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[media] V4L: soc-camera: (cosmetic) use a more explicit name for a host handler
[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_framesizes(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_framesizes(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 /* Don't mess with the host during probe */
534 mutex_lock(&ici->host_lock);
535 ret = ici->ops->add(icd);
536 mutex_unlock(&ici->host_lock);
537 if (ret < 0) {
538 dev_err(icd->pdev, "Couldn't activate the camera: %d\n", ret);
539 goto eiciadd;
540 }
541
542 ret = soc_camera_power_on(icd, icl);
543 if (ret < 0)
544 goto epower;
545
546 pm_runtime_enable(&icd->vdev->dev);
547 ret = pm_runtime_resume(&icd->vdev->dev);
548 if (ret < 0 && ret != -ENOSYS)
549 goto eresume;
550
551 /*
552 * Try to configure with default parameters. Notice: this is the
553 * very first open, so, we cannot race against other calls,
554 * apart from someone else calling open() simultaneously, but
555 * .video_lock is protecting us against it.
556 */
557 ret = soc_camera_set_fmt(icd, &f);
558 if (ret < 0)
559 goto esfmt;
560
561 if (ici->ops->init_videobuf) {
562 ici->ops->init_videobuf(&icd->vb_vidq, icd);
563 } else {
564 ret = ici->ops->init_videobuf2(&icd->vb2_vidq, icd);
565 if (ret < 0)
566 goto einitvb;
567 }
568 v4l2_ctrl_handler_setup(&icd->ctrl_handler);
569 }
570
571 file->private_data = icd;
572 dev_dbg(icd->pdev, "camera device open\n");
573
574 return 0;
575
576 /*
577 * First four errors are entered with the .video_lock held
578 * and use_count == 1
579 */
580 einitvb:
581 esfmt:
582 pm_runtime_disable(&icd->vdev->dev);
583 eresume:
584 soc_camera_power_off(icd, icl);
585 epower:
586 ici->ops->remove(icd);
587 eiciadd:
588 icd->use_count--;
589 module_put(ici->ops->owner);
590
591 return ret;
592 }
593
594 static int soc_camera_close(struct file *file)
595 {
596 struct soc_camera_device *icd = file->private_data;
597 struct soc_camera_host *ici = to_soc_camera_host(icd->parent);
598
599 icd->use_count--;
600 if (!icd->use_count) {
601 struct soc_camera_link *icl = to_soc_camera_link(icd);
602
603 pm_runtime_suspend(&icd->vdev->dev);
604 pm_runtime_disable(&icd->vdev->dev);
605
606 if (ici->ops->init_videobuf2)
607 vb2_queue_release(&icd->vb2_vidq);
608 ici->ops->remove(icd);
609
610 soc_camera_power_off(icd, icl);
611 }
612
613 if (icd->streamer == file)
614 icd->streamer = NULL;
615
616 module_put(ici->ops->owner);
617
618 dev_dbg(icd->pdev, "camera device close\n");
619
620 return 0;
621 }
622
623 static ssize_t soc_camera_read(struct file *file, char __user *buf,
624 size_t count, loff_t *ppos)
625 {
626 struct soc_camera_device *icd = file->private_data;
627 int err = -EINVAL;
628
629 dev_err(icd->pdev, "camera device read not implemented\n");
630
631 return err;
632 }
633
634 static int soc_camera_mmap(struct file *file, struct vm_area_struct *vma)
635 {
636 struct soc_camera_device *icd = file->private_data;
637 struct soc_camera_host *ici = to_soc_camera_host(icd->parent);
638 int err;
639
640 dev_dbg(icd->pdev, "mmap called, vma=0x%08lx\n", (unsigned long)vma);
641
642 if (icd->streamer != file)
643 return -EBUSY;
644
645 if (ici->ops->init_videobuf)
646 err = videobuf_mmap_mapper(&icd->vb_vidq, vma);
647 else
648 err = vb2_mmap(&icd->vb2_vidq, vma);
649
650 dev_dbg(icd->pdev, "vma start=0x%08lx, size=%ld, ret=%d\n",
651 (unsigned long)vma->vm_start,
652 (unsigned long)vma->vm_end - (unsigned long)vma->vm_start,
653 err);
654
655 return err;
656 }
657
658 static unsigned int soc_camera_poll(struct file *file, poll_table *pt)
659 {
660 struct soc_camera_device *icd = file->private_data;
661 struct soc_camera_host *ici = to_soc_camera_host(icd->parent);
662
663 if (icd->streamer != file)
664 return -EBUSY;
665
666 if (ici->ops->init_videobuf && list_empty(&icd->vb_vidq.stream)) {
667 dev_err(icd->pdev, "Trying to poll with no queued buffers!\n");
668 return POLLERR;
669 }
670
671 return ici->ops->poll(file, pt);
672 }
673
674 void soc_camera_lock(struct vb2_queue *vq)
675 {
676 struct soc_camera_device *icd = vb2_get_drv_priv(vq);
677 mutex_lock(&icd->video_lock);
678 }
679 EXPORT_SYMBOL(soc_camera_lock);
680
681 void soc_camera_unlock(struct vb2_queue *vq)
682 {
683 struct soc_camera_device *icd = vb2_get_drv_priv(vq);
684 mutex_unlock(&icd->video_lock);
685 }
686 EXPORT_SYMBOL(soc_camera_unlock);
687
688 static struct v4l2_file_operations soc_camera_fops = {
689 .owner = THIS_MODULE,
690 .open = soc_camera_open,
691 .release = soc_camera_close,
692 .unlocked_ioctl = video_ioctl2,
693 .read = soc_camera_read,
694 .mmap = soc_camera_mmap,
695 .poll = soc_camera_poll,
696 };
697
698 static int soc_camera_s_fmt_vid_cap(struct file *file, void *priv,
699 struct v4l2_format *f)
700 {
701 struct soc_camera_device *icd = file->private_data;
702 int ret;
703
704 WARN_ON(priv != file->private_data);
705
706 if (f->type != V4L2_BUF_TYPE_VIDEO_CAPTURE) {
707 dev_warn(icd->pdev, "Wrong buf-type %d\n", f->type);
708 return -EINVAL;
709 }
710
711 if (icd->streamer && icd->streamer != file)
712 return -EBUSY;
713
714 if (is_streaming(to_soc_camera_host(icd->parent), icd)) {
715 dev_err(icd->pdev, "S_FMT denied: queue initialised\n");
716 return -EBUSY;
717 }
718
719 ret = soc_camera_set_fmt(icd, f);
720
721 if (!ret && !icd->streamer)
722 icd->streamer = file;
723
724 return ret;
725 }
726
727 static int soc_camera_enum_fmt_vid_cap(struct file *file, void *priv,
728 struct v4l2_fmtdesc *f)
729 {
730 struct soc_camera_device *icd = file->private_data;
731 const struct soc_mbus_pixelfmt *format;
732
733 WARN_ON(priv != file->private_data);
734
735 if (f->index >= icd->num_user_formats)
736 return -EINVAL;
737
738 format = icd->user_formats[f->index].host_fmt;
739
740 if (format->name)
741 strlcpy(f->description, format->name, sizeof(f->description));
742 f->pixelformat = format->fourcc;
743 return 0;
744 }
745
746 static int soc_camera_g_fmt_vid_cap(struct file *file, void *priv,
747 struct v4l2_format *f)
748 {
749 struct soc_camera_device *icd = file->private_data;
750 struct v4l2_pix_format *pix = &f->fmt.pix;
751
752 WARN_ON(priv != file->private_data);
753
754 if (f->type != V4L2_BUF_TYPE_VIDEO_CAPTURE)
755 return -EINVAL;
756
757 pix->width = icd->user_width;
758 pix->height = icd->user_height;
759 pix->bytesperline = icd->bytesperline;
760 pix->sizeimage = icd->sizeimage;
761 pix->field = icd->field;
762 pix->pixelformat = icd->current_fmt->host_fmt->fourcc;
763 pix->colorspace = icd->colorspace;
764 dev_dbg(icd->pdev, "current_fmt->fourcc: 0x%08x\n",
765 icd->current_fmt->host_fmt->fourcc);
766 return 0;
767 }
768
769 static int soc_camera_querycap(struct file *file, void *priv,
770 struct v4l2_capability *cap)
771 {
772 struct soc_camera_device *icd = file->private_data;
773 struct soc_camera_host *ici = to_soc_camera_host(icd->parent);
774
775 WARN_ON(priv != file->private_data);
776
777 strlcpy(cap->driver, ici->drv_name, sizeof(cap->driver));
778 return ici->ops->querycap(ici, cap);
779 }
780
781 static int soc_camera_streamon(struct file *file, void *priv,
782 enum v4l2_buf_type i)
783 {
784 struct soc_camera_device *icd = file->private_data;
785 struct soc_camera_host *ici = to_soc_camera_host(icd->parent);
786 struct v4l2_subdev *sd = soc_camera_to_subdev(icd);
787 int ret;
788
789 WARN_ON(priv != file->private_data);
790
791 if (i != V4L2_BUF_TYPE_VIDEO_CAPTURE)
792 return -EINVAL;
793
794 if (icd->streamer != file)
795 return -EBUSY;
796
797 /* This calls buf_queue from host driver's videobuf_queue_ops */
798 if (ici->ops->init_videobuf)
799 ret = videobuf_streamon(&icd->vb_vidq);
800 else
801 ret = vb2_streamon(&icd->vb2_vidq, i);
802
803 if (!ret)
804 v4l2_subdev_call(sd, video, s_stream, 1);
805
806 return ret;
807 }
808
809 static int soc_camera_streamoff(struct file *file, void *priv,
810 enum v4l2_buf_type i)
811 {
812 struct soc_camera_device *icd = file->private_data;
813 struct v4l2_subdev *sd = soc_camera_to_subdev(icd);
814 struct soc_camera_host *ici = to_soc_camera_host(icd->parent);
815
816 WARN_ON(priv != file->private_data);
817
818 if (i != V4L2_BUF_TYPE_VIDEO_CAPTURE)
819 return -EINVAL;
820
821 if (icd->streamer != file)
822 return -EBUSY;
823
824 /*
825 * This calls buf_release from host driver's videobuf_queue_ops for all
826 * remaining buffers. When the last buffer is freed, stop capture
827 */
828 if (ici->ops->init_videobuf)
829 videobuf_streamoff(&icd->vb_vidq);
830 else
831 vb2_streamoff(&icd->vb2_vidq, i);
832
833 v4l2_subdev_call(sd, video, s_stream, 0);
834
835 return 0;
836 }
837
838 static int soc_camera_cropcap(struct file *file, void *fh,
839 struct v4l2_cropcap *a)
840 {
841 struct soc_camera_device *icd = file->private_data;
842 struct soc_camera_host *ici = to_soc_camera_host(icd->parent);
843
844 return ici->ops->cropcap(icd, a);
845 }
846
847 static int soc_camera_g_crop(struct file *file, void *fh,
848 struct v4l2_crop *a)
849 {
850 struct soc_camera_device *icd = file->private_data;
851 struct soc_camera_host *ici = to_soc_camera_host(icd->parent);
852 int ret;
853
854 ret = ici->ops->get_crop(icd, a);
855
856 return ret;
857 }
858
859 /*
860 * According to the V4L2 API, drivers shall not update the struct v4l2_crop
861 * argument with the actual geometry, instead, the user shall use G_CROP to
862 * retrieve it.
863 */
864 static int soc_camera_s_crop(struct file *file, void *fh,
865 struct v4l2_crop *a)
866 {
867 struct soc_camera_device *icd = file->private_data;
868 struct soc_camera_host *ici = to_soc_camera_host(icd->parent);
869 struct v4l2_rect *rect = &a->c;
870 struct v4l2_crop current_crop;
871 int ret;
872
873 if (a->type != V4L2_BUF_TYPE_VIDEO_CAPTURE)
874 return -EINVAL;
875
876 dev_dbg(icd->pdev, "S_CROP(%ux%u@%u:%u)\n",
877 rect->width, rect->height, rect->left, rect->top);
878
879 /* If get_crop fails, we'll let host and / or client drivers decide */
880 ret = ici->ops->get_crop(icd, &current_crop);
881
882 /* Prohibit window size change with initialised buffers */
883 if (ret < 0) {
884 dev_err(icd->pdev,
885 "S_CROP denied: getting current crop failed\n");
886 } else if ((a->c.width == current_crop.c.width &&
887 a->c.height == current_crop.c.height) ||
888 !is_streaming(ici, icd)) {
889 /* same size or not streaming - use .set_crop() */
890 ret = ici->ops->set_crop(icd, a);
891 } else if (ici->ops->set_livecrop) {
892 ret = ici->ops->set_livecrop(icd, a);
893 } else {
894 dev_err(icd->pdev,
895 "S_CROP denied: queue initialised and sizes differ\n");
896 ret = -EBUSY;
897 }
898
899 return ret;
900 }
901
902 static int soc_camera_g_parm(struct file *file, void *fh,
903 struct v4l2_streamparm *a)
904 {
905 struct soc_camera_device *icd = file->private_data;
906 struct soc_camera_host *ici = to_soc_camera_host(icd->parent);
907
908 if (ici->ops->get_parm)
909 return ici->ops->get_parm(icd, a);
910
911 return -ENOIOCTLCMD;
912 }
913
914 static int soc_camera_s_parm(struct file *file, void *fh,
915 struct v4l2_streamparm *a)
916 {
917 struct soc_camera_device *icd = file->private_data;
918 struct soc_camera_host *ici = to_soc_camera_host(icd->parent);
919
920 if (ici->ops->set_parm)
921 return ici->ops->set_parm(icd, a);
922
923 return -ENOIOCTLCMD;
924 }
925
926 static int soc_camera_g_chip_ident(struct file *file, void *fh,
927 struct v4l2_dbg_chip_ident *id)
928 {
929 struct soc_camera_device *icd = file->private_data;
930 struct v4l2_subdev *sd = soc_camera_to_subdev(icd);
931
932 return v4l2_subdev_call(sd, core, g_chip_ident, id);
933 }
934
935 #ifdef CONFIG_VIDEO_ADV_DEBUG
936 static int soc_camera_g_register(struct file *file, void *fh,
937 struct v4l2_dbg_register *reg)
938 {
939 struct soc_camera_device *icd = file->private_data;
940 struct v4l2_subdev *sd = soc_camera_to_subdev(icd);
941
942 return v4l2_subdev_call(sd, core, g_register, reg);
943 }
944
945 static int soc_camera_s_register(struct file *file, void *fh,
946 struct v4l2_dbg_register *reg)
947 {
948 struct soc_camera_device *icd = file->private_data;
949 struct v4l2_subdev *sd = soc_camera_to_subdev(icd);
950
951 return v4l2_subdev_call(sd, core, s_register, reg);
952 }
953 #endif
954
955 static int soc_camera_probe(struct soc_camera_device *icd);
956
957 /* So far this function cannot fail */
958 static void scan_add_host(struct soc_camera_host *ici)
959 {
960 struct soc_camera_device *icd;
961
962 mutex_lock(&ici->host_lock);
963
964 list_for_each_entry(icd, &devices, list) {
965 if (icd->iface == ici->nr) {
966 int ret;
967
968 icd->parent = ici->v4l2_dev.dev;
969 ret = soc_camera_probe(icd);
970 }
971 }
972
973 mutex_unlock(&ici->host_lock);
974 }
975
976 #ifdef CONFIG_I2C_BOARDINFO
977 static int soc_camera_init_i2c(struct soc_camera_device *icd,
978 struct soc_camera_link *icl)
979 {
980 struct i2c_client *client;
981 struct soc_camera_host *ici = to_soc_camera_host(icd->parent);
982 struct i2c_adapter *adap = i2c_get_adapter(icl->i2c_adapter_id);
983 struct v4l2_subdev *subdev;
984
985 if (!adap) {
986 dev_err(icd->pdev, "Cannot get I2C adapter #%d. No driver?\n",
987 icl->i2c_adapter_id);
988 goto ei2cga;
989 }
990
991 icl->board_info->platform_data = icl;
992
993 subdev = v4l2_i2c_new_subdev_board(&ici->v4l2_dev, adap,
994 icl->board_info, NULL);
995 if (!subdev)
996 goto ei2cnd;
997
998 client = v4l2_get_subdevdata(subdev);
999
1000 /* Use to_i2c_client(dev) to recover the i2c client */
1001 icd->control = &client->dev;
1002
1003 return 0;
1004 ei2cnd:
1005 i2c_put_adapter(adap);
1006 ei2cga:
1007 return -ENODEV;
1008 }
1009
1010 static void soc_camera_free_i2c(struct soc_camera_device *icd)
1011 {
1012 struct i2c_client *client =
1013 to_i2c_client(to_soc_camera_control(icd));
1014 struct i2c_adapter *adap = client->adapter;
1015
1016 icd->control = NULL;
1017 v4l2_device_unregister_subdev(i2c_get_clientdata(client));
1018 i2c_unregister_device(client);
1019 i2c_put_adapter(adap);
1020 }
1021 #else
1022 #define soc_camera_init_i2c(icd, icl) (-ENODEV)
1023 #define soc_camera_free_i2c(icd) do {} while (0)
1024 #endif
1025
1026 static int soc_camera_video_start(struct soc_camera_device *icd);
1027 static int video_dev_create(struct soc_camera_device *icd);
1028 /* Called during host-driver probe */
1029 static int soc_camera_probe(struct soc_camera_device *icd)
1030 {
1031 struct soc_camera_host *ici = to_soc_camera_host(icd->parent);
1032 struct soc_camera_link *icl = to_soc_camera_link(icd);
1033 struct device *control = NULL;
1034 struct v4l2_subdev *sd;
1035 struct v4l2_mbus_framefmt mf;
1036 int ret;
1037
1038 dev_info(icd->pdev, "Probing %s\n", dev_name(icd->pdev));
1039
1040 /*
1041 * Currently the subdev with the largest number of controls (13) is
1042 * ov6550. So let's pick 16 as a hint for the control handler. Note
1043 * that this is a hint only: too large and you waste some memory, too
1044 * small and there is a (very) small performance hit when looking up
1045 * controls in the internal hash.
1046 */
1047 ret = v4l2_ctrl_handler_init(&icd->ctrl_handler, 16);
1048 if (ret < 0)
1049 return ret;
1050
1051 ret = regulator_bulk_get(icd->pdev, icl->num_regulators,
1052 icl->regulators);
1053 if (ret < 0)
1054 goto ereg;
1055
1056 /* The camera could have been already on, try to reset */
1057 if (icl->reset)
1058 icl->reset(icd->pdev);
1059
1060 ret = ici->ops->add(icd);
1061 if (ret < 0)
1062 goto eadd;
1063
1064 /*
1065 * This will not yet call v4l2_subdev_core_ops::s_power(1), because the
1066 * subdevice has not been initialised yet. We'll have to call it once
1067 * again after initialisation, even though it shouldn't be needed, we
1068 * don't do any IO here.
1069 */
1070 ret = soc_camera_power_on(icd, icl);
1071 if (ret < 0)
1072 goto epower;
1073
1074 /* Must have icd->vdev before registering the device */
1075 ret = video_dev_create(icd);
1076 if (ret < 0)
1077 goto evdc;
1078
1079 /* Non-i2c cameras, e.g., soc_camera_platform, have no board_info */
1080 if (icl->board_info) {
1081 ret = soc_camera_init_i2c(icd, icl);
1082 if (ret < 0)
1083 goto eadddev;
1084 } else if (!icl->add_device || !icl->del_device) {
1085 ret = -EINVAL;
1086 goto eadddev;
1087 } else {
1088 if (icl->module_name)
1089 ret = request_module(icl->module_name);
1090
1091 ret = icl->add_device(icd);
1092 if (ret < 0)
1093 goto eadddev;
1094
1095 /*
1096 * FIXME: this is racy, have to use driver-binding notification,
1097 * when it is available
1098 */
1099 control = to_soc_camera_control(icd);
1100 if (!control || !control->driver || !dev_get_drvdata(control) ||
1101 !try_module_get(control->driver->owner)) {
1102 icl->del_device(icd);
1103 ret = -ENODEV;
1104 goto enodrv;
1105 }
1106 }
1107
1108 sd = soc_camera_to_subdev(icd);
1109 sd->grp_id = soc_camera_grp_id(icd);
1110 v4l2_set_subdev_hostdata(sd, icd);
1111
1112 if (v4l2_ctrl_add_handler(&icd->ctrl_handler, sd->ctrl_handler))
1113 goto ectrl;
1114
1115 /* At this point client .probe() should have run already */
1116 ret = soc_camera_init_user_formats(icd);
1117 if (ret < 0)
1118 goto eiufmt;
1119
1120 icd->field = V4L2_FIELD_ANY;
1121
1122 /*
1123 * ..._video_start() will create a device node, video_register_device()
1124 * itself is protected against concurrent open() calls, but we also have
1125 * to protect our data.
1126 */
1127 mutex_lock(&icd->video_lock);
1128
1129 ret = soc_camera_video_start(icd);
1130 if (ret < 0)
1131 goto evidstart;
1132
1133 ret = v4l2_subdev_call(sd, core, s_power, 1);
1134 if (ret < 0 && ret != -ENOIOCTLCMD)
1135 goto esdpwr;
1136
1137 /* Try to improve our guess of a reasonable window format */
1138 if (!v4l2_subdev_call(sd, video, g_mbus_fmt, &mf)) {
1139 icd->user_width = mf.width;
1140 icd->user_height = mf.height;
1141 icd->colorspace = mf.colorspace;
1142 icd->field = mf.field;
1143 }
1144
1145 ici->ops->remove(icd);
1146
1147 soc_camera_power_off(icd, icl);
1148
1149 mutex_unlock(&icd->video_lock);
1150
1151 return 0;
1152
1153 esdpwr:
1154 video_unregister_device(icd->vdev);
1155 evidstart:
1156 mutex_unlock(&icd->video_lock);
1157 soc_camera_free_user_formats(icd);
1158 eiufmt:
1159 ectrl:
1160 if (icl->board_info) {
1161 soc_camera_free_i2c(icd);
1162 } else {
1163 icl->del_device(icd);
1164 module_put(control->driver->owner);
1165 }
1166 enodrv:
1167 eadddev:
1168 video_device_release(icd->vdev);
1169 icd->vdev = NULL;
1170 evdc:
1171 soc_camera_power_off(icd, icl);
1172 epower:
1173 ici->ops->remove(icd);
1174 eadd:
1175 regulator_bulk_free(icl->num_regulators, icl->regulators);
1176 ereg:
1177 v4l2_ctrl_handler_free(&icd->ctrl_handler);
1178 return ret;
1179 }
1180
1181 /*
1182 * This is called on device_unregister, which only means we have to disconnect
1183 * from the host, but not remove ourselves from the device list
1184 */
1185 static int soc_camera_remove(struct soc_camera_device *icd)
1186 {
1187 struct soc_camera_link *icl = to_soc_camera_link(icd);
1188 struct video_device *vdev = icd->vdev;
1189
1190 BUG_ON(!icd->parent);
1191
1192 v4l2_ctrl_handler_free(&icd->ctrl_handler);
1193 if (vdev) {
1194 video_unregister_device(vdev);
1195 icd->vdev = NULL;
1196 }
1197
1198 if (icl->board_info) {
1199 soc_camera_free_i2c(icd);
1200 } else {
1201 struct device_driver *drv = to_soc_camera_control(icd)->driver;
1202 if (drv) {
1203 icl->del_device(icd);
1204 module_put(drv->owner);
1205 }
1206 }
1207 soc_camera_free_user_formats(icd);
1208
1209 regulator_bulk_free(icl->num_regulators, icl->regulators);
1210
1211 return 0;
1212 }
1213
1214 static int default_cropcap(struct soc_camera_device *icd,
1215 struct v4l2_cropcap *a)
1216 {
1217 struct v4l2_subdev *sd = soc_camera_to_subdev(icd);
1218 return v4l2_subdev_call(sd, video, cropcap, a);
1219 }
1220
1221 static int default_g_crop(struct soc_camera_device *icd, struct v4l2_crop *a)
1222 {
1223 struct v4l2_subdev *sd = soc_camera_to_subdev(icd);
1224 return v4l2_subdev_call(sd, video, g_crop, a);
1225 }
1226
1227 static int default_s_crop(struct soc_camera_device *icd, struct v4l2_crop *a)
1228 {
1229 struct v4l2_subdev *sd = soc_camera_to_subdev(icd);
1230 return v4l2_subdev_call(sd, video, s_crop, a);
1231 }
1232
1233 static int default_g_parm(struct soc_camera_device *icd,
1234 struct v4l2_streamparm *parm)
1235 {
1236 struct v4l2_subdev *sd = soc_camera_to_subdev(icd);
1237 return v4l2_subdev_call(sd, video, g_parm, parm);
1238 }
1239
1240 static int default_s_parm(struct soc_camera_device *icd,
1241 struct v4l2_streamparm *parm)
1242 {
1243 struct v4l2_subdev *sd = soc_camera_to_subdev(icd);
1244 return v4l2_subdev_call(sd, video, s_parm, parm);
1245 }
1246
1247 static int default_enum_framesizes(struct soc_camera_device *icd,
1248 struct v4l2_frmsizeenum *fsize)
1249 {
1250 int ret;
1251 struct v4l2_subdev *sd = soc_camera_to_subdev(icd);
1252 const struct soc_camera_format_xlate *xlate;
1253 __u32 pixfmt = fsize->pixel_format;
1254 struct v4l2_frmsizeenum fsize_mbus = *fsize;
1255
1256 xlate = soc_camera_xlate_by_fourcc(icd, pixfmt);
1257 if (!xlate)
1258 return -EINVAL;
1259 /* map xlate-code to pixel_format, sensor only handle xlate-code*/
1260 fsize_mbus.pixel_format = xlate->code;
1261
1262 ret = v4l2_subdev_call(sd, video, enum_mbus_fsizes, &fsize_mbus);
1263 if (ret < 0)
1264 return ret;
1265
1266 *fsize = fsize_mbus;
1267 fsize->pixel_format = pixfmt;
1268
1269 return 0;
1270 }
1271
1272 int soc_camera_host_register(struct soc_camera_host *ici)
1273 {
1274 struct soc_camera_host *ix;
1275 int ret;
1276
1277 if (!ici || !ici->ops ||
1278 !ici->ops->try_fmt ||
1279 !ici->ops->set_fmt ||
1280 !ici->ops->set_bus_param ||
1281 !ici->ops->querycap ||
1282 ((!ici->ops->init_videobuf ||
1283 !ici->ops->reqbufs) &&
1284 !ici->ops->init_videobuf2) ||
1285 !ici->ops->add ||
1286 !ici->ops->remove ||
1287 !ici->ops->poll ||
1288 !ici->v4l2_dev.dev)
1289 return -EINVAL;
1290
1291 if (!ici->ops->set_crop)
1292 ici->ops->set_crop = default_s_crop;
1293 if (!ici->ops->get_crop)
1294 ici->ops->get_crop = default_g_crop;
1295 if (!ici->ops->cropcap)
1296 ici->ops->cropcap = default_cropcap;
1297 if (!ici->ops->set_parm)
1298 ici->ops->set_parm = default_s_parm;
1299 if (!ici->ops->get_parm)
1300 ici->ops->get_parm = default_g_parm;
1301 if (!ici->ops->enum_framesizes)
1302 ici->ops->enum_framesizes = default_enum_framesizes;
1303
1304 mutex_lock(&list_lock);
1305 list_for_each_entry(ix, &hosts, list) {
1306 if (ix->nr == ici->nr) {
1307 ret = -EBUSY;
1308 goto edevreg;
1309 }
1310 }
1311
1312 ret = v4l2_device_register(ici->v4l2_dev.dev, &ici->v4l2_dev);
1313 if (ret < 0)
1314 goto edevreg;
1315
1316 list_add_tail(&ici->list, &hosts);
1317 mutex_unlock(&list_lock);
1318
1319 mutex_init(&ici->host_lock);
1320 scan_add_host(ici);
1321
1322 return 0;
1323
1324 edevreg:
1325 mutex_unlock(&list_lock);
1326 return ret;
1327 }
1328 EXPORT_SYMBOL(soc_camera_host_register);
1329
1330 /* Unregister all clients! */
1331 void soc_camera_host_unregister(struct soc_camera_host *ici)
1332 {
1333 struct soc_camera_device *icd;
1334
1335 mutex_lock(&list_lock);
1336
1337 list_del(&ici->list);
1338 list_for_each_entry(icd, &devices, list)
1339 if (icd->iface == ici->nr && to_soc_camera_control(icd))
1340 soc_camera_remove(icd);
1341
1342 mutex_unlock(&list_lock);
1343
1344 v4l2_device_unregister(&ici->v4l2_dev);
1345 }
1346 EXPORT_SYMBOL(soc_camera_host_unregister);
1347
1348 /* Image capture device */
1349 static int soc_camera_device_register(struct soc_camera_device *icd)
1350 {
1351 struct soc_camera_device *ix;
1352 int num = -1, i;
1353
1354 for (i = 0; i < 256 && num < 0; i++) {
1355 num = i;
1356 /* Check if this index is available on this interface */
1357 list_for_each_entry(ix, &devices, list) {
1358 if (ix->iface == icd->iface && ix->devnum == i) {
1359 num = -1;
1360 break;
1361 }
1362 }
1363 }
1364
1365 if (num < 0)
1366 /*
1367 * ok, we have 256 cameras on this host...
1368 * man, stay reasonable...
1369 */
1370 return -ENOMEM;
1371
1372 icd->devnum = num;
1373 icd->use_count = 0;
1374 icd->host_priv = NULL;
1375 mutex_init(&icd->video_lock);
1376
1377 list_add_tail(&icd->list, &devices);
1378
1379 return 0;
1380 }
1381
1382 static const struct v4l2_ioctl_ops soc_camera_ioctl_ops = {
1383 .vidioc_querycap = soc_camera_querycap,
1384 .vidioc_try_fmt_vid_cap = soc_camera_try_fmt_vid_cap,
1385 .vidioc_g_fmt_vid_cap = soc_camera_g_fmt_vid_cap,
1386 .vidioc_s_fmt_vid_cap = soc_camera_s_fmt_vid_cap,
1387 .vidioc_enum_fmt_vid_cap = soc_camera_enum_fmt_vid_cap,
1388 .vidioc_enum_input = soc_camera_enum_input,
1389 .vidioc_g_input = soc_camera_g_input,
1390 .vidioc_s_input = soc_camera_s_input,
1391 .vidioc_s_std = soc_camera_s_std,
1392 .vidioc_g_std = soc_camera_g_std,
1393 .vidioc_enum_framesizes = soc_camera_enum_framesizes,
1394 .vidioc_reqbufs = soc_camera_reqbufs,
1395 .vidioc_querybuf = soc_camera_querybuf,
1396 .vidioc_qbuf = soc_camera_qbuf,
1397 .vidioc_dqbuf = soc_camera_dqbuf,
1398 .vidioc_create_bufs = soc_camera_create_bufs,
1399 .vidioc_prepare_buf = soc_camera_prepare_buf,
1400 .vidioc_streamon = soc_camera_streamon,
1401 .vidioc_streamoff = soc_camera_streamoff,
1402 .vidioc_cropcap = soc_camera_cropcap,
1403 .vidioc_g_crop = soc_camera_g_crop,
1404 .vidioc_s_crop = soc_camera_s_crop,
1405 .vidioc_g_parm = soc_camera_g_parm,
1406 .vidioc_s_parm = soc_camera_s_parm,
1407 .vidioc_g_chip_ident = soc_camera_g_chip_ident,
1408 #ifdef CONFIG_VIDEO_ADV_DEBUG
1409 .vidioc_g_register = soc_camera_g_register,
1410 .vidioc_s_register = soc_camera_s_register,
1411 #endif
1412 };
1413
1414 static int video_dev_create(struct soc_camera_device *icd)
1415 {
1416 struct soc_camera_host *ici = to_soc_camera_host(icd->parent);
1417 struct video_device *vdev = video_device_alloc();
1418
1419 if (!vdev)
1420 return -ENOMEM;
1421
1422 strlcpy(vdev->name, ici->drv_name, sizeof(vdev->name));
1423
1424 vdev->parent = icd->pdev;
1425 vdev->current_norm = V4L2_STD_UNKNOWN;
1426 vdev->fops = &soc_camera_fops;
1427 vdev->ioctl_ops = &soc_camera_ioctl_ops;
1428 vdev->release = video_device_release;
1429 vdev->tvnorms = V4L2_STD_UNKNOWN;
1430 vdev->ctrl_handler = &icd->ctrl_handler;
1431 vdev->lock = &icd->video_lock;
1432 /* Locking in file operations other than ioctl should be done
1433 by the driver, not the V4L2 core.
1434 This driver needs auditing so that this flag can be removed. */
1435 set_bit(V4L2_FL_LOCK_ALL_FOPS, &vdev->flags);
1436
1437 icd->vdev = vdev;
1438
1439 return 0;
1440 }
1441
1442 /*
1443 * Called from soc_camera_probe() above (with .video_lock held???)
1444 */
1445 static int soc_camera_video_start(struct soc_camera_device *icd)
1446 {
1447 const struct device_type *type = icd->vdev->dev.type;
1448 int ret;
1449
1450 if (!icd->parent)
1451 return -ENODEV;
1452
1453 ret = video_register_device(icd->vdev, VFL_TYPE_GRABBER, -1);
1454 if (ret < 0) {
1455 dev_err(icd->pdev, "video_register_device failed: %d\n", ret);
1456 return ret;
1457 }
1458
1459 /* Restore device type, possibly set by the subdevice driver */
1460 icd->vdev->dev.type = type;
1461
1462 return 0;
1463 }
1464
1465 static int __devinit soc_camera_pdrv_probe(struct platform_device *pdev)
1466 {
1467 struct soc_camera_link *icl = pdev->dev.platform_data;
1468 struct soc_camera_device *icd;
1469 int ret;
1470
1471 if (!icl)
1472 return -EINVAL;
1473
1474 icd = kzalloc(sizeof(*icd), GFP_KERNEL);
1475 if (!icd)
1476 return -ENOMEM;
1477
1478 icd->iface = icl->bus_id;
1479 icd->link = icl;
1480 icd->pdev = &pdev->dev;
1481 platform_set_drvdata(pdev, icd);
1482
1483 ret = soc_camera_device_register(icd);
1484 if (ret < 0)
1485 goto escdevreg;
1486
1487 icd->user_width = DEFAULT_WIDTH;
1488 icd->user_height = DEFAULT_HEIGHT;
1489
1490 return 0;
1491
1492 escdevreg:
1493 kfree(icd);
1494
1495 return ret;
1496 }
1497
1498 /*
1499 * Only called on rmmod for each platform device, since they are not
1500 * hot-pluggable. Now we know, that all our users - hosts and devices have
1501 * been unloaded already
1502 */
1503 static int __devexit soc_camera_pdrv_remove(struct platform_device *pdev)
1504 {
1505 struct soc_camera_device *icd = platform_get_drvdata(pdev);
1506
1507 if (!icd)
1508 return -EINVAL;
1509
1510 list_del(&icd->list);
1511
1512 kfree(icd);
1513
1514 return 0;
1515 }
1516
1517 static struct platform_driver __refdata soc_camera_pdrv = {
1518 .remove = __devexit_p(soc_camera_pdrv_remove),
1519 .driver = {
1520 .name = "soc-camera-pdrv",
1521 .owner = THIS_MODULE,
1522 },
1523 };
1524
1525 static int __init soc_camera_init(void)
1526 {
1527 return platform_driver_probe(&soc_camera_pdrv, soc_camera_pdrv_probe);
1528 }
1529
1530 static void __exit soc_camera_exit(void)
1531 {
1532 platform_driver_unregister(&soc_camera_pdrv);
1533 }
1534
1535 module_init(soc_camera_init);
1536 module_exit(soc_camera_exit);
1537
1538 MODULE_DESCRIPTION("Image capture bus driver");
1539 MODULE_AUTHOR("Guennadi Liakhovetski <kernel@pengutronix.de>");
1540 MODULE_LICENSE("GPL");
1541 MODULE_ALIAS("platform:soc-camera-pdrv");
Linux kernel - Deliverables
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