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[media] v4l2: add const to argument of write-only s_register ioctl
[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_subdev_desc *ssdd)
54 {
55 int ret = regulator_bulk_enable(ssdd->num_regulators,
56 ssdd->regulators);
57 if (ret < 0) {
58 dev_err(dev, "Cannot enable regulators\n");
59 return ret;
60 }
61
62 if (ssdd->power) {
63 ret = ssdd->power(dev, 1);
64 if (ret < 0) {
65 dev_err(dev,
66 "Platform failed to power-on the camera.\n");
67 regulator_bulk_disable(ssdd->num_regulators,
68 ssdd->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_subdev_desc *ssdd)
77 {
78 int ret = 0;
79 int err;
80
81 if (ssdd->power) {
82 err = ssdd->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(ssdd->num_regulators,
91 ssdd->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 * @ssdd: camera platform parameters
140 * @cfg: media bus configuration
141 * @return: resulting flags
142 */
143 unsigned long soc_camera_apply_board_flags(struct soc_camera_subdev_desc *ssdd,
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 (ssdd->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 (ssdd->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 (ssdd->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 .host_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 .host_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_desc *sdesc = to_soc_camera_desc(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 /*
521 * Don't mess with the host during probe: wait until the loop in
522 * scan_add_host() completes
523 */
524 if (mutex_lock_interruptible(&list_lock))
525 return -ERESTARTSYS;
526 ici = to_soc_camera_host(icd->parent);
527 mutex_unlock(&list_lock);
528
529 if (mutex_lock_interruptible(&ici->host_lock))
530 return -ERESTARTSYS;
531 if (!try_module_get(ici->ops->owner)) {
532 dev_err(icd->pdev, "Couldn't lock capture bus driver.\n");
533 ret = -EINVAL;
534 goto emodule;
535 }
536
537 icd->use_count++;
538
539 /* Now we really have to activate the camera */
540 if (icd->use_count == 1) {
541 /* Restore parameters before the last close() per V4L2 API */
542 struct v4l2_format f = {
543 .type = V4L2_BUF_TYPE_VIDEO_CAPTURE,
544 .fmt.pix = {
545 .width = icd->user_width,
546 .height = icd->user_height,
547 .field = icd->field,
548 .colorspace = icd->colorspace,
549 .pixelformat =
550 icd->current_fmt->host_fmt->fourcc,
551 },
552 };
553
554 /* The camera could have been already on, try to reset */
555 if (sdesc->subdev_desc.reset)
556 sdesc->subdev_desc.reset(icd->pdev);
557
558 ret = ici->ops->add(icd);
559 if (ret < 0) {
560 dev_err(icd->pdev, "Couldn't activate the camera: %d\n", ret);
561 goto eiciadd;
562 }
563
564 ret = __soc_camera_power_on(icd);
565 if (ret < 0)
566 goto epower;
567
568 pm_runtime_enable(&icd->vdev->dev);
569 ret = pm_runtime_resume(&icd->vdev->dev);
570 if (ret < 0 && ret != -ENOSYS)
571 goto eresume;
572
573 /*
574 * Try to configure with default parameters. Notice: this is the
575 * very first open, so, we cannot race against other calls,
576 * apart from someone else calling open() simultaneously, but
577 * .host_lock is protecting us against it.
578 */
579 ret = soc_camera_set_fmt(icd, &f);
580 if (ret < 0)
581 goto esfmt;
582
583 if (ici->ops->init_videobuf) {
584 ici->ops->init_videobuf(&icd->vb_vidq, icd);
585 } else {
586 ret = ici->ops->init_videobuf2(&icd->vb2_vidq, icd);
587 if (ret < 0)
588 goto einitvb;
589 }
590 v4l2_ctrl_handler_setup(&icd->ctrl_handler);
591 }
592 mutex_unlock(&ici->host_lock);
593
594 file->private_data = icd;
595 dev_dbg(icd->pdev, "camera device open\n");
596
597 return 0;
598
599 /*
600 * First four errors are entered with the .host_lock held
601 * and use_count == 1
602 */
603 einitvb:
604 esfmt:
605 pm_runtime_disable(&icd->vdev->dev);
606 eresume:
607 __soc_camera_power_off(icd);
608 epower:
609 ici->ops->remove(icd);
610 eiciadd:
611 icd->use_count--;
612 module_put(ici->ops->owner);
613 emodule:
614 mutex_unlock(&ici->host_lock);
615
616 return ret;
617 }
618
619 static int soc_camera_close(struct file *file)
620 {
621 struct soc_camera_device *icd = file->private_data;
622 struct soc_camera_host *ici = to_soc_camera_host(icd->parent);
623
624 mutex_lock(&ici->host_lock);
625 icd->use_count--;
626 if (!icd->use_count) {
627 pm_runtime_suspend(&icd->vdev->dev);
628 pm_runtime_disable(&icd->vdev->dev);
629
630 if (ici->ops->init_videobuf2)
631 vb2_queue_release(&icd->vb2_vidq);
632 ici->ops->remove(icd);
633
634 __soc_camera_power_off(icd);
635 }
636
637 if (icd->streamer == file)
638 icd->streamer = NULL;
639 mutex_unlock(&ici->host_lock);
640
641 module_put(ici->ops->owner);
642
643 dev_dbg(icd->pdev, "camera device close\n");
644
645 return 0;
646 }
647
648 static ssize_t soc_camera_read(struct file *file, char __user *buf,
649 size_t count, loff_t *ppos)
650 {
651 struct soc_camera_device *icd = file->private_data;
652 struct soc_camera_host *ici = to_soc_camera_host(icd->parent);
653
654 dev_dbg(icd->pdev, "read called, buf %p\n", buf);
655
656 if (ici->ops->init_videobuf2 && icd->vb2_vidq.io_modes & VB2_READ)
657 return vb2_read(&icd->vb2_vidq, buf, count, ppos,
658 file->f_flags & O_NONBLOCK);
659
660 dev_err(icd->pdev, "camera device read not implemented\n");
661
662 return -EINVAL;
663 }
664
665 static int soc_camera_mmap(struct file *file, struct vm_area_struct *vma)
666 {
667 struct soc_camera_device *icd = file->private_data;
668 struct soc_camera_host *ici = to_soc_camera_host(icd->parent);
669 int err;
670
671 dev_dbg(icd->pdev, "mmap called, vma=0x%08lx\n", (unsigned long)vma);
672
673 if (icd->streamer != file)
674 return -EBUSY;
675
676 if (mutex_lock_interruptible(&ici->host_lock))
677 return -ERESTARTSYS;
678 if (ici->ops->init_videobuf)
679 err = videobuf_mmap_mapper(&icd->vb_vidq, vma);
680 else
681 err = vb2_mmap(&icd->vb2_vidq, vma);
682 mutex_unlock(&ici->host_lock);
683
684 dev_dbg(icd->pdev, "vma start=0x%08lx, size=%ld, ret=%d\n",
685 (unsigned long)vma->vm_start,
686 (unsigned long)vma->vm_end - (unsigned long)vma->vm_start,
687 err);
688
689 return err;
690 }
691
692 static unsigned int soc_camera_poll(struct file *file, poll_table *pt)
693 {
694 struct soc_camera_device *icd = file->private_data;
695 struct soc_camera_host *ici = to_soc_camera_host(icd->parent);
696 unsigned res = POLLERR;
697
698 if (icd->streamer != file)
699 return POLLERR;
700
701 mutex_lock(&ici->host_lock);
702 if (ici->ops->init_videobuf && list_empty(&icd->vb_vidq.stream))
703 dev_err(icd->pdev, "Trying to poll with no queued buffers!\n");
704 else
705 res = ici->ops->poll(file, pt);
706 mutex_unlock(&ici->host_lock);
707 return res;
708 }
709
710 void soc_camera_lock(struct vb2_queue *vq)
711 {
712 struct soc_camera_device *icd = vb2_get_drv_priv(vq);
713 struct soc_camera_host *ici = to_soc_camera_host(icd->parent);
714 mutex_lock(&ici->host_lock);
715 }
716 EXPORT_SYMBOL(soc_camera_lock);
717
718 void soc_camera_unlock(struct vb2_queue *vq)
719 {
720 struct soc_camera_device *icd = vb2_get_drv_priv(vq);
721 struct soc_camera_host *ici = to_soc_camera_host(icd->parent);
722 mutex_unlock(&ici->host_lock);
723 }
724 EXPORT_SYMBOL(soc_camera_unlock);
725
726 static struct v4l2_file_operations soc_camera_fops = {
727 .owner = THIS_MODULE,
728 .open = soc_camera_open,
729 .release = soc_camera_close,
730 .unlocked_ioctl = video_ioctl2,
731 .read = soc_camera_read,
732 .mmap = soc_camera_mmap,
733 .poll = soc_camera_poll,
734 };
735
736 static int soc_camera_s_fmt_vid_cap(struct file *file, void *priv,
737 struct v4l2_format *f)
738 {
739 struct soc_camera_device *icd = file->private_data;
740 int ret;
741
742 WARN_ON(priv != file->private_data);
743
744 if (f->type != V4L2_BUF_TYPE_VIDEO_CAPTURE) {
745 dev_warn(icd->pdev, "Wrong buf-type %d\n", f->type);
746 return -EINVAL;
747 }
748
749 if (icd->streamer && icd->streamer != file)
750 return -EBUSY;
751
752 if (is_streaming(to_soc_camera_host(icd->parent), icd)) {
753 dev_err(icd->pdev, "S_FMT denied: queue initialised\n");
754 return -EBUSY;
755 }
756
757 ret = soc_camera_set_fmt(icd, f);
758
759 if (!ret && !icd->streamer)
760 icd->streamer = file;
761
762 return ret;
763 }
764
765 static int soc_camera_enum_fmt_vid_cap(struct file *file, void *priv,
766 struct v4l2_fmtdesc *f)
767 {
768 struct soc_camera_device *icd = file->private_data;
769 const struct soc_mbus_pixelfmt *format;
770
771 WARN_ON(priv != file->private_data);
772
773 if (f->index >= icd->num_user_formats)
774 return -EINVAL;
775
776 format = icd->user_formats[f->index].host_fmt;
777
778 if (format->name)
779 strlcpy(f->description, format->name, sizeof(f->description));
780 f->pixelformat = format->fourcc;
781 return 0;
782 }
783
784 static int soc_camera_g_fmt_vid_cap(struct file *file, void *priv,
785 struct v4l2_format *f)
786 {
787 struct soc_camera_device *icd = file->private_data;
788 struct v4l2_pix_format *pix = &f->fmt.pix;
789
790 WARN_ON(priv != file->private_data);
791
792 if (f->type != V4L2_BUF_TYPE_VIDEO_CAPTURE)
793 return -EINVAL;
794
795 pix->width = icd->user_width;
796 pix->height = icd->user_height;
797 pix->bytesperline = icd->bytesperline;
798 pix->sizeimage = icd->sizeimage;
799 pix->field = icd->field;
800 pix->pixelformat = icd->current_fmt->host_fmt->fourcc;
801 pix->colorspace = icd->colorspace;
802 dev_dbg(icd->pdev, "current_fmt->fourcc: 0x%08x\n",
803 icd->current_fmt->host_fmt->fourcc);
804 return 0;
805 }
806
807 static int soc_camera_querycap(struct file *file, void *priv,
808 struct v4l2_capability *cap)
809 {
810 struct soc_camera_device *icd = file->private_data;
811 struct soc_camera_host *ici = to_soc_camera_host(icd->parent);
812
813 WARN_ON(priv != file->private_data);
814
815 strlcpy(cap->driver, ici->drv_name, sizeof(cap->driver));
816 return ici->ops->querycap(ici, cap);
817 }
818
819 static int soc_camera_streamon(struct file *file, void *priv,
820 enum v4l2_buf_type i)
821 {
822 struct soc_camera_device *icd = file->private_data;
823 struct soc_camera_host *ici = to_soc_camera_host(icd->parent);
824 struct v4l2_subdev *sd = soc_camera_to_subdev(icd);
825 int ret;
826
827 WARN_ON(priv != file->private_data);
828
829 if (i != V4L2_BUF_TYPE_VIDEO_CAPTURE)
830 return -EINVAL;
831
832 if (icd->streamer != file)
833 return -EBUSY;
834
835 /* This calls buf_queue from host driver's videobuf_queue_ops */
836 if (ici->ops->init_videobuf)
837 ret = videobuf_streamon(&icd->vb_vidq);
838 else
839 ret = vb2_streamon(&icd->vb2_vidq, i);
840
841 if (!ret)
842 v4l2_subdev_call(sd, video, s_stream, 1);
843
844 return ret;
845 }
846
847 static int soc_camera_streamoff(struct file *file, void *priv,
848 enum v4l2_buf_type i)
849 {
850 struct soc_camera_device *icd = file->private_data;
851 struct v4l2_subdev *sd = soc_camera_to_subdev(icd);
852 struct soc_camera_host *ici = to_soc_camera_host(icd->parent);
853
854 WARN_ON(priv != file->private_data);
855
856 if (i != V4L2_BUF_TYPE_VIDEO_CAPTURE)
857 return -EINVAL;
858
859 if (icd->streamer != file)
860 return -EBUSY;
861
862 /*
863 * This calls buf_release from host driver's videobuf_queue_ops for all
864 * remaining buffers. When the last buffer is freed, stop capture
865 */
866 if (ici->ops->init_videobuf)
867 videobuf_streamoff(&icd->vb_vidq);
868 else
869 vb2_streamoff(&icd->vb2_vidq, i);
870
871 v4l2_subdev_call(sd, video, s_stream, 0);
872
873 return 0;
874 }
875
876 static int soc_camera_cropcap(struct file *file, void *fh,
877 struct v4l2_cropcap *a)
878 {
879 struct soc_camera_device *icd = file->private_data;
880 struct soc_camera_host *ici = to_soc_camera_host(icd->parent);
881
882 return ici->ops->cropcap(icd, a);
883 }
884
885 static int soc_camera_g_crop(struct file *file, void *fh,
886 struct v4l2_crop *a)
887 {
888 struct soc_camera_device *icd = file->private_data;
889 struct soc_camera_host *ici = to_soc_camera_host(icd->parent);
890 int ret;
891
892 ret = ici->ops->get_crop(icd, a);
893
894 return ret;
895 }
896
897 /*
898 * According to the V4L2 API, drivers shall not update the struct v4l2_crop
899 * argument with the actual geometry, instead, the user shall use G_CROP to
900 * retrieve it.
901 */
902 static int soc_camera_s_crop(struct file *file, void *fh,
903 const struct v4l2_crop *a)
904 {
905 struct soc_camera_device *icd = file->private_data;
906 struct soc_camera_host *ici = to_soc_camera_host(icd->parent);
907 const struct v4l2_rect *rect = &a->c;
908 struct v4l2_crop current_crop;
909 int ret;
910
911 if (a->type != V4L2_BUF_TYPE_VIDEO_CAPTURE)
912 return -EINVAL;
913
914 dev_dbg(icd->pdev, "S_CROP(%ux%u@%u:%u)\n",
915 rect->width, rect->height, rect->left, rect->top);
916
917 current_crop.type = a->type;
918
919 /* If get_crop fails, we'll let host and / or client drivers decide */
920 ret = ici->ops->get_crop(icd, &current_crop);
921
922 /* Prohibit window size change with initialised buffers */
923 if (ret < 0) {
924 dev_err(icd->pdev,
925 "S_CROP denied: getting current crop failed\n");
926 } else if ((a->c.width == current_crop.c.width &&
927 a->c.height == current_crop.c.height) ||
928 !is_streaming(ici, icd)) {
929 /* same size or not streaming - use .set_crop() */
930 ret = ici->ops->set_crop(icd, a);
931 } else if (ici->ops->set_livecrop) {
932 ret = ici->ops->set_livecrop(icd, a);
933 } else {
934 dev_err(icd->pdev,
935 "S_CROP denied: queue initialised and sizes differ\n");
936 ret = -EBUSY;
937 }
938
939 return ret;
940 }
941
942 static int soc_camera_g_selection(struct file *file, void *fh,
943 struct v4l2_selection *s)
944 {
945 struct soc_camera_device *icd = file->private_data;
946 struct soc_camera_host *ici = to_soc_camera_host(icd->parent);
947
948 /* With a wrong type no need to try to fall back to cropping */
949 if (s->type != V4L2_BUF_TYPE_VIDEO_CAPTURE)
950 return -EINVAL;
951
952 if (!ici->ops->get_selection)
953 return -ENOTTY;
954
955 return ici->ops->get_selection(icd, s);
956 }
957
958 static int soc_camera_s_selection(struct file *file, void *fh,
959 struct v4l2_selection *s)
960 {
961 struct soc_camera_device *icd = file->private_data;
962 struct soc_camera_host *ici = to_soc_camera_host(icd->parent);
963 int ret;
964
965 /* In all these cases cropping emulation will not help */
966 if (s->type != V4L2_BUF_TYPE_VIDEO_CAPTURE ||
967 (s->target != V4L2_SEL_TGT_COMPOSE &&
968 s->target != V4L2_SEL_TGT_CROP))
969 return -EINVAL;
970
971 if (s->target == V4L2_SEL_TGT_COMPOSE) {
972 /* No output size change during a running capture! */
973 if (is_streaming(ici, icd) &&
974 (icd->user_width != s->r.width ||
975 icd->user_height != s->r.height))
976 return -EBUSY;
977
978 /*
979 * Only one user is allowed to change the output format, touch
980 * buffers, start / stop streaming, poll for data
981 */
982 if (icd->streamer && icd->streamer != file)
983 return -EBUSY;
984 }
985
986 if (!ici->ops->set_selection)
987 return -ENOTTY;
988
989 ret = ici->ops->set_selection(icd, s);
990 if (!ret &&
991 s->target == V4L2_SEL_TGT_COMPOSE) {
992 icd->user_width = s->r.width;
993 icd->user_height = s->r.height;
994 if (!icd->streamer)
995 icd->streamer = file;
996 }
997
998 return ret;
999 }
1000
1001 static int soc_camera_g_parm(struct file *file, void *fh,
1002 struct v4l2_streamparm *a)
1003 {
1004 struct soc_camera_device *icd = file->private_data;
1005 struct soc_camera_host *ici = to_soc_camera_host(icd->parent);
1006
1007 if (ici->ops->get_parm)
1008 return ici->ops->get_parm(icd, a);
1009
1010 return -ENOIOCTLCMD;
1011 }
1012
1013 static int soc_camera_s_parm(struct file *file, void *fh,
1014 struct v4l2_streamparm *a)
1015 {
1016 struct soc_camera_device *icd = file->private_data;
1017 struct soc_camera_host *ici = to_soc_camera_host(icd->parent);
1018
1019 if (ici->ops->set_parm)
1020 return ici->ops->set_parm(icd, a);
1021
1022 return -ENOIOCTLCMD;
1023 }
1024
1025 static int soc_camera_g_chip_ident(struct file *file, void *fh,
1026 struct v4l2_dbg_chip_ident *id)
1027 {
1028 struct soc_camera_device *icd = file->private_data;
1029 struct v4l2_subdev *sd = soc_camera_to_subdev(icd);
1030
1031 return v4l2_subdev_call(sd, core, g_chip_ident, id);
1032 }
1033
1034 #ifdef CONFIG_VIDEO_ADV_DEBUG
1035 static int soc_camera_g_register(struct file *file, void *fh,
1036 struct v4l2_dbg_register *reg)
1037 {
1038 struct soc_camera_device *icd = file->private_data;
1039 struct v4l2_subdev *sd = soc_camera_to_subdev(icd);
1040
1041 return v4l2_subdev_call(sd, core, g_register, reg);
1042 }
1043
1044 static int soc_camera_s_register(struct file *file, void *fh,
1045 const struct v4l2_dbg_register *reg)
1046 {
1047 struct soc_camera_device *icd = file->private_data;
1048 struct v4l2_subdev *sd = soc_camera_to_subdev(icd);
1049
1050 return v4l2_subdev_call(sd, core, s_register, reg);
1051 }
1052 #endif
1053
1054 static int soc_camera_probe(struct soc_camera_device *icd);
1055
1056 /* So far this function cannot fail */
1057 static void scan_add_host(struct soc_camera_host *ici)
1058 {
1059 struct soc_camera_device *icd;
1060
1061 mutex_lock(&list_lock);
1062
1063 list_for_each_entry(icd, &devices, list) {
1064 if (icd->iface == ici->nr) {
1065 icd->parent = ici->v4l2_dev.dev;
1066 soc_camera_probe(icd);
1067 }
1068 }
1069
1070 mutex_unlock(&list_lock);
1071 }
1072
1073 #ifdef CONFIG_I2C_BOARDINFO
1074 static int soc_camera_init_i2c(struct soc_camera_device *icd,
1075 struct soc_camera_desc *sdesc)
1076 {
1077 struct i2c_client *client;
1078 struct soc_camera_host *ici = to_soc_camera_host(icd->parent);
1079 struct soc_camera_host_desc *shd = &sdesc->host_desc;
1080 struct i2c_adapter *adap = i2c_get_adapter(shd->i2c_adapter_id);
1081 struct v4l2_subdev *subdev;
1082
1083 if (!adap) {
1084 dev_err(icd->pdev, "Cannot get I2C adapter #%d. No driver?\n",
1085 shd->i2c_adapter_id);
1086 goto ei2cga;
1087 }
1088
1089 shd->board_info->platform_data = &sdesc->subdev_desc;
1090
1091 subdev = v4l2_i2c_new_subdev_board(&ici->v4l2_dev, adap,
1092 shd->board_info, NULL);
1093 if (!subdev)
1094 goto ei2cnd;
1095
1096 client = v4l2_get_subdevdata(subdev);
1097
1098 /* Use to_i2c_client(dev) to recover the i2c client */
1099 icd->control = &client->dev;
1100
1101 return 0;
1102 ei2cnd:
1103 i2c_put_adapter(adap);
1104 ei2cga:
1105 return -ENODEV;
1106 }
1107
1108 static void soc_camera_free_i2c(struct soc_camera_device *icd)
1109 {
1110 struct i2c_client *client =
1111 to_i2c_client(to_soc_camera_control(icd));
1112 struct i2c_adapter *adap = client->adapter;
1113
1114 icd->control = NULL;
1115 v4l2_device_unregister_subdev(i2c_get_clientdata(client));
1116 i2c_unregister_device(client);
1117 i2c_put_adapter(adap);
1118 }
1119 #else
1120 #define soc_camera_init_i2c(icd, sdesc) (-ENODEV)
1121 #define soc_camera_free_i2c(icd) do {} while (0)
1122 #endif
1123
1124 static int soc_camera_video_start(struct soc_camera_device *icd);
1125 static int video_dev_create(struct soc_camera_device *icd);
1126 /* Called during host-driver probe */
1127 static int soc_camera_probe(struct soc_camera_device *icd)
1128 {
1129 struct soc_camera_host *ici = to_soc_camera_host(icd->parent);
1130 struct soc_camera_desc *sdesc = to_soc_camera_desc(icd);
1131 struct soc_camera_host_desc *shd = &sdesc->host_desc;
1132 struct soc_camera_subdev_desc *ssdd = &sdesc->subdev_desc;
1133 struct device *control = NULL;
1134 struct v4l2_subdev *sd;
1135 struct v4l2_mbus_framefmt mf;
1136 int ret;
1137
1138 dev_info(icd->pdev, "Probing %s\n", dev_name(icd->pdev));
1139
1140 /*
1141 * Currently the subdev with the largest number of controls (13) is
1142 * ov6550. So let's pick 16 as a hint for the control handler. Note
1143 * that this is a hint only: too large and you waste some memory, too
1144 * small and there is a (very) small performance hit when looking up
1145 * controls in the internal hash.
1146 */
1147 ret = v4l2_ctrl_handler_init(&icd->ctrl_handler, 16);
1148 if (ret < 0)
1149 return ret;
1150
1151 /* The camera could have been already on, try to reset */
1152 if (ssdd->reset)
1153 ssdd->reset(icd->pdev);
1154
1155 mutex_lock(&ici->host_lock);
1156 ret = ici->ops->add(icd);
1157 mutex_unlock(&ici->host_lock);
1158 if (ret < 0)
1159 goto eadd;
1160
1161 /* Must have icd->vdev before registering the device */
1162 ret = video_dev_create(icd);
1163 if (ret < 0)
1164 goto evdc;
1165
1166 /* Non-i2c cameras, e.g., soc_camera_platform, have no board_info */
1167 if (shd->board_info) {
1168 ret = soc_camera_init_i2c(icd, sdesc);
1169 if (ret < 0)
1170 goto eadddev;
1171 } else if (!shd->add_device || !shd->del_device) {
1172 ret = -EINVAL;
1173 goto eadddev;
1174 } else {
1175 if (shd->module_name)
1176 ret = request_module(shd->module_name);
1177
1178 ret = shd->add_device(icd);
1179 if (ret < 0)
1180 goto eadddev;
1181
1182 /*
1183 * FIXME: this is racy, have to use driver-binding notification,
1184 * when it is available
1185 */
1186 control = to_soc_camera_control(icd);
1187 if (!control || !control->driver || !dev_get_drvdata(control) ||
1188 !try_module_get(control->driver->owner)) {
1189 shd->del_device(icd);
1190 ret = -ENODEV;
1191 goto enodrv;
1192 }
1193 }
1194
1195 sd = soc_camera_to_subdev(icd);
1196 sd->grp_id = soc_camera_grp_id(icd);
1197 v4l2_set_subdev_hostdata(sd, icd);
1198
1199 ret = v4l2_ctrl_add_handler(&icd->ctrl_handler, sd->ctrl_handler, NULL);
1200 if (ret < 0)
1201 goto ectrl;
1202
1203 /* At this point client .probe() should have run already */
1204 ret = soc_camera_init_user_formats(icd);
1205 if (ret < 0)
1206 goto eiufmt;
1207
1208 icd->field = V4L2_FIELD_ANY;
1209
1210 /*
1211 * ..._video_start() will create a device node, video_register_device()
1212 * itself is protected against concurrent open() calls, but we also have
1213 * to protect our data.
1214 */
1215 mutex_lock(&ici->host_lock);
1216
1217 ret = soc_camera_video_start(icd);
1218 if (ret < 0)
1219 goto evidstart;
1220
1221 /* Try to improve our guess of a reasonable window format */
1222 if (!v4l2_subdev_call(sd, video, g_mbus_fmt, &mf)) {
1223 icd->user_width = mf.width;
1224 icd->user_height = mf.height;
1225 icd->colorspace = mf.colorspace;
1226 icd->field = mf.field;
1227 }
1228
1229 ici->ops->remove(icd);
1230
1231 mutex_unlock(&ici->host_lock);
1232
1233 return 0;
1234
1235 evidstart:
1236 mutex_unlock(&ici->host_lock);
1237 soc_camera_free_user_formats(icd);
1238 eiufmt:
1239 ectrl:
1240 if (shd->board_info) {
1241 soc_camera_free_i2c(icd);
1242 } else {
1243 shd->del_device(icd);
1244 module_put(control->driver->owner);
1245 }
1246 enodrv:
1247 eadddev:
1248 video_device_release(icd->vdev);
1249 icd->vdev = NULL;
1250 evdc:
1251 mutex_lock(&ici->host_lock);
1252 ici->ops->remove(icd);
1253 mutex_unlock(&ici->host_lock);
1254 eadd:
1255 v4l2_ctrl_handler_free(&icd->ctrl_handler);
1256 return ret;
1257 }
1258
1259 /*
1260 * This is called on device_unregister, which only means we have to disconnect
1261 * from the host, but not remove ourselves from the device list
1262 */
1263 static int soc_camera_remove(struct soc_camera_device *icd)
1264 {
1265 struct soc_camera_desc *sdesc = to_soc_camera_desc(icd);
1266 struct video_device *vdev = icd->vdev;
1267
1268 BUG_ON(!icd->parent);
1269
1270 v4l2_ctrl_handler_free(&icd->ctrl_handler);
1271 if (vdev) {
1272 video_unregister_device(vdev);
1273 icd->vdev = NULL;
1274 }
1275
1276 if (sdesc->host_desc.board_info) {
1277 soc_camera_free_i2c(icd);
1278 } else {
1279 struct device_driver *drv = to_soc_camera_control(icd)->driver;
1280 if (drv) {
1281 sdesc->host_desc.del_device(icd);
1282 module_put(drv->owner);
1283 }
1284 }
1285 soc_camera_free_user_formats(icd);
1286
1287 return 0;
1288 }
1289
1290 static int default_cropcap(struct soc_camera_device *icd,
1291 struct v4l2_cropcap *a)
1292 {
1293 struct v4l2_subdev *sd = soc_camera_to_subdev(icd);
1294 return v4l2_subdev_call(sd, video, cropcap, a);
1295 }
1296
1297 static int default_g_crop(struct soc_camera_device *icd, struct v4l2_crop *a)
1298 {
1299 struct v4l2_subdev *sd = soc_camera_to_subdev(icd);
1300 return v4l2_subdev_call(sd, video, g_crop, a);
1301 }
1302
1303 static int default_s_crop(struct soc_camera_device *icd, const struct v4l2_crop *a)
1304 {
1305 struct v4l2_subdev *sd = soc_camera_to_subdev(icd);
1306 return v4l2_subdev_call(sd, video, s_crop, a);
1307 }
1308
1309 static int default_g_parm(struct soc_camera_device *icd,
1310 struct v4l2_streamparm *parm)
1311 {
1312 struct v4l2_subdev *sd = soc_camera_to_subdev(icd);
1313 return v4l2_subdev_call(sd, video, g_parm, parm);
1314 }
1315
1316 static int default_s_parm(struct soc_camera_device *icd,
1317 struct v4l2_streamparm *parm)
1318 {
1319 struct v4l2_subdev *sd = soc_camera_to_subdev(icd);
1320 return v4l2_subdev_call(sd, video, s_parm, parm);
1321 }
1322
1323 static int default_enum_framesizes(struct soc_camera_device *icd,
1324 struct v4l2_frmsizeenum *fsize)
1325 {
1326 int ret;
1327 struct v4l2_subdev *sd = soc_camera_to_subdev(icd);
1328 const struct soc_camera_format_xlate *xlate;
1329 __u32 pixfmt = fsize->pixel_format;
1330 struct v4l2_frmsizeenum fsize_mbus = *fsize;
1331
1332 xlate = soc_camera_xlate_by_fourcc(icd, pixfmt);
1333 if (!xlate)
1334 return -EINVAL;
1335 /* map xlate-code to pixel_format, sensor only handle xlate-code*/
1336 fsize_mbus.pixel_format = xlate->code;
1337
1338 ret = v4l2_subdev_call(sd, video, enum_framesizes, &fsize_mbus);
1339 if (ret < 0)
1340 return ret;
1341
1342 *fsize = fsize_mbus;
1343 fsize->pixel_format = pixfmt;
1344
1345 return 0;
1346 }
1347
1348 int soc_camera_host_register(struct soc_camera_host *ici)
1349 {
1350 struct soc_camera_host *ix;
1351 int ret;
1352
1353 if (!ici || !ici->ops ||
1354 !ici->ops->try_fmt ||
1355 !ici->ops->set_fmt ||
1356 !ici->ops->set_bus_param ||
1357 !ici->ops->querycap ||
1358 ((!ici->ops->init_videobuf ||
1359 !ici->ops->reqbufs) &&
1360 !ici->ops->init_videobuf2) ||
1361 !ici->ops->add ||
1362 !ici->ops->remove ||
1363 !ici->ops->poll ||
1364 !ici->v4l2_dev.dev)
1365 return -EINVAL;
1366
1367 if (!ici->ops->set_crop)
1368 ici->ops->set_crop = default_s_crop;
1369 if (!ici->ops->get_crop)
1370 ici->ops->get_crop = default_g_crop;
1371 if (!ici->ops->cropcap)
1372 ici->ops->cropcap = default_cropcap;
1373 if (!ici->ops->set_parm)
1374 ici->ops->set_parm = default_s_parm;
1375 if (!ici->ops->get_parm)
1376 ici->ops->get_parm = default_g_parm;
1377 if (!ici->ops->enum_framesizes)
1378 ici->ops->enum_framesizes = default_enum_framesizes;
1379
1380 mutex_lock(&list_lock);
1381 list_for_each_entry(ix, &hosts, list) {
1382 if (ix->nr == ici->nr) {
1383 ret = -EBUSY;
1384 goto edevreg;
1385 }
1386 }
1387
1388 ret = v4l2_device_register(ici->v4l2_dev.dev, &ici->v4l2_dev);
1389 if (ret < 0)
1390 goto edevreg;
1391
1392 list_add_tail(&ici->list, &hosts);
1393 mutex_unlock(&list_lock);
1394
1395 mutex_init(&ici->host_lock);
1396 scan_add_host(ici);
1397
1398 return 0;
1399
1400 edevreg:
1401 mutex_unlock(&list_lock);
1402 return ret;
1403 }
1404 EXPORT_SYMBOL(soc_camera_host_register);
1405
1406 /* Unregister all clients! */
1407 void soc_camera_host_unregister(struct soc_camera_host *ici)
1408 {
1409 struct soc_camera_device *icd;
1410
1411 mutex_lock(&list_lock);
1412
1413 list_del(&ici->list);
1414 list_for_each_entry(icd, &devices, list)
1415 if (icd->iface == ici->nr && to_soc_camera_control(icd))
1416 soc_camera_remove(icd);
1417
1418 mutex_unlock(&list_lock);
1419
1420 v4l2_device_unregister(&ici->v4l2_dev);
1421 }
1422 EXPORT_SYMBOL(soc_camera_host_unregister);
1423
1424 /* Image capture device */
1425 static int soc_camera_device_register(struct soc_camera_device *icd)
1426 {
1427 struct soc_camera_device *ix;
1428 int num = -1, i;
1429
1430 for (i = 0; i < 256 && num < 0; i++) {
1431 num = i;
1432 /* Check if this index is available on this interface */
1433 list_for_each_entry(ix, &devices, list) {
1434 if (ix->iface == icd->iface && ix->devnum == i) {
1435 num = -1;
1436 break;
1437 }
1438 }
1439 }
1440
1441 if (num < 0)
1442 /*
1443 * ok, we have 256 cameras on this host...
1444 * man, stay reasonable...
1445 */
1446 return -ENOMEM;
1447
1448 icd->devnum = num;
1449 icd->use_count = 0;
1450 icd->host_priv = NULL;
1451
1452 list_add_tail(&icd->list, &devices);
1453
1454 return 0;
1455 }
1456
1457 static const struct v4l2_ioctl_ops soc_camera_ioctl_ops = {
1458 .vidioc_querycap = soc_camera_querycap,
1459 .vidioc_try_fmt_vid_cap = soc_camera_try_fmt_vid_cap,
1460 .vidioc_g_fmt_vid_cap = soc_camera_g_fmt_vid_cap,
1461 .vidioc_s_fmt_vid_cap = soc_camera_s_fmt_vid_cap,
1462 .vidioc_enum_fmt_vid_cap = soc_camera_enum_fmt_vid_cap,
1463 .vidioc_enum_input = soc_camera_enum_input,
1464 .vidioc_g_input = soc_camera_g_input,
1465 .vidioc_s_input = soc_camera_s_input,
1466 .vidioc_s_std = soc_camera_s_std,
1467 .vidioc_g_std = soc_camera_g_std,
1468 .vidioc_enum_framesizes = soc_camera_enum_framesizes,
1469 .vidioc_reqbufs = soc_camera_reqbufs,
1470 .vidioc_querybuf = soc_camera_querybuf,
1471 .vidioc_qbuf = soc_camera_qbuf,
1472 .vidioc_dqbuf = soc_camera_dqbuf,
1473 .vidioc_create_bufs = soc_camera_create_bufs,
1474 .vidioc_prepare_buf = soc_camera_prepare_buf,
1475 .vidioc_streamon = soc_camera_streamon,
1476 .vidioc_streamoff = soc_camera_streamoff,
1477 .vidioc_cropcap = soc_camera_cropcap,
1478 .vidioc_g_crop = soc_camera_g_crop,
1479 .vidioc_s_crop = soc_camera_s_crop,
1480 .vidioc_g_selection = soc_camera_g_selection,
1481 .vidioc_s_selection = soc_camera_s_selection,
1482 .vidioc_g_parm = soc_camera_g_parm,
1483 .vidioc_s_parm = soc_camera_s_parm,
1484 .vidioc_g_chip_ident = soc_camera_g_chip_ident,
1485 #ifdef CONFIG_VIDEO_ADV_DEBUG
1486 .vidioc_g_register = soc_camera_g_register,
1487 .vidioc_s_register = soc_camera_s_register,
1488 #endif
1489 };
1490
1491 static int video_dev_create(struct soc_camera_device *icd)
1492 {
1493 struct soc_camera_host *ici = to_soc_camera_host(icd->parent);
1494 struct video_device *vdev = video_device_alloc();
1495
1496 if (!vdev)
1497 return -ENOMEM;
1498
1499 strlcpy(vdev->name, ici->drv_name, sizeof(vdev->name));
1500
1501 vdev->parent = icd->pdev;
1502 vdev->current_norm = V4L2_STD_UNKNOWN;
1503 vdev->fops = &soc_camera_fops;
1504 vdev->ioctl_ops = &soc_camera_ioctl_ops;
1505 vdev->release = video_device_release;
1506 vdev->tvnorms = V4L2_STD_UNKNOWN;
1507 vdev->ctrl_handler = &icd->ctrl_handler;
1508 vdev->lock = &ici->host_lock;
1509
1510 icd->vdev = vdev;
1511
1512 return 0;
1513 }
1514
1515 /*
1516 * Called from soc_camera_probe() above with .host_lock held
1517 */
1518 static int soc_camera_video_start(struct soc_camera_device *icd)
1519 {
1520 const struct device_type *type = icd->vdev->dev.type;
1521 int ret;
1522
1523 if (!icd->parent)
1524 return -ENODEV;
1525
1526 ret = video_register_device(icd->vdev, VFL_TYPE_GRABBER, -1);
1527 if (ret < 0) {
1528 dev_err(icd->pdev, "video_register_device failed: %d\n", ret);
1529 return ret;
1530 }
1531
1532 /* Restore device type, possibly set by the subdevice driver */
1533 icd->vdev->dev.type = type;
1534
1535 return 0;
1536 }
1537
1538 static int soc_camera_pdrv_probe(struct platform_device *pdev)
1539 {
1540 struct soc_camera_desc *sdesc = pdev->dev.platform_data;
1541 struct soc_camera_subdev_desc *ssdd = &sdesc->subdev_desc;
1542 struct soc_camera_device *icd;
1543 int ret;
1544
1545 if (!sdesc)
1546 return -EINVAL;
1547
1548 icd = devm_kzalloc(&pdev->dev, sizeof(*icd), GFP_KERNEL);
1549 if (!icd)
1550 return -ENOMEM;
1551
1552 ret = devm_regulator_bulk_get(&pdev->dev, ssdd->num_regulators,
1553 ssdd->regulators);
1554 if (ret < 0)
1555 return ret;
1556
1557 icd->iface = sdesc->host_desc.bus_id;
1558 icd->sdesc = sdesc;
1559 icd->pdev = &pdev->dev;
1560 platform_set_drvdata(pdev, icd);
1561
1562 icd->user_width = DEFAULT_WIDTH;
1563 icd->user_height = DEFAULT_HEIGHT;
1564
1565 return soc_camera_device_register(icd);
1566 }
1567
1568 /*
1569 * Only called on rmmod for each platform device, since they are not
1570 * hot-pluggable. Now we know, that all our users - hosts and devices have
1571 * been unloaded already
1572 */
1573 static int soc_camera_pdrv_remove(struct platform_device *pdev)
1574 {
1575 struct soc_camera_device *icd = platform_get_drvdata(pdev);
1576
1577 if (!icd)
1578 return -EINVAL;
1579
1580 list_del(&icd->list);
1581
1582 return 0;
1583 }
1584
1585 static struct platform_driver __refdata soc_camera_pdrv = {
1586 .probe = soc_camera_pdrv_probe,
1587 .remove = soc_camera_pdrv_remove,
1588 .driver = {
1589 .name = "soc-camera-pdrv",
1590 .owner = THIS_MODULE,
1591 },
1592 };
1593
1594 module_platform_driver(soc_camera_pdrv);
1595
1596 MODULE_DESCRIPTION("Image capture bus driver");
1597 MODULE_AUTHOR("Guennadi Liakhovetski <kernel@pengutronix.de>");
1598 MODULE_LICENSE("GPL");
1599 MODULE_ALIAS("platform:soc-camera-pdrv");
kernel source for telekom puls (alcatel/mediatek)