Version:  2.0.40 2.2.26 2.4.37 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 3.19 4.0 4.1

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 static int soc_camera_clock_start(struct soc_camera_host *ici)
181 {
182         int ret;
183 
184         if (!ici->ops->clock_start)
185                 return 0;
186 
187         mutex_lock(&ici->clk_lock);
188         ret = ici->ops->clock_start(ici);
189         mutex_unlock(&ici->clk_lock);
190 
191         return ret;
192 }
193 
194 static void soc_camera_clock_stop(struct soc_camera_host *ici)
195 {
196         if (!ici->ops->clock_stop)
197                 return;
198 
199         mutex_lock(&ici->clk_lock);
200         ici->ops->clock_stop(ici);
201         mutex_unlock(&ici->clk_lock);
202 }
203 
204 const struct soc_camera_format_xlate *soc_camera_xlate_by_fourcc(
205         struct soc_camera_device *icd, unsigned int fourcc)
206 {
207         unsigned int i;
208 
209         for (i = 0; i < icd->num_user_formats; i++)
210                 if (icd->user_formats[i].host_fmt->fourcc == fourcc)
211                         return icd->user_formats + i;
212         return NULL;
213 }
214 EXPORT_SYMBOL(soc_camera_xlate_by_fourcc);
215 
216 /**
217  * soc_camera_apply_board_flags() - apply platform SOCAM_SENSOR_INVERT_* flags
218  * @ssdd:       camera platform parameters
219  * @cfg:        media bus configuration
220  * @return:     resulting flags
221  */
222 unsigned long soc_camera_apply_board_flags(struct soc_camera_subdev_desc *ssdd,
223                                            const struct v4l2_mbus_config *cfg)
224 {
225         unsigned long f, flags = cfg->flags;
226 
227         /* If only one of the two polarities is supported, switch to the opposite */
228         if (ssdd->flags & SOCAM_SENSOR_INVERT_HSYNC) {
229                 f = flags & (V4L2_MBUS_HSYNC_ACTIVE_HIGH | V4L2_MBUS_HSYNC_ACTIVE_LOW);
230                 if (f == V4L2_MBUS_HSYNC_ACTIVE_HIGH || f == V4L2_MBUS_HSYNC_ACTIVE_LOW)
231                         flags ^= V4L2_MBUS_HSYNC_ACTIVE_HIGH | V4L2_MBUS_HSYNC_ACTIVE_LOW;
232         }
233 
234         if (ssdd->flags & SOCAM_SENSOR_INVERT_VSYNC) {
235                 f = flags & (V4L2_MBUS_VSYNC_ACTIVE_HIGH | V4L2_MBUS_VSYNC_ACTIVE_LOW);
236                 if (f == V4L2_MBUS_VSYNC_ACTIVE_HIGH || f == V4L2_MBUS_VSYNC_ACTIVE_LOW)
237                         flags ^= V4L2_MBUS_VSYNC_ACTIVE_HIGH | V4L2_MBUS_VSYNC_ACTIVE_LOW;
238         }
239 
240         if (ssdd->flags & SOCAM_SENSOR_INVERT_PCLK) {
241                 f = flags & (V4L2_MBUS_PCLK_SAMPLE_RISING | V4L2_MBUS_PCLK_SAMPLE_FALLING);
242                 if (f == V4L2_MBUS_PCLK_SAMPLE_RISING || f == V4L2_MBUS_PCLK_SAMPLE_FALLING)
243                         flags ^= V4L2_MBUS_PCLK_SAMPLE_RISING | V4L2_MBUS_PCLK_SAMPLE_FALLING;
244         }
245 
246         return flags;
247 }
248 EXPORT_SYMBOL(soc_camera_apply_board_flags);
249 
250 #define pixfmtstr(x) (x) & 0xff, ((x) >> 8) & 0xff, ((x) >> 16) & 0xff, \
251         ((x) >> 24) & 0xff
252 
253 static int soc_camera_try_fmt(struct soc_camera_device *icd,
254                               struct v4l2_format *f)
255 {
256         struct soc_camera_host *ici = to_soc_camera_host(icd->parent);
257         const struct soc_camera_format_xlate *xlate;
258         struct v4l2_pix_format *pix = &f->fmt.pix;
259         int ret;
260 
261         dev_dbg(icd->pdev, "TRY_FMT(%c%c%c%c, %ux%u)\n",
262                 pixfmtstr(pix->pixelformat), pix->width, pix->height);
263 
264         if (pix->pixelformat != V4L2_PIX_FMT_JPEG &&
265             !(ici->capabilities & SOCAM_HOST_CAP_STRIDE)) {
266                 pix->bytesperline = 0;
267                 pix->sizeimage = 0;
268         }
269 
270         ret = ici->ops->try_fmt(icd, f);
271         if (ret < 0)
272                 return ret;
273 
274         xlate = soc_camera_xlate_by_fourcc(icd, pix->pixelformat);
275         if (!xlate)
276                 return -EINVAL;
277 
278         ret = soc_mbus_bytes_per_line(pix->width, xlate->host_fmt);
279         if (ret < 0)
280                 return ret;
281 
282         pix->bytesperline = max_t(u32, pix->bytesperline, ret);
283 
284         ret = soc_mbus_image_size(xlate->host_fmt, pix->bytesperline,
285                                   pix->height);
286         if (ret < 0)
287                 return ret;
288 
289         pix->sizeimage = max_t(u32, pix->sizeimage, ret);
290 
291         return 0;
292 }
293 
294 static int soc_camera_try_fmt_vid_cap(struct file *file, void *priv,
295                                       struct v4l2_format *f)
296 {
297         struct soc_camera_device *icd = file->private_data;
298 
299         WARN_ON(priv != file->private_data);
300 
301         /* Only single-plane capture is supported so far */
302         if (f->type != V4L2_BUF_TYPE_VIDEO_CAPTURE)
303                 return -EINVAL;
304 
305         /* limit format to hardware capabilities */
306         return soc_camera_try_fmt(icd, f);
307 }
308 
309 static int soc_camera_enum_input(struct file *file, void *priv,
310                                  struct v4l2_input *inp)
311 {
312         if (inp->index != 0)
313                 return -EINVAL;
314 
315         /* default is camera */
316         inp->type = V4L2_INPUT_TYPE_CAMERA;
317         strcpy(inp->name, "Camera");
318 
319         return 0;
320 }
321 
322 static int soc_camera_g_input(struct file *file, void *priv, unsigned int *i)
323 {
324         *i = 0;
325 
326         return 0;
327 }
328 
329 static int soc_camera_s_input(struct file *file, void *priv, unsigned int i)
330 {
331         if (i > 0)
332                 return -EINVAL;
333 
334         return 0;
335 }
336 
337 static int soc_camera_s_std(struct file *file, void *priv, v4l2_std_id a)
338 {
339         struct soc_camera_device *icd = file->private_data;
340         struct v4l2_subdev *sd = soc_camera_to_subdev(icd);
341 
342         return v4l2_subdev_call(sd, video, s_std, a);
343 }
344 
345 static int soc_camera_g_std(struct file *file, void *priv, v4l2_std_id *a)
346 {
347         struct soc_camera_device *icd = file->private_data;
348         struct v4l2_subdev *sd = soc_camera_to_subdev(icd);
349 
350         return v4l2_subdev_call(sd, video, g_std, a);
351 }
352 
353 static int soc_camera_enum_framesizes(struct file *file, void *fh,
354                                          struct v4l2_frmsizeenum *fsize)
355 {
356         struct soc_camera_device *icd = file->private_data;
357         struct soc_camera_host *ici = to_soc_camera_host(icd->parent);
358 
359         return ici->ops->enum_framesizes(icd, fsize);
360 }
361 
362 static int soc_camera_reqbufs(struct file *file, void *priv,
363                               struct v4l2_requestbuffers *p)
364 {
365         int ret;
366         struct soc_camera_device *icd = file->private_data;
367         struct soc_camera_host *ici = to_soc_camera_host(icd->parent);
368 
369         WARN_ON(priv != file->private_data);
370 
371         if (icd->streamer && icd->streamer != file)
372                 return -EBUSY;
373 
374         if (ici->ops->init_videobuf) {
375                 ret = videobuf_reqbufs(&icd->vb_vidq, p);
376                 if (ret < 0)
377                         return ret;
378 
379                 ret = ici->ops->reqbufs(icd, p);
380         } else {
381                 ret = vb2_reqbufs(&icd->vb2_vidq, p);
382         }
383 
384         if (!ret && !icd->streamer)
385                 icd->streamer = file;
386 
387         return ret;
388 }
389 
390 static int soc_camera_querybuf(struct file *file, void *priv,
391                                struct v4l2_buffer *p)
392 {
393         struct soc_camera_device *icd = file->private_data;
394         struct soc_camera_host *ici = to_soc_camera_host(icd->parent);
395 
396         WARN_ON(priv != file->private_data);
397 
398         if (ici->ops->init_videobuf)
399                 return videobuf_querybuf(&icd->vb_vidq, p);
400         else
401                 return vb2_querybuf(&icd->vb2_vidq, p);
402 }
403 
404 static int soc_camera_qbuf(struct file *file, void *priv,
405                            struct v4l2_buffer *p)
406 {
407         struct soc_camera_device *icd = file->private_data;
408         struct soc_camera_host *ici = to_soc_camera_host(icd->parent);
409 
410         WARN_ON(priv != file->private_data);
411 
412         if (icd->streamer != file)
413                 return -EBUSY;
414 
415         if (ici->ops->init_videobuf)
416                 return videobuf_qbuf(&icd->vb_vidq, p);
417         else
418                 return vb2_qbuf(&icd->vb2_vidq, p);
419 }
420 
421 static int soc_camera_dqbuf(struct file *file, void *priv,
422                             struct v4l2_buffer *p)
423 {
424         struct soc_camera_device *icd = file->private_data;
425         struct soc_camera_host *ici = to_soc_camera_host(icd->parent);
426 
427         WARN_ON(priv != file->private_data);
428 
429         if (icd->streamer != file)
430                 return -EBUSY;
431 
432         if (ici->ops->init_videobuf)
433                 return videobuf_dqbuf(&icd->vb_vidq, p, file->f_flags & O_NONBLOCK);
434         else
435                 return vb2_dqbuf(&icd->vb2_vidq, p, file->f_flags & O_NONBLOCK);
436 }
437 
438 static int soc_camera_create_bufs(struct file *file, void *priv,
439                             struct v4l2_create_buffers *create)
440 {
441         struct soc_camera_device *icd = file->private_data;
442         struct soc_camera_host *ici = to_soc_camera_host(icd->parent);
443 
444         /* videobuf2 only */
445         if (ici->ops->init_videobuf)
446                 return -EINVAL;
447         else
448                 return vb2_create_bufs(&icd->vb2_vidq, create);
449 }
450 
451 static int soc_camera_prepare_buf(struct file *file, void *priv,
452                                   struct v4l2_buffer *b)
453 {
454         struct soc_camera_device *icd = file->private_data;
455         struct soc_camera_host *ici = to_soc_camera_host(icd->parent);
456 
457         /* videobuf2 only */
458         if (ici->ops->init_videobuf)
459                 return -EINVAL;
460         else
461                 return vb2_prepare_buf(&icd->vb2_vidq, b);
462 }
463 
464 static int soc_camera_expbuf(struct file *file, void *priv,
465                              struct v4l2_exportbuffer *p)
466 {
467         struct soc_camera_device *icd = file->private_data;
468         struct soc_camera_host *ici = to_soc_camera_host(icd->parent);
469 
470         if (icd->streamer != file)
471                 return -EBUSY;
472 
473         /* videobuf2 only */
474         if (ici->ops->init_videobuf)
475                 return -EINVAL;
476         else
477                 return vb2_expbuf(&icd->vb2_vidq, p);
478 }
479 
480 /* Always entered with .host_lock held */
481 static int soc_camera_init_user_formats(struct soc_camera_device *icd)
482 {
483         struct v4l2_subdev *sd = soc_camera_to_subdev(icd);
484         struct soc_camera_host *ici = to_soc_camera_host(icd->parent);
485         unsigned int i, fmts = 0, raw_fmts = 0;
486         int ret;
487         u32 code;
488 
489         while (!v4l2_subdev_call(sd, video, enum_mbus_fmt, raw_fmts, &code))
490                 raw_fmts++;
491 
492         if (!ici->ops->get_formats)
493                 /*
494                  * Fallback mode - the host will have to serve all
495                  * sensor-provided formats one-to-one to the user
496                  */
497                 fmts = raw_fmts;
498         else
499                 /*
500                  * First pass - only count formats this host-sensor
501                  * configuration can provide
502                  */
503                 for (i = 0; i < raw_fmts; i++) {
504                         ret = ici->ops->get_formats(icd, i, NULL);
505                         if (ret < 0)
506                                 return ret;
507                         fmts += ret;
508                 }
509 
510         if (!fmts)
511                 return -ENXIO;
512 
513         icd->user_formats =
514                 vmalloc(fmts * sizeof(struct soc_camera_format_xlate));
515         if (!icd->user_formats)
516                 return -ENOMEM;
517 
518         dev_dbg(icd->pdev, "Found %d supported formats.\n", fmts);
519 
520         /* Second pass - actually fill data formats */
521         fmts = 0;
522         for (i = 0; i < raw_fmts; i++)
523                 if (!ici->ops->get_formats) {
524                         v4l2_subdev_call(sd, video, enum_mbus_fmt, i, &code);
525                         icd->user_formats[fmts].host_fmt =
526                                 soc_mbus_get_fmtdesc(code);
527                         if (icd->user_formats[fmts].host_fmt)
528                                 icd->user_formats[fmts++].code = code;
529                 } else {
530                         ret = ici->ops->get_formats(icd, i,
531                                                     &icd->user_formats[fmts]);
532                         if (ret < 0)
533                                 goto egfmt;
534                         fmts += ret;
535                 }
536 
537         icd->num_user_formats = fmts;
538         icd->current_fmt = &icd->user_formats[0];
539 
540         return 0;
541 
542 egfmt:
543         vfree(icd->user_formats);
544         return ret;
545 }
546 
547 /* Always entered with .host_lock held */
548 static void soc_camera_free_user_formats(struct soc_camera_device *icd)
549 {
550         struct soc_camera_host *ici = to_soc_camera_host(icd->parent);
551 
552         if (ici->ops->put_formats)
553                 ici->ops->put_formats(icd);
554         icd->current_fmt = NULL;
555         icd->num_user_formats = 0;
556         vfree(icd->user_formats);
557         icd->user_formats = NULL;
558 }
559 
560 /* Called with .vb_lock held, or from the first open(2), see comment there */
561 static int soc_camera_set_fmt(struct soc_camera_device *icd,
562                               struct v4l2_format *f)
563 {
564         struct soc_camera_host *ici = to_soc_camera_host(icd->parent);
565         struct v4l2_pix_format *pix = &f->fmt.pix;
566         int ret;
567 
568         dev_dbg(icd->pdev, "S_FMT(%c%c%c%c, %ux%u)\n",
569                 pixfmtstr(pix->pixelformat), pix->width, pix->height);
570 
571         /* We always call try_fmt() before set_fmt() or set_crop() */
572         ret = soc_camera_try_fmt(icd, f);
573         if (ret < 0)
574                 return ret;
575 
576         ret = ici->ops->set_fmt(icd, f);
577         if (ret < 0) {
578                 return ret;
579         } else if (!icd->current_fmt ||
580                    icd->current_fmt->host_fmt->fourcc != pix->pixelformat) {
581                 dev_err(icd->pdev,
582                         "Host driver hasn't set up current format correctly!\n");
583                 return -EINVAL;
584         }
585 
586         icd->user_width         = pix->width;
587         icd->user_height        = pix->height;
588         icd->bytesperline       = pix->bytesperline;
589         icd->sizeimage          = pix->sizeimage;
590         icd->colorspace         = pix->colorspace;
591         icd->field              = pix->field;
592         if (ici->ops->init_videobuf)
593                 icd->vb_vidq.field = pix->field;
594 
595         dev_dbg(icd->pdev, "set width: %d height: %d\n",
596                 icd->user_width, icd->user_height);
597 
598         /* set physical bus parameters */
599         return ici->ops->set_bus_param(icd);
600 }
601 
602 static int soc_camera_add_device(struct soc_camera_device *icd)
603 {
604         struct soc_camera_host *ici = to_soc_camera_host(icd->parent);
605         int ret;
606 
607         if (ici->icd)
608                 return -EBUSY;
609 
610         if (!icd->clk) {
611                 ret = soc_camera_clock_start(ici);
612                 if (ret < 0)
613                         return ret;
614         }
615 
616         if (ici->ops->add) {
617                 ret = ici->ops->add(icd);
618                 if (ret < 0)
619                         goto eadd;
620         }
621 
622         ici->icd = icd;
623 
624         return 0;
625 
626 eadd:
627         if (!icd->clk)
628                 soc_camera_clock_stop(ici);
629         return ret;
630 }
631 
632 static void soc_camera_remove_device(struct soc_camera_device *icd)
633 {
634         struct soc_camera_host *ici = to_soc_camera_host(icd->parent);
635 
636         if (WARN_ON(icd != ici->icd))
637                 return;
638 
639         if (ici->ops->remove)
640                 ici->ops->remove(icd);
641         if (!icd->clk)
642                 soc_camera_clock_stop(ici);
643         ici->icd = NULL;
644 }
645 
646 static int soc_camera_open(struct file *file)
647 {
648         struct video_device *vdev = video_devdata(file);
649         struct soc_camera_device *icd;
650         struct soc_camera_host *ici;
651         int ret;
652 
653         /*
654          * Don't mess with the host during probe: wait until the loop in
655          * scan_add_host() completes. Also protect against a race with
656          * soc_camera_host_unregister().
657          */
658         if (mutex_lock_interruptible(&list_lock))
659                 return -ERESTARTSYS;
660 
661         if (!vdev || !video_is_registered(vdev)) {
662                 mutex_unlock(&list_lock);
663                 return -ENODEV;
664         }
665 
666         icd = video_get_drvdata(vdev);
667         ici = to_soc_camera_host(icd->parent);
668 
669         ret = try_module_get(ici->ops->owner) ? 0 : -ENODEV;
670         mutex_unlock(&list_lock);
671 
672         if (ret < 0) {
673                 dev_err(icd->pdev, "Couldn't lock capture bus driver.\n");
674                 return ret;
675         }
676 
677         if (!to_soc_camera_control(icd)) {
678                 /* No device driver attached */
679                 ret = -ENODEV;
680                 goto econtrol;
681         }
682 
683         if (mutex_lock_interruptible(&ici->host_lock)) {
684                 ret = -ERESTARTSYS;
685                 goto elockhost;
686         }
687         icd->use_count++;
688 
689         /* Now we really have to activate the camera */
690         if (icd->use_count == 1) {
691                 struct soc_camera_desc *sdesc = to_soc_camera_desc(icd);
692                 /* Restore parameters before the last close() per V4L2 API */
693                 struct v4l2_format f = {
694                         .type = V4L2_BUF_TYPE_VIDEO_CAPTURE,
695                         .fmt.pix = {
696                                 .width          = icd->user_width,
697                                 .height         = icd->user_height,
698                                 .field          = icd->field,
699                                 .colorspace     = icd->colorspace,
700                                 .pixelformat    =
701                                         icd->current_fmt->host_fmt->fourcc,
702                         },
703                 };
704 
705                 /* The camera could have been already on, try to reset */
706                 if (sdesc->subdev_desc.reset)
707                         if (icd->control)
708                                 sdesc->subdev_desc.reset(icd->control);
709 
710                 ret = soc_camera_add_device(icd);
711                 if (ret < 0) {
712                         dev_err(icd->pdev, "Couldn't activate the camera: %d\n", ret);
713                         goto eiciadd;
714                 }
715 
716                 ret = __soc_camera_power_on(icd);
717                 if (ret < 0)
718                         goto epower;
719 
720                 pm_runtime_enable(&icd->vdev->dev);
721                 ret = pm_runtime_resume(&icd->vdev->dev);
722                 if (ret < 0 && ret != -ENOSYS)
723                         goto eresume;
724 
725                 /*
726                  * Try to configure with default parameters. Notice: this is the
727                  * very first open, so, we cannot race against other calls,
728                  * apart from someone else calling open() simultaneously, but
729                  * .host_lock is protecting us against it.
730                  */
731                 ret = soc_camera_set_fmt(icd, &f);
732                 if (ret < 0)
733                         goto esfmt;
734 
735                 if (ici->ops->init_videobuf) {
736                         ici->ops->init_videobuf(&icd->vb_vidq, icd);
737                 } else {
738                         ret = ici->ops->init_videobuf2(&icd->vb2_vidq, icd);
739                         if (ret < 0)
740                                 goto einitvb;
741                 }
742                 v4l2_ctrl_handler_setup(&icd->ctrl_handler);
743         }
744         mutex_unlock(&ici->host_lock);
745 
746         file->private_data = icd;
747         dev_dbg(icd->pdev, "camera device open\n");
748 
749         return 0;
750 
751         /*
752          * All errors are entered with the .host_lock held, first four also
753          * with use_count == 1
754          */
755 einitvb:
756 esfmt:
757         pm_runtime_disable(&icd->vdev->dev);
758 eresume:
759         __soc_camera_power_off(icd);
760 epower:
761         soc_camera_remove_device(icd);
762 eiciadd:
763         icd->use_count--;
764         mutex_unlock(&ici->host_lock);
765 elockhost:
766 econtrol:
767         module_put(ici->ops->owner);
768 
769         return ret;
770 }
771 
772 static int soc_camera_close(struct file *file)
773 {
774         struct soc_camera_device *icd = file->private_data;
775         struct soc_camera_host *ici = to_soc_camera_host(icd->parent);
776 
777         mutex_lock(&ici->host_lock);
778         icd->use_count--;
779         if (!icd->use_count) {
780                 pm_runtime_suspend(&icd->vdev->dev);
781                 pm_runtime_disable(&icd->vdev->dev);
782 
783                 if (ici->ops->init_videobuf2)
784                         vb2_queue_release(&icd->vb2_vidq);
785                 __soc_camera_power_off(icd);
786 
787                 soc_camera_remove_device(icd);
788         }
789 
790         if (icd->streamer == file)
791                 icd->streamer = NULL;
792         mutex_unlock(&ici->host_lock);
793 
794         module_put(ici->ops->owner);
795 
796         dev_dbg(icd->pdev, "camera device close\n");
797 
798         return 0;
799 }
800 
801 static ssize_t soc_camera_read(struct file *file, char __user *buf,
802                                size_t count, loff_t *ppos)
803 {
804         struct soc_camera_device *icd = file->private_data;
805         struct soc_camera_host *ici = to_soc_camera_host(icd->parent);
806 
807         dev_dbg(icd->pdev, "read called, buf %p\n", buf);
808 
809         if (ici->ops->init_videobuf2 && icd->vb2_vidq.io_modes & VB2_READ)
810                 return vb2_read(&icd->vb2_vidq, buf, count, ppos,
811                                 file->f_flags & O_NONBLOCK);
812 
813         dev_err(icd->pdev, "camera device read not implemented\n");
814 
815         return -EINVAL;
816 }
817 
818 static int soc_camera_mmap(struct file *file, struct vm_area_struct *vma)
819 {
820         struct soc_camera_device *icd = file->private_data;
821         struct soc_camera_host *ici = to_soc_camera_host(icd->parent);
822         int err;
823 
824         dev_dbg(icd->pdev, "mmap called, vma=0x%08lx\n", (unsigned long)vma);
825 
826         if (icd->streamer != file)
827                 return -EBUSY;
828 
829         if (mutex_lock_interruptible(&ici->host_lock))
830                 return -ERESTARTSYS;
831         if (ici->ops->init_videobuf)
832                 err = videobuf_mmap_mapper(&icd->vb_vidq, vma);
833         else
834                 err = vb2_mmap(&icd->vb2_vidq, vma);
835         mutex_unlock(&ici->host_lock);
836 
837         dev_dbg(icd->pdev, "vma start=0x%08lx, size=%ld, ret=%d\n",
838                 (unsigned long)vma->vm_start,
839                 (unsigned long)vma->vm_end - (unsigned long)vma->vm_start,
840                 err);
841 
842         return err;
843 }
844 
845 static unsigned int soc_camera_poll(struct file *file, poll_table *pt)
846 {
847         struct soc_camera_device *icd = file->private_data;
848         struct soc_camera_host *ici = to_soc_camera_host(icd->parent);
849         unsigned res = POLLERR;
850 
851         if (icd->streamer != file)
852                 return POLLERR;
853 
854         mutex_lock(&ici->host_lock);
855         if (ici->ops->init_videobuf && list_empty(&icd->vb_vidq.stream))
856                 dev_err(icd->pdev, "Trying to poll with no queued buffers!\n");
857         else
858                 res = ici->ops->poll(file, pt);
859         mutex_unlock(&ici->host_lock);
860         return res;
861 }
862 
863 static struct v4l2_file_operations soc_camera_fops = {
864         .owner          = THIS_MODULE,
865         .open           = soc_camera_open,
866         .release        = soc_camera_close,
867         .unlocked_ioctl = video_ioctl2,
868         .read           = soc_camera_read,
869         .mmap           = soc_camera_mmap,
870         .poll           = soc_camera_poll,
871 };
872 
873 static int soc_camera_s_fmt_vid_cap(struct file *file, void *priv,
874                                     struct v4l2_format *f)
875 {
876         struct soc_camera_device *icd = file->private_data;
877         int ret;
878 
879         WARN_ON(priv != file->private_data);
880 
881         if (f->type != V4L2_BUF_TYPE_VIDEO_CAPTURE) {
882                 dev_warn(icd->pdev, "Wrong buf-type %d\n", f->type);
883                 return -EINVAL;
884         }
885 
886         if (icd->streamer && icd->streamer != file)
887                 return -EBUSY;
888 
889         if (is_streaming(to_soc_camera_host(icd->parent), icd)) {
890                 dev_err(icd->pdev, "S_FMT denied: queue initialised\n");
891                 return -EBUSY;
892         }
893 
894         ret = soc_camera_set_fmt(icd, f);
895 
896         if (!ret && !icd->streamer)
897                 icd->streamer = file;
898 
899         return ret;
900 }
901 
902 static int soc_camera_enum_fmt_vid_cap(struct file *file, void  *priv,
903                                        struct v4l2_fmtdesc *f)
904 {
905         struct soc_camera_device *icd = file->private_data;
906         const struct soc_mbus_pixelfmt *format;
907 
908         WARN_ON(priv != file->private_data);
909 
910         if (f->index >= icd->num_user_formats)
911                 return -EINVAL;
912 
913         format = icd->user_formats[f->index].host_fmt;
914 
915         if (format->name)
916                 strlcpy(f->description, format->name, sizeof(f->description));
917         f->pixelformat = format->fourcc;
918         return 0;
919 }
920 
921 static int soc_camera_g_fmt_vid_cap(struct file *file, void *priv,
922                                     struct v4l2_format *f)
923 {
924         struct soc_camera_device *icd = file->private_data;
925         struct v4l2_pix_format *pix = &f->fmt.pix;
926 
927         WARN_ON(priv != file->private_data);
928 
929         if (f->type != V4L2_BUF_TYPE_VIDEO_CAPTURE)
930                 return -EINVAL;
931 
932         pix->width              = icd->user_width;
933         pix->height             = icd->user_height;
934         pix->bytesperline       = icd->bytesperline;
935         pix->sizeimage          = icd->sizeimage;
936         pix->field              = icd->field;
937         pix->pixelformat        = icd->current_fmt->host_fmt->fourcc;
938         pix->colorspace         = icd->colorspace;
939         dev_dbg(icd->pdev, "current_fmt->fourcc: 0x%08x\n",
940                 icd->current_fmt->host_fmt->fourcc);
941         return 0;
942 }
943 
944 static int soc_camera_querycap(struct file *file, void  *priv,
945                                struct v4l2_capability *cap)
946 {
947         struct soc_camera_device *icd = file->private_data;
948         struct soc_camera_host *ici = to_soc_camera_host(icd->parent);
949 
950         WARN_ON(priv != file->private_data);
951 
952         strlcpy(cap->driver, ici->drv_name, sizeof(cap->driver));
953         return ici->ops->querycap(ici, cap);
954 }
955 
956 static int soc_camera_streamon(struct file *file, void *priv,
957                                enum v4l2_buf_type i)
958 {
959         struct soc_camera_device *icd = file->private_data;
960         struct soc_camera_host *ici = to_soc_camera_host(icd->parent);
961         struct v4l2_subdev *sd = soc_camera_to_subdev(icd);
962         int ret;
963 
964         WARN_ON(priv != file->private_data);
965 
966         if (i != V4L2_BUF_TYPE_VIDEO_CAPTURE)
967                 return -EINVAL;
968 
969         if (icd->streamer != file)
970                 return -EBUSY;
971 
972         /* This calls buf_queue from host driver's videobuf_queue_ops */
973         if (ici->ops->init_videobuf)
974                 ret = videobuf_streamon(&icd->vb_vidq);
975         else
976                 ret = vb2_streamon(&icd->vb2_vidq, i);
977 
978         if (!ret)
979                 v4l2_subdev_call(sd, video, s_stream, 1);
980 
981         return ret;
982 }
983 
984 static int soc_camera_streamoff(struct file *file, void *priv,
985                                 enum v4l2_buf_type i)
986 {
987         struct soc_camera_device *icd = file->private_data;
988         struct v4l2_subdev *sd = soc_camera_to_subdev(icd);
989         struct soc_camera_host *ici = to_soc_camera_host(icd->parent);
990 
991         WARN_ON(priv != file->private_data);
992 
993         if (i != V4L2_BUF_TYPE_VIDEO_CAPTURE)
994                 return -EINVAL;
995 
996         if (icd->streamer != file)
997                 return -EBUSY;
998 
999         /*
1000          * This calls buf_release from host driver's videobuf_queue_ops for all
1001          * remaining buffers. When the last buffer is freed, stop capture
1002          */
1003         if (ici->ops->init_videobuf)
1004                 videobuf_streamoff(&icd->vb_vidq);
1005         else
1006                 vb2_streamoff(&icd->vb2_vidq, i);
1007 
1008         v4l2_subdev_call(sd, video, s_stream, 0);
1009 
1010         return 0;
1011 }
1012 
1013 static int soc_camera_cropcap(struct file *file, void *fh,
1014                               struct v4l2_cropcap *a)
1015 {
1016         struct soc_camera_device *icd = file->private_data;
1017         struct soc_camera_host *ici = to_soc_camera_host(icd->parent);
1018 
1019         return ici->ops->cropcap(icd, a);
1020 }
1021 
1022 static int soc_camera_g_crop(struct file *file, void *fh,
1023                              struct v4l2_crop *a)
1024 {
1025         struct soc_camera_device *icd = file->private_data;
1026         struct soc_camera_host *ici = to_soc_camera_host(icd->parent);
1027         int ret;
1028 
1029         ret = ici->ops->get_crop(icd, a);
1030 
1031         return ret;
1032 }
1033 
1034 /*
1035  * According to the V4L2 API, drivers shall not update the struct v4l2_crop
1036  * argument with the actual geometry, instead, the user shall use G_CROP to
1037  * retrieve it.
1038  */
1039 static int soc_camera_s_crop(struct file *file, void *fh,
1040                              const struct v4l2_crop *a)
1041 {
1042         struct soc_camera_device *icd = file->private_data;
1043         struct soc_camera_host *ici = to_soc_camera_host(icd->parent);
1044         const struct v4l2_rect *rect = &a->c;
1045         struct v4l2_crop current_crop;
1046         int ret;
1047 
1048         if (a->type != V4L2_BUF_TYPE_VIDEO_CAPTURE)
1049                 return -EINVAL;
1050 
1051         dev_dbg(icd->pdev, "S_CROP(%ux%u@%u:%u)\n",
1052                 rect->width, rect->height, rect->left, rect->top);
1053 
1054         current_crop.type = a->type;
1055 
1056         /* If get_crop fails, we'll let host and / or client drivers decide */
1057         ret = ici->ops->get_crop(icd, &current_crop);
1058 
1059         /* Prohibit window size change with initialised buffers */
1060         if (ret < 0) {
1061                 dev_err(icd->pdev,
1062                         "S_CROP denied: getting current crop failed\n");
1063         } else if ((a->c.width == current_crop.c.width &&
1064                     a->c.height == current_crop.c.height) ||
1065                    !is_streaming(ici, icd)) {
1066                 /* same size or not streaming - use .set_crop() */
1067                 ret = ici->ops->set_crop(icd, a);
1068         } else if (ici->ops->set_livecrop) {
1069                 ret = ici->ops->set_livecrop(icd, a);
1070         } else {
1071                 dev_err(icd->pdev,
1072                         "S_CROP denied: queue initialised and sizes differ\n");
1073                 ret = -EBUSY;
1074         }
1075 
1076         return ret;
1077 }
1078 
1079 static int soc_camera_g_selection(struct file *file, void *fh,
1080                                   struct v4l2_selection *s)
1081 {
1082         struct soc_camera_device *icd = file->private_data;
1083         struct soc_camera_host *ici = to_soc_camera_host(icd->parent);
1084 
1085         /* With a wrong type no need to try to fall back to cropping */
1086         if (s->type != V4L2_BUF_TYPE_VIDEO_CAPTURE)
1087                 return -EINVAL;
1088 
1089         if (!ici->ops->get_selection)
1090                 return -ENOTTY;
1091 
1092         return ici->ops->get_selection(icd, s);
1093 }
1094 
1095 static int soc_camera_s_selection(struct file *file, void *fh,
1096                                   struct v4l2_selection *s)
1097 {
1098         struct soc_camera_device *icd = file->private_data;
1099         struct soc_camera_host *ici = to_soc_camera_host(icd->parent);
1100         int ret;
1101 
1102         /* In all these cases cropping emulation will not help */
1103         if (s->type != V4L2_BUF_TYPE_VIDEO_CAPTURE ||
1104             (s->target != V4L2_SEL_TGT_COMPOSE &&
1105              s->target != V4L2_SEL_TGT_CROP))
1106                 return -EINVAL;
1107 
1108         if (s->target == V4L2_SEL_TGT_COMPOSE) {
1109                 /* No output size change during a running capture! */
1110                 if (is_streaming(ici, icd) &&
1111                     (icd->user_width != s->r.width ||
1112                      icd->user_height != s->r.height))
1113                         return -EBUSY;
1114 
1115                 /*
1116                  * Only one user is allowed to change the output format, touch
1117                  * buffers, start / stop streaming, poll for data
1118                  */
1119                 if (icd->streamer && icd->streamer != file)
1120                         return -EBUSY;
1121         }
1122 
1123         if (!ici->ops->set_selection)
1124                 return -ENOTTY;
1125 
1126         ret = ici->ops->set_selection(icd, s);
1127         if (!ret &&
1128             s->target == V4L2_SEL_TGT_COMPOSE) {
1129                 icd->user_width = s->r.width;
1130                 icd->user_height = s->r.height;
1131                 if (!icd->streamer)
1132                         icd->streamer = file;
1133         }
1134 
1135         return ret;
1136 }
1137 
1138 static int soc_camera_g_parm(struct file *file, void *fh,
1139                              struct v4l2_streamparm *a)
1140 {
1141         struct soc_camera_device *icd = file->private_data;
1142         struct soc_camera_host *ici = to_soc_camera_host(icd->parent);
1143 
1144         if (ici->ops->get_parm)
1145                 return ici->ops->get_parm(icd, a);
1146 
1147         return -ENOIOCTLCMD;
1148 }
1149 
1150 static int soc_camera_s_parm(struct file *file, void *fh,
1151                              struct v4l2_streamparm *a)
1152 {
1153         struct soc_camera_device *icd = file->private_data;
1154         struct soc_camera_host *ici = to_soc_camera_host(icd->parent);
1155 
1156         if (ici->ops->set_parm)
1157                 return ici->ops->set_parm(icd, a);
1158 
1159         return -ENOIOCTLCMD;
1160 }
1161 
1162 static int soc_camera_probe(struct soc_camera_host *ici,
1163                             struct soc_camera_device *icd);
1164 
1165 /* So far this function cannot fail */
1166 static void scan_add_host(struct soc_camera_host *ici)
1167 {
1168         struct soc_camera_device *icd;
1169 
1170         mutex_lock(&list_lock);
1171 
1172         list_for_each_entry(icd, &devices, list)
1173                 if (icd->iface == ici->nr) {
1174                         struct soc_camera_desc *sdesc = to_soc_camera_desc(icd);
1175                         struct soc_camera_subdev_desc *ssdd = &sdesc->subdev_desc;
1176 
1177                         /* The camera could have been already on, try to reset */
1178                         if (ssdd->reset)
1179                                 if (icd->control)
1180                                         ssdd->reset(icd->control);
1181 
1182                         icd->parent = ici->v4l2_dev.dev;
1183 
1184                         /* Ignore errors */
1185                         soc_camera_probe(ici, icd);
1186                 }
1187 
1188         mutex_unlock(&list_lock);
1189 }
1190 
1191 /*
1192  * It is invalid to call v4l2_clk_enable() after a successful probing
1193  * asynchronously outside of V4L2 operations, i.e. with .host_lock not held.
1194  */
1195 static int soc_camera_clk_enable(struct v4l2_clk *clk)
1196 {
1197         struct soc_camera_device *icd = clk->priv;
1198         struct soc_camera_host *ici;
1199 
1200         if (!icd || !icd->parent)
1201                 return -ENODEV;
1202 
1203         ici = to_soc_camera_host(icd->parent);
1204 
1205         if (!try_module_get(ici->ops->owner))
1206                 return -ENODEV;
1207 
1208         /*
1209          * If a different client is currently being probed, the host will tell
1210          * you to go
1211          */
1212         return soc_camera_clock_start(ici);
1213 }
1214 
1215 static void soc_camera_clk_disable(struct v4l2_clk *clk)
1216 {
1217         struct soc_camera_device *icd = clk->priv;
1218         struct soc_camera_host *ici;
1219 
1220         if (!icd || !icd->parent)
1221                 return;
1222 
1223         ici = to_soc_camera_host(icd->parent);
1224 
1225         soc_camera_clock_stop(ici);
1226 
1227         module_put(ici->ops->owner);
1228 }
1229 
1230 /*
1231  * Eventually, it would be more logical to make the respective host the clock
1232  * owner, but then we would have to copy this struct for each ici. Besides, it
1233  * would introduce the circular dependency problem, unless we port all client
1234  * drivers to release the clock, when not in use.
1235  */
1236 static const struct v4l2_clk_ops soc_camera_clk_ops = {
1237         .owner = THIS_MODULE,
1238         .enable = soc_camera_clk_enable,
1239         .disable = soc_camera_clk_disable,
1240 };
1241 
1242 static int soc_camera_dyn_pdev(struct soc_camera_desc *sdesc,
1243                                struct soc_camera_async_client *sasc)
1244 {
1245         struct platform_device *pdev;
1246         int ret, i;
1247 
1248         mutex_lock(&list_lock);
1249         i = find_first_zero_bit(device_map, MAP_MAX_NUM);
1250         if (i < MAP_MAX_NUM)
1251                 set_bit(i, device_map);
1252         mutex_unlock(&list_lock);
1253         if (i >= MAP_MAX_NUM)
1254                 return -ENOMEM;
1255 
1256         pdev = platform_device_alloc("soc-camera-pdrv", i);
1257         if (!pdev)
1258                 return -ENOMEM;
1259 
1260         ret = platform_device_add_data(pdev, sdesc, sizeof(*sdesc));
1261         if (ret < 0) {
1262                 platform_device_put(pdev);
1263                 return ret;
1264         }
1265 
1266         sasc->pdev = pdev;
1267 
1268         return 0;
1269 }
1270 
1271 static struct soc_camera_device *soc_camera_add_pdev(struct soc_camera_async_client *sasc)
1272 {
1273         struct platform_device *pdev = sasc->pdev;
1274         int ret;
1275 
1276         ret = platform_device_add(pdev);
1277         if (ret < 0 || !pdev->dev.driver)
1278                 return NULL;
1279 
1280         return platform_get_drvdata(pdev);
1281 }
1282 
1283 /* Locking: called with .host_lock held */
1284 static int soc_camera_probe_finish(struct soc_camera_device *icd)
1285 {
1286         struct v4l2_subdev *sd = soc_camera_to_subdev(icd);
1287         struct v4l2_mbus_framefmt mf;
1288         int ret;
1289 
1290         sd->grp_id = soc_camera_grp_id(icd);
1291         v4l2_set_subdev_hostdata(sd, icd);
1292 
1293         v4l2_subdev_call(sd, video, g_tvnorms, &icd->vdev->tvnorms);
1294 
1295         ret = v4l2_ctrl_add_handler(&icd->ctrl_handler, sd->ctrl_handler, NULL);
1296         if (ret < 0)
1297                 return ret;
1298 
1299         ret = soc_camera_add_device(icd);
1300         if (ret < 0) {
1301                 dev_err(icd->pdev, "Couldn't activate the camera: %d\n", ret);
1302                 return ret;
1303         }
1304 
1305         /* At this point client .probe() should have run already */
1306         ret = soc_camera_init_user_formats(icd);
1307         if (ret < 0)
1308                 goto eusrfmt;
1309 
1310         icd->field = V4L2_FIELD_ANY;
1311 
1312         ret = soc_camera_video_start(icd);
1313         if (ret < 0)
1314                 goto evidstart;
1315 
1316         /* Try to improve our guess of a reasonable window format */
1317         if (!v4l2_subdev_call(sd, video, g_mbus_fmt, &mf)) {
1318                 icd->user_width         = mf.width;
1319                 icd->user_height        = mf.height;
1320                 icd->colorspace         = mf.colorspace;
1321                 icd->field              = mf.field;
1322         }
1323         soc_camera_remove_device(icd);
1324 
1325         return 0;
1326 
1327 evidstart:
1328         soc_camera_free_user_formats(icd);
1329 eusrfmt:
1330         soc_camera_remove_device(icd);
1331 
1332         return ret;
1333 }
1334 
1335 #ifdef CONFIG_I2C_BOARDINFO
1336 static int soc_camera_i2c_init(struct soc_camera_device *icd,
1337                                struct soc_camera_desc *sdesc)
1338 {
1339         struct soc_camera_subdev_desc *ssdd;
1340         struct i2c_client *client;
1341         struct soc_camera_host *ici;
1342         struct soc_camera_host_desc *shd = &sdesc->host_desc;
1343         struct i2c_adapter *adap;
1344         struct v4l2_subdev *subdev;
1345         char clk_name[V4L2_SUBDEV_NAME_SIZE];
1346         int ret;
1347 
1348         /* First find out how we link the main client */
1349         if (icd->sasc) {
1350                 /* Async non-OF probing handled by the subdevice list */
1351                 return -EPROBE_DEFER;
1352         }
1353 
1354         ici = to_soc_camera_host(icd->parent);
1355         adap = i2c_get_adapter(shd->i2c_adapter_id);
1356         if (!adap) {
1357                 dev_err(icd->pdev, "Cannot get I2C adapter #%d. No driver?\n",
1358                         shd->i2c_adapter_id);
1359                 return -ENODEV;
1360         }
1361 
1362         ssdd = kmemdup(&sdesc->subdev_desc, sizeof(*ssdd), GFP_KERNEL);
1363         if (!ssdd) {
1364                 ret = -ENOMEM;
1365                 goto ealloc;
1366         }
1367         /*
1368          * In synchronous case we request regulators ourselves in
1369          * soc_camera_pdrv_probe(), make sure the subdevice driver doesn't try
1370          * to allocate them again.
1371          */
1372         ssdd->sd_pdata.num_regulators = 0;
1373         ssdd->sd_pdata.regulators = NULL;
1374         shd->board_info->platform_data = ssdd;
1375 
1376         snprintf(clk_name, sizeof(clk_name), "%d-%04x",
1377                  shd->i2c_adapter_id, shd->board_info->addr);
1378 
1379         icd->clk = v4l2_clk_register(&soc_camera_clk_ops, clk_name, icd);
1380         if (IS_ERR(icd->clk)) {
1381                 ret = PTR_ERR(icd->clk);
1382                 goto eclkreg;
1383         }
1384 
1385         subdev = v4l2_i2c_new_subdev_board(&ici->v4l2_dev, adap,
1386                                 shd->board_info, NULL);
1387         if (!subdev) {
1388                 ret = -ENODEV;
1389                 goto ei2cnd;
1390         }
1391 
1392         client = v4l2_get_subdevdata(subdev);
1393 
1394         /* Use to_i2c_client(dev) to recover the i2c client */
1395         icd->control = &client->dev;
1396 
1397         return 0;
1398 ei2cnd:
1399         v4l2_clk_unregister(icd->clk);
1400         icd->clk = NULL;
1401 eclkreg:
1402         kfree(ssdd);
1403 ealloc:
1404         i2c_put_adapter(adap);
1405         return ret;
1406 }
1407 
1408 static void soc_camera_i2c_free(struct soc_camera_device *icd)
1409 {
1410         struct i2c_client *client =
1411                 to_i2c_client(to_soc_camera_control(icd));
1412         struct i2c_adapter *adap;
1413         struct soc_camera_subdev_desc *ssdd;
1414 
1415         icd->control = NULL;
1416         if (icd->sasc)
1417                 return;
1418 
1419         adap = client->adapter;
1420         ssdd = client->dev.platform_data;
1421         v4l2_device_unregister_subdev(i2c_get_clientdata(client));
1422         i2c_unregister_device(client);
1423         i2c_put_adapter(adap);
1424         kfree(ssdd);
1425         v4l2_clk_unregister(icd->clk);
1426         icd->clk = NULL;
1427 }
1428 
1429 /*
1430  * V4L2 asynchronous notifier callbacks. They are all called under a v4l2-async
1431  * internal global mutex, therefore cannot race against other asynchronous
1432  * events. Until notifier->complete() (soc_camera_async_complete()) is called,
1433  * the video device node is not registered and no V4L fops can occur. Unloading
1434  * of the host driver also calls a v4l2-async function, so also there we're
1435  * protected.
1436  */
1437 static int soc_camera_async_bound(struct v4l2_async_notifier *notifier,
1438                                   struct v4l2_subdev *sd,
1439                                   struct v4l2_async_subdev *asd)
1440 {
1441         struct soc_camera_async_client *sasc = container_of(notifier,
1442                                         struct soc_camera_async_client, notifier);
1443         struct soc_camera_device *icd = platform_get_drvdata(sasc->pdev);
1444 
1445         if (asd == sasc->sensor && !WARN_ON(icd->control)) {
1446                 struct i2c_client *client = v4l2_get_subdevdata(sd);
1447 
1448                 /*
1449                  * Only now we get subdevice-specific information like
1450                  * regulators, flags, callbacks, etc.
1451                  */
1452                 if (client) {
1453                         struct soc_camera_desc *sdesc = to_soc_camera_desc(icd);
1454                         struct soc_camera_subdev_desc *ssdd =
1455                                 soc_camera_i2c_to_desc(client);
1456                         if (ssdd) {
1457                                 memcpy(&sdesc->subdev_desc, ssdd,
1458                                        sizeof(sdesc->subdev_desc));
1459                                 if (ssdd->reset)
1460                                         ssdd->reset(&client->dev);
1461                         }
1462 
1463                         icd->control = &client->dev;
1464                 }
1465         }
1466 
1467         return 0;
1468 }
1469 
1470 static void soc_camera_async_unbind(struct v4l2_async_notifier *notifier,
1471                                     struct v4l2_subdev *sd,
1472                                     struct v4l2_async_subdev *asd)
1473 {
1474         struct soc_camera_async_client *sasc = container_of(notifier,
1475                                         struct soc_camera_async_client, notifier);
1476         struct soc_camera_device *icd = platform_get_drvdata(sasc->pdev);
1477 
1478         if (icd->clk) {
1479                 v4l2_clk_unregister(icd->clk);
1480                 icd->clk = NULL;
1481         }
1482 }
1483 
1484 static int soc_camera_async_complete(struct v4l2_async_notifier *notifier)
1485 {
1486         struct soc_camera_async_client *sasc = container_of(notifier,
1487                                         struct soc_camera_async_client, notifier);
1488         struct soc_camera_device *icd = platform_get_drvdata(sasc->pdev);
1489 
1490         if (to_soc_camera_control(icd)) {
1491                 struct soc_camera_host *ici = to_soc_camera_host(icd->parent);
1492                 int ret;
1493 
1494                 mutex_lock(&list_lock);
1495                 ret = soc_camera_probe(ici, icd);
1496                 mutex_unlock(&list_lock);
1497                 if (ret < 0)
1498                         return ret;
1499         }
1500 
1501         return 0;
1502 }
1503 
1504 static int scan_async_group(struct soc_camera_host *ici,
1505                             struct v4l2_async_subdev **asd, unsigned int size)
1506 {
1507         struct soc_camera_async_subdev *sasd;
1508         struct soc_camera_async_client *sasc;
1509         struct soc_camera_device *icd;
1510         struct soc_camera_desc sdesc = {.host_desc.bus_id = ici->nr,};
1511         char clk_name[V4L2_SUBDEV_NAME_SIZE];
1512         unsigned int i;
1513         int ret;
1514 
1515         /* First look for a sensor */
1516         for (i = 0; i < size; i++) {
1517                 sasd = container_of(asd[i], struct soc_camera_async_subdev, asd);
1518                 if (sasd->role == SOCAM_SUBDEV_DATA_SOURCE)
1519                         break;
1520         }
1521 
1522         if (i >= size || asd[i]->match_type != V4L2_ASYNC_MATCH_I2C) {
1523                 /* All useless */
1524                 dev_err(ici->v4l2_dev.dev, "No I2C data source found!\n");
1525                 return -ENODEV;
1526         }
1527 
1528         /* Or shall this be managed by the soc-camera device? */
1529         sasc = devm_kzalloc(ici->v4l2_dev.dev, sizeof(*sasc), GFP_KERNEL);
1530         if (!sasc)
1531                 return -ENOMEM;
1532 
1533         /* HACK: just need a != NULL */
1534         sdesc.host_desc.board_info = ERR_PTR(-ENODATA);
1535 
1536         ret = soc_camera_dyn_pdev(&sdesc, sasc);
1537         if (ret < 0)
1538                 goto eallocpdev;
1539 
1540         sasc->sensor = &sasd->asd;
1541 
1542         icd = soc_camera_add_pdev(sasc);
1543         if (!icd) {
1544                 ret = -ENOMEM;
1545                 goto eaddpdev;
1546         }
1547 
1548         sasc->notifier.subdevs = asd;
1549         sasc->notifier.num_subdevs = size;
1550         sasc->notifier.bound = soc_camera_async_bound;
1551         sasc->notifier.unbind = soc_camera_async_unbind;
1552         sasc->notifier.complete = soc_camera_async_complete;
1553 
1554         icd->sasc = sasc;
1555         icd->parent = ici->v4l2_dev.dev;
1556 
1557         snprintf(clk_name, sizeof(clk_name), "%d-%04x",
1558                  sasd->asd.match.i2c.adapter_id, sasd->asd.match.i2c.address);
1559 
1560         icd->clk = v4l2_clk_register(&soc_camera_clk_ops, clk_name, icd);
1561         if (IS_ERR(icd->clk)) {
1562                 ret = PTR_ERR(icd->clk);
1563                 goto eclkreg;
1564         }
1565 
1566         ret = v4l2_async_notifier_register(&ici->v4l2_dev, &sasc->notifier);
1567         if (!ret)
1568                 return 0;
1569 
1570         v4l2_clk_unregister(icd->clk);
1571 eclkreg:
1572         icd->clk = NULL;
1573         platform_device_del(sasc->pdev);
1574 eaddpdev:
1575         platform_device_put(sasc->pdev);
1576 eallocpdev:
1577         devm_kfree(ici->v4l2_dev.dev, sasc);
1578         dev_err(ici->v4l2_dev.dev, "group probe failed: %d\n", ret);
1579 
1580         return ret;
1581 }
1582 
1583 static void scan_async_host(struct soc_camera_host *ici)
1584 {
1585         struct v4l2_async_subdev **asd;
1586         int j;
1587 
1588         for (j = 0, asd = ici->asd; ici->asd_sizes[j]; j++) {
1589                 scan_async_group(ici, asd, ici->asd_sizes[j]);
1590                 asd += ici->asd_sizes[j];
1591         }
1592 }
1593 #else
1594 #define soc_camera_i2c_init(icd, sdesc) (-ENODEV)
1595 #define soc_camera_i2c_free(icd)        do {} while (0)
1596 #define scan_async_host(ici)            do {} while (0)
1597 #endif
1598 
1599 #ifdef CONFIG_OF
1600 
1601 struct soc_of_info {
1602         struct soc_camera_async_subdev  sasd;
1603         struct soc_camera_async_client  sasc;
1604         struct v4l2_async_subdev        *subdev;
1605 };
1606 
1607 static int soc_of_bind(struct soc_camera_host *ici,
1608                        struct device_node *ep,
1609                        struct device_node *remote)
1610 {
1611         struct soc_camera_device *icd;
1612         struct soc_camera_desc sdesc = {.host_desc.bus_id = ici->nr,};
1613         struct soc_camera_async_client *sasc;
1614         struct soc_of_info *info;
1615         struct i2c_client *client;
1616         char clk_name[V4L2_SUBDEV_NAME_SIZE];
1617         int ret;
1618 
1619         /* allocate a new subdev and add match info to it */
1620         info = devm_kzalloc(ici->v4l2_dev.dev, sizeof(struct soc_of_info),
1621                             GFP_KERNEL);
1622         if (!info)
1623                 return -ENOMEM;
1624 
1625         info->sasd.asd.match.of.node = remote;
1626         info->sasd.asd.match_type = V4L2_ASYNC_MATCH_OF;
1627         info->subdev = &info->sasd.asd;
1628 
1629         /* Or shall this be managed by the soc-camera device? */
1630         sasc = &info->sasc;
1631 
1632         /* HACK: just need a != NULL */
1633         sdesc.host_desc.board_info = ERR_PTR(-ENODATA);
1634 
1635         ret = soc_camera_dyn_pdev(&sdesc, sasc);
1636         if (ret < 0)
1637                 goto eallocpdev;
1638 
1639         sasc->sensor = &info->sasd.asd;
1640 
1641         icd = soc_camera_add_pdev(sasc);
1642         if (!icd) {
1643                 ret = -ENOMEM;
1644                 goto eaddpdev;
1645         }
1646 
1647         sasc->notifier.subdevs = &info->subdev;
1648         sasc->notifier.num_subdevs = 1;
1649         sasc->notifier.bound = soc_camera_async_bound;
1650         sasc->notifier.unbind = soc_camera_async_unbind;
1651         sasc->notifier.complete = soc_camera_async_complete;
1652 
1653         icd->sasc = sasc;
1654         icd->parent = ici->v4l2_dev.dev;
1655 
1656         client = of_find_i2c_device_by_node(remote);
1657 
1658         if (client)
1659                 snprintf(clk_name, sizeof(clk_name), "%d-%04x",
1660                          client->adapter->nr, client->addr);
1661         else
1662                 snprintf(clk_name, sizeof(clk_name), "of-%s",
1663                          of_node_full_name(remote));
1664 
1665         icd->clk = v4l2_clk_register(&soc_camera_clk_ops, clk_name, icd);
1666         if (IS_ERR(icd->clk)) {
1667                 ret = PTR_ERR(icd->clk);
1668                 goto eclkreg;
1669         }
1670 
1671         ret = v4l2_async_notifier_register(&ici->v4l2_dev, &sasc->notifier);
1672         if (!ret)
1673                 return 0;
1674 
1675         v4l2_clk_unregister(icd->clk);
1676 eclkreg:
1677         icd->clk = NULL;
1678         platform_device_del(sasc->pdev);
1679 eaddpdev:
1680         platform_device_put(sasc->pdev);
1681 eallocpdev:
1682         devm_kfree(ici->v4l2_dev.dev, info);
1683         dev_err(ici->v4l2_dev.dev, "group probe failed: %d\n", ret);
1684 
1685         return ret;
1686 }
1687 
1688 static void scan_of_host(struct soc_camera_host *ici)
1689 {
1690         struct device *dev = ici->v4l2_dev.dev;
1691         struct device_node *np = dev->of_node;
1692         struct device_node *epn = NULL, *ren;
1693         unsigned int i;
1694 
1695         for (i = 0; ; i++) {
1696                 epn = of_graph_get_next_endpoint(np, epn);
1697                 if (!epn)
1698                         break;
1699 
1700                 ren = of_graph_get_remote_port(epn);
1701                 if (!ren) {
1702                         dev_notice(dev, "no remote for %s\n",
1703                                    of_node_full_name(epn));
1704                         continue;
1705                 }
1706 
1707                 /* so we now have a remote node to connect */
1708                 if (!i)
1709                         soc_of_bind(ici, epn, ren->parent);
1710 
1711                 of_node_put(ren);
1712 
1713                 if (i) {
1714                         dev_err(dev, "multiple subdevices aren't supported yet!\n");
1715                         break;
1716                 }
1717         }
1718 
1719         of_node_put(epn);
1720 }
1721 
1722 #else
1723 static inline void scan_of_host(struct soc_camera_host *ici) { }
1724 #endif
1725 
1726 /* Called during host-driver probe */
1727 static int soc_camera_probe(struct soc_camera_host *ici,
1728                             struct soc_camera_device *icd)
1729 {
1730         struct soc_camera_desc *sdesc = to_soc_camera_desc(icd);
1731         struct soc_camera_host_desc *shd = &sdesc->host_desc;
1732         struct device *control = NULL;
1733         int ret;
1734 
1735         dev_info(icd->pdev, "Probing %s\n", dev_name(icd->pdev));
1736 
1737         /*
1738          * Currently the subdev with the largest number of controls (13) is
1739          * ov6550. So let's pick 16 as a hint for the control handler. Note
1740          * that this is a hint only: too large and you waste some memory, too
1741          * small and there is a (very) small performance hit when looking up
1742          * controls in the internal hash.
1743          */
1744         ret = v4l2_ctrl_handler_init(&icd->ctrl_handler, 16);
1745         if (ret < 0)
1746                 return ret;
1747 
1748         /* Must have icd->vdev before registering the device */
1749         ret = video_dev_create(icd);
1750         if (ret < 0)
1751                 goto evdc;
1752 
1753         /*
1754          * ..._video_start() will create a device node, video_register_device()
1755          * itself is protected against concurrent open() calls, but we also have
1756          * to protect our data also during client probing.
1757          */
1758 
1759         /* Non-i2c cameras, e.g., soc_camera_platform, have no board_info */
1760         if (shd->board_info) {
1761                 ret = soc_camera_i2c_init(icd, sdesc);
1762                 if (ret < 0 && ret != -EPROBE_DEFER)
1763                         goto eadd;
1764         } else if (!shd->add_device || !shd->del_device) {
1765                 ret = -EINVAL;
1766                 goto eadd;
1767         } else {
1768                 ret = soc_camera_clock_start(ici);
1769                 if (ret < 0)
1770                         goto eadd;
1771 
1772                 if (shd->module_name)
1773                         ret = request_module(shd->module_name);
1774 
1775                 ret = shd->add_device(icd);
1776                 if (ret < 0)
1777                         goto eadddev;
1778 
1779                 /*
1780                  * FIXME: this is racy, have to use driver-binding notification,
1781                  * when it is available
1782                  */
1783                 control = to_soc_camera_control(icd);
1784                 if (!control || !control->driver || !dev_get_drvdata(control) ||
1785                     !try_module_get(control->driver->owner)) {
1786                         shd->del_device(icd);
1787                         ret = -ENODEV;
1788                         goto enodrv;
1789                 }
1790         }
1791 
1792         mutex_lock(&ici->host_lock);
1793         ret = soc_camera_probe_finish(icd);
1794         mutex_unlock(&ici->host_lock);
1795         if (ret < 0)
1796                 goto efinish;
1797 
1798         return 0;
1799 
1800 efinish:
1801         if (shd->board_info) {
1802                 soc_camera_i2c_free(icd);
1803         } else {
1804                 shd->del_device(icd);
1805                 module_put(control->driver->owner);
1806 enodrv:
1807 eadddev:
1808                 soc_camera_clock_stop(ici);
1809         }
1810 eadd:
1811         if (icd->vdev) {
1812                 video_device_release(icd->vdev);
1813                 icd->vdev = NULL;
1814         }
1815 evdc:
1816         v4l2_ctrl_handler_free(&icd->ctrl_handler);
1817         return ret;
1818 }
1819 
1820 /*
1821  * This is called on device_unregister, which only means we have to disconnect
1822  * from the host, but not remove ourselves from the device list. With
1823  * asynchronous client probing this can also be called without
1824  * soc_camera_probe_finish() having run. Careful with clean up.
1825  */
1826 static int soc_camera_remove(struct soc_camera_device *icd)
1827 {
1828         struct soc_camera_desc *sdesc = to_soc_camera_desc(icd);
1829         struct video_device *vdev = icd->vdev;
1830 
1831         v4l2_ctrl_handler_free(&icd->ctrl_handler);
1832         if (vdev) {
1833                 video_unregister_device(vdev);
1834                 icd->vdev = NULL;
1835         }
1836 
1837         if (sdesc->host_desc.board_info) {
1838                 soc_camera_i2c_free(icd);
1839         } else {
1840                 struct device *dev = to_soc_camera_control(icd);
1841                 struct device_driver *drv = dev ? dev->driver : NULL;
1842                 if (drv) {
1843                         sdesc->host_desc.del_device(icd);
1844                         module_put(drv->owner);
1845                 }
1846         }
1847 
1848         if (icd->num_user_formats)
1849                 soc_camera_free_user_formats(icd);
1850 
1851         if (icd->clk) {
1852                 /* For the synchronous case */
1853                 v4l2_clk_unregister(icd->clk);
1854                 icd->clk = NULL;
1855         }
1856 
1857         if (icd->sasc)
1858                 platform_device_unregister(icd->sasc->pdev);
1859 
1860         return 0;
1861 }
1862 
1863 static int default_cropcap(struct soc_camera_device *icd,
1864                            struct v4l2_cropcap *a)
1865 {
1866         struct v4l2_subdev *sd = soc_camera_to_subdev(icd);
1867         return v4l2_subdev_call(sd, video, cropcap, a);
1868 }
1869 
1870 static int default_g_crop(struct soc_camera_device *icd, struct v4l2_crop *a)
1871 {
1872         struct v4l2_subdev *sd = soc_camera_to_subdev(icd);
1873         return v4l2_subdev_call(sd, video, g_crop, a);
1874 }
1875 
1876 static int default_s_crop(struct soc_camera_device *icd, const struct v4l2_crop *a)
1877 {
1878         struct v4l2_subdev *sd = soc_camera_to_subdev(icd);
1879         return v4l2_subdev_call(sd, video, s_crop, a);
1880 }
1881 
1882 static int default_g_parm(struct soc_camera_device *icd,
1883                           struct v4l2_streamparm *parm)
1884 {
1885         struct v4l2_subdev *sd = soc_camera_to_subdev(icd);
1886         return v4l2_subdev_call(sd, video, g_parm, parm);
1887 }
1888 
1889 static int default_s_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, s_parm, parm);
1894 }
1895 
1896 static int default_enum_framesizes(struct soc_camera_device *icd,
1897                                    struct v4l2_frmsizeenum *fsize)
1898 {
1899         int ret;
1900         struct v4l2_subdev *sd = soc_camera_to_subdev(icd);
1901         const struct soc_camera_format_xlate *xlate;
1902         struct v4l2_subdev_frame_size_enum fse = {
1903                 .index = fsize->index,
1904                 .which = V4L2_SUBDEV_FORMAT_ACTIVE,
1905         };
1906 
1907         xlate = soc_camera_xlate_by_fourcc(icd, fsize->pixel_format);
1908         if (!xlate)
1909                 return -EINVAL;
1910         fse.code = xlate->code;
1911 
1912         ret = v4l2_subdev_call(sd, pad, enum_frame_size, NULL, &fse);
1913         if (ret < 0)
1914                 return ret;
1915 
1916         if (fse.min_width == fse.max_width &&
1917             fse.min_height == fse.max_height) {
1918                 fsize->type = V4L2_FRMSIZE_TYPE_DISCRETE;
1919                 fsize->discrete.width = fse.min_width;
1920                 fsize->discrete.height = fse.min_height;
1921                 return 0;
1922         }
1923         fsize->type = V4L2_FRMSIZE_TYPE_CONTINUOUS;
1924         fsize->stepwise.min_width = fse.min_width;
1925         fsize->stepwise.max_width = fse.max_width;
1926         fsize->stepwise.min_height = fse.min_height;
1927         fsize->stepwise.max_height = fse.max_height;
1928         fsize->stepwise.step_width = 1;
1929         fsize->stepwise.step_height = 1;
1930         return 0;
1931 }
1932 
1933 int soc_camera_host_register(struct soc_camera_host *ici)
1934 {
1935         struct soc_camera_host *ix;
1936         int ret;
1937 
1938         if (!ici || !ici->ops ||
1939             !ici->ops->try_fmt ||
1940             !ici->ops->set_fmt ||
1941             !ici->ops->set_bus_param ||
1942             !ici->ops->querycap ||
1943             ((!ici->ops->init_videobuf ||
1944               !ici->ops->reqbufs) &&
1945              !ici->ops->init_videobuf2) ||
1946             !ici->ops->poll ||
1947             !ici->v4l2_dev.dev)
1948                 return -EINVAL;
1949 
1950         if (!ici->ops->set_crop)
1951                 ici->ops->set_crop = default_s_crop;
1952         if (!ici->ops->get_crop)
1953                 ici->ops->get_crop = default_g_crop;
1954         if (!ici->ops->cropcap)
1955                 ici->ops->cropcap = default_cropcap;
1956         if (!ici->ops->set_parm)
1957                 ici->ops->set_parm = default_s_parm;
1958         if (!ici->ops->get_parm)
1959                 ici->ops->get_parm = default_g_parm;
1960         if (!ici->ops->enum_framesizes)
1961                 ici->ops->enum_framesizes = default_enum_framesizes;
1962 
1963         mutex_lock(&list_lock);
1964         list_for_each_entry(ix, &hosts, list) {
1965                 if (ix->nr == ici->nr) {
1966                         ret = -EBUSY;
1967                         goto edevreg;
1968                 }
1969         }
1970 
1971         ret = v4l2_device_register(ici->v4l2_dev.dev, &ici->v4l2_dev);
1972         if (ret < 0)
1973                 goto edevreg;
1974 
1975         list_add_tail(&ici->list, &hosts);
1976         mutex_unlock(&list_lock);
1977 
1978         mutex_init(&ici->host_lock);
1979         mutex_init(&ici->clk_lock);
1980 
1981         if (ici->v4l2_dev.dev->of_node)
1982                 scan_of_host(ici);
1983         else if (ici->asd_sizes)
1984                 /*
1985                  * No OF, host with a list of subdevices. Don't try to mix
1986                  * modes by initialising some groups statically and some
1987                  * dynamically!
1988                  */
1989                 scan_async_host(ici);
1990         else
1991                 /* Legacy: static platform devices from board data */
1992                 scan_add_host(ici);
1993 
1994         return 0;
1995 
1996 edevreg:
1997         mutex_unlock(&list_lock);
1998         return ret;
1999 }
2000 EXPORT_SYMBOL(soc_camera_host_register);
2001 
2002 /* Unregister all clients! */
2003 void soc_camera_host_unregister(struct soc_camera_host *ici)
2004 {
2005         struct soc_camera_device *icd, *tmp;
2006         struct soc_camera_async_client *sasc;
2007         LIST_HEAD(notifiers);
2008 
2009         mutex_lock(&list_lock);
2010         list_del(&ici->list);
2011         list_for_each_entry(icd, &devices, list)
2012                 if (icd->iface == ici->nr && icd->sasc) {
2013                         /* as long as we hold the device, sasc won't be freed */
2014                         get_device(icd->pdev);
2015                         list_add(&icd->sasc->list, &notifiers);
2016                 }
2017         mutex_unlock(&list_lock);
2018 
2019         list_for_each_entry(sasc, &notifiers, list) {
2020                 /* Must call unlocked to avoid AB-BA dead-lock */
2021                 v4l2_async_notifier_unregister(&sasc->notifier);
2022                 put_device(&sasc->pdev->dev);
2023         }
2024 
2025         mutex_lock(&list_lock);
2026 
2027         list_for_each_entry_safe(icd, tmp, &devices, list)
2028                 if (icd->iface == ici->nr)
2029                         soc_camera_remove(icd);
2030 
2031         mutex_unlock(&list_lock);
2032 
2033         v4l2_device_unregister(&ici->v4l2_dev);
2034 }
2035 EXPORT_SYMBOL(soc_camera_host_unregister);
2036 
2037 /* Image capture device */
2038 static int soc_camera_device_register(struct soc_camera_device *icd)
2039 {
2040         struct soc_camera_device *ix;
2041         int num = -1, i;
2042 
2043         mutex_lock(&list_lock);
2044         for (i = 0; i < 256 && num < 0; i++) {
2045                 num = i;
2046                 /* Check if this index is available on this interface */
2047                 list_for_each_entry(ix, &devices, list) {
2048                         if (ix->iface == icd->iface && ix->devnum == i) {
2049                                 num = -1;
2050                                 break;
2051                         }
2052                 }
2053         }
2054 
2055         if (num < 0) {
2056                 /*
2057                  * ok, we have 256 cameras on this host...
2058                  * man, stay reasonable...
2059                  */
2060                 mutex_unlock(&list_lock);
2061                 return -ENOMEM;
2062         }
2063 
2064         icd->devnum             = num;
2065         icd->use_count          = 0;
2066         icd->host_priv          = NULL;
2067 
2068         /*
2069          * Dynamically allocated devices set the bit earlier, but it doesn't hurt setting
2070          * it again
2071          */
2072         i = to_platform_device(icd->pdev)->id;
2073         if (i < 0)
2074                 /* One static (legacy) soc-camera platform device */
2075                 i = 0;
2076         if (i >= MAP_MAX_NUM) {
2077                 mutex_unlock(&list_lock);
2078                 return -EBUSY;
2079         }
2080         set_bit(i, device_map);
2081         list_add_tail(&icd->list, &devices);
2082         mutex_unlock(&list_lock);
2083 
2084         return 0;
2085 }
2086 
2087 static const struct v4l2_ioctl_ops soc_camera_ioctl_ops = {
2088         .vidioc_querycap         = soc_camera_querycap,
2089         .vidioc_try_fmt_vid_cap  = soc_camera_try_fmt_vid_cap,
2090         .vidioc_g_fmt_vid_cap    = soc_camera_g_fmt_vid_cap,
2091         .vidioc_s_fmt_vid_cap    = soc_camera_s_fmt_vid_cap,
2092         .vidioc_enum_fmt_vid_cap = soc_camera_enum_fmt_vid_cap,
2093         .vidioc_enum_input       = soc_camera_enum_input,
2094         .vidioc_g_input          = soc_camera_g_input,
2095         .vidioc_s_input          = soc_camera_s_input,
2096         .vidioc_s_std            = soc_camera_s_std,
2097         .vidioc_g_std            = soc_camera_g_std,
2098         .vidioc_enum_framesizes  = soc_camera_enum_framesizes,
2099         .vidioc_reqbufs          = soc_camera_reqbufs,
2100         .vidioc_querybuf         = soc_camera_querybuf,
2101         .vidioc_qbuf             = soc_camera_qbuf,
2102         .vidioc_dqbuf            = soc_camera_dqbuf,
2103         .vidioc_create_bufs      = soc_camera_create_bufs,
2104         .vidioc_prepare_buf      = soc_camera_prepare_buf,
2105         .vidioc_expbuf           = soc_camera_expbuf,
2106         .vidioc_streamon         = soc_camera_streamon,
2107         .vidioc_streamoff        = soc_camera_streamoff,
2108         .vidioc_cropcap          = soc_camera_cropcap,
2109         .vidioc_g_crop           = soc_camera_g_crop,
2110         .vidioc_s_crop           = soc_camera_s_crop,
2111         .vidioc_g_selection      = soc_camera_g_selection,
2112         .vidioc_s_selection      = soc_camera_s_selection,
2113         .vidioc_g_parm           = soc_camera_g_parm,
2114         .vidioc_s_parm           = soc_camera_s_parm,
2115 };
2116 
2117 static int video_dev_create(struct soc_camera_device *icd)
2118 {
2119         struct soc_camera_host *ici = to_soc_camera_host(icd->parent);
2120         struct video_device *vdev = video_device_alloc();
2121 
2122         if (!vdev)
2123                 return -ENOMEM;
2124 
2125         strlcpy(vdev->name, ici->drv_name, sizeof(vdev->name));
2126 
2127         vdev->v4l2_dev          = &ici->v4l2_dev;
2128         vdev->fops              = &soc_camera_fops;
2129         vdev->ioctl_ops         = &soc_camera_ioctl_ops;
2130         vdev->release           = video_device_release;
2131         vdev->ctrl_handler      = &icd->ctrl_handler;
2132         vdev->lock              = &ici->host_lock;
2133 
2134         icd->vdev = vdev;
2135 
2136         return 0;
2137 }
2138 
2139 /*
2140  * Called from soc_camera_probe() above with .host_lock held
2141  */
2142 static int soc_camera_video_start(struct soc_camera_device *icd)
2143 {
2144         const struct device_type *type = icd->vdev->dev.type;
2145         int ret;
2146 
2147         if (!icd->parent)
2148                 return -ENODEV;
2149 
2150         video_set_drvdata(icd->vdev, icd);
2151         if (icd->vdev->tvnorms == 0) {
2152                 /* disable the STD API if there are no tvnorms defined */
2153                 v4l2_disable_ioctl(icd->vdev, VIDIOC_G_STD);
2154                 v4l2_disable_ioctl(icd->vdev, VIDIOC_S_STD);
2155                 v4l2_disable_ioctl(icd->vdev, VIDIOC_ENUMSTD);
2156         }
2157         ret = video_register_device(icd->vdev, VFL_TYPE_GRABBER, -1);
2158         if (ret < 0) {
2159                 dev_err(icd->pdev, "video_register_device failed: %d\n", ret);
2160                 return ret;
2161         }
2162 
2163         /* Restore device type, possibly set by the subdevice driver */
2164         icd->vdev->dev.type = type;
2165 
2166         return 0;
2167 }
2168 
2169 static int soc_camera_pdrv_probe(struct platform_device *pdev)
2170 {
2171         struct soc_camera_desc *sdesc = pdev->dev.platform_data;
2172         struct soc_camera_subdev_desc *ssdd = &sdesc->subdev_desc;
2173         struct soc_camera_device *icd;
2174         int ret;
2175 
2176         if (!sdesc)
2177                 return -EINVAL;
2178 
2179         icd = devm_kzalloc(&pdev->dev, sizeof(*icd), GFP_KERNEL);
2180         if (!icd)
2181                 return -ENOMEM;
2182 
2183         /*
2184          * In the asynchronous case ssdd->num_regulators == 0 yet, so, the below
2185          * regulator allocation is a dummy. They are actually requested by the
2186          * subdevice driver, using soc_camera_power_init(). Also note, that in
2187          * that case regulators are attached to the I2C device and not to the
2188          * camera platform device.
2189          */
2190         ret = devm_regulator_bulk_get(&pdev->dev, ssdd->sd_pdata.num_regulators,
2191                                       ssdd->sd_pdata.regulators);
2192         if (ret < 0)
2193                 return ret;
2194 
2195         icd->iface = sdesc->host_desc.bus_id;
2196         icd->sdesc = sdesc;
2197         icd->pdev = &pdev->dev;
2198         platform_set_drvdata(pdev, icd);
2199 
2200         icd->user_width         = DEFAULT_WIDTH;
2201         icd->user_height        = DEFAULT_HEIGHT;
2202 
2203         return soc_camera_device_register(icd);
2204 }
2205 
2206 /*
2207  * Only called on rmmod for each platform device, since they are not
2208  * hot-pluggable. Now we know, that all our users - hosts and devices have
2209  * been unloaded already
2210  */
2211 static int soc_camera_pdrv_remove(struct platform_device *pdev)
2212 {
2213         struct soc_camera_device *icd = platform_get_drvdata(pdev);
2214         int i;
2215 
2216         if (!icd)
2217                 return -EINVAL;
2218 
2219         i = pdev->id;
2220         if (i < 0)
2221                 i = 0;
2222 
2223         /*
2224          * In synchronous mode with static platform devices this is called in a
2225          * loop from drivers/base/dd.c::driver_detach(), no parallel execution,
2226          * no need to lock. In asynchronous case the caller -
2227          * soc_camera_host_unregister() - already holds the lock
2228          */
2229         if (test_bit(i, device_map)) {
2230                 clear_bit(i, device_map);
2231                 list_del(&icd->list);
2232         }
2233 
2234         return 0;
2235 }
2236 
2237 static struct platform_driver __refdata soc_camera_pdrv = {
2238         .probe = soc_camera_pdrv_probe,
2239         .remove  = soc_camera_pdrv_remove,
2240         .driver  = {
2241                 .name   = "soc-camera-pdrv",
2242         },
2243 };
2244 
2245 module_platform_driver(soc_camera_pdrv);
2246 
2247 MODULE_DESCRIPTION("Image capture bus driver");
2248 MODULE_AUTHOR("Guennadi Liakhovetski <kernel@pengutronix.de>");
2249 MODULE_LICENSE("GPL");
2250 MODULE_ALIAS("platform:soc-camera-pdrv");
2251 

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