_exit(soc_camera_exit);
1601
1602 MODULE_DESCRIPTION("Image capture bus driver");
1603 MODULE_AUTHOR("Guennadi Liakhovetski <kernel@pengutronix.de>");
1604 MODULE_LICENSE("GPL");
1605 MODULE_ALIAS("platform:soc-camera-pdrv");
kernel source for telekom puls (alcatel/mediatek)