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Merge git://git.kernel.org/pub/scm/linux/kernel/git/herbert/crypto-2.6
[GitHub/mt8127/android_kernel_alcatel_ttab.git] / drivers / media / platform / soc_camera / soc_camera.c
1 /*
2 * camera image capture (abstract) bus driver
3 *
4 * Copyright (C) 2008, Guennadi Liakhovetski <kernel@pengutronix.de>
5 *
6 * This driver provides an interface between platform-specific camera
7 * busses and camera devices. It should be used if the camera is
8 * connected not over a "proper" bus like PCI or USB, but over a
9 * special bus, like, for example, the Quick Capture interface on PXA270
10 * SoCs. Later it should also be used for i.MX31 SoCs from Freescale.
11 * It can handle multiple cameras and / or multiple busses, which can
12 * be used, e.g., in stereo-vision applications.
13 *
14 * This program is free software; you can redistribute it and/or modify
15 * it under the terms of the GNU General Public License version 2 as
16 * published by the Free Software Foundation.
17 */
18
19 #include <linux/device.h>
20 #include <linux/err.h>
21 #include <linux/i2c.h>
22 #include <linux/init.h>
23 #include <linux/list.h>
24 #include <linux/mutex.h>
25 #include <linux/module.h>
26 #include <linux/platform_device.h>
27 #include <linux/regulator/consumer.h>
28 #include <linux/slab.h>
29 #include <linux/pm_runtime.h>
30 #include <linux/vmalloc.h>
31
32 #include <media/soc_camera.h>
33 #include <media/v4l2-common.h>
34 #include <media/v4l2-ioctl.h>
35 #include <media/v4l2-dev.h>
36 #include <media/videobuf-core.h>
37 #include <media/videobuf2-core.h>
38 #include <media/soc_mediabus.h>
39
40 /* Default to VGA resolution */
41 #define DEFAULT_WIDTH 640
42 #define DEFAULT_HEIGHT 480
43
44 #define is_streaming(ici, icd) \
45 (((ici)->ops->init_videobuf) ? \
46 (icd)->vb_vidq.streaming : \
47 vb2_is_streaming(&(icd)->vb2_vidq))
48
49 static LIST_HEAD(hosts);
50 static LIST_HEAD(devices);
51 static DEFINE_MUTEX(list_lock); /* Protects the list of hosts */
52
53 int soc_camera_power_on(struct device *dev, struct soc_camera_link *icl)
54 {
55 int ret = regulator_bulk_enable(icl->num_regulators,
56 icl->regulators);
57 if (ret < 0) {
58 dev_err(dev, "Cannot enable regulators\n");
59 return ret;
60 }
61
62 if (icl->power) {
63 ret = icl->power(dev, 1);
64 if (ret < 0) {
65 dev_err(dev,
66 "Platform failed to power-on the camera.\n");
67 regulator_bulk_disable(icl->num_regulators,
68 icl->regulators);
69 }
70 }
71
72 return ret;
73 }
74 EXPORT_SYMBOL(soc_camera_power_on);
75
76 int soc_camera_power_off(struct device *dev, struct soc_camera_link *icl)
77 {
78 int ret = 0;
79 int err;
80
81 if (icl->power) {
82 err = icl->power(dev, 0);
83 if (err < 0) {
84 dev_err(dev,
85 "Platform failed to power-off the camera.\n");
86 ret = err;
87 }
88 }
89
90 err = regulator_bulk_disable(icl->num_regulators,
91 icl->regulators);
92 if (err < 0) {
93 dev_err(dev, "Cannot disable regulators\n");
94 ret = ret ? : err;
95 }
96
97 return ret;
98 }
99 EXPORT_SYMBOL(soc_camera_power_off);
100
101 static int __soc_camera_power_on(struct soc_camera_device *icd)
102 {
103 struct v4l2_subdev *sd = soc_camera_to_subdev(icd);
104 int ret;
105
106 ret = v4l2_subdev_call(sd, core, s_power, 1);
107 if (ret < 0 && ret != -ENOIOCTLCMD && ret != -ENODEV)
108 return ret;
109
110 return 0;
111 }
112
113 static int __soc_camera_power_off(struct soc_camera_device *icd)
114 {
115 struct v4l2_subdev *sd = soc_camera_to_subdev(icd);
116 int ret;
117
118 ret = v4l2_subdev_call(sd, core, s_power, 0);
119 if (ret < 0 && ret != -ENOIOCTLCMD && ret != -ENODEV)
120 return ret;
121
122 return 0;
123 }
124
125 const struct soc_camera_format_xlate *soc_camera_xlate_by_fourcc(
126 struct soc_camera_device *icd, unsigned int fourcc)
127 {
128 unsigned int i;
129
130 for (i = 0; i < icd->num_user_formats; i++)
131 if (icd->user_formats[i].host_fmt->fourcc == fourcc)
132 return icd->user_formats + i;
133 return NULL;
134 }
135 EXPORT_SYMBOL(soc_camera_xlate_by_fourcc);
136
137 /**
138 * soc_camera_apply_board_flags() - apply platform SOCAM_SENSOR_INVERT_* flags
139 * @icl: camera platform parameters
140 * @cfg: media bus configuration
141 * @return: resulting flags
142 */
143 unsigned long soc_camera_apply_board_flags(struct soc_camera_link *icl,
144 const struct v4l2_mbus_config *cfg)
145 {
146 unsigned long f, flags = cfg->flags;
147
148 /* If only one of the two polarities is supported, switch to the opposite */
149 if (icl->flags & SOCAM_SENSOR_INVERT_HSYNC) {
150 f = flags & (V4L2_MBUS_HSYNC_ACTIVE_HIGH | V4L2_MBUS_HSYNC_ACTIVE_LOW);
151 if (f == V4L2_MBUS_HSYNC_ACTIVE_HIGH || f == V4L2_MBUS_HSYNC_ACTIVE_LOW)
152 flags ^= V4L2_MBUS_HSYNC_ACTIVE_HIGH | V4L2_MBUS_HSYNC_ACTIVE_LOW;
153 }
154
155 if (icl->flags & SOCAM_SENSOR_INVERT_VSYNC) {
156 f = flags & (V4L2_MBUS_VSYNC_ACTIVE_HIGH | V4L2_MBUS_VSYNC_ACTIVE_LOW);
157 if (f == V4L2_MBUS_VSYNC_ACTIVE_HIGH || f == V4L2_MBUS_VSYNC_ACTIVE_LOW)
158 flags ^= V4L2_MBUS_VSYNC_ACTIVE_HIGH | V4L2_MBUS_VSYNC_ACTIVE_LOW;
159 }
160
161 if (icl->flags & SOCAM_SENSOR_INVERT_PCLK) {
162 f = flags & (V4L2_MBUS_PCLK_SAMPLE_RISING | V4L2_MBUS_PCLK_SAMPLE_FALLING);
163 if (f == V4L2_MBUS_PCLK_SAMPLE_RISING || f == V4L2_MBUS_PCLK_SAMPLE_FALLING)
164 flags ^= V4L2_MBUS_PCLK_SAMPLE_RISING | V4L2_MBUS_PCLK_SAMPLE_FALLING;
165 }
166
167 return flags;
168 }
169 EXPORT_SYMBOL(soc_camera_apply_board_flags);
170
171 #define pixfmtstr(x) (x) & 0xff, ((x) >> 8) & 0xff, ((x) >> 16) & 0xff, \
172 ((x) >> 24) & 0xff
173
174 static int soc_camera_try_fmt(struct soc_camera_device *icd,
175 struct v4l2_format *f)
176 {
177 struct soc_camera_host *ici = to_soc_camera_host(icd->parent);
178 const struct soc_camera_format_xlate *xlate;
179 struct v4l2_pix_format *pix = &f->fmt.pix;
180 int ret;
181
182 dev_dbg(icd->pdev, "TRY_FMT(%c%c%c%c, %ux%u)\n",
183 pixfmtstr(pix->pixelformat), pix->width, pix->height);
184
185 if (pix->pixelformat != V4L2_PIX_FMT_JPEG &&
186 !(ici->capabilities & SOCAM_HOST_CAP_STRIDE)) {
187 pix->bytesperline = 0;
188 pix->sizeimage = 0;
189 }
190
191 ret = ici->ops->try_fmt(icd, f);
192 if (ret < 0)
193 return ret;
194
195 xlate = soc_camera_xlate_by_fourcc(icd, pix->pixelformat);
196 if (!xlate)
197 return -EINVAL;
198
199 ret = soc_mbus_bytes_per_line(pix->width, xlate->host_fmt);
200 if (ret < 0)
201 return ret;
202
203 pix->bytesperline = max_t(u32, pix->bytesperline, ret);
204
205 ret = soc_mbus_image_size(xlate->host_fmt, pix->bytesperline,
206 pix->height);
207 if (ret < 0)
208 return ret;
209
210 pix->sizeimage = max_t(u32, pix->sizeimage, ret);
211
212 return 0;
213 }
214
215 static int soc_camera_try_fmt_vid_cap(struct file *file, void *priv,
216 struct v4l2_format *f)
217 {
218 struct soc_camera_device *icd = file->private_data;
219
220 WARN_ON(priv != file->private_data);
221
222 /* Only single-plane capture is supported so far */
223 if (f->type != V4L2_BUF_TYPE_VIDEO_CAPTURE)
224 return -EINVAL;
225
226 /* limit format to hardware capabilities */
227 return soc_camera_try_fmt(icd, f);
228 }
229
230 static int soc_camera_enum_input(struct file *file, void *priv,
231 struct v4l2_input *inp)
232 {
233 if (inp->index != 0)
234 return -EINVAL;
235
236 /* default is camera */
237 inp->type = V4L2_INPUT_TYPE_CAMERA;
238 inp->std = V4L2_STD_UNKNOWN;
239 strcpy(inp->name, "Camera");
240
241 return 0;
242 }
243
244 static int soc_camera_g_input(struct file *file, void *priv, unsigned int *i)
245 {
246 *i = 0;
247
248 return 0;
249 }
250
251 static int soc_camera_s_input(struct file *file, void *priv, unsigned int i)
252 {
253 if (i > 0)
254 return -EINVAL;
255
256 return 0;
257 }
258
259 static int soc_camera_s_std(struct file *file, void *priv, v4l2_std_id *a)
260 {
261 struct soc_camera_device *icd = file->private_data;
262 struct v4l2_subdev *sd = soc_camera_to_subdev(icd);
263
264 return v4l2_subdev_call(sd, core, s_std, *a);
265 }
266
267 static int soc_camera_g_std(struct file *file, void *priv, v4l2_std_id *a)
268 {
269 struct soc_camera_device *icd = file->private_data;
270 struct v4l2_subdev *sd = soc_camera_to_subdev(icd);
271
272 return v4l2_subdev_call(sd, core, g_std, a);
273 }
274
275 static int soc_camera_enum_framesizes(struct file *file, void *fh,
276 struct v4l2_frmsizeenum *fsize)
277 {
278 struct soc_camera_device *icd = file->private_data;
279 struct soc_camera_host *ici = to_soc_camera_host(icd->parent);
280
281 return ici->ops->enum_framesizes(icd, fsize);
282 }
283
284 static int soc_camera_reqbufs(struct file *file, void *priv,
285 struct v4l2_requestbuffers *p)
286 {
287 int ret;
288 struct soc_camera_device *icd = file->private_data;
289 struct soc_camera_host *ici = to_soc_camera_host(icd->parent);
290
291 WARN_ON(priv != file->private_data);
292
293 if (icd->streamer && icd->streamer != file)
294 return -EBUSY;
295
296 if (ici->ops->init_videobuf) {
297 ret = videobuf_reqbufs(&icd->vb_vidq, p);
298 if (ret < 0)
299 return ret;
300
301 ret = ici->ops->reqbufs(icd, p);
302 } else {
303 ret = vb2_reqbufs(&icd->vb2_vidq, p);
304 }
305
306 if (!ret && !icd->streamer)
307 icd->streamer = file;
308
309 return ret;
310 }
311
312 static int soc_camera_querybuf(struct file *file, void *priv,
313 struct v4l2_buffer *p)
314 {
315 struct soc_camera_device *icd = file->private_data;
316 struct soc_camera_host *ici = to_soc_camera_host(icd->parent);
317
318 WARN_ON(priv != file->private_data);
319
320 if (ici->ops->init_videobuf)
321 return videobuf_querybuf(&icd->vb_vidq, p);
322 else
323 return vb2_querybuf(&icd->vb2_vidq, p);
324 }
325
326 static int soc_camera_qbuf(struct file *file, void *priv,
327 struct v4l2_buffer *p)
328 {
329 struct soc_camera_device *icd = file->private_data;
330 struct soc_camera_host *ici = to_soc_camera_host(icd->parent);
331
332 WARN_ON(priv != file->private_data);
333
334 if (icd->streamer != file)
335 return -EBUSY;
336
337 if (ici->ops->init_videobuf)
338 return videobuf_qbuf(&icd->vb_vidq, p);
339 else
340 return vb2_qbuf(&icd->vb2_vidq, p);
341 }
342
343 static int soc_camera_dqbuf(struct file *file, void *priv,
344 struct v4l2_buffer *p)
345 {
346 struct soc_camera_device *icd = file->private_data;
347 struct soc_camera_host *ici = to_soc_camera_host(icd->parent);
348
349 WARN_ON(priv != file->private_data);
350
351 if (icd->streamer != file)
352 return -EBUSY;
353
354 if (ici->ops->init_videobuf)
355 return videobuf_dqbuf(&icd->vb_vidq, p, file->f_flags & O_NONBLOCK);
356 else
357 return vb2_dqbuf(&icd->vb2_vidq, p, file->f_flags & O_NONBLOCK);
358 }
359
360 static int soc_camera_create_bufs(struct file *file, void *priv,
361 struct v4l2_create_buffers *create)
362 {
363 struct soc_camera_device *icd = file->private_data;
364 struct soc_camera_host *ici = to_soc_camera_host(icd->parent);
365
366 /* videobuf2 only */
367 if (ici->ops->init_videobuf)
368 return -EINVAL;
369 else
370 return vb2_create_bufs(&icd->vb2_vidq, create);
371 }
372
373 static int soc_camera_prepare_buf(struct file *file, void *priv,
374 struct v4l2_buffer *b)
375 {
376 struct soc_camera_device *icd = file->private_data;
377 struct soc_camera_host *ici = to_soc_camera_host(icd->parent);
378
379 /* videobuf2 only */
380 if (ici->ops->init_videobuf)
381 return -EINVAL;
382 else
383 return vb2_prepare_buf(&icd->vb2_vidq, b);
384 }
385
386 /* Always entered with .video_lock held */
387 static int soc_camera_init_user_formats(struct soc_camera_device *icd)
388 {
389 struct v4l2_subdev *sd = soc_camera_to_subdev(icd);
390 struct soc_camera_host *ici = to_soc_camera_host(icd->parent);
391 unsigned int i, fmts = 0, raw_fmts = 0;
392 int ret;
393 enum v4l2_mbus_pixelcode code;
394
395 while (!v4l2_subdev_call(sd, video, enum_mbus_fmt, raw_fmts, &code))
396 raw_fmts++;
397
398 if (!ici->ops->get_formats)
399 /*
400 * Fallback mode - the host will have to serve all
401 * sensor-provided formats one-to-one to the user
402 */
403 fmts = raw_fmts;
404 else
405 /*
406 * First pass - only count formats this host-sensor
407 * configuration can provide
408 */
409 for (i = 0; i < raw_fmts; i++) {
410 ret = ici->ops->get_formats(icd, i, NULL);
411 if (ret < 0)
412 return ret;
413 fmts += ret;
414 }
415
416 if (!fmts)
417 return -ENXIO;
418
419 icd->user_formats =
420 vmalloc(fmts * sizeof(struct soc_camera_format_xlate));
421 if (!icd->user_formats)
422 return -ENOMEM;
423
424 dev_dbg(icd->pdev, "Found %d supported formats.\n", fmts);
425
426 /* Second pass - actually fill data formats */
427 fmts = 0;
428 for (i = 0; i < raw_fmts; i++)
429 if (!ici->ops->get_formats) {
430 v4l2_subdev_call(sd, video, enum_mbus_fmt, i, &code);
431 icd->user_formats[fmts].host_fmt =
432 soc_mbus_get_fmtdesc(code);
433 if (icd->user_formats[fmts].host_fmt)
434 icd->user_formats[fmts++].code = code;
435 } else {
436 ret = ici->ops->get_formats(icd, i,
437 &icd->user_formats[fmts]);
438 if (ret < 0)
439 goto egfmt;
440 fmts += ret;
441 }
442
443 icd->num_user_formats = fmts;
444 icd->current_fmt = &icd->user_formats[0];
445
446 return 0;
447
448 egfmt:
449 vfree(icd->user_formats);
450 return ret;
451 }
452
453 /* Always entered with .video_lock held */
454 static void soc_camera_free_user_formats(struct soc_camera_device *icd)
455 {
456 struct soc_camera_host *ici = to_soc_camera_host(icd->parent);
457
458 if (ici->ops->put_formats)
459 ici->ops->put_formats(icd);
460 icd->current_fmt = NULL;
461 icd->num_user_formats = 0;
462 vfree(icd->user_formats);
463 icd->user_formats = NULL;
464 }
465
466 /* Called with .vb_lock held, or from the first open(2), see comment there */
467 static int soc_camera_set_fmt(struct soc_camera_device *icd,
468 struct v4l2_format *f)
469 {
470 struct soc_camera_host *ici = to_soc_camera_host(icd->parent);
471 struct v4l2_pix_format *pix = &f->fmt.pix;
472 int ret;
473
474 dev_dbg(icd->pdev, "S_FMT(%c%c%c%c, %ux%u)\n",
475 pixfmtstr(pix->pixelformat), pix->width, pix->height);
476
477 /* We always call try_fmt() before set_fmt() or set_crop() */
478 ret = soc_camera_try_fmt(icd, f);
479 if (ret < 0)
480 return ret;
481
482 ret = ici->ops->set_fmt(icd, f);
483 if (ret < 0) {
484 return ret;
485 } else if (!icd->current_fmt ||
486 icd->current_fmt->host_fmt->fourcc != pix->pixelformat) {
487 dev_err(icd->pdev,
488 "Host driver hasn't set up current format correctly!\n");
489 return -EINVAL;
490 }
491
492 icd->user_width = pix->width;
493 icd->user_height = pix->height;
494 icd->bytesperline = pix->bytesperline;
495 icd->sizeimage = pix->sizeimage;
496 icd->colorspace = pix->colorspace;
497 icd->field = pix->field;
498 if (ici->ops->init_videobuf)
499 icd->vb_vidq.field = pix->field;
500
501 dev_dbg(icd->pdev, "set width: %d height: %d\n",
502 icd->user_width, icd->user_height);
503
504 /* set physical bus parameters */
505 return ici->ops->set_bus_param(icd);
506 }
507
508 static int soc_camera_open(struct file *file)
509 {
510 struct video_device *vdev = video_devdata(file);
511 struct soc_camera_device *icd = dev_get_drvdata(vdev->parent);
512 struct soc_camera_link *icl = to_soc_camera_link(icd);
513 struct soc_camera_host *ici;
514 int ret;
515
516 if (!to_soc_camera_control(icd))
517 /* No device driver attached */
518 return -ENODEV;
519
520 ici = to_soc_camera_host(icd->parent);
521
522 if (mutex_lock_interruptible(&icd->video_lock))
523 return -ERESTARTSYS;
524 if (!try_module_get(ici->ops->owner)) {
525 dev_err(icd->pdev, "Couldn't lock capture bus driver.\n");
526 ret = -EINVAL;
527 goto emodule;
528 }
529
530 icd->use_count++;
531
532 /* Now we really have to activate the camera */
533 if (icd->use_count == 1) {
534 /* Restore parameters before the last close() per V4L2 API */
535 struct v4l2_format f = {
536 .type = V4L2_BUF_TYPE_VIDEO_CAPTURE,
537 .fmt.pix = {
538 .width = icd->user_width,
539 .height = icd->user_height,
540 .field = icd->field,
541 .colorspace = icd->colorspace,
542 .pixelformat =
543 icd->current_fmt->host_fmt->fourcc,
544 },
545 };
546
547 /* The camera could have been already on, try to reset */
548 if (icl->reset)
549 icl->reset(icd->pdev);
550
551 /* Don't mess with the host during probe */
552 mutex_lock(&ici->host_lock);
553 ret = ici->ops->add(icd);
554 mutex_unlock(&ici->host_lock);
555 if (ret < 0) {
556 dev_err(icd->pdev, "Couldn't activate the camera: %d\n", ret);
557 goto eiciadd;
558 }
559
560 ret = __soc_camera_power_on(icd);
561 if (ret < 0)
562 goto epower;
563
564 pm_runtime_enable(&icd->vdev->dev);
565 ret = pm_runtime_resume(&icd->vdev->dev);
566 if (ret < 0 && ret != -ENOSYS)
567 goto eresume;
568
569 /*
570 * Try to configure with default parameters. Notice: this is the
571 * very first open, so, we cannot race against other calls,
572 * apart from someone else calling open() simultaneously, but
573 * .video_lock is protecting us against it.
574 */
575 ret = soc_camera_set_fmt(icd, &f);
576 if (ret < 0)
577 goto esfmt;
578
579 if (ici->ops->init_videobuf) {
580 ici->ops->init_videobuf(&icd->vb_vidq, icd);
581 } else {
582 ret = ici->ops->init_videobuf2(&icd->vb2_vidq, icd);
583 if (ret < 0)
584 goto einitvb;
585 }
586 v4l2_ctrl_handler_setup(&icd->ctrl_handler);
587 }
588 mutex_unlock(&icd->video_lock);
589
590 file->private_data = icd;
591 dev_dbg(icd->pdev, "camera device open\n");
592
593 return 0;
594
595 /*
596 * First four errors are entered with the .video_lock held
597 * and use_count == 1
598 */
599 einitvb:
600 esfmt:
601 pm_runtime_disable(&icd->vdev->dev);
602 eresume:
603 __soc_camera_power_off(icd);
604 epower:
605 ici->ops->remove(icd);
606 eiciadd:
607 icd->use_count--;
608 module_put(ici->ops->owner);
609 emodule:
610 mutex_unlock(&icd->video_lock);
611
612 return ret;
613 }
614
615 static int soc_camera_close(struct file *file)
616 {
617 struct soc_camera_device *icd = file->private_data;
618 struct soc_camera_host *ici = to_soc_camera_host(icd->parent);
619
620 mutex_lock(&icd->video_lock);
621 icd->use_count--;
622 if (!icd->use_count) {
623 pm_runtime_suspend(&icd->vdev->dev);
624 pm_runtime_disable(&icd->vdev->dev);
625
626 if (ici->ops->init_videobuf2)
627 vb2_queue_release(&icd->vb2_vidq);
628 ici->ops->remove(icd);
629
630 __soc_camera_power_off(icd);
631 }
632
633 if (icd->streamer == file)
634 icd->streamer = NULL;
635 mutex_unlock(&icd->video_lock);
636
637 module_put(ici->ops->owner);
638
639 dev_dbg(icd->pdev, "camera device close\n");
640
641 return 0;
642 }
643
644 static ssize_t soc_camera_read(struct file *file, char __user *buf,
645 size_t count, loff_t *ppos)
646 {
647 struct soc_camera_device *icd = file->private_data;
648 struct soc_camera_host *ici = to_soc_camera_host(icd->parent);
649
650 dev_dbg(icd->pdev, "read called, buf %p\n", buf);
651
652 if (ici->ops->init_videobuf2 && icd->vb2_vidq.io_modes & VB2_READ)
653 return vb2_read(&icd->vb2_vidq, buf, count, ppos,
654 file->f_flags & O_NONBLOCK);
655
656 dev_err(icd->pdev, "camera device read not implemented\n");
657
658 return -EINVAL;
659 }
660
661 static int soc_camera_mmap(struct file *file, struct vm_area_struct *vma)
662 {
663 struct soc_camera_device *icd = file->private_data;
664 struct soc_camera_host *ici = to_soc_camera_host(icd->parent);
665 int err;
666
667 dev_dbg(icd->pdev, "mmap called, vma=0x%08lx\n", (unsigned long)vma);
668
669 if (icd->streamer != file)
670 return -EBUSY;
671
672 if (mutex_lock_interruptible(&icd->video_lock))
673 return -ERESTARTSYS;
674 if (ici->ops->init_videobuf)
675 err = videobuf_mmap_mapper(&icd->vb_vidq, vma);
676 else
677 err = vb2_mmap(&icd->vb2_vidq, vma);
678 mutex_unlock(&icd->video_lock);
679
680 dev_dbg(icd->pdev, "vma start=0x%08lx, size=%ld, ret=%d\n",
681 (unsigned long)vma->vm_start,
682 (unsigned long)vma->vm_end - (unsigned long)vma->vm_start,
683 err);
684
685 return err;
686 }
687
688 static unsigned int soc_camera_poll(struct file *file, poll_table *pt)
689 {
690 struct soc_camera_device *icd = file->private_data;
691 struct soc_camera_host *ici = to_soc_camera_host(icd->parent);
692 unsigned res = POLLERR;
693
694 if (icd->streamer != file)
695 return POLLERR;
696
697 mutex_lock(&icd->video_lock);
698 if (ici->ops->init_videobuf && list_empty(&icd->vb_vidq.stream))
699 dev_err(icd->pdev, "Trying to poll with no queued buffers!\n");
700 else
701 res = ici->ops->poll(file, pt);
702 mutex_unlock(&icd->video_lock);
703 return res;
704 }
705
706 void soc_camera_lock(struct vb2_queue *vq)
707 {
708 struct soc_camera_device *icd = vb2_get_drv_priv(vq);
709 mutex_lock(&icd->video_lock);
710 }
711 EXPORT_SYMBOL(soc_camera_lock);
712
713 void soc_camera_unlock(struct vb2_queue *vq)
714 {
715 struct soc_camera_device *icd = vb2_get_drv_priv(vq);
716 mutex_unlock(&icd->video_lock);
717 }
718 EXPORT_SYMBOL(soc_camera_unlock);
719
720 static struct v4l2_file_operations soc_camera_fops = {
721 .owner = THIS_MODULE,
722 .open = soc_camera_open,
723 .release = soc_camera_close,
724 .unlocked_ioctl = video_ioctl2,
725 .read = soc_camera_read,
726 .mmap = soc_camera_mmap,
727 .poll = soc_camera_poll,
728 };
729
730 static int soc_camera_s_fmt_vid_cap(struct file *file, void *priv,
731 struct v4l2_format *f)
732 {
733 struct soc_camera_device *icd = file->private_data;
734 int ret;
735
736 WARN_ON(priv != file->private_data);
737
738 if (f->type != V4L2_BUF_TYPE_VIDEO_CAPTURE) {
739 dev_warn(icd->pdev, "Wrong buf-type %d\n", f->type);
740 return -EINVAL;
741 }
742
743 if (icd->streamer && icd->streamer != file)
744 return -EBUSY;
745
746 if (is_streaming(to_soc_camera_host(icd->parent), icd)) {
747 dev_err(icd->pdev, "S_FMT denied: queue initialised\n");
748 return -EBUSY;
749 }
750
751 ret = soc_camera_set_fmt(icd, f);
752
753 if (!ret && !icd->streamer)
754 icd->streamer = file;
755
756 return ret;
757 }
758
759 static int soc_camera_enum_fmt_vid_cap(struct file *file, void *priv,
760 struct v4l2_fmtdesc *f)
761 {
762 struct soc_camera_device *icd = file->private_data;
763 const struct soc_mbus_pixelfmt *format;
764
765 WARN_ON(priv != file->private_data);
766
767 if (f->index >= icd->num_user_formats)
768 return -EINVAL;
769
770 format = icd->user_formats[f->index].host_fmt;
771
772 if (format->name)
773 strlcpy(f->description, format->name, sizeof(f->description));
774 f->pixelformat = format->fourcc;
775 return 0;
776 }
777
778 static int soc_camera_g_fmt_vid_cap(struct file *file, void *priv,
779 struct v4l2_format *f)
780 {
781 struct soc_camera_device *icd = file->private_data;
782 struct v4l2_pix_format *pix = &f->fmt.pix;
783
784 WARN_ON(priv != file->private_data);
785
786 if (f->type != V4L2_BUF_TYPE_VIDEO_CAPTURE)
787 return -EINVAL;
788
789 pix->width = icd->user_width;
790 pix->height = icd->user_height;
791 pix->bytesperline = icd->bytesperline;
792 pix->sizeimage = icd->sizeimage;
793 pix->field = icd->field;
794 pix->pixelformat = icd->current_fmt->host_fmt->fourcc;
795 pix->colorspace = icd->colorspace;
796 dev_dbg(icd->pdev, "current_fmt->fourcc: 0x%08x\n",
797 icd->current_fmt->host_fmt->fourcc);
798 return 0;
799 }
800
801 static int soc_camera_querycap(struct file *file, void *priv,
802 struct v4l2_capability *cap)
803 {
804 struct soc_camera_device *icd = file->private_data;
805 struct soc_camera_host *ici = to_soc_camera_host(icd->parent);
806
807 WARN_ON(priv != file->private_data);
808
809 strlcpy(cap->driver, ici->drv_name, sizeof(cap->driver));
810 return ici->ops->querycap(ici, cap);
811 }
812
813 static int soc_camera_streamon(struct file *file, void *priv,
814 enum v4l2_buf_type i)
815 {
816 struct soc_camera_device *icd = file->private_data;
817 struct soc_camera_host *ici = to_soc_camera_host(icd->parent);
818 struct v4l2_subdev *sd = soc_camera_to_subdev(icd);
819 int ret;
820
821 WARN_ON(priv != file->private_data);
822
823 if (i != V4L2_BUF_TYPE_VIDEO_CAPTURE)
824 return -EINVAL;
825
826 if (icd->streamer != file)
827 return -EBUSY;
828
829 /* This calls buf_queue from host driver's videobuf_queue_ops */
830 if (ici->ops->init_videobuf)
831 ret = videobuf_streamon(&icd->vb_vidq);
832 else
833 ret = vb2_streamon(&icd->vb2_vidq, i);
834
835 if (!ret)
836 v4l2_subdev_call(sd, video, s_stream, 1);
837
838 return ret;
839 }
840
841 static int soc_camera_streamoff(struct file *file, void *priv,
842 enum v4l2_buf_type i)
843 {
844 struct soc_camera_device *icd = file->private_data;
845 struct v4l2_subdev *sd = soc_camera_to_subdev(icd);
846 struct soc_camera_host *ici = to_soc_camera_host(icd->parent);
847
848 WARN_ON(priv != file->private_data);
849
850 if (i != V4L2_BUF_TYPE_VIDEO_CAPTURE)
851 return -EINVAL;
852
853 if (icd->streamer != file)
854 return -EBUSY;
855
856 /*
857 * This calls buf_release from host driver's videobuf_queue_ops for all
858 * remaining buffers. When the last buffer is freed, stop capture
859 */
860 if (ici->ops->init_videobuf)
861 videobuf_streamoff(&icd->vb_vidq);
862 else
863 vb2_streamoff(&icd->vb2_vidq, i);
864
865 v4l2_subdev_call(sd, video, s_stream, 0);
866
867 return 0;
868 }
869
870 static int soc_camera_cropcap(struct file *file, void *fh,
871 struct v4l2_cropcap *a)
872 {
873 struct soc_camera_device *icd = file->private_data;
874 struct soc_camera_host *ici = to_soc_camera_host(icd->parent);
875
876 return ici->ops->cropcap(icd, a);
877 }
878
879 static int soc_camera_g_crop(struct file *file, void *fh,
880 struct v4l2_crop *a)
881 {
882 struct soc_camera_device *icd = file->private_data;
883 struct soc_camera_host *ici = to_soc_camera_host(icd->parent);
884 int ret;
885
886 ret = ici->ops->get_crop(icd, a);
887
888 return ret;
889 }
890
891 /*
892 * According to the V4L2 API, drivers shall not update the struct v4l2_crop
893 * argument with the actual geometry, instead, the user shall use G_CROP to
894 * retrieve it.
895 */
896 static int soc_camera_s_crop(struct file *file, void *fh,
897 const struct v4l2_crop *a)
898 {
899 struct soc_camera_device *icd = file->private_data;
900 struct soc_camera_host *ici = to_soc_camera_host(icd->parent);
901 const struct v4l2_rect *rect = &a->c;
902 struct v4l2_crop current_crop;
903 int ret;
904
905 if (a->type != V4L2_BUF_TYPE_VIDEO_CAPTURE)
906 return -EINVAL;
907
908 dev_dbg(icd->pdev, "S_CROP(%ux%u@%u:%u)\n",
909 rect->width, rect->height, rect->left, rect->top);
910
911 /* If get_crop fails, we'll let host and / or client drivers decide */
912 ret = ici->ops->get_crop(icd, &current_crop);
913
914 /* Prohibit window size change with initialised buffers */
915 if (ret < 0) {
916 dev_err(icd->pdev,
917 "S_CROP denied: getting current crop failed\n");
918 } else if ((a->c.width == current_crop.c.width &&
919 a->c.height == current_crop.c.height) ||
920 !is_streaming(ici, icd)) {
921 /* same size or not streaming - use .set_crop() */
922 ret = ici->ops->set_crop(icd, a);
923 } else if (ici->ops->set_livecrop) {
924 ret = ici->ops->set_livecrop(icd, a);
925 } else {
926 dev_err(icd->pdev,
927 "S_CROP denied: queue initialised and sizes differ\n");
928 ret = -EBUSY;
929 }
930
931 return ret;
932 }
933
934 static int soc_camera_g_selection(struct file *file, void *fh,
935 struct v4l2_selection *s)
936 {
937 struct soc_camera_device *icd = file->private_data;
938 struct soc_camera_host *ici = to_soc_camera_host(icd->parent);
939
940 /* With a wrong type no need to try to fall back to cropping */
941 if (s->type != V4L2_BUF_TYPE_VIDEO_CAPTURE)
942 return -EINVAL;
943
944 if (!ici->ops->get_selection)
945 return -ENOTTY;
946
947 return ici->ops->get_selection(icd, s);
948 }
949
950 static int soc_camera_s_selection(struct file *file, void *fh,
951 struct v4l2_selection *s)
952 {
953 struct soc_camera_device *icd = file->private_data;
954 struct soc_camera_host *ici = to_soc_camera_host(icd->parent);
955 int ret;
956
957 /* In all these cases cropping emulation will not help */
958 if (s->type != V4L2_BUF_TYPE_VIDEO_CAPTURE ||
959 (s->target != V4L2_SEL_TGT_COMPOSE &&
960 s->target != V4L2_SEL_TGT_CROP))
961 return -EINVAL;
962
963 if (s->target == V4L2_SEL_TGT_COMPOSE) {
964 /* No output size change during a running capture! */
965 if (is_streaming(ici, icd) &&
966 (icd->user_width != s->r.width ||
967 icd->user_height != s->r.height))
968 return -EBUSY;
969
970 /*
971 * Only one user is allowed to change the output format, touch
972 * buffers, start / stop streaming, poll for data
973 */
974 if (icd->streamer && icd->streamer != file)
975 return -EBUSY;
976 }
977
978 if (!ici->ops->set_selection)
979 return -ENOTTY;
980
981 ret = ici->ops->set_selection(icd, s);
982 if (!ret &&
983 s->target == V4L2_SEL_TGT_COMPOSE) {
984 icd->user_width = s->r.width;
985 icd->user_height = s->r.height;
986 if (!icd->streamer)
987 icd->streamer = file;
988 }
989
990 return ret;
991 }
992
993 static int soc_camera_g_parm(struct file *file, void *fh,
994 struct v4l2_streamparm *a)
995 {
996 struct soc_camera_device *icd = file->private_data;
997 struct soc_camera_host *ici = to_soc_camera_host(icd->parent);
998
999 if (ici->ops->get_parm)
1000 return ici->ops->get_parm(icd, a);
1001
1002 return -ENOIOCTLCMD;
1003 }
1004
1005 static int soc_camera_s_parm(struct file *file, void *fh,
1006 struct v4l2_streamparm *a)
1007 {
1008 struct soc_camera_device *icd = file->private_data;
1009 struct soc_camera_host *ici = to_soc_camera_host(icd->parent);
1010
1011 if (ici->ops->set_parm)
1012 return ici->ops->set_parm(icd, a);
1013
1014 return -ENOIOCTLCMD;
1015 }
1016
1017 static int soc_camera_g_chip_ident(struct file *file, void *fh,
1018 struct v4l2_dbg_chip_ident *id)
1019 {
1020 struct soc_camera_device *icd = file->private_data;
1021 struct v4l2_subdev *sd = soc_camera_to_subdev(icd);
1022
1023 return v4l2_subdev_call(sd, core, g_chip_ident, id);
1024 }
1025
1026 #ifdef CONFIG_VIDEO_ADV_DEBUG
1027 static int soc_camera_g_register(struct file *file, void *fh,
1028 struct v4l2_dbg_register *reg)
1029 {
1030 struct soc_camera_device *icd = file->private_data;
1031 struct v4l2_subdev *sd = soc_camera_to_subdev(icd);
1032
1033 return v4l2_subdev_call(sd, core, g_register, reg);
1034 }
1035
1036 static int soc_camera_s_register(struct file *file, void *fh,
1037 struct v4l2_dbg_register *reg)
1038 {
1039 struct soc_camera_device *icd = file->private_data;
1040 struct v4l2_subdev *sd = soc_camera_to_subdev(icd);
1041
1042 return v4l2_subdev_call(sd, core, s_register, reg);
1043 }
1044 #endif
1045
1046 static int soc_camera_probe(struct soc_camera_device *icd);
1047
1048 /* So far this function cannot fail */
1049 static void scan_add_host(struct soc_camera_host *ici)
1050 {
1051 struct soc_camera_device *icd;
1052
1053 mutex_lock(&ici->host_lock);
1054
1055 list_for_each_entry(icd, &devices, list) {
1056 if (icd->iface == ici->nr) {
1057 icd->parent = ici->v4l2_dev.dev;
1058 soc_camera_probe(icd);
1059 }
1060 }
1061
1062 mutex_unlock(&ici->host_lock);
1063 }
1064
1065 #ifdef CONFIG_I2C_BOARDINFO
1066 static int soc_camera_init_i2c(struct soc_camera_device *icd,
1067 struct soc_camera_link *icl)
1068 {
1069 struct i2c_client *client;
1070 struct soc_camera_host *ici = to_soc_camera_host(icd->parent);
1071 struct i2c_adapter *adap = i2c_get_adapter(icl->i2c_adapter_id);
1072 struct v4l2_subdev *subdev;
1073
1074 if (!adap) {
1075 dev_err(icd->pdev, "Cannot get I2C adapter #%d. No driver?\n",
1076 icl->i2c_adapter_id);
1077 goto ei2cga;
1078 }
1079
1080 icl->board_info->platform_data = icl;
1081
1082 subdev = v4l2_i2c_new_subdev_board(&ici->v4l2_dev, adap,
1083 icl->board_info, NULL);
1084 if (!subdev)
1085 goto ei2cnd;
1086
1087 client = v4l2_get_subdevdata(subdev);
1088
1089 /* Use to_i2c_client(dev) to recover the i2c client */
1090 icd->control = &client->dev;
1091
1092 return 0;
1093 ei2cnd:
1094 i2c_put_adapter(adap);
1095 ei2cga:
1096 return -ENODEV;
1097 }
1098
1099 static void soc_camera_free_i2c(struct soc_camera_device *icd)
1100 {
1101 struct i2c_client *client =
1102 to_i2c_client(to_soc_camera_control(icd));
1103 struct i2c_adapter *adap = client->adapter;
1104
1105 icd->control = NULL;
1106 v4l2_device_unregister_subdev(i2c_get_clientdata(client));
1107 i2c_unregister_device(client);
1108 i2c_put_adapter(adap);
1109 }
1110 #else
1111 #define soc_camera_init_i2c(icd, icl) (-ENODEV)
1112 #define soc_camera_free_i2c(icd) do {} while (0)
1113 #endif
1114
1115 static int soc_camera_video_start(struct soc_camera_device *icd);
1116 static int video_dev_create(struct soc_camera_device *icd);
1117 /* Called during host-driver probe */
1118 static int soc_camera_probe(struct soc_camera_device *icd)
1119 {
1120 struct soc_camera_host *ici = to_soc_camera_host(icd->parent);
1121 struct soc_camera_link *icl = to_soc_camera_link(icd);
1122 struct device *control = NULL;
1123 struct v4l2_subdev *sd;
1124 struct v4l2_mbus_framefmt mf;
1125 int ret;
1126
1127 dev_info(icd->pdev, "Probing %s\n", dev_name(icd->pdev));
1128
1129 /*
1130 * Currently the subdev with the largest number of controls (13) is
1131 * ov6550. So let's pick 16 as a hint for the control handler. Note
1132 * that this is a hint only: too large and you waste some memory, too
1133 * small and there is a (very) small performance hit when looking up
1134 * controls in the internal hash.
1135 */
1136 ret = v4l2_ctrl_handler_init(&icd->ctrl_handler, 16);
1137 if (ret < 0)
1138 return ret;
1139
1140 ret = regulator_bulk_get(icd->pdev, icl->num_regulators,
1141 icl->regulators);
1142 if (ret < 0)
1143 goto ereg;
1144
1145 /* The camera could have been already on, try to reset */
1146 if (icl->reset)
1147 icl->reset(icd->pdev);
1148
1149 ret = ici->ops->add(icd);
1150 if (ret < 0)
1151 goto eadd;
1152
1153 /* Must have icd->vdev before registering the device */
1154 ret = video_dev_create(icd);
1155 if (ret < 0)
1156 goto evdc;
1157
1158 /* Non-i2c cameras, e.g., soc_camera_platform, have no board_info */
1159 if (icl->board_info) {
1160 ret = soc_camera_init_i2c(icd, icl);
1161 if (ret < 0)
1162 goto eadddev;
1163 } else if (!icl->add_device || !icl->del_device) {
1164 ret = -EINVAL;
1165 goto eadddev;
1166 } else {
1167 if (icl->module_name)
1168 ret = request_module(icl->module_name);
1169
1170 ret = icl->add_device(icd);
1171 if (ret < 0)
1172 goto eadddev;
1173
1174 /*
1175 * FIXME: this is racy, have to use driver-binding notification,
1176 * when it is available
1177 */
1178 control = to_soc_camera_control(icd);
1179 if (!control || !control->driver || !dev_get_drvdata(control) ||
1180 !try_module_get(control->driver->owner)) {
1181 icl->del_device(icd);
1182 ret = -ENODEV;
1183 goto enodrv;
1184 }
1185 }
1186
1187 sd = soc_camera_to_subdev(icd);
1188 sd->grp_id = soc_camera_grp_id(icd);
1189 v4l2_set_subdev_hostdata(sd, icd);
1190
1191 ret = v4l2_ctrl_add_handler(&icd->ctrl_handler, sd->ctrl_handler, NULL);
1192 if (ret < 0)
1193 goto ectrl;
1194
1195 /* At this point client .probe() should have run already */
1196 ret = soc_camera_init_user_formats(icd);
1197 if (ret < 0)
1198 goto eiufmt;
1199
1200 icd->field = V4L2_FIELD_ANY;
1201
1202 /*
1203 * ..._video_start() will create a device node, video_register_device()
1204 * itself is protected against concurrent open() calls, but we also have
1205 * to protect our data.
1206 */
1207 mutex_lock(&icd->video_lock);
1208
1209 ret = soc_camera_video_start(icd);
1210 if (ret < 0)
1211 goto evidstart;
1212
1213 /* Try to improve our guess of a reasonable window format */
1214 if (!v4l2_subdev_call(sd, video, g_mbus_fmt, &mf)) {
1215 icd->user_width = mf.width;
1216 icd->user_height = mf.height;
1217 icd->colorspace = mf.colorspace;
1218 icd->field = mf.field;
1219 }
1220
1221 ici->ops->remove(icd);
1222
1223 mutex_unlock(&icd->video_lock);
1224
1225 return 0;
1226
1227 evidstart:
1228 mutex_unlock(&icd->video_lock);
1229 soc_camera_free_user_formats(icd);
1230 eiufmt:
1231 ectrl:
1232 if (icl->board_info) {
1233 soc_camera_free_i2c(icd);
1234 } else {
1235 icl->del_device(icd);
1236 module_put(control->driver->owner);
1237 }
1238 enodrv:
1239 eadddev:
1240 video_device_release(icd->vdev);
1241 icd->vdev = NULL;
1242 evdc:
1243 ici->ops->remove(icd);
1244 eadd:
1245 regulator_bulk_free(icl->num_regulators, icl->regulators);
1246 ereg:
1247 v4l2_ctrl_handler_free(&icd->ctrl_handler);
1248 return ret;
1249 }
1250
1251 /*
1252 * This is called on device_unregister, which only means we have to disconnect
1253 * from the host, but not remove ourselves from the device list
1254 */
1255 static int soc_camera_remove(struct soc_camera_device *icd)
1256 {
1257 struct soc_camera_link *icl = to_soc_camera_link(icd);
1258 struct video_device *vdev = icd->vdev;
1259
1260 BUG_ON(!icd->parent);
1261
1262 v4l2_ctrl_handler_free(&icd->ctrl_handler);
1263 if (vdev) {
1264 video_unregister_device(vdev);
1265 icd->vdev = NULL;
1266 }
1267
1268 if (icl->board_info) {
1269 soc_camera_free_i2c(icd);
1270 } else {
1271 struct device_driver *drv = to_soc_camera_control(icd)->driver;
1272 if (drv) {
1273 icl->del_device(icd);
1274 module_put(drv->owner);
1275 }
1276 }
1277 soc_camera_free_user_formats(icd);
1278
1279 regulator_bulk_free(icl->num_regulators, icl->regulators);
1280
1281 return 0;
1282 }
1283
1284 static int default_cropcap(struct soc_camera_device *icd,
1285 struct v4l2_cropcap *a)
1286 {
1287 struct v4l2_subdev *sd = soc_camera_to_subdev(icd);
1288 return v4l2_subdev_call(sd, video, cropcap, a);
1289 }
1290
1291 static int default_g_crop(struct soc_camera_device *icd, struct v4l2_crop *a)
1292 {
1293 struct v4l2_subdev *sd = soc_camera_to_subdev(icd);
1294 return v4l2_subdev_call(sd, video, g_crop, a);
1295 }
1296
1297 static int default_s_crop(struct soc_camera_device *icd, const struct v4l2_crop *a)
1298 {
1299 struct v4l2_subdev *sd = soc_camera_to_subdev(icd);
1300 return v4l2_subdev_call(sd, video, s_crop, a);
1301 }
1302
1303 static int default_g_parm(struct soc_camera_device *icd,
1304 struct v4l2_streamparm *parm)
1305 {
1306 struct v4l2_subdev *sd = soc_camera_to_subdev(icd);
1307 return v4l2_subdev_call(sd, video, g_parm, parm);
1308 }
1309
1310 static int default_s_parm(struct soc_camera_device *icd,
1311 struct v4l2_streamparm *parm)
1312 {
1313 struct v4l2_subdev *sd = soc_camera_to_subdev(icd);
1314 return v4l2_subdev_call(sd, video, s_parm, parm);
1315 }
1316
1317 static int default_enum_framesizes(struct soc_camera_device *icd,
1318 struct v4l2_frmsizeenum *fsize)
1319 {
1320 int ret;
1321 struct v4l2_subdev *sd = soc_camera_to_subdev(icd);
1322 const struct soc_camera_format_xlate *xlate;
1323 __u32 pixfmt = fsize->pixel_format;
1324 struct v4l2_frmsizeenum fsize_mbus = *fsize;
1325
1326 xlate = soc_camera_xlate_by_fourcc(icd, pixfmt);
1327 if (!xlate)
1328 return -EINVAL;
1329 /* map xlate-code to pixel_format, sensor only handle xlate-code*/
1330 fsize_mbus.pixel_format = xlate->code;
1331
1332 ret = v4l2_subdev_call(sd, video, enum_framesizes, &fsize_mbus);
1333 if (ret < 0)
1334 return ret;
1335
1336 *fsize = fsize_mbus;
1337 fsize->pixel_format = pixfmt;
1338
1339 return 0;
1340 }
1341
1342 int soc_camera_host_register(struct soc_camera_host *ici)
1343 {
1344 struct soc_camera_host *ix;
1345 int ret;
1346
1347 if (!ici || !ici->ops ||
1348 !ici->ops->try_fmt ||
1349 !ici->ops->set_fmt ||
1350 !ici->ops->set_bus_param ||
1351 !ici->ops->querycap ||
1352 ((!ici->ops->init_videobuf ||
1353 !ici->ops->reqbufs) &&
1354 !ici->ops->init_videobuf2) ||
1355 !ici->ops->add ||
1356 !ici->ops->remove ||
1357 !ici->ops->poll ||
1358 !ici->v4l2_dev.dev)
1359 return -EINVAL;
1360
1361 if (!ici->ops->set_crop)
1362 ici->ops->set_crop = default_s_crop;
1363 if (!ici->ops->get_crop)
1364 ici->ops->get_crop = default_g_crop;
1365 if (!ici->ops->cropcap)
1366 ici->ops->cropcap = default_cropcap;
1367 if (!ici->ops->set_parm)
1368 ici->ops->set_parm = default_s_parm;
1369 if (!ici->ops->get_parm)
1370 ici->ops->get_parm = default_g_parm;
1371 if (!ici->ops->enum_framesizes)
1372 ici->ops->enum_framesizes = default_enum_framesizes;
1373
1374 mutex_lock(&list_lock);
1375 list_for_each_entry(ix, &hosts, list) {
1376 if (ix->nr == ici->nr) {
1377 ret = -EBUSY;
1378 goto edevreg;
1379 }
1380 }
1381
1382 ret = v4l2_device_register(ici->v4l2_dev.dev, &ici->v4l2_dev);
1383 if (ret < 0)
1384 goto edevreg;
1385
1386 list_add_tail(&ici->list, &hosts);
1387 mutex_unlock(&list_lock);
1388
1389 mutex_init(&ici->host_lock);
1390 scan_add_host(ici);
1391
1392 return 0;
1393
1394 edevreg:
1395 mutex_unlock(&list_lock);
1396 return ret;
1397 }
1398 EXPORT_SYMBOL(soc_camera_host_register);
1399
1400 /* Unregister all clients! */
1401 void soc_camera_host_unregister(struct soc_camera_host *ici)
1402 {
1403 struct soc_camera_device *icd;
1404
1405 mutex_lock(&list_lock);
1406
1407 list_del(&ici->list);
1408 list_for_each_entry(icd, &devices, list)
1409 if (icd->iface == ici->nr && to_soc_camera_control(icd))
1410 soc_camera_remove(icd);
1411
1412 mutex_unlock(&list_lock);
1413
1414 v4l2_device_unregister(&ici->v4l2_dev);
1415 }
1416 EXPORT_SYMBOL(soc_camera_host_unregister);
1417
1418 /* Image capture device */
1419 static int soc_camera_device_register(struct soc_camera_device *icd)
1420 {
1421 struct soc_camera_device *ix;
1422 int num = -1, i;
1423
1424 for (i = 0; i < 256 && num < 0; i++) {
1425 num = i;
1426 /* Check if this index is available on this interface */
1427 list_for_each_entry(ix, &devices, list) {
1428 if (ix->iface == icd->iface && ix->devnum == i) {
1429 num = -1;
1430 break;
1431 }
1432 }
1433 }
1434
1435 if (num < 0)
1436 /*
1437 * ok, we have 256 cameras on this host...
1438 * man, stay reasonable...
1439 */
1440 return -ENOMEM;
1441
1442 icd->devnum = num;
1443 icd->use_count = 0;
1444 icd->host_priv = NULL;
1445 mutex_init(&icd->video_lock);
1446
1447 list_add_tail(&icd->list, &devices);
1448
1449 return 0;
1450 }
1451
1452 static const struct v4l2_ioctl_ops soc_camera_ioctl_ops = {
1453 .vidioc_querycap = soc_camera_querycap,
1454 .vidioc_try_fmt_vid_cap = soc_camera_try_fmt_vid_cap,
1455 .vidioc_g_fmt_vid_cap = soc_camera_g_fmt_vid_cap,
1456 .vidioc_s_fmt_vid_cap = soc_camera_s_fmt_vid_cap,
1457 .vidioc_enum_fmt_vid_cap = soc_camera_enum_fmt_vid_cap,
1458 .vidioc_enum_input = soc_camera_enum_input,
1459 .vidioc_g_input = soc_camera_g_input,
1460 .vidioc_s_input = soc_camera_s_input,
1461 .vidioc_s_std = soc_camera_s_std,
1462 .vidioc_g_std = soc_camera_g_std,
1463 .vidioc_enum_framesizes = soc_camera_enum_framesizes,
1464 .vidioc_reqbufs = soc_camera_reqbufs,
1465 .vidioc_querybuf = soc_camera_querybuf,
1466 .vidioc_qbuf = soc_camera_qbuf,
1467 .vidioc_dqbuf = soc_camera_dqbuf,
1468 .vidioc_create_bufs = soc_camera_create_bufs,
1469 .vidioc_prepare_buf = soc_camera_prepare_buf,
1470 .vidioc_streamon = soc_camera_streamon,
1471 .vidioc_streamoff = soc_camera_streamoff,
1472 .vidioc_cropcap = soc_camera_cropcap,
1473 .vidioc_g_crop = soc_camera_g_crop,
1474 .vidioc_s_crop = soc_camera_s_crop,
1475 .vidioc_g_selection = soc_camera_g_selection,
1476 .vidioc_s_selection = soc_camera_s_selection,
1477 .vidioc_g_parm = soc_camera_g_parm,
1478 .vidioc_s_parm = soc_camera_s_parm,
1479 .vidioc_g_chip_ident = soc_camera_g_chip_ident,
1480 #ifdef CONFIG_VIDEO_ADV_DEBUG
1481 .vidioc_g_register = soc_camera_g_register,
1482 .vidioc_s_register = soc_camera_s_register,
1483 #endif
1484 };
1485
1486 static int video_dev_create(struct soc_camera_device *icd)
1487 {
1488 struct soc_camera_host *ici = to_soc_camera_host(icd->parent);
1489 struct video_device *vdev = video_device_alloc();
1490
1491 if (!vdev)
1492 return -ENOMEM;
1493
1494 strlcpy(vdev->name, ici->drv_name, sizeof(vdev->name));
1495
1496 vdev->parent = icd->pdev;
1497 vdev->current_norm = V4L2_STD_UNKNOWN;
1498 vdev->fops = &soc_camera_fops;
1499 vdev->ioctl_ops = &soc_camera_ioctl_ops;
1500 vdev->release = video_device_release;
1501 vdev->tvnorms = V4L2_STD_UNKNOWN;
1502 vdev->ctrl_handler = &icd->ctrl_handler;
1503 vdev->lock = &icd->video_lock;
1504
1505 icd->vdev = vdev;
1506
1507 return 0;
1508 }
1509
1510 /*
1511 * Called from soc_camera_probe() above (with .video_lock held???)
1512 */
1513 static int soc_camera_video_start(struct soc_camera_device *icd)
1514 {
1515 const struct device_type *type = icd->vdev->dev.type;
1516 int ret;
1517
1518 if (!icd->parent)
1519 return -ENODEV;
1520
1521 ret = video_register_device(icd->vdev, VFL_TYPE_GRABBER, -1);
1522 if (ret < 0) {
1523 dev_err(icd->pdev, "video_register_device failed: %d\n", ret);
1524 return ret;
1525 }
1526
1527 /* Restore device type, possibly set by the subdevice driver */
1528 icd->vdev->dev.type = type;
1529
1530 return 0;
1531 }
1532
1533 static int __devinit soc_camera_pdrv_probe(struct platform_device *pdev)
1534 {
1535 struct soc_camera_link *icl = pdev->dev.platform_data;
1536 struct soc_camera_device *icd;
1537
1538 if (!icl)
1539 return -EINVAL;
1540
1541 icd = devm_kzalloc(&pdev->dev, sizeof(*icd), GFP_KERNEL);
1542 if (!icd)
1543 return -ENOMEM;
1544
1545 icd->iface = icl->bus_id;
1546 icd->link = icl;
1547 icd->pdev = &pdev->dev;
1548 platform_set_drvdata(pdev, icd);
1549
1550 icd->user_width = DEFAULT_WIDTH;
1551 icd->user_height = DEFAULT_HEIGHT;
1552
1553 return soc_camera_device_register(icd);
1554 }
1555
1556 /*
1557 * Only called on rmmod for each platform device, since they are not
1558 * hot-pluggable. Now we know, that all our users - hosts and devices have
1559 * been unloaded already
1560 */
1561 static int __devexit soc_camera_pdrv_remove(struct platform_device *pdev)
1562 {
1563 struct soc_camera_device *icd = platform_get_drvdata(pdev);
1564
1565 if (!icd)
1566 return -EINVAL;
1567
1568 list_del(&icd->list);
1569
1570 return 0;
1571 }
1572
1573 static struct platform_driver __refdata soc_camera_pdrv = {
1574 .probe = soc_camera_pdrv_probe,
1575 .remove = __devexit_p(soc_camera_pdrv_remove),
1576 .driver = {
1577 .name = "soc-camera-pdrv",
1578 .owner = THIS_MODULE,
1579 },
1580 };
1581
1582 module_platform_driver(soc_camera_pdrv);
1583
1584 MODULE_DESCRIPTION("Image capture bus driver");
1585 MODULE_AUTHOR("Guennadi Liakhovetski <kernel@pengutronix.de>");
1586 MODULE_LICENSE("GPL");
1587 MODULE_ALIAS("platform:soc-camera-pdrv");
kernel source for telekom puls (alcatel/mediatek)