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Merge tag 'common-clk-api' of git://git.kernel.org/pub/scm/linux/kernel/git/arm/arm-soc
[deliverable/linux.git] / drivers / media / video / soc_camera.c
1 /*
2 * camera image capture (abstract) bus driver
3 *
4 * Copyright (C) 2008, Guennadi Liakhovetski <kernel@pengutronix.de>
5 *
6 * This driver provides an interface between platform-specific camera
7 * busses and camera devices. It should be used if the camera is
8 * connected not over a "proper" bus like PCI or USB, but over a
9 * special bus, like, for example, the Quick Capture interface on PXA270
10 * SoCs. Later it should also be used for i.MX31 SoCs from Freescale.
11 * It can handle multiple cameras and / or multiple busses, which can
12 * be used, e.g., in stereo-vision applications.
13 *
14 * This program is free software; you can redistribute it and/or modify
15 * it under the terms of the GNU General Public License version 2 as
16 * published by the Free Software Foundation.
17 */
18
19 #include <linux/device.h>
20 #include <linux/err.h>
21 #include <linux/i2c.h>
22 #include <linux/init.h>
23 #include <linux/list.h>
24 #include <linux/mutex.h>
25 #include <linux/module.h>
26 #include <linux/platform_device.h>
27 #include <linux/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_on(struct soc_camera_device *icd,
54 struct soc_camera_link *icl)
55 {
56 struct v4l2_subdev *sd = soc_camera_to_subdev(icd);
57 int ret = regulator_bulk_enable(icl->num_regulators,
58 icl->regulators);
59 if (ret < 0) {
60 dev_err(icd->pdev, "Cannot enable regulators\n");
61 return ret;
62 }
63
64 if (icl->power) {
65 ret = icl->power(icd->pdev, 1);
66 if (ret < 0) {
67 dev_err(icd->pdev,
68 "Platform failed to power-on the camera.\n");
69 goto elinkpwr;
70 }
71 }
72
73 ret = v4l2_subdev_call(sd, core, s_power, 1);
74 if (ret < 0 && ret != -ENOIOCTLCMD && ret != -ENODEV)
75 goto esdpwr;
76
77 return 0;
78
79 esdpwr:
80 if (icl->power)
81 icl->power(icd->pdev, 0);
82 elinkpwr:
83 regulator_bulk_disable(icl->num_regulators,
84 icl->regulators);
85 return ret;
86 }
87
88 static int soc_camera_power_off(struct soc_camera_device *icd,
89 struct soc_camera_link *icl)
90 {
91 struct v4l2_subdev *sd = soc_camera_to_subdev(icd);
92 int ret = v4l2_subdev_call(sd, core, s_power, 0);
93
94 if (ret < 0 && ret != -ENOIOCTLCMD && ret != -ENODEV)
95 return ret;
96
97 if (icl->power) {
98 ret = icl->power(icd->pdev, 0);
99 if (ret < 0) {
100 dev_err(icd->pdev,
101 "Platform failed to power-off the camera.\n");
102 return ret;
103 }
104 }
105
106 ret = regulator_bulk_disable(icl->num_regulators,
107 icl->regulators);
108 if (ret < 0)
109 dev_err(icd->pdev, "Cannot disable regulators\n");
110
111 return ret;
112 }
113
114 const struct soc_camera_format_xlate *soc_camera_xlate_by_fourcc(
115 struct soc_camera_device *icd, unsigned int fourcc)
116 {
117 unsigned int i;
118
119 for (i = 0; i < icd->num_user_formats; i++)
120 if (icd->user_formats[i].host_fmt->fourcc == fourcc)
121 return icd->user_formats + i;
122 return NULL;
123 }
124 EXPORT_SYMBOL(soc_camera_xlate_by_fourcc);
125
126 /**
127 * soc_camera_apply_board_flags() - apply platform SOCAM_SENSOR_INVERT_* flags
128 * @icl: camera platform parameters
129 * @cfg: media bus configuration
130 * @return: resulting flags
131 */
132 unsigned long soc_camera_apply_board_flags(struct soc_camera_link *icl,
133 const struct v4l2_mbus_config *cfg)
134 {
135 unsigned long f, flags = cfg->flags;
136
137 /* If only one of the two polarities is supported, switch to the opposite */
138 if (icl->flags & SOCAM_SENSOR_INVERT_HSYNC) {
139 f = flags & (V4L2_MBUS_HSYNC_ACTIVE_HIGH | V4L2_MBUS_HSYNC_ACTIVE_LOW);
140 if (f == V4L2_MBUS_HSYNC_ACTIVE_HIGH || f == V4L2_MBUS_HSYNC_ACTIVE_LOW)
141 flags ^= V4L2_MBUS_HSYNC_ACTIVE_HIGH | V4L2_MBUS_HSYNC_ACTIVE_LOW;
142 }
143
144 if (icl->flags & SOCAM_SENSOR_INVERT_VSYNC) {
145 f = flags & (V4L2_MBUS_VSYNC_ACTIVE_HIGH | V4L2_MBUS_VSYNC_ACTIVE_LOW);
146 if (f == V4L2_MBUS_VSYNC_ACTIVE_HIGH || f == V4L2_MBUS_VSYNC_ACTIVE_LOW)
147 flags ^= V4L2_MBUS_VSYNC_ACTIVE_HIGH | V4L2_MBUS_VSYNC_ACTIVE_LOW;
148 }
149
150 if (icl->flags & SOCAM_SENSOR_INVERT_PCLK) {
151 f = flags & (V4L2_MBUS_PCLK_SAMPLE_RISING | V4L2_MBUS_PCLK_SAMPLE_FALLING);
152 if (f == V4L2_MBUS_PCLK_SAMPLE_RISING || f == V4L2_MBUS_PCLK_SAMPLE_FALLING)
153 flags ^= V4L2_MBUS_PCLK_SAMPLE_RISING | V4L2_MBUS_PCLK_SAMPLE_FALLING;
154 }
155
156 return flags;
157 }
158 EXPORT_SYMBOL(soc_camera_apply_board_flags);
159
160 #define pixfmtstr(x) (x) & 0xff, ((x) >> 8) & 0xff, ((x) >> 16) & 0xff, \
161 ((x) >> 24) & 0xff
162
163 static int soc_camera_try_fmt(struct soc_camera_device *icd,
164 struct v4l2_format *f)
165 {
166 struct soc_camera_host *ici = to_soc_camera_host(icd->parent);
167 struct v4l2_pix_format *pix = &f->fmt.pix;
168 int ret;
169
170 dev_dbg(icd->pdev, "TRY_FMT(%c%c%c%c, %ux%u)\n",
171 pixfmtstr(pix->pixelformat), pix->width, pix->height);
172
173 pix->bytesperline = 0;
174 pix->sizeimage = 0;
175
176 ret = ici->ops->try_fmt(icd, f);
177 if (ret < 0)
178 return ret;
179
180 if (!pix->sizeimage) {
181 if (!pix->bytesperline) {
182 const struct soc_camera_format_xlate *xlate;
183
184 xlate = soc_camera_xlate_by_fourcc(icd, pix->pixelformat);
185 if (!xlate)
186 return -EINVAL;
187
188 ret = soc_mbus_bytes_per_line(pix->width,
189 xlate->host_fmt);
190 if (ret > 0)
191 pix->bytesperline = ret;
192 }
193 if (pix->bytesperline)
194 pix->sizeimage = pix->bytesperline * pix->height;
195 }
196
197 return 0;
198 }
199
200 static int soc_camera_try_fmt_vid_cap(struct file *file, void *priv,
201 struct v4l2_format *f)
202 {
203 struct soc_camera_device *icd = file->private_data;
204
205 WARN_ON(priv != file->private_data);
206
207 /* Only single-plane capture is supported so far */
208 if (f->type != V4L2_BUF_TYPE_VIDEO_CAPTURE)
209 return -EINVAL;
210
211 /* limit format to hardware capabilities */
212 return soc_camera_try_fmt(icd, f);
213 }
214
215 static int soc_camera_enum_input(struct file *file, void *priv,
216 struct v4l2_input *inp)
217 {
218 if (inp->index != 0)
219 return -EINVAL;
220
221 /* default is camera */
222 inp->type = V4L2_INPUT_TYPE_CAMERA;
223 inp->std = V4L2_STD_UNKNOWN;
224 strcpy(inp->name, "Camera");
225
226 return 0;
227 }
228
229 static int soc_camera_g_input(struct file *file, void *priv, unsigned int *i)
230 {
231 *i = 0;
232
233 return 0;
234 }
235
236 static int soc_camera_s_input(struct file *file, void *priv, unsigned int i)
237 {
238 if (i > 0)
239 return -EINVAL;
240
241 return 0;
242 }
243
244 static int soc_camera_s_std(struct file *file, void *priv, v4l2_std_id *a)
245 {
246 struct soc_camera_device *icd = file->private_data;
247 struct v4l2_subdev *sd = soc_camera_to_subdev(icd);
248
249 return v4l2_subdev_call(sd, core, s_std, *a);
250 }
251
252 static int soc_camera_g_std(struct file *file, void *priv, v4l2_std_id *a)
253 {
254 struct soc_camera_device *icd = file->private_data;
255 struct v4l2_subdev *sd = soc_camera_to_subdev(icd);
256
257 return v4l2_subdev_call(sd, core, g_std, a);
258 }
259
260 static int soc_camera_enum_fsizes(struct file *file, void *fh,
261 struct v4l2_frmsizeenum *fsize)
262 {
263 struct soc_camera_device *icd = file->private_data;
264 struct soc_camera_host *ici = to_soc_camera_host(icd->parent);
265
266 return ici->ops->enum_fsizes(icd, fsize);
267 }
268
269 static int soc_camera_reqbufs(struct file *file, void *priv,
270 struct v4l2_requestbuffers *p)
271 {
272 int ret;
273 struct soc_camera_device *icd = file->private_data;
274 struct soc_camera_host *ici = to_soc_camera_host(icd->parent);
275
276 WARN_ON(priv != file->private_data);
277
278 if (icd->streamer && icd->streamer != file)
279 return -EBUSY;
280
281 if (ici->ops->init_videobuf) {
282 ret = videobuf_reqbufs(&icd->vb_vidq, p);
283 if (ret < 0)
284 return ret;
285
286 ret = ici->ops->reqbufs(icd, p);
287 } else {
288 ret = vb2_reqbufs(&icd->vb2_vidq, p);
289 }
290
291 if (!ret && !icd->streamer)
292 icd->streamer = file;
293
294 return ret;
295 }
296
297 static int soc_camera_querybuf(struct file *file, void *priv,
298 struct v4l2_buffer *p)
299 {
300 struct soc_camera_device *icd = file->private_data;
301 struct soc_camera_host *ici = to_soc_camera_host(icd->parent);
302
303 WARN_ON(priv != file->private_data);
304
305 if (ici->ops->init_videobuf)
306 return videobuf_querybuf(&icd->vb_vidq, p);
307 else
308 return vb2_querybuf(&icd->vb2_vidq, p);
309 }
310
311 static int soc_camera_qbuf(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->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_qbuf(&icd->vb_vidq, p);
324 else
325 return vb2_qbuf(&icd->vb2_vidq, p);
326 }
327
328 static int soc_camera_dqbuf(struct file *file, void *priv,
329 struct v4l2_buffer *p)
330 {
331 struct soc_camera_device *icd = file->private_data;
332 struct soc_camera_host *ici = to_soc_camera_host(icd->parent);
333
334 WARN_ON(priv != file->private_data);
335
336 if (icd->streamer != file)
337 return -EBUSY;
338
339 if (ici->ops->init_videobuf)
340 return videobuf_dqbuf(&icd->vb_vidq, p, file->f_flags & O_NONBLOCK);
341 else
342 return vb2_dqbuf(&icd->vb2_vidq, p, file->f_flags & O_NONBLOCK);
343 }
344
345 static int soc_camera_create_bufs(struct file *file, void *priv,
346 struct v4l2_create_buffers *create)
347 {
348 struct soc_camera_device *icd = file->private_data;
349 struct soc_camera_host *ici = to_soc_camera_host(icd->parent);
350
351 /* videobuf2 only */
352 if (ici->ops->init_videobuf)
353 return -EINVAL;
354 else
355 return vb2_create_bufs(&icd->vb2_vidq, create);
356 }
357
358 static int soc_camera_prepare_buf(struct file *file, void *priv,
359 struct v4l2_buffer *b)
360 {
361 struct soc_camera_device *icd = file->private_data;
362 struct soc_camera_host *ici = to_soc_camera_host(icd->parent);
363
364 /* videobuf2 only */
365 if (ici->ops->init_videobuf)
366 return -EINVAL;
367 else
368 return vb2_prepare_buf(&icd->vb2_vidq, b);
369 }
370
371 /* Always entered with .video_lock held */
372 static int soc_camera_init_user_formats(struct soc_camera_device *icd)
373 {
374 struct v4l2_subdev *sd = soc_camera_to_subdev(icd);
375 struct soc_camera_host *ici = to_soc_camera_host(icd->parent);
376 unsigned int i, fmts = 0, raw_fmts = 0;
377 int ret;
378 enum v4l2_mbus_pixelcode code;
379
380 while (!v4l2_subdev_call(sd, video, enum_mbus_fmt, raw_fmts, &code))
381 raw_fmts++;
382
383 if (!ici->ops->get_formats)
384 /*
385 * Fallback mode - the host will have to serve all
386 * sensor-provided formats one-to-one to the user
387 */
388 fmts = raw_fmts;
389 else
390 /*
391 * First pass - only count formats this host-sensor
392 * configuration can provide
393 */
394 for (i = 0; i < raw_fmts; i++) {
395 ret = ici->ops->get_formats(icd, i, NULL);
396 if (ret < 0)
397 return ret;
398 fmts += ret;
399 }
400
401 if (!fmts)
402 return -ENXIO;
403
404 icd->user_formats =
405 vmalloc(fmts * sizeof(struct soc_camera_format_xlate));
406 if (!icd->user_formats)
407 return -ENOMEM;
408
409 dev_dbg(icd->pdev, "Found %d supported formats.\n", fmts);
410
411 /* Second pass - actually fill data formats */
412 fmts = 0;
413 for (i = 0; i < raw_fmts; i++)
414 if (!ici->ops->get_formats) {
415 v4l2_subdev_call(sd, video, enum_mbus_fmt, i, &code);
416 icd->user_formats[fmts].host_fmt =
417 soc_mbus_get_fmtdesc(code);
418 if (icd->user_formats[fmts].host_fmt)
419 icd->user_formats[fmts++].code = code;
420 } else {
421 ret = ici->ops->get_formats(icd, i,
422 &icd->user_formats[fmts]);
423 if (ret < 0)
424 goto egfmt;
425 fmts += ret;
426 }
427
428 icd->num_user_formats = fmts;
429 icd->current_fmt = &icd->user_formats[0];
430
431 return 0;
432
433 egfmt:
434 vfree(icd->user_formats);
435 return ret;
436 }
437
438 /* Always entered with .video_lock held */
439 static void soc_camera_free_user_formats(struct soc_camera_device *icd)
440 {
441 struct soc_camera_host *ici = to_soc_camera_host(icd->parent);
442
443 if (ici->ops->put_formats)
444 ici->ops->put_formats(icd);
445 icd->current_fmt = NULL;
446 icd->num_user_formats = 0;
447 vfree(icd->user_formats);
448 icd->user_formats = NULL;
449 }
450
451 /* Called with .vb_lock held, or from the first open(2), see comment there */
452 static int soc_camera_set_fmt(struct soc_camera_device *icd,
453 struct v4l2_format *f)
454 {
455 struct soc_camera_host *ici = to_soc_camera_host(icd->parent);
456 struct v4l2_pix_format *pix = &f->fmt.pix;
457 int ret;
458
459 dev_dbg(icd->pdev, "S_FMT(%c%c%c%c, %ux%u)\n",
460 pixfmtstr(pix->pixelformat), pix->width, pix->height);
461
462 /* We always call try_fmt() before set_fmt() or set_crop() */
463 ret = soc_camera_try_fmt(icd, f);
464 if (ret < 0)
465 return ret;
466
467 ret = ici->ops->set_fmt(icd, f);
468 if (ret < 0) {
469 return ret;
470 } else if (!icd->current_fmt ||
471 icd->current_fmt->host_fmt->fourcc != pix->pixelformat) {
472 dev_err(icd->pdev,
473 "Host driver hasn't set up current format correctly!\n");
474 return -EINVAL;
475 }
476
477 icd->user_width = pix->width;
478 icd->user_height = pix->height;
479 icd->bytesperline = pix->bytesperline;
480 icd->sizeimage = pix->sizeimage;
481 icd->colorspace = pix->colorspace;
482 icd->field = pix->field;
483 if (ici->ops->init_videobuf)
484 icd->vb_vidq.field = pix->field;
485
486 dev_dbg(icd->pdev, "set width: %d height: %d\n",
487 icd->user_width, icd->user_height);
488
489 /* set physical bus parameters */
490 return ici->ops->set_bus_param(icd);
491 }
492
493 static int soc_camera_open(struct file *file)
494 {
495 struct video_device *vdev = video_devdata(file);
496 struct soc_camera_device *icd = dev_get_drvdata(vdev->parent);
497 struct soc_camera_link *icl = to_soc_camera_link(icd);
498 struct soc_camera_host *ici;
499 int ret;
500
501 if (!to_soc_camera_control(icd))
502 /* No device driver attached */
503 return -ENODEV;
504
505 ici = to_soc_camera_host(icd->parent);
506
507 if (!try_module_get(ici->ops->owner)) {
508 dev_err(icd->pdev, "Couldn't lock capture bus driver.\n");
509 return -EINVAL;
510 }
511
512 icd->use_count++;
513
514 /* Now we really have to activate the camera */
515 if (icd->use_count == 1) {
516 /* Restore parameters before the last close() per V4L2 API */
517 struct v4l2_format f = {
518 .type = V4L2_BUF_TYPE_VIDEO_CAPTURE,
519 .fmt.pix = {
520 .width = icd->user_width,
521 .height = icd->user_height,
522 .field = icd->field,
523 .colorspace = icd->colorspace,
524 .pixelformat =
525 icd->current_fmt->host_fmt->fourcc,
526 },
527 };
528
529 /* The camera could have been already on, try to reset */
530 if (icl->reset)
531 icl->reset(icd->pdev);
532
533 ret = ici->ops->add(icd);
534 if (ret < 0) {
535 dev_err(icd->pdev, "Couldn't activate the camera: %d\n", ret);
536 goto eiciadd;
537 }
538
539 ret = soc_camera_power_on(icd, icl);
540 if (ret < 0)
541 goto epower;
542
543 pm_runtime_enable(&icd->vdev->dev);
544 ret = pm_runtime_resume(&icd->vdev->dev);
545 if (ret < 0 && ret != -ENOSYS)
546 goto eresume;
547
548 /*
549 * Try to configure with default parameters. Notice: this is the
550 * very first open, so, we cannot race against other calls,
551 * apart from someone else calling open() simultaneously, but
552 * .video_lock is protecting us against it.
553 */
554 ret = soc_camera_set_fmt(icd, &f);
555 if (ret < 0)
556 goto esfmt;
557
558 if (ici->ops->init_videobuf) {
559 ici->ops->init_videobuf(&icd->vb_vidq, icd);
560 } else {
561 ret = ici->ops->init_videobuf2(&icd->vb2_vidq, icd);
562 if (ret < 0)
563 goto einitvb;
564 }
565 v4l2_ctrl_handler_setup(&icd->ctrl_handler);
566 }
567
568 file->private_data = icd;
569 dev_dbg(icd->pdev, "camera device open\n");
570
571 return 0;
572
573 /*
574 * First four errors are entered with the .video_lock held
575 * and use_count == 1
576 */
577 einitvb:
578 esfmt:
579 pm_runtime_disable(&icd->vdev->dev);
580 eresume:
581 soc_camera_power_off(icd, icl);
582 epower:
583 ici->ops->remove(icd);
584 eiciadd:
585 icd->use_count--;
586 module_put(ici->ops->owner);
587
588 return ret;
589 }
590
591 static int soc_camera_close(struct file *file)
592 {
593 struct soc_camera_device *icd = file->private_data;
594 struct soc_camera_host *ici = to_soc_camera_host(icd->parent);
595
596 icd->use_count--;
597 if (!icd->use_count) {
598 struct soc_camera_link *icl = to_soc_camera_link(icd);
599
600 pm_runtime_suspend(&icd->vdev->dev);
601 pm_runtime_disable(&icd->vdev->dev);
602
603 if (ici->ops->init_videobuf2)
604 vb2_queue_release(&icd->vb2_vidq);
605 ici->ops->remove(icd);
606
607 soc_camera_power_off(icd, icl);
608 }
609
610 if (icd->streamer == file)
611 icd->streamer = NULL;
612
613 module_put(ici->ops->owner);
614
615 dev_dbg(icd->pdev, "camera device close\n");
616
617 return 0;
618 }
619
620 static ssize_t soc_camera_read(struct file *file, char __user *buf,
621 size_t count, loff_t *ppos)
622 {
623 struct soc_camera_device *icd = file->private_data;
624 int err = -EINVAL;
625
626 dev_err(icd->pdev, "camera device read not implemented\n");
627
628 return err;
629 }
630
631 static int soc_camera_mmap(struct file *file, struct vm_area_struct *vma)
632 {
633 struct soc_camera_device *icd = file->private_data;
634 struct soc_camera_host *ici = to_soc_camera_host(icd->parent);
635 int err;
636
637 dev_dbg(icd->pdev, "mmap called, vma=0x%08lx\n", (unsigned long)vma);
638
639 if (icd->streamer != file)
640 return -EBUSY;
641
642 if (ici->ops->init_videobuf)
643 err = videobuf_mmap_mapper(&icd->vb_vidq, vma);
644 else
645 err = vb2_mmap(&icd->vb2_vidq, vma);
646
647 dev_dbg(icd->pdev, "vma start=0x%08lx, size=%ld, ret=%d\n",
648 (unsigned long)vma->vm_start,
649 (unsigned long)vma->vm_end - (unsigned long)vma->vm_start,
650 err);
651
652 return err;
653 }
654
655 static unsigned int soc_camera_poll(struct file *file, poll_table *pt)
656 {
657 struct soc_camera_device *icd = file->private_data;
658 struct soc_camera_host *ici = to_soc_camera_host(icd->parent);
659
660 if (icd->streamer != file)
661 return -EBUSY;
662
663 if (ici->ops->init_videobuf && list_empty(&icd->vb_vidq.stream)) {
664 dev_err(icd->pdev, "Trying to poll with no queued buffers!\n");
665 return POLLERR;
666 }
667
668 return ici->ops->poll(file, pt);
669 }
670
671 void soc_camera_lock(struct vb2_queue *vq)
672 {
673 struct soc_camera_device *icd = vb2_get_drv_priv(vq);
674 mutex_lock(&icd->video_lock);
675 }
676 EXPORT_SYMBOL(soc_camera_lock);
677
678 void soc_camera_unlock(struct vb2_queue *vq)
679 {
680 struct soc_camera_device *icd = vb2_get_drv_priv(vq);
681 mutex_unlock(&icd->video_lock);
682 }
683 EXPORT_SYMBOL(soc_camera_unlock);
684
685 static struct v4l2_file_operations soc_camera_fops = {
686 .owner = THIS_MODULE,
687 .open = soc_camera_open,
688 .release = soc_camera_close,
689 .unlocked_ioctl = video_ioctl2,
690 .read = soc_camera_read,
691 .mmap = soc_camera_mmap,
692 .poll = soc_camera_poll,
693 };
694
695 static int soc_camera_s_fmt_vid_cap(struct file *file, void *priv,
696 struct v4l2_format *f)
697 {
698 struct soc_camera_device *icd = file->private_data;
699 int ret;
700
701 WARN_ON(priv != file->private_data);
702
703 if (f->type != V4L2_BUF_TYPE_VIDEO_CAPTURE) {
704 dev_warn(icd->pdev, "Wrong buf-type %d\n", f->type);
705 return -EINVAL;
706 }
707
708 if (icd->streamer && icd->streamer != file)
709 return -EBUSY;
710
711 if (is_streaming(to_soc_camera_host(icd->parent), icd)) {
712 dev_err(icd->pdev, "S_FMT denied: queue initialised\n");
713 return -EBUSY;
714 }
715
716 ret = soc_camera_set_fmt(icd, f);
717
718 if (!ret && !icd->streamer)
719 icd->streamer = file;
720
721 return ret;
722 }
723
724 static int soc_camera_enum_fmt_vid_cap(struct file *file, void *priv,
725 struct v4l2_fmtdesc *f)
726 {
727 struct soc_camera_device *icd = file->private_data;
728 const struct soc_mbus_pixelfmt *format;
729
730 WARN_ON(priv != file->private_data);
731
732 if (f->index >= icd->num_user_formats)
733 return -EINVAL;
734
735 format = icd->user_formats[f->index].host_fmt;
736
737 if (format->name)
738 strlcpy(f->description, format->name, sizeof(f->description));
739 f->pixelformat = format->fourcc;
740 return 0;
741 }
742
743 static int soc_camera_g_fmt_vid_cap(struct file *file, void *priv,
744 struct v4l2_format *f)
745 {
746 struct soc_camera_device *icd = file->private_data;
747 struct v4l2_pix_format *pix = &f->fmt.pix;
748
749 WARN_ON(priv != file->private_data);
750
751 if (f->type != V4L2_BUF_TYPE_VIDEO_CAPTURE)
752 return -EINVAL;
753
754 pix->width = icd->user_width;
755 pix->height = icd->user_height;
756 pix->bytesperline = icd->bytesperline;
757 pix->sizeimage = icd->sizeimage;
758 pix->field = icd->field;
759 pix->pixelformat = icd->current_fmt->host_fmt->fourcc;
760 pix->colorspace = icd->colorspace;
761 dev_dbg(icd->pdev, "current_fmt->fourcc: 0x%08x\n",
762 icd->current_fmt->host_fmt->fourcc);
763 return 0;
764 }
765
766 static int soc_camera_querycap(struct file *file, void *priv,
767 struct v4l2_capability *cap)
768 {
769 struct soc_camera_device *icd = file->private_data;
770 struct soc_camera_host *ici = to_soc_camera_host(icd->parent);
771
772 WARN_ON(priv != file->private_data);
773
774 strlcpy(cap->driver, ici->drv_name, sizeof(cap->driver));
775 return ici->ops->querycap(ici, cap);
776 }
777
778 static int soc_camera_streamon(struct file *file, void *priv,
779 enum v4l2_buf_type i)
780 {
781 struct soc_camera_device *icd = file->private_data;
782 struct soc_camera_host *ici = to_soc_camera_host(icd->parent);
783 struct v4l2_subdev *sd = soc_camera_to_subdev(icd);
784 int ret;
785
786 WARN_ON(priv != file->private_data);
787
788 if (i != V4L2_BUF_TYPE_VIDEO_CAPTURE)
789 return -EINVAL;
790
791 if (icd->streamer != file)
792 return -EBUSY;
793
794 /* This calls buf_queue from host driver's videobuf_queue_ops */
795 if (ici->ops->init_videobuf)
796 ret = videobuf_streamon(&icd->vb_vidq);
797 else
798 ret = vb2_streamon(&icd->vb2_vidq, i);
799
800 if (!ret)
801 v4l2_subdev_call(sd, video, s_stream, 1);
802
803 return ret;
804 }
805
806 static int soc_camera_streamoff(struct file *file, void *priv,
807 enum v4l2_buf_type i)
808 {
809 struct soc_camera_device *icd = file->private_data;
810 struct v4l2_subdev *sd = soc_camera_to_subdev(icd);
811 struct soc_camera_host *ici = to_soc_camera_host(icd->parent);
812
813 WARN_ON(priv != file->private_data);
814
815 if (i != V4L2_BUF_TYPE_VIDEO_CAPTURE)
816 return -EINVAL;
817
818 if (icd->streamer != file)
819 return -EBUSY;
820
821 /*
822 * This calls buf_release from host driver's videobuf_queue_ops for all
823 * remaining buffers. When the last buffer is freed, stop capture
824 */
825 if (ici->ops->init_videobuf)
826 videobuf_streamoff(&icd->vb_vidq);
827 else
828 vb2_streamoff(&icd->vb2_vidq, i);
829
830 v4l2_subdev_call(sd, video, s_stream, 0);
831
832 return 0;
833 }
834
835 static int soc_camera_cropcap(struct file *file, void *fh,
836 struct v4l2_cropcap *a)
837 {
838 struct soc_camera_device *icd = file->private_data;
839 struct soc_camera_host *ici = to_soc_camera_host(icd->parent);
840
841 return ici->ops->cropcap(icd, a);
842 }
843
844 static int soc_camera_g_crop(struct file *file, void *fh,
845 struct v4l2_crop *a)
846 {
847 struct soc_camera_device *icd = file->private_data;
848 struct soc_camera_host *ici = to_soc_camera_host(icd->parent);
849 int ret;
850
851 ret = ici->ops->get_crop(icd, a);
852
853 return ret;
854 }
855
856 /*
857 * According to the V4L2 API, drivers shall not update the struct v4l2_crop
858 * argument with the actual geometry, instead, the user shall use G_CROP to
859 * retrieve it.
860 */
861 static int soc_camera_s_crop(struct file *file, void *fh,
862 struct v4l2_crop *a)
863 {
864 struct soc_camera_device *icd = file->private_data;
865 struct soc_camera_host *ici = to_soc_camera_host(icd->parent);
866 struct v4l2_rect *rect = &a->c;
867 struct v4l2_crop current_crop;
868 int ret;
869
870 if (a->type != V4L2_BUF_TYPE_VIDEO_CAPTURE)
871 return -EINVAL;
872
873 dev_dbg(icd->pdev, "S_CROP(%ux%u@%u:%u)\n",
874 rect->width, rect->height, rect->left, rect->top);
875
876 /* If get_crop fails, we'll let host and / or client drivers decide */
877 ret = ici->ops->get_crop(icd, &current_crop);
878
879 /* Prohibit window size change with initialised buffers */
880 if (ret < 0) {
881 dev_err(icd->pdev,
882 "S_CROP denied: getting current crop failed\n");
883 } else if ((a->c.width == current_crop.c.width &&
884 a->c.height == current_crop.c.height) ||
885 !is_streaming(ici, icd)) {
886 /* same size or not streaming - use .set_crop() */
887 ret = ici->ops->set_crop(icd, a);
888 } else if (ici->ops->set_livecrop) {
889 ret = ici->ops->set_livecrop(icd, a);
890 } else {
891 dev_err(icd->pdev,
892 "S_CROP denied: queue initialised and sizes differ\n");
893 ret = -EBUSY;
894 }
895
896 return ret;
897 }
898
899 static int soc_camera_g_parm(struct file *file, void *fh,
900 struct v4l2_streamparm *a)
901 {
902 struct soc_camera_device *icd = file->private_data;
903 struct soc_camera_host *ici = to_soc_camera_host(icd->parent);
904
905 if (ici->ops->get_parm)
906 return ici->ops->get_parm(icd, a);
907
908 return -ENOIOCTLCMD;
909 }
910
911 static int soc_camera_s_parm(struct file *file, void *fh,
912 struct v4l2_streamparm *a)
913 {
914 struct soc_camera_device *icd = file->private_data;
915 struct soc_camera_host *ici = to_soc_camera_host(icd->parent);
916
917 if (ici->ops->set_parm)
918 return ici->ops->set_parm(icd, a);
919
920 return -ENOIOCTLCMD;
921 }
922
923 static int soc_camera_g_chip_ident(struct file *file, void *fh,
924 struct v4l2_dbg_chip_ident *id)
925 {
926 struct soc_camera_device *icd = file->private_data;
927 struct v4l2_subdev *sd = soc_camera_to_subdev(icd);
928
929 return v4l2_subdev_call(sd, core, g_chip_ident, id);
930 }
931
932 #ifdef CONFIG_VIDEO_ADV_DEBUG
933 static int soc_camera_g_register(struct file *file, void *fh,
934 struct v4l2_dbg_register *reg)
935 {
936 struct soc_camera_device *icd = file->private_data;
937 struct v4l2_subdev *sd = soc_camera_to_subdev(icd);
938
939 return v4l2_subdev_call(sd, core, g_register, reg);
940 }
941
942 static int soc_camera_s_register(struct file *file, void *fh,
943 struct v4l2_dbg_register *reg)
944 {
945 struct soc_camera_device *icd = file->private_data;
946 struct v4l2_subdev *sd = soc_camera_to_subdev(icd);
947
948 return v4l2_subdev_call(sd, core, s_register, reg);
949 }
950 #endif
951
952 static int soc_camera_probe(struct soc_camera_device *icd);
953
954 /* So far this function cannot fail */
955 static void scan_add_host(struct soc_camera_host *ici)
956 {
957 struct soc_camera_device *icd;
958
959 mutex_lock(&list_lock);
960
961 list_for_each_entry(icd, &devices, list) {
962 if (icd->iface == ici->nr) {
963 int ret;
964
965 icd->parent = ici->v4l2_dev.dev;
966 ret = soc_camera_probe(icd);
967 }
968 }
969
970 mutex_unlock(&list_lock);
971 }
972
973 #ifdef CONFIG_I2C_BOARDINFO
974 static int soc_camera_init_i2c(struct soc_camera_device *icd,
975 struct soc_camera_link *icl)
976 {
977 struct i2c_client *client;
978 struct soc_camera_host *ici = to_soc_camera_host(icd->parent);
979 struct i2c_adapter *adap = i2c_get_adapter(icl->i2c_adapter_id);
980 struct v4l2_subdev *subdev;
981
982 if (!adap) {
983 dev_err(icd->pdev, "Cannot get I2C adapter #%d. No driver?\n",
984 icl->i2c_adapter_id);
985 goto ei2cga;
986 }
987
988 icl->board_info->platform_data = icl;
989
990 subdev = v4l2_i2c_new_subdev_board(&ici->v4l2_dev, adap,
991 icl->board_info, NULL);
992 if (!subdev)
993 goto ei2cnd;
994
995 client = v4l2_get_subdevdata(subdev);
996
997 /* Use to_i2c_client(dev) to recover the i2c client */
998 icd->control = &client->dev;
999
1000 return 0;
1001 ei2cnd:
1002 i2c_put_adapter(adap);
1003 ei2cga:
1004 return -ENODEV;
1005 }
1006
1007 static void soc_camera_free_i2c(struct soc_camera_device *icd)
1008 {
1009 struct i2c_client *client =
1010 to_i2c_client(to_soc_camera_control(icd));
1011 struct i2c_adapter *adap = client->adapter;
1012
1013 icd->control = NULL;
1014 v4l2_device_unregister_subdev(i2c_get_clientdata(client));
1015 i2c_unregister_device(client);
1016 i2c_put_adapter(adap);
1017 }
1018 #else
1019 #define soc_camera_init_i2c(icd, icl) (-ENODEV)
1020 #define soc_camera_free_i2c(icd) do {} while (0)
1021 #endif
1022
1023 static int soc_camera_video_start(struct soc_camera_device *icd);
1024 static int video_dev_create(struct soc_camera_device *icd);
1025 /* Called during host-driver probe */
1026 static int soc_camera_probe(struct soc_camera_device *icd)
1027 {
1028 struct soc_camera_host *ici = to_soc_camera_host(icd->parent);
1029 struct soc_camera_link *icl = to_soc_camera_link(icd);
1030 struct device *control = NULL;
1031 struct v4l2_subdev *sd;
1032 struct v4l2_mbus_framefmt mf;
1033 int ret;
1034
1035 dev_info(icd->pdev, "Probing %s\n", dev_name(icd->pdev));
1036
1037 /*
1038 * Currently the subdev with the largest number of controls (13) is
1039 * ov6550. So let's pick 16 as a hint for the control handler. Note
1040 * that this is a hint only: too large and you waste some memory, too
1041 * small and there is a (very) small performance hit when looking up
1042 * controls in the internal hash.
1043 */
1044 ret = v4l2_ctrl_handler_init(&icd->ctrl_handler, 16);
1045 if (ret < 0)
1046 return ret;
1047
1048 ret = regulator_bulk_get(icd->pdev, icl->num_regulators,
1049 icl->regulators);
1050 if (ret < 0)
1051 goto ereg;
1052
1053 /* The camera could have been already on, try to reset */
1054 if (icl->reset)
1055 icl->reset(icd->pdev);
1056
1057 ret = ici->ops->add(icd);
1058 if (ret < 0)
1059 goto eadd;
1060
1061 /*
1062 * This will not yet call v4l2_subdev_core_ops::s_power(1), because the
1063 * subdevice has not been initialised yet. We'll have to call it once
1064 * again after initialisation, even though it shouldn't be needed, we
1065 * don't do any IO here.
1066 */
1067 ret = soc_camera_power_on(icd, icl);
1068 if (ret < 0)
1069 goto epower;
1070
1071 /* Must have icd->vdev before registering the device */
1072 ret = video_dev_create(icd);
1073 if (ret < 0)
1074 goto evdc;
1075
1076 /* Non-i2c cameras, e.g., soc_camera_platform, have no board_info */
1077 if (icl->board_info) {
1078 ret = soc_camera_init_i2c(icd, icl);
1079 if (ret < 0)
1080 goto eadddev;
1081 } else if (!icl->add_device || !icl->del_device) {
1082 ret = -EINVAL;
1083 goto eadddev;
1084 } else {
1085 if (icl->module_name)
1086 ret = request_module(icl->module_name);
1087
1088 ret = icl->add_device(icd);
1089 if (ret < 0)
1090 goto eadddev;
1091
1092 /*
1093 * FIXME: this is racy, have to use driver-binding notification,
1094 * when it is available
1095 */
1096 control = to_soc_camera_control(icd);
1097 if (!control || !control->driver || !dev_get_drvdata(control) ||
1098 !try_module_get(control->driver->owner)) {
1099 icl->del_device(icd);
1100 ret = -ENODEV;
1101 goto enodrv;
1102 }
1103 }
1104
1105 sd = soc_camera_to_subdev(icd);
1106 sd->grp_id = soc_camera_grp_id(icd);
1107 v4l2_set_subdev_hostdata(sd, icd);
1108
1109 if (v4l2_ctrl_add_handler(&icd->ctrl_handler, sd->ctrl_handler))
1110 goto ectrl;
1111
1112 /* At this point client .probe() should have run already */
1113 ret = soc_camera_init_user_formats(icd);
1114 if (ret < 0)
1115 goto eiufmt;
1116
1117 icd->field = V4L2_FIELD_ANY;
1118
1119 /*
1120 * ..._video_start() will create a device node, video_register_device()
1121 * itself is protected against concurrent open() calls, but we also have
1122 * to protect our data.
1123 */
1124 mutex_lock(&icd->video_lock);
1125
1126 ret = soc_camera_video_start(icd);
1127 if (ret < 0)
1128 goto evidstart;
1129
1130 ret = v4l2_subdev_call(sd, core, s_power, 1);
1131 if (ret < 0 && ret != -ENOIOCTLCMD)
1132 goto esdpwr;
1133
1134 /* Try to improve our guess of a reasonable window format */
1135 if (!v4l2_subdev_call(sd, video, g_mbus_fmt, &mf)) {
1136 icd->user_width = mf.width;
1137 icd->user_height = mf.height;
1138 icd->colorspace = mf.colorspace;
1139 icd->field = mf.field;
1140 }
1141
1142 ici->ops->remove(icd);
1143
1144 soc_camera_power_off(icd, icl);
1145
1146 mutex_unlock(&icd->video_lock);
1147
1148 return 0;
1149
1150 esdpwr:
1151 video_unregister_device(icd->vdev);
1152 evidstart:
1153 mutex_unlock(&icd->video_lock);
1154 soc_camera_free_user_formats(icd);
1155 eiufmt:
1156 ectrl:
1157 if (icl->board_info) {
1158 soc_camera_free_i2c(icd);
1159 } else {
1160 icl->del_device(icd);
1161 module_put(control->driver->owner);
1162 }
1163 enodrv:
1164 eadddev:
1165 video_device_release(icd->vdev);
1166 icd->vdev = NULL;
1167 evdc:
1168 soc_camera_power_off(icd, icl);
1169 epower:
1170 ici->ops->remove(icd);
1171 eadd:
1172 regulator_bulk_free(icl->num_regulators, icl->regulators);
1173 ereg:
1174 v4l2_ctrl_handler_free(&icd->ctrl_handler);
1175 return ret;
1176 }
1177
1178 /*
1179 * This is called on device_unregister, which only means we have to disconnect
1180 * from the host, but not remove ourselves from the device list
1181 */
1182 static int soc_camera_remove(struct soc_camera_device *icd)
1183 {
1184 struct soc_camera_link *icl = to_soc_camera_link(icd);
1185 struct video_device *vdev = icd->vdev;
1186
1187 BUG_ON(!icd->parent);
1188
1189 v4l2_ctrl_handler_free(&icd->ctrl_handler);
1190 if (vdev) {
1191 video_unregister_device(vdev);
1192 icd->vdev = NULL;
1193 }
1194
1195 if (icl->board_info) {
1196 soc_camera_free_i2c(icd);
1197 } else {
1198 struct device_driver *drv = to_soc_camera_control(icd)->driver;
1199 if (drv) {
1200 icl->del_device(icd);
1201 module_put(drv->owner);
1202 }
1203 }
1204 soc_camera_free_user_formats(icd);
1205
1206 regulator_bulk_free(icl->num_regulators, icl->regulators);
1207
1208 return 0;
1209 }
1210
1211 static int default_cropcap(struct soc_camera_device *icd,
1212 struct v4l2_cropcap *a)
1213 {
1214 struct v4l2_subdev *sd = soc_camera_to_subdev(icd);
1215 return v4l2_subdev_call(sd, video, cropcap, a);
1216 }
1217
1218 static int default_g_crop(struct soc_camera_device *icd, struct v4l2_crop *a)
1219 {
1220 struct v4l2_subdev *sd = soc_camera_to_subdev(icd);
1221 return v4l2_subdev_call(sd, video, g_crop, a);
1222 }
1223
1224 static int default_s_crop(struct soc_camera_device *icd, struct v4l2_crop *a)
1225 {
1226 struct v4l2_subdev *sd = soc_camera_to_subdev(icd);
1227 return v4l2_subdev_call(sd, video, s_crop, a);
1228 }
1229
1230 static int default_g_parm(struct soc_camera_device *icd,
1231 struct v4l2_streamparm *parm)
1232 {
1233 struct v4l2_subdev *sd = soc_camera_to_subdev(icd);
1234 return v4l2_subdev_call(sd, video, g_parm, parm);
1235 }
1236
1237 static int default_s_parm(struct soc_camera_device *icd,
1238 struct v4l2_streamparm *parm)
1239 {
1240 struct v4l2_subdev *sd = soc_camera_to_subdev(icd);
1241 return v4l2_subdev_call(sd, video, s_parm, parm);
1242 }
1243
1244 static int default_enum_fsizes(struct soc_camera_device *icd,
1245 struct v4l2_frmsizeenum *fsize)
1246 {
1247 int ret;
1248 struct v4l2_subdev *sd = soc_camera_to_subdev(icd);
1249 const struct soc_camera_format_xlate *xlate;
1250 __u32 pixfmt = fsize->pixel_format;
1251 struct v4l2_frmsizeenum fsize_mbus = *fsize;
1252
1253 xlate = soc_camera_xlate_by_fourcc(icd, pixfmt);
1254 if (!xlate)
1255 return -EINVAL;
1256 /* map xlate-code to pixel_format, sensor only handle xlate-code*/
1257 fsize_mbus.pixel_format = xlate->code;
1258
1259 ret = v4l2_subdev_call(sd, video, enum_mbus_fsizes, &fsize_mbus);
1260 if (ret < 0)
1261 return ret;
1262
1263 *fsize = fsize_mbus;
1264 fsize->pixel_format = pixfmt;
1265
1266 return 0;
1267 }
1268
1269 int soc_camera_host_register(struct soc_camera_host *ici)
1270 {
1271 struct soc_camera_host *ix;
1272 int ret;
1273
1274 if (!ici || !ici->ops ||
1275 !ici->ops->try_fmt ||
1276 !ici->ops->set_fmt ||
1277 !ici->ops->set_bus_param ||
1278 !ici->ops->querycap ||
1279 ((!ici->ops->init_videobuf ||
1280 !ici->ops->reqbufs) &&
1281 !ici->ops->init_videobuf2) ||
1282 !ici->ops->add ||
1283 !ici->ops->remove ||
1284 !ici->ops->poll ||
1285 !ici->v4l2_dev.dev)
1286 return -EINVAL;
1287
1288 if (!ici->ops->set_crop)
1289 ici->ops->set_crop = default_s_crop;
1290 if (!ici->ops->get_crop)
1291 ici->ops->get_crop = default_g_crop;
1292 if (!ici->ops->cropcap)
1293 ici->ops->cropcap = default_cropcap;
1294 if (!ici->ops->set_parm)
1295 ici->ops->set_parm = default_s_parm;
1296 if (!ici->ops->get_parm)
1297 ici->ops->get_parm = default_g_parm;
1298 if (!ici->ops->enum_fsizes)
1299 ici->ops->enum_fsizes = default_enum_fsizes;
1300
1301 mutex_lock(&list_lock);
1302 list_for_each_entry(ix, &hosts, list) {
1303 if (ix->nr == ici->nr) {
1304 ret = -EBUSY;
1305 goto edevreg;
1306 }
1307 }
1308
1309 ret = v4l2_device_register(ici->v4l2_dev.dev, &ici->v4l2_dev);
1310 if (ret < 0)
1311 goto edevreg;
1312
1313 list_add_tail(&ici->list, &hosts);
1314 mutex_unlock(&list_lock);
1315
1316 scan_add_host(ici);
1317
1318 return 0;
1319
1320 edevreg:
1321 mutex_unlock(&list_lock);
1322 return ret;
1323 }
1324 EXPORT_SYMBOL(soc_camera_host_register);
1325
1326 /* Unregister all clients! */
1327 void soc_camera_host_unregister(struct soc_camera_host *ici)
1328 {
1329 struct soc_camera_device *icd;
1330
1331 mutex_lock(&list_lock);
1332
1333 list_del(&ici->list);
1334 list_for_each_entry(icd, &devices, list)
1335 if (icd->iface == ici->nr && to_soc_camera_control(icd))
1336 soc_camera_remove(icd);
1337
1338 mutex_unlock(&list_lock);
1339
1340 v4l2_device_unregister(&ici->v4l2_dev);
1341 }
1342 EXPORT_SYMBOL(soc_camera_host_unregister);
1343
1344 /* Image capture device */
1345 static int soc_camera_device_register(struct soc_camera_device *icd)
1346 {
1347 struct soc_camera_device *ix;
1348 int num = -1, i;
1349
1350 for (i = 0; i < 256 && num < 0; i++) {
1351 num = i;
1352 /* Check if this index is available on this interface */
1353 list_for_each_entry(ix, &devices, list) {
1354 if (ix->iface == icd->iface && ix->devnum == i) {
1355 num = -1;
1356 break;
1357 }
1358 }
1359 }
1360
1361 if (num < 0)
1362 /*
1363 * ok, we have 256 cameras on this host...
1364 * man, stay reasonable...
1365 */
1366 return -ENOMEM;
1367
1368 icd->devnum = num;
1369 icd->use_count = 0;
1370 icd->host_priv = NULL;
1371 mutex_init(&icd->video_lock);
1372
1373 list_add_tail(&icd->list, &devices);
1374
1375 return 0;
1376 }
1377
1378 static const struct v4l2_ioctl_ops soc_camera_ioctl_ops = {
1379 .vidioc_querycap = soc_camera_querycap,
1380 .vidioc_try_fmt_vid_cap = soc_camera_try_fmt_vid_cap,
1381 .vidioc_g_fmt_vid_cap = soc_camera_g_fmt_vid_cap,
1382 .vidioc_s_fmt_vid_cap = soc_camera_s_fmt_vid_cap,
1383 .vidioc_enum_fmt_vid_cap = soc_camera_enum_fmt_vid_cap,
1384 .vidioc_enum_input = soc_camera_enum_input,
1385 .vidioc_g_input = soc_camera_g_input,
1386 .vidioc_s_input = soc_camera_s_input,
1387 .vidioc_s_std = soc_camera_s_std,
1388 .vidioc_g_std = soc_camera_g_std,
1389 .vidioc_enum_framesizes = soc_camera_enum_fsizes,
1390 .vidioc_reqbufs = soc_camera_reqbufs,
1391 .vidioc_querybuf = soc_camera_querybuf,
1392 .vidioc_qbuf = soc_camera_qbuf,
1393 .vidioc_dqbuf = soc_camera_dqbuf,
1394 .vidioc_create_bufs = soc_camera_create_bufs,
1395 .vidioc_prepare_buf = soc_camera_prepare_buf,
1396 .vidioc_streamon = soc_camera_streamon,
1397 .vidioc_streamoff = soc_camera_streamoff,
1398 .vidioc_cropcap = soc_camera_cropcap,
1399 .vidioc_g_crop = soc_camera_g_crop,
1400 .vidioc_s_crop = soc_camera_s_crop,
1401 .vidioc_g_parm = soc_camera_g_parm,
1402 .vidioc_s_parm = soc_camera_s_parm,
1403 .vidioc_g_chip_ident = soc_camera_g_chip_ident,
1404 #ifdef CONFIG_VIDEO_ADV_DEBUG
1405 .vidioc_g_register = soc_camera_g_register,
1406 .vidioc_s_register = soc_camera_s_register,
1407 #endif
1408 };
1409
1410 static int video_dev_create(struct soc_camera_device *icd)
1411 {
1412 struct soc_camera_host *ici = to_soc_camera_host(icd->parent);
1413 struct video_device *vdev = video_device_alloc();
1414
1415 if (!vdev)
1416 return -ENOMEM;
1417
1418 strlcpy(vdev->name, ici->drv_name, sizeof(vdev->name));
1419
1420 vdev->parent = icd->pdev;
1421 vdev->current_norm = V4L2_STD_UNKNOWN;
1422 vdev->fops = &soc_camera_fops;
1423 vdev->ioctl_ops = &soc_camera_ioctl_ops;
1424 vdev->release = video_device_release;
1425 vdev->tvnorms = V4L2_STD_UNKNOWN;
1426 vdev->ctrl_handler = &icd->ctrl_handler;
1427 vdev->lock = &icd->video_lock;
1428
1429 icd->vdev = vdev;
1430
1431 return 0;
1432 }
1433
1434 /*
1435 * Called from soc_camera_probe() above (with .video_lock held???)
1436 */
1437 static int soc_camera_video_start(struct soc_camera_device *icd)
1438 {
1439 const struct device_type *type = icd->vdev->dev.type;
1440 int ret;
1441
1442 if (!icd->parent)
1443 return -ENODEV;
1444
1445 ret = video_register_device(icd->vdev, VFL_TYPE_GRABBER, -1);
1446 if (ret < 0) {
1447 dev_err(icd->pdev, "video_register_device failed: %d\n", ret);
1448 return ret;
1449 }
1450
1451 /* Restore device type, possibly set by the subdevice driver */
1452 icd->vdev->dev.type = type;
1453
1454 return 0;
1455 }
1456
1457 static int __devinit soc_camera_pdrv_probe(struct platform_device *pdev)
1458 {
1459 struct soc_camera_link *icl = pdev->dev.platform_data;
1460 struct soc_camera_device *icd;
1461 int ret;
1462
1463 if (!icl)
1464 return -EINVAL;
1465
1466 icd = kzalloc(sizeof(*icd), GFP_KERNEL);
1467 if (!icd)
1468 return -ENOMEM;
1469
1470 icd->iface = icl->bus_id;
1471 icd->link = icl;
1472 icd->pdev = &pdev->dev;
1473 platform_set_drvdata(pdev, icd);
1474
1475 ret = soc_camera_device_register(icd);
1476 if (ret < 0)
1477 goto escdevreg;
1478
1479 icd->user_width = DEFAULT_WIDTH;
1480 icd->user_height = DEFAULT_HEIGHT;
1481
1482 return 0;
1483
1484 escdevreg:
1485 kfree(icd);
1486
1487 return ret;
1488 }
1489
1490 /*
1491 * Only called on rmmod for each platform device, since they are not
1492 * hot-pluggable. Now we know, that all our users - hosts and devices have
1493 * been unloaded already
1494 */
1495 static int __devexit soc_camera_pdrv_remove(struct platform_device *pdev)
1496 {
1497 struct soc_camera_device *icd = platform_get_drvdata(pdev);
1498
1499 if (!icd)
1500 return -EINVAL;
1501
1502 list_del(&icd->list);
1503
1504 kfree(icd);
1505
1506 return 0;
1507 }
1508
1509 static struct platform_driver __refdata soc_camera_pdrv = {
1510 .remove = __devexit_p(soc_camera_pdrv_remove),
1511 .driver = {
1512 .name = "soc-camera-pdrv",
1513 .owner = THIS_MODULE,
1514 },
1515 };
1516
1517 static int __init soc_camera_init(void)
1518 {
1519 return platform_driver_probe(&soc_camera_pdrv, soc_camera_pdrv_probe);
1520 }
1521
1522 static void __exit soc_camera_exit(void)
1523 {
1524 platform_driver_unregister(&soc_camera_pdrv);
1525 }
1526
1527 module_init(soc_camera_init);
1528 module_exit(soc_camera_exit);
1529
1530 MODULE_DESCRIPTION("Image capture bus driver");
1531 MODULE_AUTHOR("Guennadi Liakhovetski <kernel@pengutronix.de>");
1532 MODULE_LICENSE("GPL");
1533 MODULE_ALIAS("platform:soc-camera-pdrv");
Linux kernel - Deliverables
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