Version:  2.0.40 2.2.26 2.4.37 3.2 3.3 3.4 3.5 3.6 3.7 3.8 3.9 3.10 3.11 3.12 3.13 3.14 3.15 3.16 3.17 3.18

Linux/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/module.h>
 25 #include <linux/mutex.h>
 26 #include <linux/platform_device.h>
 27 #include <linux/pm_runtime.h>
 28 #include <linux/regulator/consumer.h>
 29 #include <linux/slab.h>
 30 #include <linux/vmalloc.h>
 31 
 32 #include <media/soc_camera.h>
 33 #include <media/soc_mediabus.h>
 34 #include <media/v4l2-async.h>
 35 #include <media/v4l2-clk.h>
 36 #include <media/v4l2-common.h>
 37 #include <media/v4l2-ioctl.h>
 38 #include <media/v4l2-dev.h>
 39 #include <media/v4l2-of.h>
 40 #include <media/videobuf-core.h>
 41 #include <media/videobuf2-core.h>
 42 
 43 /* Default to VGA resolution */
 44 #define DEFAULT_WIDTH   640
 45 #define DEFAULT_HEIGHT  480
 46 
 47 #define is_streaming(ici, icd)                          \
 48         (((ici)->ops->init_videobuf) ?                  \
 49          (icd)->vb_vidq.streaming :                     \
 50          vb2_is_streaming(&(icd)->vb2_vidq))
 51 
 52 #define MAP_MAX_NUM 32
 53 static DECLARE_BITMAP(device_map, MAP_MAX_NUM);
 54 static LIST_HEAD(hosts);
 55 static LIST_HEAD(devices);
 56 /*
 57  * Protects lists and bitmaps of hosts and devices.
 58  * Lock nesting: Ok to take ->host_lock under list_lock.
 59  */
 60 static DEFINE_MUTEX(list_lock);
 61 
 62 struct soc_camera_async_client {
 63         struct v4l2_async_subdev *sensor;
 64         struct v4l2_async_notifier notifier;
 65         struct platform_device *pdev;
 66         struct list_head list;          /* needed for clean up */
 67 };
 68 
 69 static int soc_camera_video_start(struct soc_camera_device *icd);
 70 static int video_dev_create(struct soc_camera_device *icd);
 71 
 72 int soc_camera_power_on(struct device *dev, struct soc_camera_subdev_desc *ssdd,
 73                         struct v4l2_clk *clk)
 74 {
 75         int ret;
 76         bool clock_toggle;
 77 
 78         if (clk && (!ssdd->unbalanced_power ||
 79                     !test_and_set_bit(0, &ssdd->clock_state))) {
 80                 ret = v4l2_clk_enable(clk);
 81                 if (ret < 0) {
 82                         dev_err(dev, "Cannot enable clock: %d\n", ret);
 83                         return ret;
 84                 }
 85                 clock_toggle = true;
 86         } else {
 87                 clock_toggle = false;
 88         }
 89 
 90         ret = regulator_bulk_enable(ssdd->sd_pdata.num_regulators,
 91                                     ssdd->sd_pdata.regulators);
 92         if (ret < 0) {
 93                 dev_err(dev, "Cannot enable regulators\n");
 94                 goto eregenable;
 95         }
 96 
 97         if (ssdd->power) {
 98                 ret = ssdd->power(dev, 1);
 99                 if (ret < 0) {
100                         dev_err(dev,
101                                 "Platform failed to power-on the camera.\n");
102                         goto epwron;
103                 }
104         }
105 
106         return 0;
107 
108 epwron:
109         regulator_bulk_disable(ssdd->sd_pdata.num_regulators,
110                                ssdd->sd_pdata.regulators);
111 eregenable:
112         if (clock_toggle)
113                 v4l2_clk_disable(clk);
114 
115         return ret;
116 }
117 EXPORT_SYMBOL(soc_camera_power_on);
118 
119 int soc_camera_power_off(struct device *dev, struct soc_camera_subdev_desc *ssdd,
120                          struct v4l2_clk *clk)
121 {
122         int ret = 0;
123         int err;
124 
125         if (ssdd->power) {
126                 err = ssdd->power(dev, 0);
127                 if (err < 0) {
128                         dev_err(dev,
129                                 "Platform failed to power-off the camera.\n");
130                         ret = err;
131                 }
132         }
133 
134         err = regulator_bulk_disable(ssdd->sd_pdata.num_regulators,
135                                      ssdd->sd_pdata.regulators);
136         if (err < 0) {
137                 dev_err(dev, "Cannot disable regulators\n");
138                 ret = ret ? : err;
139         }
140 
141         if (clk && (!ssdd->unbalanced_power || test_and_clear_bit(0, &ssdd->clock_state)))
142                 v4l2_clk_disable(clk);
143 
144         return ret;
145 }
146 EXPORT_SYMBOL(soc_camera_power_off);
147 
148 int soc_camera_power_init(struct device *dev, struct soc_camera_subdev_desc *ssdd)
149 {
150         /* Should not have any effect in synchronous case */
151         return devm_regulator_bulk_get(dev, ssdd->sd_pdata.num_regulators,
152                                        ssdd->sd_pdata.regulators);
153 }
154 EXPORT_SYMBOL(soc_camera_power_init);
155 
156 static int __soc_camera_power_on(struct soc_camera_device *icd)
157 {
158         struct v4l2_subdev *sd = soc_camera_to_subdev(icd);
159         int ret;
160 
161         ret = v4l2_subdev_call(sd, core, s_power, 1);
162         if (ret < 0 && ret != -ENOIOCTLCMD && ret != -ENODEV)
163                 return ret;
164 
165         return 0;
166 }
167 
168 static int __soc_camera_power_off(struct soc_camera_device *icd)
169 {
170         struct v4l2_subdev *sd = soc_camera_to_subdev(icd);
171         int ret;
172 
173         ret = v4l2_subdev_call(sd, core, s_power, 0);
174         if (ret < 0 && ret != -ENOIOCTLCMD && ret != -ENODEV)
175                 return ret;
176 
177         return 0;
178 }
179 
180 const struct soc_camera_format_xlate *soc_camera_xlate_by_fourcc(
181         struct soc_camera_device *icd, unsigned int fourcc)
182 {
183         unsigned int i;
184 
185         for (i = 0; i < icd->num_user_formats; i++)
186                 if (icd->user_formats[i].host_fmt->fourcc == fourcc)
187                         return icd->user_formats + i;
188         return NULL;
189 }
190 EXPORT_SYMBOL(soc_camera_xlate_by_fourcc);
191 
192 /**
193  * soc_camera_apply_board_flags() - apply platform SOCAM_SENSOR_INVERT_* flags
194  * @ssdd:       camera platform parameters
195  * @cfg:        media bus configuration
196  * @return:     resulting flags
197  */
198 unsigned long soc_camera_apply_board_flags(struct soc_camera_subdev_desc *ssdd,
199                                            const struct v4l2_mbus_config *cfg)
200 {
201         unsigned long f, flags = cfg->flags;
202 
203         /* If only one of the two polarities is supported, switch to the opposite */
204         if (ssdd->flags & SOCAM_SENSOR_INVERT_HSYNC) {
205                 f = flags & (V4L2_MBUS_HSYNC_ACTIVE_HIGH | V4L2_MBUS_HSYNC_ACTIVE_LOW);
206                 if (f == V4L2_MBUS_HSYNC_ACTIVE_HIGH || f == V4L2_MBUS_HSYNC_ACTIVE_LOW)
207                         flags ^= V4L2_MBUS_HSYNC_ACTIVE_HIGH | V4L2_MBUS_HSYNC_ACTIVE_LOW;
208         }
209 
210         if (ssdd->flags & SOCAM_SENSOR_INVERT_VSYNC) {
211                 f = flags & (V4L2_MBUS_VSYNC_ACTIVE_HIGH | V4L2_MBUS_VSYNC_ACTIVE_LOW);
212                 if (f == V4L2_MBUS_VSYNC_ACTIVE_HIGH || f == V4L2_MBUS_VSYNC_ACTIVE_LOW)
213                         flags ^= V4L2_MBUS_VSYNC_ACTIVE_HIGH | V4L2_MBUS_VSYNC_ACTIVE_LOW;
214         }
215 
216         if (ssdd->flags & SOCAM_SENSOR_INVERT_PCLK) {
217                 f = flags & (V4L2_MBUS_PCLK_SAMPLE_RISING | V4L2_MBUS_PCLK_SAMPLE_FALLING);
218                 if (f == V4L2_MBUS_PCLK_SAMPLE_RISING || f == V4L2_MBUS_PCLK_SAMPLE_FALLING)
219                         flags ^= V4L2_MBUS_PCLK_SAMPLE_RISING | V4L2_MBUS_PCLK_SAMPLE_FALLING;
220         }
221 
222         return flags;
223 }
224 EXPORT_SYMBOL(soc_camera_apply_board_flags);
225 
226 #define pixfmtstr(x) (x) & 0xff, ((x) >> 8) & 0xff, ((x) >> 16) & 0xff, \
227         ((x) >> 24) & 0xff
228 
229 static int soc_camera_try_fmt(struct soc_camera_device *icd,
230                               struct v4l2_format *f)
231 {
232         struct soc_camera_host *ici = to_soc_camera_host(icd->parent);
233         const struct soc_camera_format_xlate *xlate;
234         struct v4l2_pix_format *pix = &f->fmt.pix;
235         int ret;
236 
237         dev_dbg(icd->pdev, "TRY_FMT(%c%c%c%c, %ux%u)\n",
238                 pixfmtstr(pix->pixelformat), pix->width, pix->height);
239 
240         if (pix->pixelformat != V4L2_PIX_FMT_JPEG &&
241             !(ici->capabilities & SOCAM_HOST_CAP_STRIDE)) {
242                 pix->bytesperline = 0;
243                 pix->sizeimage = 0;
244         }
245 
246         ret = ici->ops->try_fmt(icd, f);
247         if (ret < 0)
248                 return ret;
249 
250         xlate = soc_camera_xlate_by_fourcc(icd, pix->pixelformat);
251         if (!xlate)
252                 return -EINVAL;
253 
254         ret = soc_mbus_bytes_per_line(pix->width, xlate->host_fmt);
255         if (ret < 0)
256                 return ret;
257 
258         pix->bytesperline = max_t(u32, pix->bytesperline, ret);
259 
260         ret = soc_mbus_image_size(xlate->host_fmt, pix->bytesperline,
261                                   pix->height);
262         if (ret < 0)
263                 return ret;
264 
265         pix->sizeimage = max_t(u32, pix->sizeimage, ret);
266 
267         return 0;
268 }
269 
270 static int soc_camera_try_fmt_vid_cap(struct file *file, void *priv,
271                                       struct v4l2_format *f)
272 {
273         struct soc_camera_device *icd = file->private_data;
274 
275         WARN_ON(priv != file->private_data);
276 
277         /* Only single-plane capture is supported so far */
278         if (f->type != V4L2_BUF_TYPE_VIDEO_CAPTURE)
279                 return -EINVAL;
280 
281         /* limit format to hardware capabilities */
282         return soc_camera_try_fmt(icd, f);
283 }
284 
285 static int soc_camera_enum_input(struct file *file, void *priv,
286                                  struct v4l2_input *inp)
287 {
288         if (inp->index != 0)
289                 return -EINVAL;
290 
291         /* default is camera */
292         inp->type = V4L2_INPUT_TYPE_CAMERA;
293         strcpy(inp->name, "Camera");
294 
295         return 0;
296 }
297 
298 static int soc_camera_g_input(struct file *file, void *priv, unsigned int *i)
299 {
300         *i = 0;
301 
302         return 0;
303 }
304 
305 static int soc_camera_s_input(struct file *file, void *priv, unsigned int i)
306 {
307         if (i > 0)
308                 return -EINVAL;
309 
310         return 0;
311 }
312 
313 static int soc_camera_s_std(struct file *file, void *priv, v4l2_std_id a)
314 {
315         struct soc_camera_device *icd = file->private_data;
316         struct v4l2_subdev *sd = soc_camera_to_subdev(icd);
317 
318         return v4l2_subdev_call(sd, video, s_std, a);
319 }
320 
321 static int soc_camera_g_std(struct file *file, void *priv, v4l2_std_id *a)
322 {
323         struct soc_camera_device *icd = file->private_data;
324         struct v4l2_subdev *sd = soc_camera_to_subdev(icd);
325 
326         return v4l2_subdev_call(sd, video, g_std, a);
327 }
328 
329 static int soc_camera_enum_framesizes(struct file *file, void *fh,
330                                          struct v4l2_frmsizeenum *fsize)
331 {
332         struct soc_camera_device *icd = file->private_data;
333         struct soc_camera_host *ici = to_soc_camera_host(icd->parent);
334 
335         return ici->ops->enum_framesizes(icd, fsize);
336 }
337 
338 static int soc_camera_reqbufs(struct file *file, void *priv,
339                               struct v4l2_requestbuffers *p)
340 {
341         int ret;
342         struct soc_camera_device *icd = file->private_data;
343         struct soc_camera_host *ici = to_soc_camera_host(icd->parent);
344 
345         WARN_ON(priv != file->private_data);
346 
347         if (icd->streamer && icd->streamer != file)
348                 return -EBUSY;
349 
350         if (ici->ops->init_videobuf) {
351                 ret = videobuf_reqbufs(&icd->vb_vidq, p);
352                 if (ret < 0)
353                         return ret;
354 
355                 ret = ici->ops->reqbufs(icd, p);
356         } else {
357                 ret = vb2_reqbufs(&icd->vb2_vidq, p);
358         }
359 
360         if (!ret && !icd->streamer)
361                 icd->streamer = file;
362 
363         return ret;
364 }
365 
366 static int soc_camera_querybuf(struct file *file, void *priv,
367                                struct v4l2_buffer *p)
368 {
369         struct soc_camera_device *icd = file->private_data;
370         struct soc_camera_host *ici = to_soc_camera_host(icd->parent);
371 
372         WARN_ON(priv != file->private_data);
373 
374         if (ici->ops->init_videobuf)
375                 return videobuf_querybuf(&icd->vb_vidq, p);
376         else
377                 return vb2_querybuf(&icd->vb2_vidq, p);
378 }
379 
380 static int soc_camera_qbuf(struct file *file, void *priv,
381                            struct v4l2_buffer *p)
382 {
383         struct soc_camera_device *icd = file->private_data;
384         struct soc_camera_host *ici = to_soc_camera_host(icd->parent);
385 
386         WARN_ON(priv != file->private_data);
387 
388         if (icd->streamer != file)
389                 return -EBUSY;
390 
391         if (ici->ops->init_videobuf)
392                 return videobuf_qbuf(&icd->vb_vidq, p);
393         else
394                 return vb2_qbuf(&icd->vb2_vidq, p);
395 }
396 
397 static int soc_camera_dqbuf(struct file *file, void *priv,
398                             struct v4l2_buffer *p)
399 {
400         struct soc_camera_device *icd = file->private_data;
401         struct soc_camera_host *ici = to_soc_camera_host(icd->parent);
402 
403         WARN_ON(priv != file->private_data);
404 
405         if (icd->streamer != file)
406                 return -EBUSY;
407 
408         if (ici->ops->init_videobuf)
409                 return videobuf_dqbuf(&icd->vb_vidq, p, file->f_flags & O_NONBLOCK);
410         else
411                 return vb2_dqbuf(&icd->vb2_vidq, p, file->f_flags & O_NONBLOCK);
412 }
413 
414 static int soc_camera_create_bufs(struct file *file, void *priv,
415                             struct v4l2_create_buffers *create)
416 {
417         struct soc_camera_device *icd = file->private_data;
418         struct soc_camera_host *ici = to_soc_camera_host(icd->parent);
419 
420         /* videobuf2 only */
421         if (ici->ops->init_videobuf)
422                 return -EINVAL;
423         else
424                 return vb2_create_bufs(&icd->vb2_vidq, create);
425 }
426 
427 static int soc_camera_prepare_buf(struct file *file, void *priv,
428                                   struct v4l2_buffer *b)
429 {
430         struct soc_camera_device *icd = file->private_data;
431         struct soc_camera_host *ici = to_soc_camera_host(icd->parent);
432 
433         /* videobuf2 only */
434         if (ici->ops->init_videobuf)
435                 return -EINVAL;
436         else
437                 return vb2_prepare_buf(&icd->vb2_vidq, b);
438 }
439 
440 static int soc_camera_expbuf(struct file *file, void *priv,
441                              struct v4l2_exportbuffer *p)
442 {
443         struct soc_camera_device *icd = file->private_data;
444         struct soc_camera_host *ici = to_soc_camera_host(icd->parent);
445 
446         if (icd->streamer != file)
447                 return -EBUSY;
448 
449         /* videobuf2 only */
450         if (ici->ops->init_videobuf)
451                 return -EINVAL;
452         else
453                 return vb2_expbuf(&icd->vb2_vidq, p);
454 }
455 
456 /* Always entered with .host_lock held */
457 static int soc_camera_init_user_formats(struct soc_camera_device *icd)
458 {
459         struct v4l2_subdev *sd = soc_camera_to_subdev(icd);
460         struct soc_camera_host *ici = to_soc_camera_host(icd->parent);
461         unsigned int i, fmts = 0, raw_fmts = 0;
462         int ret;
463         enum v4l2_mbus_pixelcode code;
464 
465         while (!v4l2_subdev_call(sd, video, enum_mbus_fmt, raw_fmts, &code))
466                 raw_fmts++;
467 
468         if (!ici->ops->get_formats)
469                 /*
470                  * Fallback mode - the host will have to serve all
471                  * sensor-provided formats one-to-one to the user
472                  */
473                 fmts = raw_fmts;
474         else
475                 /*
476                  * First pass - only count formats this host-sensor
477                  * configuration can provide
478                  */
479                 for (i = 0; i < raw_fmts; i++) {
480                         ret = ici->ops->get_formats(icd, i, NULL);
481                         if (ret < 0)
482                                 return ret;
483                         fmts += ret;
484                 }
485 
486         if (!fmts)
487                 return -ENXIO;
488 
489         icd->user_formats =
490                 vmalloc(fmts * sizeof(struct soc_camera_format_xlate));
491         if (!icd->user_formats)
492                 return -ENOMEM;
493 
494         dev_dbg(icd->pdev, "Found %d supported formats.\n", fmts);
495 
496         /* Second pass - actually fill data formats */
497         fmts = 0;
498         for (i = 0; i < raw_fmts; i++)
499                 if (!ici->ops->get_formats) {
500                         v4l2_subdev_call(sd, video, enum_mbus_fmt, i, &code);
501                         icd->user_formats[fmts].host_fmt =
502                                 soc_mbus_get_fmtdesc(code);
503                         if (icd->user_formats[fmts].host_fmt)
504                                 icd->user_formats[fmts++].code = code;
505                 } else {
506                         ret = ici->ops->get_formats(icd, i,
507                                                     &icd->user_formats[fmts]);
508                         if (ret < 0)
509                                 goto egfmt;
510                         fmts += ret;
511                 }
512 
513         icd->num_user_formats = fmts;
514         icd->current_fmt = &icd->user_formats[0];
515 
516         return 0;
517 
518 egfmt:
519         vfree(icd->user_formats);
520         return ret;
521 }
522 
523 /* Always entered with .host_lock held */
524 static void soc_camera_free_user_formats(struct soc_camera_device *icd)
525 {
526         struct soc_camera_host *ici = to_soc_camera_host(icd->parent);
527 
528         if (ici->ops->put_formats)
529                 ici->ops->put_formats(icd);
530         icd->current_fmt = NULL;
531         icd->num_user_formats = 0;
532         vfree(icd->user_formats);
533         icd->user_formats = NULL;
534 }
535 
536 /* Called with .vb_lock held, or from the first open(2), see comment there */
537 static int soc_camera_set_fmt(struct soc_camera_device *icd,
538                               struct v4l2_format *f)
539 {
540         struct soc_camera_host *ici = to_soc_camera_host(icd->parent);
541         struct v4l2_pix_format *pix = &f->fmt.pix;
542         int ret;
543 
544         dev_dbg(icd->pdev, "S_FMT(%c%c%c%c, %ux%u)\n",
545                 pixfmtstr(pix->pixelformat), pix->width, pix->height);
546 
547         /* We always call try_fmt() before set_fmt() or set_crop() */
548         ret = soc_camera_try_fmt(icd, f);
549         if (ret < 0)
550                 return ret;
551 
552         ret = ici->ops->set_fmt(icd, f);
553         if (ret < 0) {
554                 return ret;
555         } else if (!icd->current_fmt ||
556                    icd->current_fmt->host_fmt->fourcc != pix->pixelformat) {
557                 dev_err(icd->pdev,
558                         "Host driver hasn't set up current format correctly!\n");
559                 return -EINVAL;
560         }
561 
562         icd->user_width         = pix->width;
563         icd->user_height        = pix->height;
564         icd->bytesperline       = pix->bytesperline;
565         icd->sizeimage          = pix->sizeimage;
566         icd->colorspace         = pix->colorspace;
567         icd->field              = pix->field;
568         if (ici->ops->init_videobuf)
569                 icd->vb_vidq.field = pix->field;
570 
571         dev_dbg(icd->pdev, "set width: %d height: %d\n",
572                 icd->user_width, icd->user_height);
573 
574         /* set physical bus parameters */
575         return ici->ops->set_bus_param(icd);
576 }
577 
578 static int soc_camera_add_device(struct soc_camera_device *icd)
579 {
580         struct soc_camera_host *ici = to_soc_camera_host(icd->parent);
581         int ret;
582 
583         if (ici->icd)
584                 return -EBUSY;
585 
586         if (!icd->clk) {
587                 mutex_lock(&ici->clk_lock);
588                 ret = ici->ops->clock_start(ici);
589                 mutex_unlock(&ici->clk_lock);
590                 if (ret < 0)
591                         return ret;
592         }
593 
594         if (ici->ops->add) {
595                 ret = ici->ops->add(icd);
596                 if (ret < 0)
597                         goto eadd;
598         }
599 
600         ici->icd = icd;
601 
602         return 0;
603 
604 eadd:
605         if (!icd->clk) {
606                 mutex_lock(&ici->clk_lock);
607                 ici->ops->clock_stop(ici);
608                 mutex_unlock(&ici->clk_lock);
609         }
610         return ret;
611 }
612 
613 static void soc_camera_remove_device(struct soc_camera_device *icd)
614 {
615         struct soc_camera_host *ici = to_soc_camera_host(icd->parent);
616 
617         if (WARN_ON(icd != ici->icd))
618                 return;
619 
620         if (ici->ops->remove)
621                 ici->ops->remove(icd);
622         if (!icd->clk) {
623                 mutex_lock(&ici->clk_lock);
624                 ici->ops->clock_stop(ici);
625                 mutex_unlock(&ici->clk_lock);
626         }
627         ici->icd = NULL;
628 }
629 
630 static int soc_camera_open(struct file *file)
631 {
632         struct video_device *vdev = video_devdata(file);
633         struct soc_camera_device *icd;
634         struct soc_camera_host *ici;
635         int ret;
636 
637         /*
638          * Don't mess with the host during probe: wait until the loop in
639          * scan_add_host() completes. Also protect against a race with
640          * soc_camera_host_unregister().
641          */
642         if (mutex_lock_interruptible(&list_lock))
643                 return -ERESTARTSYS;
644 
645         if (!vdev || !video_is_registered(vdev)) {
646                 mutex_unlock(&list_lock);
647                 return -ENODEV;
648         }
649 
650         icd = video_get_drvdata(vdev);
651         ici = to_soc_camera_host(icd->parent);
652 
653         ret = try_module_get(ici->ops->owner) ? 0 : -ENODEV;
654         mutex_unlock(&list_lock);
655 
656         if (ret < 0) {
657                 dev_err(icd->pdev, "Couldn't lock capture bus driver.\n");
658                 return ret;
659         }
660 
661         if (!to_soc_camera_control(icd)) {
662                 /* No device driver attached */
663                 ret = -ENODEV;
664                 goto econtrol;
665         }
666 
667         if (mutex_lock_interruptible(&ici->host_lock)) {
668                 ret = -ERESTARTSYS;
669                 goto elockhost;
670         }
671         icd->use_count++;
672 
673         /* Now we really have to activate the camera */
674         if (icd->use_count == 1) {
675                 struct soc_camera_desc *sdesc = to_soc_camera_desc(icd);
676                 /* Restore parameters before the last close() per V4L2 API */
677                 struct v4l2_format f = {
678                         .type = V4L2_BUF_TYPE_VIDEO_CAPTURE,
679                         .fmt.pix = {
680                                 .width          = icd->user_width,
681                                 .height         = icd->user_height,
682                                 .field          = icd->field,
683                                 .colorspace     = icd->colorspace,
684                                 .pixelformat    =
685                                         icd->current_fmt->host_fmt->fourcc,
686                         },
687                 };
688 
689                 /* The camera could have been already on, try to reset */
690                 if (sdesc->subdev_desc.reset)
691                         sdesc->subdev_desc.reset(icd->pdev);
692 
693                 ret = soc_camera_add_device(icd);
694                 if (ret < 0) {
695                         dev_err(icd->pdev, "Couldn't activate the camera: %d\n", ret);
696                         goto eiciadd;
697                 }
698 
699                 ret = __soc_camera_power_on(icd);
700                 if (ret < 0)
701                         goto epower;
702 
703                 pm_runtime_enable(&icd->vdev->dev);
704                 ret = pm_runtime_resume(&icd->vdev->dev);
705                 if (ret < 0 && ret != -ENOSYS)
706                         goto eresume;
707 
708                 /*
709                  * Try to configure with default parameters. Notice: this is the
710                  * very first open, so, we cannot race against other calls,
711                  * apart from someone else calling open() simultaneously, but
712                  * .host_lock is protecting us against it.
713                  */
714                 ret = soc_camera_set_fmt(icd, &f);
715                 if (ret < 0)
716                         goto esfmt;
717 
718                 if (ici->ops->init_videobuf) {
719                         ici->ops->init_videobuf(&icd->vb_vidq, icd);
720                 } else {
721                         ret = ici->ops->init_videobuf2(&icd->vb2_vidq, icd);
722                         if (ret < 0)
723                                 goto einitvb;
724                 }
725                 v4l2_ctrl_handler_setup(&icd->ctrl_handler);
726         }
727         mutex_unlock(&ici->host_lock);
728 
729         file->private_data = icd;
730         dev_dbg(icd->pdev, "camera device open\n");
731 
732         return 0;
733 
734         /*
735          * All errors are entered with the .host_lock held, first four also
736          * with use_count == 1
737          */
738 einitvb:
739 esfmt:
740         pm_runtime_disable(&icd->vdev->dev);
741 eresume:
742         __soc_camera_power_off(icd);
743 epower:
744         soc_camera_remove_device(icd);
745 eiciadd:
746         icd->use_count--;
747         mutex_unlock(&ici->host_lock);
748 elockhost:
749 econtrol:
750         module_put(ici->ops->owner);
751 
752         return ret;
753 }
754 
755 static int soc_camera_close(struct file *file)
756 {
757         struct soc_camera_device *icd = file->private_data;
758         struct soc_camera_host *ici = to_soc_camera_host(icd->parent);
759 
760         mutex_lock(&ici->host_lock);
761         icd->use_count--;
762         if (!icd->use_count) {
763                 pm_runtime_suspend(&icd->vdev->dev);
764                 pm_runtime_disable(&icd->vdev->dev);
765 
766                 if (ici->ops->init_videobuf2)
767                         vb2_queue_release(&icd->vb2_vidq);
768                 __soc_camera_power_off(icd);
769 
770                 soc_camera_remove_device(icd);
771         }
772 
773         if (icd->streamer == file)
774                 icd->streamer = NULL;
775         mutex_unlock(&ici->host_lock);
776 
777         module_put(ici->ops->owner);
778 
779         dev_dbg(icd->pdev, "camera device close\n");
780 
781         return 0;
782 }
783 
784 static ssize_t soc_camera_read(struct file *file, char __user *buf,
785                                size_t count, loff_t *ppos)
786 {
787         struct soc_camera_device *icd = file->private_data;
788         struct soc_camera_host *ici = to_soc_camera_host(icd->parent);
789 
790         dev_dbg(icd->pdev, "read called, buf %p\n", buf);
791 
792         if (ici->ops->init_videobuf2 && icd->vb2_vidq.io_modes & VB2_READ)
793                 return vb2_read(&icd->vb2_vidq, buf, count, ppos,
794                                 file->f_flags & O_NONBLOCK);
795 
796         dev_err(icd->pdev, "camera device read not implemented\n");
797 
798         return -EINVAL;
799 }
800 
801 static int soc_camera_mmap(struct file *file, struct vm_area_struct *vma)
802 {
803         struct soc_camera_device *icd = file->private_data;
804         struct soc_camera_host *ici = to_soc_camera_host(icd->parent);
805         int err;
806 
807         dev_dbg(icd->pdev, "mmap called, vma=0x%08lx\n", (unsigned long)vma);
808 
809         if (icd->streamer != file)
810                 return -EBUSY;
811 
812         if (mutex_lock_interruptible(&ici->host_lock))
813                 return -ERESTARTSYS;
814         if (ici->ops->init_videobuf)
815                 err = videobuf_mmap_mapper(&icd->vb_vidq, vma);
816         else
817                 err = vb2_mmap(&icd->vb2_vidq, vma);
818         mutex_unlock(&ici->host_lock);
819 
820         dev_dbg(icd->pdev, "vma start=0x%08lx, size=%ld, ret=%d\n",
821                 (unsigned long)vma->vm_start,
822                 (unsigned long)vma->vm_end - (unsigned long)vma->vm_start,
823                 err);
824 
825         return err;
826 }
827 
828 static unsigned int soc_camera_poll(struct file *file, poll_table *pt)
829 {
830         struct soc_camera_device *icd = file->private_data;
831         struct soc_camera_host *ici = to_soc_camera_host(icd->parent);
832         unsigned res = POLLERR;
833 
834         if (icd->streamer != file)
835                 return POLLERR;
836 
837         mutex_lock(&ici->host_lock);
838         if (ici->ops->init_videobuf && list_empty(&icd->vb_vidq.stream))
839                 dev_err(icd->pdev, "Trying to poll with no queued buffers!\n");
840         else
841                 res = ici->ops->poll(file, pt);
842         mutex_unlock(&ici->host_lock);
843         return res;
844 }
845 
846 void soc_camera_lock(struct vb2_queue *vq)
847 {
848         struct soc_camera_device *icd = vb2_get_drv_priv(vq);
849         struct soc_camera_host *ici = to_soc_camera_host(icd->parent);
850         mutex_lock(&ici->host_lock);
851 }
852 EXPORT_SYMBOL(soc_camera_lock);
853 
854 void soc_camera_unlock(struct vb2_queue *vq)
855 {
856         struct soc_camera_device *icd = vb2_get_drv_priv(vq);
857         struct soc_camera_host *ici = to_soc_camera_host(icd->parent);
858         mutex_unlock(&ici->host_lock);
859 }
860 EXPORT_SYMBOL(soc_camera_unlock);
861 
862 static struct v4l2_file_operations soc_camera_fops = {
863         .owner          = THIS_MODULE,
864         .open           = soc_camera_open,
865         .release        = soc_camera_close,
866         .unlocked_ioctl = video_ioctl2,
867         .read           = soc_camera_read,
868         .mmap           = soc_camera_mmap,
869         .poll           = soc_camera_poll,
870 };
871 
872 static int soc_camera_s_fmt_vid_cap(struct file *file, void *priv,
873                                     struct v4l2_format *f)
874 {
875         struct soc_camera_device *icd = file->private_data;
876         int ret;
877 
878         WARN_ON(priv != file->private_data);
879 
880         if (f->type != V4L2_BUF_TYPE_VIDEO_CAPTURE) {
881                 dev_warn(icd->pdev, "Wrong buf-type %d\n", f->type);
882                 return -EINVAL;
883         }
884 
885         if (icd->streamer && icd->streamer != file)
886                 return -EBUSY;
887 
888         if (is_streaming(to_soc_camera_host(icd->parent), icd)) {
889                 dev_err(icd->pdev, "S_FMT denied: queue initialised\n");
890                 return -EBUSY;
891         }
892 
893         ret = soc_camera_set_fmt(icd, f);
894 
895         if (!ret && !icd->streamer)
896                 icd->streamer = file;
897 
898         return ret;
899 }
900 
901 static int soc_camera_enum_fmt_vid_cap(struct file *file, void  *priv,
902                                        struct v4l2_fmtdesc *f)
903 {
904         struct soc_camera_device *icd = file->private_data;
905         const struct soc_mbus_pixelfmt *format;
906 
907         WARN_ON(priv != file->private_data);
908 
909         if (f->index >= icd->num_user_formats)
910                 return -EINVAL;
911 
912         format = icd->user_formats[f->index].host_fmt;
913 
914         if (format->name)
915                 strlcpy(f->description, format->name, sizeof(f->description));
916         f->pixelformat = format->fourcc;
917         return 0;
918 }
919 
920 static int soc_camera_g_fmt_vid_cap(struct file *file, void *priv,
921                                     struct v4l2_format *f)
922 {
923         struct soc_camera_device *icd = file->private_data;
924         struct v4l2_pix_format *pix = &f->fmt.pix;
925 
926         WARN_ON(priv != file->private_data);
927 
928         if (f->type != V4L2_BUF_TYPE_VIDEO_CAPTURE)
929                 return -EINVAL;
930 
931         pix->width              = icd->user_width;
932         pix->height             = icd->user_height;
933         pix->bytesperline       = icd->bytesperline;
934         pix->sizeimage          = icd->sizeimage;
935         pix->field              = icd->field;
936         pix->pixelformat        = icd->current_fmt->host_fmt->fourcc;
937         pix->colorspace         = icd->colorspace;
938         dev_dbg(icd->pdev, "current_fmt->fourcc: 0x%08x\n",
939                 icd->current_fmt->host_fmt->fourcc);
940         return 0;
941 }
942 
943 static int soc_camera_querycap(struct file *file, void  *priv,
944                                struct v4l2_capability *cap)
945 {
946         struct soc_camera_device *icd = file->private_data;
947         struct soc_camera_host *ici = to_soc_camera_host(icd->parent);
948 
949         WARN_ON(priv != file->private_data);
950 
951         strlcpy(cap->driver, ici->drv_name, sizeof(cap->driver));
952         return ici->ops->querycap(ici, cap);
953 }
954 
955 static int soc_camera_streamon(struct file *file, void *priv,
956                                enum v4l2_buf_type i)
957 {
958         struct soc_camera_device *icd = file->private_data;
959         struct soc_camera_host *ici = to_soc_camera_host(icd->parent);
960         struct v4l2_subdev *sd = soc_camera_to_subdev(icd);
961         int ret;
962 
963         WARN_ON(priv != file->private_data);
964 
965         if (i != V4L2_BUF_TYPE_VIDEO_CAPTURE)
966                 return -EINVAL;
967 
968         if (icd->streamer != file)
969                 return -EBUSY;
970 
971         /* This calls buf_queue from host driver's videobuf_queue_ops */
972         if (ici->ops->init_videobuf)
973                 ret = videobuf_streamon(&icd->vb_vidq);
974         else
975                 ret = vb2_streamon(&icd->vb2_vidq, i);
976 
977         if (!ret)
978                 v4l2_subdev_call(sd, video, s_stream, 1);
979 
980         return ret;
981 }
982 
983 static int soc_camera_streamoff(struct file *file, void *priv,
984                                 enum v4l2_buf_type i)
985 {
986         struct soc_camera_device *icd = file->private_data;
987         struct v4l2_subdev *sd = soc_camera_to_subdev(icd);
988         struct soc_camera_host *ici = to_soc_camera_host(icd->parent);
989 
990         WARN_ON(priv != file->private_data);
991 
992         if (i != V4L2_BUF_TYPE_VIDEO_CAPTURE)
993                 return -EINVAL;
994 
995         if (icd->streamer != file)
996                 return -EBUSY;
997 
998         /*
999          * This calls buf_release from host driver's videobuf_queue_ops for all
1000          * remaining buffers. When the last buffer is freed, stop capture
1001          */
1002         if (ici->ops->init_videobuf)
1003                 videobuf_streamoff(&icd->vb_vidq);
1004         else
1005                 vb2_streamoff(&icd->vb2_vidq, i);
1006 
1007         v4l2_subdev_call(sd, video, s_stream, 0);
1008 
1009         return 0;
1010 }
1011 
1012 static int soc_camera_cropcap(struct file *file, void *fh,
1013                               struct v4l2_cropcap *a)
1014 {
1015         struct soc_camera_device *icd = file->private_data;
1016         struct soc_camera_host *ici = to_soc_camera_host(icd->parent);
1017 
1018         return ici->ops->cropcap(icd, a);
1019 }
1020 
1021 static int soc_camera_g_crop(struct file *file, void *fh,
1022                              struct v4l2_crop *a)
1023 {
1024         struct soc_camera_device *icd = file->private_data;
1025         struct soc_camera_host *ici = to_soc_camera_host(icd->parent);
1026         int ret;
1027 
1028         ret = ici->ops->get_crop(icd, a);
1029 
1030         return ret;
1031 }
1032 
1033 /*
1034  * According to the V4L2 API, drivers shall not update the struct v4l2_crop
1035  * argument with the actual geometry, instead, the user shall use G_CROP to
1036  * retrieve it.
1037  */
1038 static int soc_camera_s_crop(struct file *file, void *fh,
1039                              const struct v4l2_crop *a)
1040 {
1041         struct soc_camera_device *icd = file->private_data;
1042         struct soc_camera_host *ici = to_soc_camera_host(icd->parent);
1043         const struct v4l2_rect *rect = &a->c;
1044         struct v4l2_crop current_crop;
1045         int ret;
1046 
1047         if (a->type != V4L2_BUF_TYPE_VIDEO_CAPTURE)
1048                 return -EINVAL;
1049 
1050         dev_dbg(icd->pdev, "S_CROP(%ux%u@%u:%u)\n",
1051                 rect->width, rect->height, rect->left, rect->top);
1052 
1053         current_crop.type = a->type;
1054 
1055         /* If get_crop fails, we'll let host and / or client drivers decide */
1056         ret = ici->ops->get_crop(icd, &current_crop);
1057 
1058         /* Prohibit window size change with initialised buffers */
1059         if (ret < 0) {
1060                 dev_err(icd->pdev,
1061                         "S_CROP denied: getting current crop failed\n");
1062         } else if ((a->c.width == current_crop.c.width &&
1063                     a->c.height == current_crop.c.height) ||
1064                    !is_streaming(ici, icd)) {
1065                 /* same size or not streaming - use .set_crop() */
1066                 ret = ici->ops->set_crop(icd, a);
1067         } else if (ici->ops->set_livecrop) {
1068                 ret = ici->ops->set_livecrop(icd, a);
1069         } else {
1070                 dev_err(icd->pdev,
1071                         "S_CROP denied: queue initialised and sizes differ\n");
1072                 ret = -EBUSY;
1073         }
1074 
1075         return ret;
1076 }
1077 
1078 static int soc_camera_g_selection(struct file *file, void *fh,
1079                                   struct v4l2_selection *s)
1080 {
1081         struct soc_camera_device *icd = file->private_data;
1082         struct soc_camera_host *ici = to_soc_camera_host(icd->parent);
1083 
1084         /* With a wrong type no need to try to fall back to cropping */
1085         if (s->type != V4L2_BUF_TYPE_VIDEO_CAPTURE)
1086                 return -EINVAL;
1087 
1088         if (!ici->ops->get_selection)
1089                 return -ENOTTY;
1090 
1091         return ici->ops->get_selection(icd, s);
1092 }
1093 
1094 static int soc_camera_s_selection(struct file *file, void *fh,
1095                                   struct v4l2_selection *s)
1096 {
1097         struct soc_camera_device *icd = file->private_data;
1098         struct soc_camera_host *ici = to_soc_camera_host(icd->parent);
1099         int ret;
1100 
1101         /* In all these cases cropping emulation will not help */
1102         if (s->type != V4L2_BUF_TYPE_VIDEO_CAPTURE ||
1103             (s->target != V4L2_SEL_TGT_COMPOSE &&
1104              s->target != V4L2_SEL_TGT_CROP))
1105                 return -EINVAL;
1106 
1107         if (s->target == V4L2_SEL_TGT_COMPOSE) {
1108                 /* No output size change during a running capture! */
1109                 if (is_streaming(ici, icd) &&
1110                     (icd->user_width != s->r.width ||
1111                      icd->user_height != s->r.height))
1112                         return -EBUSY;
1113 
1114                 /*
1115                  * Only one user is allowed to change the output format, touch
1116                  * buffers, start / stop streaming, poll for data
1117                  */
1118                 if (icd->streamer && icd->streamer != file)
1119                         return -EBUSY;
1120         }
1121 
1122         if (!ici->ops->set_selection)
1123                 return -ENOTTY;
1124 
1125         ret = ici->ops->set_selection(icd, s);
1126         if (!ret &&
1127             s->target == V4L2_SEL_TGT_COMPOSE) {
1128                 icd->user_width = s->r.width;
1129                 icd->user_height = s->r.height;
1130                 if (!icd->streamer)
1131                         icd->streamer = file;
1132         }
1133 
1134         return ret;
1135 }
1136 
1137 static int soc_camera_g_parm(struct file *file, void *fh,
1138                              struct v4l2_streamparm *a)
1139 {
1140         struct soc_camera_device *icd = file->private_data;
1141         struct soc_camera_host *ici = to_soc_camera_host(icd->parent);
1142 
1143         if (ici->ops->get_parm)
1144                 return ici->ops->get_parm(icd, a);
1145 
1146         return -ENOIOCTLCMD;
1147 }
1148 
1149 static int soc_camera_s_parm(struct file *file, void *fh,
1150                              struct v4l2_streamparm *a)
1151 {
1152         struct soc_camera_device *icd = file->private_data;
1153         struct soc_camera_host *ici = to_soc_camera_host(icd->parent);
1154 
1155         if (ici->ops->set_parm)
1156                 return ici->ops->set_parm(icd, a);
1157 
1158         return -ENOIOCTLCMD;
1159 }
1160 
1161 static int soc_camera_probe(struct soc_camera_host *ici,
1162                             struct soc_camera_device *icd);
1163 
1164 /* So far this function cannot fail */
1165 static void scan_add_host(struct soc_camera_host *ici)
1166 {
1167         struct soc_camera_device *icd;
1168 
1169         mutex_lock(&list_lock);
1170 
1171         list_for_each_entry(icd, &devices, list)
1172                 if (icd->iface == ici->nr) {
1173                         struct soc_camera_desc *sdesc = to_soc_camera_desc(icd);
1174                         struct soc_camera_subdev_desc *ssdd = &sdesc->subdev_desc;
1175 
1176                         /* The camera could have been already on, try to reset */
1177                         if (ssdd->reset)
1178                                 ssdd->reset(icd->pdev);
1179 
1180                         icd->parent = ici->v4l2_dev.dev;
1181 
1182                         /* Ignore errors */
1183                         soc_camera_probe(ici, icd);
1184                 }
1185 
1186         mutex_unlock(&list_lock);
1187 }
1188 
1189 /*
1190  * It is invalid to call v4l2_clk_enable() after a successful probing
1191  * asynchronously outside of V4L2 operations, i.e. with .host_lock not held.
1192  */
1193 static int soc_camera_clk_enable(struct v4l2_clk *clk)
1194 {
1195         struct soc_camera_device *icd = clk->priv;
1196         struct soc_camera_host *ici;
1197         int ret;
1198 
1199         if (!icd || !icd->parent)
1200                 return -ENODEV;
1201 
1202         ici = to_soc_camera_host(icd->parent);
1203 
1204         if (!try_module_get(ici->ops->owner))
1205                 return -ENODEV;
1206 
1207         /*
1208          * If a different client is currently being probed, the host will tell
1209          * you to go
1210          */
1211         mutex_lock(&ici->clk_lock);
1212         ret = ici->ops->clock_start(ici);
1213         mutex_unlock(&ici->clk_lock);
1214         return ret;
1215 }
1216 
1217 static void soc_camera_clk_disable(struct v4l2_clk *clk)
1218 {
1219         struct soc_camera_device *icd = clk->priv;
1220         struct soc_camera_host *ici;
1221 
1222         if (!icd || !icd->parent)
1223                 return;
1224 
1225         ici = to_soc_camera_host(icd->parent);
1226 
1227         mutex_lock(&ici->clk_lock);
1228         ici->ops->clock_stop(ici);
1229         mutex_unlock(&ici->clk_lock);
1230 
1231         module_put(ici->ops->owner);
1232 }
1233 
1234 /*
1235  * Eventually, it would be more logical to make the respective host the clock
1236  * owner, but then we would have to copy this struct for each ici. Besides, it
1237  * would introduce the circular dependency problem, unless we port all client
1238  * drivers to release the clock, when not in use.
1239  */
1240 static const struct v4l2_clk_ops soc_camera_clk_ops = {
1241         .owner = THIS_MODULE,
1242         .enable = soc_camera_clk_enable,
1243         .disable = soc_camera_clk_disable,
1244 };
1245 
1246 static int soc_camera_dyn_pdev(struct soc_camera_desc *sdesc,
1247                                struct soc_camera_async_client *sasc)
1248 {
1249         struct platform_device *pdev;
1250         int ret, i;
1251 
1252         mutex_lock(&list_lock);
1253         i = find_first_zero_bit(device_map, MAP_MAX_NUM);
1254         if (i < MAP_MAX_NUM)
1255                 set_bit(i, device_map);
1256         mutex_unlock(&list_lock);
1257         if (i >= MAP_MAX_NUM)
1258                 return -ENOMEM;
1259 
1260         pdev = platform_device_alloc("soc-camera-pdrv", i);
1261         if (!pdev)
1262                 return -ENOMEM;
1263 
1264         ret = platform_device_add_data(pdev, sdesc, sizeof(*sdesc));
1265         if (ret < 0) {
1266                 platform_device_put(pdev);
1267                 return ret;
1268         }
1269 
1270         sasc->pdev = pdev;
1271 
1272         return 0;
1273 }
1274 
1275 static struct soc_camera_device *soc_camera_add_pdev(struct soc_camera_async_client *sasc)
1276 {
1277         struct platform_device *pdev = sasc->pdev;
1278         int ret;
1279 
1280         ret = platform_device_add(pdev);
1281         if (ret < 0 || !pdev->dev.driver)
1282                 return NULL;
1283 
1284         return platform_get_drvdata(pdev);
1285 }
1286 
1287 /* Locking: called with .host_lock held */
1288 static int soc_camera_probe_finish(struct soc_camera_device *icd)
1289 {
1290         struct v4l2_subdev *sd = soc_camera_to_subdev(icd);
1291         struct v4l2_mbus_framefmt mf;
1292         int ret;
1293 
1294         sd->grp_id = soc_camera_grp_id(icd);
1295         v4l2_set_subdev_hostdata(sd, icd);
1296 
1297         v4l2_subdev_call(sd, video, g_tvnorms, &icd->vdev->tvnorms);
1298 
1299         ret = v4l2_ctrl_add_handler(&icd->ctrl_handler, sd->ctrl_handler, NULL);
1300         if (ret < 0)
1301                 return ret;
1302 
1303         ret = soc_camera_add_device(icd);
1304         if (ret < 0) {
1305                 dev_err(icd->pdev, "Couldn't activate the camera: %d\n", ret);
1306                 return ret;
1307         }
1308 
1309         /* At this point client .probe() should have run already */
1310         ret = soc_camera_init_user_formats(icd);
1311         if (ret < 0)
1312                 goto eusrfmt;
1313 
1314         icd->field = V4L2_FIELD_ANY;
1315 
1316         ret = soc_camera_video_start(icd);
1317         if (ret < 0)
1318                 goto evidstart;
1319 
1320         /* Try to improve our guess of a reasonable window format */
1321         if (!v4l2_subdev_call(sd, video, g_mbus_fmt, &mf)) {
1322                 icd->user_width         = mf.width;
1323                 icd->user_height        = mf.height;
1324                 icd->colorspace         = mf.colorspace;
1325                 icd->field              = mf.field;
1326         }
1327         soc_camera_remove_device(icd);
1328 
1329         return 0;
1330 
1331 evidstart:
1332         soc_camera_free_user_formats(icd);
1333 eusrfmt:
1334         soc_camera_remove_device(icd);
1335 
1336         return ret;
1337 }
1338 
1339 #ifdef CONFIG_I2C_BOARDINFO
1340 static int soc_camera_i2c_init(struct soc_camera_device *icd,
1341                                struct soc_camera_desc *sdesc)
1342 {
1343         struct soc_camera_subdev_desc *ssdd;
1344         struct i2c_client *client;
1345         struct soc_camera_host *ici;
1346         struct soc_camera_host_desc *shd = &sdesc->host_desc;
1347         struct i2c_adapter *adap;
1348         struct v4l2_subdev *subdev;
1349         char clk_name[V4L2_SUBDEV_NAME_SIZE];
1350         int ret;
1351 
1352         /* First find out how we link the main client */
1353         if (icd->sasc) {
1354                 /* Async non-OF probing handled by the subdevice list */
1355                 return -EPROBE_DEFER;
1356         }
1357 
1358         ici = to_soc_camera_host(icd->parent);
1359         adap = i2c_get_adapter(shd->i2c_adapter_id);
1360         if (!adap) {
1361                 dev_err(icd->pdev, "Cannot get I2C adapter #%d. No driver?\n",
1362                         shd->i2c_adapter_id);
1363                 return -ENODEV;
1364         }
1365 
1366         ssdd = kmemdup(&sdesc->subdev_desc, sizeof(*ssdd), GFP_KERNEL);
1367         if (!ssdd) {
1368                 ret = -ENOMEM;
1369                 goto ealloc;
1370         }
1371         /*
1372          * In synchronous case we request regulators ourselves in
1373          * soc_camera_pdrv_probe(), make sure the subdevice driver doesn't try
1374          * to allocate them again.
1375          */
1376         ssdd->sd_pdata.num_regulators = 0;
1377         ssdd->sd_pdata.regulators = NULL;
1378         shd->board_info->platform_data = ssdd;
1379 
1380         snprintf(clk_name, sizeof(clk_name), "%d-%04x",
1381                  shd->i2c_adapter_id, shd->board_info->addr);
1382 
1383         icd->clk = v4l2_clk_register(&soc_camera_clk_ops, clk_name, "mclk", icd);
1384         if (IS_ERR(icd->clk)) {
1385                 ret = PTR_ERR(icd->clk);
1386                 goto eclkreg;
1387         }
1388 
1389         subdev = v4l2_i2c_new_subdev_board(&ici->v4l2_dev, adap,
1390                                 shd->board_info, NULL);
1391         if (!subdev) {
1392                 ret = -ENODEV;
1393                 goto ei2cnd;
1394         }
1395 
1396         client = v4l2_get_subdevdata(subdev);
1397 
1398         /* Use to_i2c_client(dev) to recover the i2c client */
1399         icd->control = &client->dev;
1400 
1401         return 0;
1402 ei2cnd:
1403         v4l2_clk_unregister(icd->clk);
1404         icd->clk = NULL;
1405 eclkreg:
1406         kfree(ssdd);
1407 ealloc:
1408         i2c_put_adapter(adap);
1409         return ret;
1410 }
1411 
1412 static void soc_camera_i2c_free(struct soc_camera_device *icd)
1413 {
1414         struct i2c_client *client =
1415                 to_i2c_client(to_soc_camera_control(icd));
1416         struct i2c_adapter *adap;
1417         struct soc_camera_subdev_desc *ssdd;
1418 
1419         icd->control = NULL;
1420         if (icd->sasc)
1421                 return;
1422 
1423         adap = client->adapter;
1424         ssdd = client->dev.platform_data;
1425         v4l2_device_unregister_subdev(i2c_get_clientdata(client));
1426         i2c_unregister_device(client);
1427         i2c_put_adapter(adap);
1428         kfree(ssdd);
1429         v4l2_clk_unregister(icd->clk);
1430         icd->clk = NULL;
1431 }
1432 
1433 /*
1434  * V4L2 asynchronous notifier callbacks. They are all called under a v4l2-async
1435  * internal global mutex, therefore cannot race against other asynchronous
1436  * events. Until notifier->complete() (soc_camera_async_complete()) is called,
1437  * the video device node is not registered and no V4L fops can occur. Unloading
1438  * of the host driver also calls a v4l2-async function, so also there we're
1439  * protected.
1440  */
1441 static int soc_camera_async_bound(struct v4l2_async_notifier *notifier,
1442                                   struct v4l2_subdev *sd,
1443                                   struct v4l2_async_subdev *asd)
1444 {
1445         struct soc_camera_async_client *sasc = container_of(notifier,
1446                                         struct soc_camera_async_client, notifier);
1447         struct soc_camera_device *icd = platform_get_drvdata(sasc->pdev);
1448 
1449         if (asd == sasc->sensor && !WARN_ON(icd->control)) {
1450                 struct i2c_client *client = v4l2_get_subdevdata(sd);
1451 
1452                 /*
1453                  * Only now we get subdevice-specific information like
1454                  * regulators, flags, callbacks, etc.
1455                  */
1456                 if (client) {
1457                         struct soc_camera_desc *sdesc = to_soc_camera_desc(icd);
1458                         struct soc_camera_subdev_desc *ssdd =
1459                                 soc_camera_i2c_to_desc(client);
1460                         if (ssdd) {
1461                                 memcpy(&sdesc->subdev_desc, ssdd,
1462                                        sizeof(sdesc->subdev_desc));
1463                                 if (ssdd->reset)
1464                                         ssdd->reset(icd->pdev);
1465                         }
1466 
1467                         icd->control = &client->dev;
1468                 }
1469         }
1470 
1471         return 0;
1472 }
1473 
1474 static void soc_camera_async_unbind(struct v4l2_async_notifier *notifier,
1475                                     struct v4l2_subdev *sd,
1476                                     struct v4l2_async_subdev *asd)
1477 {
1478         struct soc_camera_async_client *sasc = container_of(notifier,
1479                                         struct soc_camera_async_client, notifier);
1480         struct soc_camera_device *icd = platform_get_drvdata(sasc->pdev);
1481 
1482         if (icd->clk) {
1483                 v4l2_clk_unregister(icd->clk);
1484                 icd->clk = NULL;
1485         }
1486 }
1487 
1488 static int soc_camera_async_complete(struct v4l2_async_notifier *notifier)
1489 {
1490         struct soc_camera_async_client *sasc = container_of(notifier,
1491                                         struct soc_camera_async_client, notifier);
1492         struct soc_camera_device *icd = platform_get_drvdata(sasc->pdev);
1493 
1494         if (to_soc_camera_control(icd)) {
1495                 struct soc_camera_host *ici = to_soc_camera_host(icd->parent);
1496                 int ret;
1497 
1498                 mutex_lock(&list_lock);
1499                 ret = soc_camera_probe(ici, icd);
1500                 mutex_unlock(&list_lock);
1501                 if (ret < 0)
1502                         return ret;
1503         }
1504 
1505         return 0;
1506 }
1507 
1508 static int scan_async_group(struct soc_camera_host *ici,
1509                             struct v4l2_async_subdev **asd, unsigned int size)
1510 {
1511         struct soc_camera_async_subdev *sasd;
1512         struct soc_camera_async_client *sasc;
1513         struct soc_camera_device *icd;
1514         struct soc_camera_desc sdesc = {.host_desc.bus_id = ici->nr,};
1515         char clk_name[V4L2_SUBDEV_NAME_SIZE];
1516         unsigned int i;
1517         int ret;
1518 
1519         /* First look for a sensor */
1520         for (i = 0; i < size; i++) {
1521                 sasd = container_of(asd[i], struct soc_camera_async_subdev, asd);
1522                 if (sasd->role == SOCAM_SUBDEV_DATA_SOURCE)
1523                         break;
1524         }
1525 
1526         if (i >= size || asd[i]->match_type != V4L2_ASYNC_MATCH_I2C) {
1527                 /* All useless */
1528                 dev_err(ici->v4l2_dev.dev, "No I2C data source found!\n");
1529                 return -ENODEV;
1530         }
1531 
1532         /* Or shall this be managed by the soc-camera device? */
1533         sasc = devm_kzalloc(ici->v4l2_dev.dev, sizeof(*sasc), GFP_KERNEL);
1534         if (!sasc)
1535                 return -ENOMEM;
1536 
1537         /* HACK: just need a != NULL */
1538         sdesc.host_desc.board_info = ERR_PTR(-ENODATA);
1539 
1540         ret = soc_camera_dyn_pdev(&sdesc, sasc);
1541         if (ret < 0)
1542                 goto eallocpdev;
1543 
1544         sasc->sensor = &sasd->asd;
1545 
1546         icd = soc_camera_add_pdev(sasc);
1547         if (!icd) {
1548                 ret = -ENOMEM;
1549                 goto eaddpdev;
1550         }
1551 
1552         sasc->notifier.subdevs = asd;
1553         sasc->notifier.num_subdevs = size;
1554         sasc->notifier.bound = soc_camera_async_bound;
1555         sasc->notifier.unbind = soc_camera_async_unbind;
1556         sasc->notifier.complete = soc_camera_async_complete;
1557 
1558         icd->sasc = sasc;
1559         icd->parent = ici->v4l2_dev.dev;
1560 
1561         snprintf(clk_name, sizeof(clk_name), "%d-%04x",
1562                  sasd->asd.match.i2c.adapter_id, sasd->asd.match.i2c.address);
1563 
1564         icd->clk = v4l2_clk_register(&soc_camera_clk_ops, clk_name, "mclk", icd);
1565         if (IS_ERR(icd->clk)) {
1566                 ret = PTR_ERR(icd->clk);
1567                 goto eclkreg;
1568         }
1569 
1570         ret = v4l2_async_notifier_register(&ici->v4l2_dev, &sasc->notifier);
1571         if (!ret)
1572                 return 0;
1573 
1574         v4l2_clk_unregister(icd->clk);
1575 eclkreg:
1576         icd->clk = NULL;
1577         platform_device_del(sasc->pdev);
1578 eaddpdev:
1579         platform_device_put(sasc->pdev);
1580 eallocpdev:
1581         devm_kfree(ici->v4l2_dev.dev, sasc);
1582         dev_err(ici->v4l2_dev.dev, "group probe failed: %d\n", ret);
1583 
1584         return ret;
1585 }
1586 
1587 static void scan_async_host(struct soc_camera_host *ici)
1588 {
1589         struct v4l2_async_subdev **asd;
1590         int j;
1591 
1592         for (j = 0, asd = ici->asd; ici->asd_sizes[j]; j++) {
1593                 scan_async_group(ici, asd, ici->asd_sizes[j]);
1594                 asd += ici->asd_sizes[j];
1595         }
1596 }
1597 #else
1598 #define soc_camera_i2c_init(icd, sdesc) (-ENODEV)
1599 #define soc_camera_i2c_free(icd)        do {} while (0)
1600 #define scan_async_host(ici)            do {} while (0)
1601 #endif
1602 
1603 #ifdef CONFIG_OF
1604 
1605 struct soc_of_info {
1606         struct soc_camera_async_subdev  sasd;
1607         struct soc_camera_async_client  sasc;
1608         struct v4l2_async_subdev        *subdev;
1609 };
1610 
1611 static int soc_of_bind(struct soc_camera_host *ici,
1612                        struct device_node *ep,
1613                        struct device_node *remote)
1614 {
1615         struct soc_camera_device *icd;
1616         struct soc_camera_desc sdesc = {.host_desc.bus_id = ici->nr,};
1617         struct soc_camera_async_client *sasc;
1618         struct soc_of_info *info;
1619         struct i2c_client *client;
1620         char clk_name[V4L2_SUBDEV_NAME_SIZE];
1621         int ret;
1622 
1623         /* allocate a new subdev and add match info to it */
1624         info = devm_kzalloc(ici->v4l2_dev.dev, sizeof(struct soc_of_info),
1625                             GFP_KERNEL);
1626         if (!info)
1627                 return -ENOMEM;
1628 
1629         info->sasd.asd.match.of.node = remote;
1630         info->sasd.asd.match_type = V4L2_ASYNC_MATCH_OF;
1631         info->subdev = &info->sasd.asd;
1632 
1633         /* Or shall this be managed by the soc-camera device? */
1634         sasc = &info->sasc;
1635 
1636         /* HACK: just need a != NULL */
1637         sdesc.host_desc.board_info = ERR_PTR(-ENODATA);
1638 
1639         ret = soc_camera_dyn_pdev(&sdesc, sasc);
1640         if (ret < 0)
1641                 goto eallocpdev;
1642 
1643         sasc->sensor = &info->sasd.asd;
1644 
1645         icd = soc_camera_add_pdev(sasc);
1646         if (!icd) {
1647                 ret = -ENOMEM;
1648                 goto eaddpdev;
1649         }
1650 
1651         sasc->notifier.subdevs = &info->subdev;
1652         sasc->notifier.num_subdevs = 1;
1653         sasc->notifier.bound = soc_camera_async_bound;
1654         sasc->notifier.unbind = soc_camera_async_unbind;
1655         sasc->notifier.complete = soc_camera_async_complete;
1656 
1657         icd->sasc = sasc;
1658         icd->parent = ici->v4l2_dev.dev;
1659 
1660         client = of_find_i2c_device_by_node(remote);
1661 
1662         if (client)
1663                 snprintf(clk_name, sizeof(clk_name), "%d-%04x",
1664                          client->adapter->nr, client->addr);
1665         else
1666                 snprintf(clk_name, sizeof(clk_name), "of-%s",
1667                          of_node_full_name(remote));
1668 
1669         icd->clk = v4l2_clk_register(&soc_camera_clk_ops, clk_name, "mclk", icd);
1670         if (IS_ERR(icd->clk)) {
1671                 ret = PTR_ERR(icd->clk);
1672                 goto eclkreg;
1673         }
1674 
1675         ret = v4l2_async_notifier_register(&ici->v4l2_dev, &sasc->notifier);
1676         if (!ret)
1677                 return 0;
1678 eclkreg:
1679         icd->clk = NULL;
1680         platform_device_del(sasc->pdev);
1681 eaddpdev:
1682         platform_device_put(sasc->pdev);
1683 eallocpdev:
1684         devm_kfree(ici->v4l2_dev.dev, sasc);
1685         dev_err(ici->v4l2_dev.dev, "group probe failed: %d\n", ret);
1686 
1687         return ret;
1688 }
1689 
1690 static void scan_of_host(struct soc_camera_host *ici)
1691 {
1692         struct device *dev = ici->v4l2_dev.dev;
1693         struct device_node *np = dev->of_node;
1694         struct device_node *epn = NULL, *ren;
1695         unsigned int i;
1696 
1697         for (i = 0; ; i++) {
1698                 epn = of_graph_get_next_endpoint(np, epn);
1699                 if (!epn)
1700                         break;
1701 
1702                 ren = of_graph_get_remote_port(epn);
1703                 if (!ren) {
1704                         dev_notice(dev, "no remote for %s\n",
1705                                    of_node_full_name(epn));
1706                         continue;
1707                 }
1708 
1709                 /* so we now have a remote node to connect */
1710                 if (!i)
1711                         soc_of_bind(ici, epn, ren->parent);
1712 
1713                 of_node_put(epn);
1714                 of_node_put(ren);
1715 
1716                 if (i) {
1717                         dev_err(dev, "multiple subdevices aren't supported yet!\n");
1718                         break;
1719                 }
1720         }
1721 }
1722 
1723 #else
1724 static inline void scan_of_host(struct soc_camera_host *ici) { }
1725 #endif
1726 
1727 /* Called during host-driver probe */
1728 static int soc_camera_probe(struct soc_camera_host *ici,
1729                             struct soc_camera_device *icd)
1730 {
1731         struct soc_camera_desc *sdesc = to_soc_camera_desc(icd);
1732         struct soc_camera_host_desc *shd = &sdesc->host_desc;
1733         struct device *control = NULL;
1734         int ret;
1735 
1736         dev_info(icd->pdev, "Probing %s\n", dev_name(icd->pdev));
1737 
1738         /*
1739          * Currently the subdev with the largest number of controls (13) is
1740          * ov6550. So let's pick 16 as a hint for the control handler. Note
1741          * that this is a hint only: too large and you waste some memory, too
1742          * small and there is a (very) small performance hit when looking up
1743          * controls in the internal hash.
1744          */
1745         ret = v4l2_ctrl_handler_init(&icd->ctrl_handler, 16);
1746         if (ret < 0)
1747                 return ret;
1748 
1749         /* Must have icd->vdev before registering the device */
1750         ret = video_dev_create(icd);
1751         if (ret < 0)
1752                 goto evdc;
1753 
1754         /*
1755          * ..._video_start() will create a device node, video_register_device()
1756          * itself is protected against concurrent open() calls, but we also have
1757          * to protect our data also during client probing.
1758          */
1759 
1760         /* Non-i2c cameras, e.g., soc_camera_platform, have no board_info */
1761         if (shd->board_info) {
1762                 ret = soc_camera_i2c_init(icd, sdesc);
1763                 if (ret < 0 && ret != -EPROBE_DEFER)
1764                         goto eadd;
1765         } else if (!shd->add_device || !shd->del_device) {
1766                 ret = -EINVAL;
1767                 goto eadd;
1768         } else {
1769                 mutex_lock(&ici->clk_lock);
1770                 ret = ici->ops->clock_start(ici);
1771                 mutex_unlock(&ici->clk_lock);
1772                 if (ret < 0)
1773                         goto eadd;
1774 
1775                 if (shd->module_name)
1776                         ret = request_module(shd->module_name);
1777 
1778                 ret = shd->add_device(icd);
1779                 if (ret < 0)
1780                         goto eadddev;
1781 
1782                 /*
1783                  * FIXME: this is racy, have to use driver-binding notification,
1784                  * when it is available
1785                  */
1786                 control = to_soc_camera_control(icd);
1787                 if (!control || !control->driver || !dev_get_drvdata(control) ||
1788                     !try_module_get(control->driver->owner)) {
1789                         shd->del_device(icd);
1790                         ret = -ENODEV;
1791                         goto enodrv;
1792                 }
1793         }
1794 
1795         mutex_lock(&ici->host_lock);
1796         ret = soc_camera_probe_finish(icd);
1797         mutex_unlock(&ici->host_lock);
1798         if (ret < 0)
1799                 goto efinish;
1800 
1801         return 0;
1802 
1803 efinish:
1804         if (shd->board_info) {
1805                 soc_camera_i2c_free(icd);
1806         } else {
1807                 shd->del_device(icd);
1808                 module_put(control->driver->owner);
1809 enodrv:
1810 eadddev:
1811                 mutex_lock(&ici->clk_lock);
1812                 ici->ops->clock_stop(ici);
1813                 mutex_unlock(&ici->clk_lock);
1814         }
1815 eadd:
1816         video_device_release(icd->vdev);
1817         icd->vdev = NULL;
1818         if (icd->vdev) {
1819                 video_device_release(icd->vdev);
1820                 icd->vdev = NULL;
1821         }
1822 evdc:
1823         v4l2_ctrl_handler_free(&icd->ctrl_handler);
1824         return ret;
1825 }
1826 
1827 /*
1828  * This is called on device_unregister, which only means we have to disconnect
1829  * from the host, but not remove ourselves from the device list. With
1830  * asynchronous client probing this can also be called without
1831  * soc_camera_probe_finish() having run. Careful with clean up.
1832  */
1833 static int soc_camera_remove(struct soc_camera_device *icd)
1834 {
1835         struct soc_camera_desc *sdesc = to_soc_camera_desc(icd);
1836         struct video_device *vdev = icd->vdev;
1837 
1838         v4l2_ctrl_handler_free(&icd->ctrl_handler);
1839         if (vdev) {
1840                 video_unregister_device(vdev);
1841                 icd->vdev = NULL;
1842         }
1843 
1844         if (sdesc->host_desc.board_info) {
1845                 soc_camera_i2c_free(icd);
1846         } else {
1847                 struct device *dev = to_soc_camera_control(icd);
1848                 struct device_driver *drv = dev ? dev->driver : NULL;
1849                 if (drv) {
1850                         sdesc->host_desc.del_device(icd);
1851                         module_put(drv->owner);
1852                 }
1853         }
1854 
1855         if (icd->num_user_formats)
1856                 soc_camera_free_user_formats(icd);
1857 
1858         if (icd->clk) {
1859                 /* For the synchronous case */
1860                 v4l2_clk_unregister(icd->clk);
1861                 icd->clk = NULL;
1862         }
1863 
1864         if (icd->sasc)
1865                 platform_device_unregister(icd->sasc->pdev);
1866 
1867         return 0;
1868 }
1869 
1870 static int default_cropcap(struct soc_camera_device *icd,
1871                            struct v4l2_cropcap *a)
1872 {
1873         struct v4l2_subdev *sd = soc_camera_to_subdev(icd);
1874         return v4l2_subdev_call(sd, video, cropcap, a);
1875 }
1876 
1877 static int default_g_crop(struct soc_camera_device *icd, struct v4l2_crop *a)
1878 {
1879         struct v4l2_subdev *sd = soc_camera_to_subdev(icd);
1880         return v4l2_subdev_call(sd, video, g_crop, a);
1881 }
1882 
1883 static int default_s_crop(struct soc_camera_device *icd, const struct v4l2_crop *a)
1884 {
1885         struct v4l2_subdev *sd = soc_camera_to_subdev(icd);
1886         return v4l2_subdev_call(sd, video, s_crop, a);
1887 }
1888 
1889 static int default_g_parm(struct soc_camera_device *icd,
1890                           struct v4l2_streamparm *parm)
1891 {
1892         struct v4l2_subdev *sd = soc_camera_to_subdev(icd);
1893         return v4l2_subdev_call(sd, video, g_parm, parm);
1894 }
1895 
1896 static int default_s_parm(struct soc_camera_device *icd,
1897                           struct v4l2_streamparm *parm)
1898 {
1899         struct v4l2_subdev *sd = soc_camera_to_subdev(icd);
1900         return v4l2_subdev_call(sd, video, s_parm, parm);
1901 }
1902 
1903 static int default_enum_framesizes(struct soc_camera_device *icd,
1904                                    struct v4l2_frmsizeenum *fsize)
1905 {
1906         int ret;
1907         struct v4l2_subdev *sd = soc_camera_to_subdev(icd);
1908         const struct soc_camera_format_xlate *xlate;
1909         __u32 pixfmt = fsize->pixel_format;
1910         struct v4l2_frmsizeenum fsize_mbus = *fsize;
1911 
1912         xlate = soc_camera_xlate_by_fourcc(icd, pixfmt);
1913         if (!xlate)
1914                 return -EINVAL;
1915         /* map xlate-code to pixel_format, sensor only handle xlate-code*/
1916         fsize_mbus.pixel_format = xlate->code;
1917 
1918         ret = v4l2_subdev_call(sd, video, enum_framesizes, &fsize_mbus);
1919         if (ret < 0)
1920                 return ret;
1921 
1922         *fsize = fsize_mbus;
1923         fsize->pixel_format = pixfmt;
1924 
1925         return 0;
1926 }
1927 
1928 int soc_camera_host_register(struct soc_camera_host *ici)
1929 {
1930         struct soc_camera_host *ix;
1931         int ret;
1932 
1933         if (!ici || !ici->ops ||
1934             !ici->ops->try_fmt ||
1935             !ici->ops->set_fmt ||
1936             !ici->ops->set_bus_param ||
1937             !ici->ops->querycap ||
1938             ((!ici->ops->init_videobuf ||
1939               !ici->ops->reqbufs) &&
1940              !ici->ops->init_videobuf2) ||
1941             !ici->ops->clock_start ||
1942             !ici->ops->clock_stop ||
1943             !ici->ops->poll ||
1944             !ici->v4l2_dev.dev)
1945                 return -EINVAL;
1946 
1947         if (!ici->ops->set_crop)
1948                 ici->ops->set_crop = default_s_crop;
1949         if (!ici->ops->get_crop)
1950                 ici->ops->get_crop = default_g_crop;
1951         if (!ici->ops->cropcap)
1952                 ici->ops->cropcap = default_cropcap;
1953         if (!ici->ops->set_parm)
1954                 ici->ops->set_parm = default_s_parm;
1955         if (!ici->ops->get_parm)
1956                 ici->ops->get_parm = default_g_parm;
1957         if (!ici->ops->enum_framesizes)
1958                 ici->ops->enum_framesizes = default_enum_framesizes;
1959 
1960         mutex_lock(&list_lock);
1961         list_for_each_entry(ix, &hosts, list) {
1962                 if (ix->nr == ici->nr) {
1963                         ret = -EBUSY;
1964                         goto edevreg;
1965                 }
1966         }
1967 
1968         ret = v4l2_device_register(ici->v4l2_dev.dev, &ici->v4l2_dev);
1969         if (ret < 0)
1970                 goto edevreg;
1971 
1972         list_add_tail(&ici->list, &hosts);
1973         mutex_unlock(&list_lock);
1974 
1975         mutex_init(&ici->host_lock);
1976         mutex_init(&ici->clk_lock);
1977 
1978         if (ici->v4l2_dev.dev->of_node)
1979                 scan_of_host(ici);
1980         else if (ici->asd_sizes)
1981                 /*
1982                  * No OF, host with a list of subdevices. Don't try to mix
1983                  * modes by initialising some groups statically and some
1984                  * dynamically!
1985                  */
1986                 scan_async_host(ici);
1987         else
1988                 /* Legacy: static platform devices from board data */
1989                 scan_add_host(ici);
1990 
1991         return 0;
1992 
1993 edevreg:
1994         mutex_unlock(&list_lock);
1995         return ret;
1996 }
1997 EXPORT_SYMBOL(soc_camera_host_register);
1998 
1999 /* Unregister all clients! */
2000 void soc_camera_host_unregister(struct soc_camera_host *ici)
2001 {
2002         struct soc_camera_device *icd, *tmp;
2003         struct soc_camera_async_client *sasc;
2004         LIST_HEAD(notifiers);
2005 
2006         mutex_lock(&list_lock);
2007         list_del(&ici->list);
2008         list_for_each_entry(icd, &devices, list)
2009                 if (icd->iface == ici->nr && icd->sasc) {
2010                         /* as long as we hold the device, sasc won't be freed */
2011                         get_device(icd->pdev);
2012                         list_add(&icd->sasc->list, &notifiers);
2013                 }
2014         mutex_unlock(&list_lock);
2015 
2016         list_for_each_entry(sasc, &notifiers, list) {
2017                 /* Must call unlocked to avoid AB-BA dead-lock */
2018                 v4l2_async_notifier_unregister(&sasc->notifier);
2019                 put_device(&sasc->pdev->dev);
2020         }
2021 
2022         mutex_lock(&list_lock);
2023 
2024         list_for_each_entry_safe(icd, tmp, &devices, list)
2025                 if (icd->iface == ici->nr)
2026                         soc_camera_remove(icd);
2027 
2028         mutex_unlock(&list_lock);
2029 
2030         v4l2_device_unregister(&ici->v4l2_dev);
2031 }
2032 EXPORT_SYMBOL(soc_camera_host_unregister);
2033 
2034 /* Image capture device */
2035 static int soc_camera_device_register(struct soc_camera_device *icd)
2036 {
2037         struct soc_camera_device *ix;
2038         int num = -1, i;
2039 
2040         mutex_lock(&list_lock);
2041         for (i = 0; i < 256 && num < 0; i++) {
2042                 num = i;
2043                 /* Check if this index is available on this interface */
2044                 list_for_each_entry(ix, &devices, list) {
2045                         if (ix->iface == icd->iface && ix->devnum == i) {
2046                                 num = -1;
2047                                 break;
2048                         }
2049                 }
2050         }
2051 
2052         if (num < 0) {
2053                 /*
2054                  * ok, we have 256 cameras on this host...
2055                  * man, stay reasonable...
2056                  */
2057                 mutex_unlock(&list_lock);
2058                 return -ENOMEM;
2059         }
2060 
2061         icd->devnum             = num;
2062         icd->use_count          = 0;
2063         icd->host_priv          = NULL;
2064 
2065         /*
2066          * Dynamically allocated devices set the bit earlier, but it doesn't hurt setting
2067          * it again
2068          */
2069         i = to_platform_device(icd->pdev)->id;
2070         if (i < 0)
2071                 /* One static (legacy) soc-camera platform device */
2072                 i = 0;
2073         if (i >= MAP_MAX_NUM) {
2074                 mutex_unlock(&list_lock);
2075                 return -EBUSY;
2076         }
2077         set_bit(i, device_map);
2078         list_add_tail(&icd->list, &devices);
2079         mutex_unlock(&list_lock);
2080 
2081         return 0;
2082 }
2083 
2084 static const struct v4l2_ioctl_ops soc_camera_ioctl_ops = {
2085         .vidioc_querycap         = soc_camera_querycap,
2086         .vidioc_try_fmt_vid_cap  = soc_camera_try_fmt_vid_cap,
2087         .vidioc_g_fmt_vid_cap    = soc_camera_g_fmt_vid_cap,
2088         .vidioc_s_fmt_vid_cap    = soc_camera_s_fmt_vid_cap,
2089         .vidioc_enum_fmt_vid_cap = soc_camera_enum_fmt_vid_cap,
2090         .vidioc_enum_input       = soc_camera_enum_input,
2091         .vidioc_g_input          = soc_camera_g_input,
2092         .vidioc_s_input          = soc_camera_s_input,
2093         .vidioc_s_std            = soc_camera_s_std,
2094         .vidioc_g_std            = soc_camera_g_std,
2095         .vidioc_enum_framesizes  = soc_camera_enum_framesizes,
2096         .vidioc_reqbufs          = soc_camera_reqbufs,
2097         .vidioc_querybuf         = soc_camera_querybuf,
2098         .vidioc_qbuf             = soc_camera_qbuf,
2099         .vidioc_dqbuf            = soc_camera_dqbuf,
2100         .vidioc_create_bufs      = soc_camera_create_bufs,
2101         .vidioc_prepare_buf      = soc_camera_prepare_buf,
2102         .vidioc_expbuf           = soc_camera_expbuf,
2103         .vidioc_streamon         = soc_camera_streamon,
2104         .vidioc_streamoff        = soc_camera_streamoff,
2105         .vidioc_cropcap          = soc_camera_cropcap,
2106         .vidioc_g_crop           = soc_camera_g_crop,
2107         .vidioc_s_crop           = soc_camera_s_crop,
2108         .vidioc_g_selection      = soc_camera_g_selection,
2109         .vidioc_s_selection      = soc_camera_s_selection,
2110         .vidioc_g_parm           = soc_camera_g_parm,
2111         .vidioc_s_parm           = soc_camera_s_parm,
2112 };
2113 
2114 static int video_dev_create(struct soc_camera_device *icd)
2115 {
2116         struct soc_camera_host *ici = to_soc_camera_host(icd->parent);
2117         struct video_device *vdev = video_device_alloc();
2118 
2119         if (!vdev)
2120                 return -ENOMEM;
2121 
2122         strlcpy(vdev->name, ici->drv_name, sizeof(vdev->name));
2123 
2124         vdev->v4l2_dev          = &ici->v4l2_dev;
2125         vdev->fops              = &soc_camera_fops;
2126         vdev->ioctl_ops         = &soc_camera_ioctl_ops;
2127         vdev->release           = video_device_release;
2128         vdev->ctrl_handler      = &icd->ctrl_handler;
2129         vdev->lock              = &ici->host_lock;
2130 
2131         icd->vdev = vdev;
2132 
2133         return 0;
2134 }
2135 
2136 /*
2137  * Called from soc_camera_probe() above with .host_lock held
2138  */
2139 static int soc_camera_video_start(struct soc_camera_device *icd)
2140 {
2141         const struct device_type *type = icd->vdev->dev.type;
2142         int ret;
2143 
2144         if (!icd->parent)
2145                 return -ENODEV;
2146 
2147         video_set_drvdata(icd->vdev, icd);
2148         if (icd->vdev->tvnorms == 0) {
2149                 /* disable the STD API if there are no tvnorms defined */
2150                 v4l2_disable_ioctl(icd->vdev, VIDIOC_G_STD);
2151                 v4l2_disable_ioctl(icd->vdev, VIDIOC_S_STD);
2152                 v4l2_disable_ioctl(icd->vdev, VIDIOC_ENUMSTD);
2153         }
2154         ret = video_register_device(icd->vdev, VFL_TYPE_GRABBER, -1);
2155         if (ret < 0) {
2156                 dev_err(icd->pdev, "video_register_device failed: %d\n", ret);
2157                 return ret;
2158         }
2159 
2160         /* Restore device type, possibly set by the subdevice driver */
2161         icd->vdev->dev.type = type;
2162 
2163         return 0;
2164 }
2165 
2166 static int soc_camera_pdrv_probe(struct platform_device *pdev)
2167 {
2168         struct soc_camera_desc *sdesc = pdev->dev.platform_data;
2169         struct soc_camera_subdev_desc *ssdd = &sdesc->subdev_desc;
2170         struct soc_camera_device *icd;
2171         int ret;
2172 
2173         if (!sdesc)
2174                 return -EINVAL;
2175 
2176         icd = devm_kzalloc(&pdev->dev, sizeof(*icd), GFP_KERNEL);
2177         if (!icd)
2178                 return -ENOMEM;
2179 
2180         /*
2181          * In the asynchronous case ssdd->num_regulators == 0 yet, so, the below
2182          * regulator allocation is a dummy. They are actually requested by the
2183          * subdevice driver, using soc_camera_power_init(). Also note, that in
2184          * that case regulators are attached to the I2C device and not to the
2185          * camera platform device.
2186          */
2187         ret = devm_regulator_bulk_get(&pdev->dev, ssdd->sd_pdata.num_regulators,
2188                                       ssdd->sd_pdata.regulators);
2189         if (ret < 0)
2190                 return ret;
2191 
2192         icd->iface = sdesc->host_desc.bus_id;
2193         icd->sdesc = sdesc;
2194         icd->pdev = &pdev->dev;
2195         platform_set_drvdata(pdev, icd);
2196 
2197         icd->user_width         = DEFAULT_WIDTH;
2198         icd->user_height        = DEFAULT_HEIGHT;
2199 
2200         return soc_camera_device_register(icd);
2201 }
2202 
2203 /*
2204  * Only called on rmmod for each platform device, since they are not
2205  * hot-pluggable. Now we know, that all our users - hosts and devices have
2206  * been unloaded already
2207  */
2208 static int soc_camera_pdrv_remove(struct platform_device *pdev)
2209 {
2210         struct soc_camera_device *icd = platform_get_drvdata(pdev);
2211         int i;
2212 
2213         if (!icd)
2214                 return -EINVAL;
2215 
2216         i = pdev->id;
2217         if (i < 0)
2218                 i = 0;
2219 
2220         /*
2221          * In synchronous mode with static platform devices this is called in a
2222          * loop from drivers/base/dd.c::driver_detach(), no parallel execution,
2223          * no need to lock. In asynchronous case the caller -
2224          * soc_camera_host_unregister() - already holds the lock
2225          */
2226         if (test_bit(i, device_map)) {
2227                 clear_bit(i, device_map);
2228                 list_del(&icd->list);
2229         }
2230 
2231         return 0;
2232 }
2233 
2234 static struct platform_driver __refdata soc_camera_pdrv = {
2235         .probe = soc_camera_pdrv_probe,
2236         .remove  = soc_camera_pdrv_remove,
2237         .driver  = {
2238                 .name   = "soc-camera-pdrv",
2239                 .owner  = THIS_MODULE,
2240         },
2241 };
2242 
2243 module_platform_driver(soc_camera_pdrv);
2244 
2245 MODULE_DESCRIPTION("Image capture bus driver");
2246 MODULE_AUTHOR("Guennadi Liakhovetski <kernel@pengutronix.de>");
2247 MODULE_LICENSE("GPL");
2248 MODULE_ALIAS("platform:soc-camera-pdrv");
2249 

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