Version:  2.0.40 2.2.26 2.4.37 3.12 3.13 3.14 3.15 3.16 3.17 3.18 3.19 4.0 4.1 4.2 4.3 4.4 4.5 4.6 4.7 4.8 4.9

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/drv-intf/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-v4l2.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         struct soc_camera_device *icd = file->private_data;
313 
314         if (inp->index != 0)
315                 return -EINVAL;
316 
317         /* default is camera */
318         inp->type = V4L2_INPUT_TYPE_CAMERA;
319         inp->std = icd->vdev->tvnorms;
320         strcpy(inp->name, "Camera");
321 
322         return 0;
323 }
324 
325 static int soc_camera_g_input(struct file *file, void *priv, unsigned int *i)
326 {
327         *i = 0;
328 
329         return 0;
330 }
331 
332 static int soc_camera_s_input(struct file *file, void *priv, unsigned int i)
333 {
334         if (i > 0)
335                 return -EINVAL;
336 
337         return 0;
338 }
339 
340 static int soc_camera_s_std(struct file *file, void *priv, v4l2_std_id a)
341 {
342         struct soc_camera_device *icd = file->private_data;
343         struct v4l2_subdev *sd = soc_camera_to_subdev(icd);
344 
345         return v4l2_subdev_call(sd, video, s_std, a);
346 }
347 
348 static int soc_camera_g_std(struct file *file, void *priv, v4l2_std_id *a)
349 {
350         struct soc_camera_device *icd = file->private_data;
351         struct v4l2_subdev *sd = soc_camera_to_subdev(icd);
352 
353         return v4l2_subdev_call(sd, video, g_std, a);
354 }
355 
356 static int soc_camera_enum_framesizes(struct file *file, void *fh,
357                                          struct v4l2_frmsizeenum *fsize)
358 {
359         struct soc_camera_device *icd = file->private_data;
360         struct soc_camera_host *ici = to_soc_camera_host(icd->parent);
361 
362         return ici->ops->enum_framesizes(icd, fsize);
363 }
364 
365 static int soc_camera_reqbufs(struct file *file, void *priv,
366                               struct v4l2_requestbuffers *p)
367 {
368         int ret;
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 (icd->streamer && icd->streamer != file)
375                 return -EBUSY;
376 
377         if (ici->ops->init_videobuf) {
378                 ret = videobuf_reqbufs(&icd->vb_vidq, p);
379                 if (ret < 0)
380                         return ret;
381 
382                 ret = ici->ops->reqbufs(icd, p);
383         } else {
384                 ret = vb2_reqbufs(&icd->vb2_vidq, p);
385         }
386 
387         if (!ret)
388                 icd->streamer = p->count ? file : NULL;
389         return ret;
390 }
391 
392 static int soc_camera_querybuf(struct file *file, void *priv,
393                                struct v4l2_buffer *p)
394 {
395         struct soc_camera_device *icd = file->private_data;
396         struct soc_camera_host *ici = to_soc_camera_host(icd->parent);
397 
398         WARN_ON(priv != file->private_data);
399 
400         if (ici->ops->init_videobuf)
401                 return videobuf_querybuf(&icd->vb_vidq, p);
402         else
403                 return vb2_querybuf(&icd->vb2_vidq, p);
404 }
405 
406 static int soc_camera_qbuf(struct file *file, void *priv,
407                            struct v4l2_buffer *p)
408 {
409         struct soc_camera_device *icd = file->private_data;
410         struct soc_camera_host *ici = to_soc_camera_host(icd->parent);
411 
412         WARN_ON(priv != file->private_data);
413 
414         if (icd->streamer != file)
415                 return -EBUSY;
416 
417         if (ici->ops->init_videobuf)
418                 return videobuf_qbuf(&icd->vb_vidq, p);
419         else
420                 return vb2_qbuf(&icd->vb2_vidq, p);
421 }
422 
423 static int soc_camera_dqbuf(struct file *file, void *priv,
424                             struct v4l2_buffer *p)
425 {
426         struct soc_camera_device *icd = file->private_data;
427         struct soc_camera_host *ici = to_soc_camera_host(icd->parent);
428 
429         WARN_ON(priv != file->private_data);
430 
431         if (icd->streamer != file)
432                 return -EBUSY;
433 
434         if (ici->ops->init_videobuf)
435                 return videobuf_dqbuf(&icd->vb_vidq, p, file->f_flags & O_NONBLOCK);
436         else
437                 return vb2_dqbuf(&icd->vb2_vidq, p, file->f_flags & O_NONBLOCK);
438 }
439 
440 static int soc_camera_create_bufs(struct file *file, void *priv,
441                             struct v4l2_create_buffers *create)
442 {
443         struct soc_camera_device *icd = file->private_data;
444         struct soc_camera_host *ici = to_soc_camera_host(icd->parent);
445         int ret;
446 
447         /* videobuf2 only */
448         if (ici->ops->init_videobuf)
449                 return -ENOTTY;
450 
451         if (icd->streamer && icd->streamer != file)
452                 return -EBUSY;
453 
454         ret = vb2_create_bufs(&icd->vb2_vidq, create);
455         if (!ret)
456                 icd->streamer = file;
457         return ret;
458 }
459 
460 static int soc_camera_prepare_buf(struct file *file, void *priv,
461                                   struct v4l2_buffer *b)
462 {
463         struct soc_camera_device *icd = file->private_data;
464         struct soc_camera_host *ici = to_soc_camera_host(icd->parent);
465 
466         /* videobuf2 only */
467         if (ici->ops->init_videobuf)
468                 return -EINVAL;
469         else
470                 return vb2_prepare_buf(&icd->vb2_vidq, b);
471 }
472 
473 static int soc_camera_expbuf(struct file *file, void *priv,
474                              struct v4l2_exportbuffer *p)
475 {
476         struct soc_camera_device *icd = file->private_data;
477         struct soc_camera_host *ici = to_soc_camera_host(icd->parent);
478 
479         /* videobuf2 only */
480         if (ici->ops->init_videobuf)
481                 return -ENOTTY;
482 
483         if (icd->streamer && icd->streamer != file)
484                 return -EBUSY;
485         return vb2_expbuf(&icd->vb2_vidq, p);
486 }
487 
488 /* Always entered with .host_lock held */
489 static int soc_camera_init_user_formats(struct soc_camera_device *icd)
490 {
491         struct v4l2_subdev *sd = soc_camera_to_subdev(icd);
492         struct soc_camera_host *ici = to_soc_camera_host(icd->parent);
493         unsigned int i, fmts = 0, raw_fmts = 0;
494         int ret;
495         struct v4l2_subdev_mbus_code_enum code = {
496                 .which = V4L2_SUBDEV_FORMAT_ACTIVE,
497         };
498 
499         while (!v4l2_subdev_call(sd, pad, enum_mbus_code, NULL, &code)) {
500                 raw_fmts++;
501                 code.index++;
502         }
503 
504         if (!ici->ops->get_formats)
505                 /*
506                  * Fallback mode - the host will have to serve all
507                  * sensor-provided formats one-to-one to the user
508                  */
509                 fmts = raw_fmts;
510         else
511                 /*
512                  * First pass - only count formats this host-sensor
513                  * configuration can provide
514                  */
515                 for (i = 0; i < raw_fmts; i++) {
516                         ret = ici->ops->get_formats(icd, i, NULL);
517                         if (ret < 0)
518                                 return ret;
519                         fmts += ret;
520                 }
521 
522         if (!fmts)
523                 return -ENXIO;
524 
525         icd->user_formats =
526                 vmalloc(fmts * sizeof(struct soc_camera_format_xlate));
527         if (!icd->user_formats)
528                 return -ENOMEM;
529 
530         dev_dbg(icd->pdev, "Found %d supported formats.\n", fmts);
531 
532         /* Second pass - actually fill data formats */
533         fmts = 0;
534         for (i = 0; i < raw_fmts; i++)
535                 if (!ici->ops->get_formats) {
536                         code.index = i;
537                         v4l2_subdev_call(sd, pad, enum_mbus_code, NULL, &code);
538                         icd->user_formats[fmts].host_fmt =
539                                 soc_mbus_get_fmtdesc(code.code);
540                         if (icd->user_formats[fmts].host_fmt)
541                                 icd->user_formats[fmts++].code = code.code;
542                 } else {
543                         ret = ici->ops->get_formats(icd, i,
544                                                     &icd->user_formats[fmts]);
545                         if (ret < 0)
546                                 goto egfmt;
547                         fmts += ret;
548                 }
549 
550         icd->num_user_formats = fmts;
551         icd->current_fmt = &icd->user_formats[0];
552 
553         return 0;
554 
555 egfmt:
556         vfree(icd->user_formats);
557         return ret;
558 }
559 
560 /* Always entered with .host_lock held */
561 static void soc_camera_free_user_formats(struct soc_camera_device *icd)
562 {
563         struct soc_camera_host *ici = to_soc_camera_host(icd->parent);
564 
565         if (ici->ops->put_formats)
566                 ici->ops->put_formats(icd);
567         icd->current_fmt = NULL;
568         icd->num_user_formats = 0;
569         vfree(icd->user_formats);
570         icd->user_formats = NULL;
571 }
572 
573 /* Called with .vb_lock held, or from the first open(2), see comment there */
574 static int soc_camera_set_fmt(struct soc_camera_device *icd,
575                               struct v4l2_format *f)
576 {
577         struct soc_camera_host *ici = to_soc_camera_host(icd->parent);
578         struct v4l2_pix_format *pix = &f->fmt.pix;
579         int ret;
580 
581         dev_dbg(icd->pdev, "S_FMT(%c%c%c%c, %ux%u)\n",
582                 pixfmtstr(pix->pixelformat), pix->width, pix->height);
583 
584         /* We always call try_fmt() before set_fmt() or set_selection() */
585         ret = soc_camera_try_fmt(icd, f);
586         if (ret < 0)
587                 return ret;
588 
589         ret = ici->ops->set_fmt(icd, f);
590         if (ret < 0) {
591                 return ret;
592         } else if (!icd->current_fmt ||
593                    icd->current_fmt->host_fmt->fourcc != pix->pixelformat) {
594                 dev_err(icd->pdev,
595                         "Host driver hasn't set up current format correctly!\n");
596                 return -EINVAL;
597         }
598 
599         icd->user_width         = pix->width;
600         icd->user_height        = pix->height;
601         icd->bytesperline       = pix->bytesperline;
602         icd->sizeimage          = pix->sizeimage;
603         icd->colorspace         = pix->colorspace;
604         icd->field              = pix->field;
605         if (ici->ops->init_videobuf)
606                 icd->vb_vidq.field = pix->field;
607 
608         dev_dbg(icd->pdev, "set width: %d height: %d\n",
609                 icd->user_width, icd->user_height);
610 
611         /* set physical bus parameters */
612         return ici->ops->set_bus_param(icd);
613 }
614 
615 static int soc_camera_add_device(struct soc_camera_device *icd)
616 {
617         struct soc_camera_host *ici = to_soc_camera_host(icd->parent);
618         int ret;
619 
620         if (ici->icd)
621                 return -EBUSY;
622 
623         if (!icd->clk) {
624                 ret = soc_camera_clock_start(ici);
625                 if (ret < 0)
626                         return ret;
627         }
628 
629         if (ici->ops->add) {
630                 ret = ici->ops->add(icd);
631                 if (ret < 0)
632                         goto eadd;
633         }
634 
635         ici->icd = icd;
636 
637         return 0;
638 
639 eadd:
640         if (!icd->clk)
641                 soc_camera_clock_stop(ici);
642         return ret;
643 }
644 
645 static void soc_camera_remove_device(struct soc_camera_device *icd)
646 {
647         struct soc_camera_host *ici = to_soc_camera_host(icd->parent);
648 
649         if (WARN_ON(icd != ici->icd))
650                 return;
651 
652         if (ici->ops->remove)
653                 ici->ops->remove(icd);
654         if (!icd->clk)
655                 soc_camera_clock_stop(ici);
656         ici->icd = NULL;
657 }
658 
659 static int soc_camera_open(struct file *file)
660 {
661         struct video_device *vdev = video_devdata(file);
662         struct soc_camera_device *icd;
663         struct soc_camera_host *ici;
664         int ret;
665 
666         /*
667          * Don't mess with the host during probe: wait until the loop in
668          * scan_add_host() completes. Also protect against a race with
669          * soc_camera_host_unregister().
670          */
671         if (mutex_lock_interruptible(&list_lock))
672                 return -ERESTARTSYS;
673 
674         if (!vdev || !video_is_registered(vdev)) {
675                 mutex_unlock(&list_lock);
676                 return -ENODEV;
677         }
678 
679         icd = video_get_drvdata(vdev);
680         ici = to_soc_camera_host(icd->parent);
681 
682         ret = try_module_get(ici->ops->owner) ? 0 : -ENODEV;
683         mutex_unlock(&list_lock);
684 
685         if (ret < 0) {
686                 dev_err(icd->pdev, "Couldn't lock capture bus driver.\n");
687                 return ret;
688         }
689 
690         if (!to_soc_camera_control(icd)) {
691                 /* No device driver attached */
692                 ret = -ENODEV;
693                 goto econtrol;
694         }
695 
696         if (mutex_lock_interruptible(&ici->host_lock)) {
697                 ret = -ERESTARTSYS;
698                 goto elockhost;
699         }
700         icd->use_count++;
701 
702         /* Now we really have to activate the camera */
703         if (icd->use_count == 1) {
704                 struct soc_camera_desc *sdesc = to_soc_camera_desc(icd);
705                 /* Restore parameters before the last close() per V4L2 API */
706                 struct v4l2_format f = {
707                         .type = V4L2_BUF_TYPE_VIDEO_CAPTURE,
708                         .fmt.pix = {
709                                 .width          = icd->user_width,
710                                 .height         = icd->user_height,
711                                 .field          = icd->field,
712                                 .colorspace     = icd->colorspace,
713                                 .pixelformat    =
714                                         icd->current_fmt->host_fmt->fourcc,
715                         },
716                 };
717 
718                 /* The camera could have been already on, try to reset */
719                 if (sdesc->subdev_desc.reset)
720                         if (icd->control)
721                                 sdesc->subdev_desc.reset(icd->control);
722 
723                 ret = soc_camera_add_device(icd);
724                 if (ret < 0) {
725                         dev_err(icd->pdev, "Couldn't activate the camera: %d\n", ret);
726                         goto eiciadd;
727                 }
728 
729                 ret = __soc_camera_power_on(icd);
730                 if (ret < 0)
731                         goto epower;
732 
733                 pm_runtime_enable(&icd->vdev->dev);
734                 ret = pm_runtime_resume(&icd->vdev->dev);
735                 if (ret < 0 && ret != -ENOSYS)
736                         goto eresume;
737 
738                 /*
739                  * Try to configure with default parameters. Notice: this is the
740                  * very first open, so, we cannot race against other calls,
741                  * apart from someone else calling open() simultaneously, but
742                  * .host_lock is protecting us against it.
743                  */
744                 ret = soc_camera_set_fmt(icd, &f);
745                 if (ret < 0)
746                         goto esfmt;
747 
748                 if (ici->ops->init_videobuf) {
749                         ici->ops->init_videobuf(&icd->vb_vidq, icd);
750                 } else {
751                         ret = ici->ops->init_videobuf2(&icd->vb2_vidq, icd);
752                         if (ret < 0)
753                                 goto einitvb;
754                 }
755                 v4l2_ctrl_handler_setup(&icd->ctrl_handler);
756         }
757         mutex_unlock(&ici->host_lock);
758 
759         file->private_data = icd;
760         dev_dbg(icd->pdev, "camera device open\n");
761 
762         return 0;
763 
764         /*
765          * All errors are entered with the .host_lock held, first four also
766          * with use_count == 1
767          */
768 einitvb:
769 esfmt:
770         pm_runtime_disable(&icd->vdev->dev);
771 eresume:
772         __soc_camera_power_off(icd);
773 epower:
774         soc_camera_remove_device(icd);
775 eiciadd:
776         icd->use_count--;
777         mutex_unlock(&ici->host_lock);
778 elockhost:
779 econtrol:
780         module_put(ici->ops->owner);
781 
782         return ret;
783 }
784 
785 static int soc_camera_close(struct file *file)
786 {
787         struct soc_camera_device *icd = file->private_data;
788         struct soc_camera_host *ici = to_soc_camera_host(icd->parent);
789 
790         mutex_lock(&ici->host_lock);
791         if (icd->streamer == file) {
792                 if (ici->ops->init_videobuf2)
793                         vb2_queue_release(&icd->vb2_vidq);
794                 icd->streamer = NULL;
795         }
796         icd->use_count--;
797         if (!icd->use_count) {
798                 pm_runtime_suspend(&icd->vdev->dev);
799                 pm_runtime_disable(&icd->vdev->dev);
800 
801                 __soc_camera_power_off(icd);
802 
803                 soc_camera_remove_device(icd);
804         }
805 
806         mutex_unlock(&ici->host_lock);
807 
808         module_put(ici->ops->owner);
809 
810         dev_dbg(icd->pdev, "camera device close\n");
811 
812         return 0;
813 }
814 
815 static ssize_t soc_camera_read(struct file *file, char __user *buf,
816                                size_t count, loff_t *ppos)
817 {
818         struct soc_camera_device *icd = file->private_data;
819         struct soc_camera_host *ici = to_soc_camera_host(icd->parent);
820 
821         dev_dbg(icd->pdev, "read called, buf %p\n", buf);
822 
823         if (ici->ops->init_videobuf2 && icd->vb2_vidq.io_modes & VB2_READ)
824                 return vb2_read(&icd->vb2_vidq, buf, count, ppos,
825                                 file->f_flags & O_NONBLOCK);
826 
827         dev_err(icd->pdev, "camera device read not implemented\n");
828 
829         return -EINVAL;
830 }
831 
832 static int soc_camera_mmap(struct file *file, struct vm_area_struct *vma)
833 {
834         struct soc_camera_device *icd = file->private_data;
835         struct soc_camera_host *ici = to_soc_camera_host(icd->parent);
836         int err;
837 
838         dev_dbg(icd->pdev, "mmap called, vma=0x%08lx\n", (unsigned long)vma);
839 
840         if (icd->streamer != file)
841                 return -EBUSY;
842 
843         if (mutex_lock_interruptible(&ici->host_lock))
844                 return -ERESTARTSYS;
845         if (ici->ops->init_videobuf)
846                 err = videobuf_mmap_mapper(&icd->vb_vidq, vma);
847         else
848                 err = vb2_mmap(&icd->vb2_vidq, vma);
849         mutex_unlock(&ici->host_lock);
850 
851         dev_dbg(icd->pdev, "vma start=0x%08lx, size=%ld, ret=%d\n",
852                 (unsigned long)vma->vm_start,
853                 (unsigned long)vma->vm_end - (unsigned long)vma->vm_start,
854                 err);
855 
856         return err;
857 }
858 
859 static unsigned int soc_camera_poll(struct file *file, poll_table *pt)
860 {
861         struct soc_camera_device *icd = file->private_data;
862         struct soc_camera_host *ici = to_soc_camera_host(icd->parent);
863         unsigned res = POLLERR;
864 
865         if (icd->streamer != file)
866                 return POLLERR;
867 
868         mutex_lock(&ici->host_lock);
869         if (ici->ops->init_videobuf && list_empty(&icd->vb_vidq.stream))
870                 dev_err(icd->pdev, "Trying to poll with no queued buffers!\n");
871         else
872                 res = ici->ops->poll(file, pt);
873         mutex_unlock(&ici->host_lock);
874         return res;
875 }
876 
877 static struct v4l2_file_operations soc_camera_fops = {
878         .owner          = THIS_MODULE,
879         .open           = soc_camera_open,
880         .release        = soc_camera_close,
881         .unlocked_ioctl = video_ioctl2,
882         .read           = soc_camera_read,
883         .mmap           = soc_camera_mmap,
884         .poll           = soc_camera_poll,
885 };
886 
887 static int soc_camera_s_fmt_vid_cap(struct file *file, void *priv,
888                                     struct v4l2_format *f)
889 {
890         struct soc_camera_device *icd = file->private_data;
891         int ret;
892 
893         WARN_ON(priv != file->private_data);
894 
895         if (f->type != V4L2_BUF_TYPE_VIDEO_CAPTURE) {
896                 dev_warn(icd->pdev, "Wrong buf-type %d\n", f->type);
897                 return -EINVAL;
898         }
899 
900         if (icd->streamer && icd->streamer != file)
901                 return -EBUSY;
902 
903         if (is_streaming(to_soc_camera_host(icd->parent), icd)) {
904                 dev_err(icd->pdev, "S_FMT denied: queue initialised\n");
905                 return -EBUSY;
906         }
907 
908         ret = soc_camera_set_fmt(icd, f);
909 
910         if (!ret && !icd->streamer)
911                 icd->streamer = file;
912 
913         return ret;
914 }
915 
916 static int soc_camera_enum_fmt_vid_cap(struct file *file, void  *priv,
917                                        struct v4l2_fmtdesc *f)
918 {
919         struct soc_camera_device *icd = file->private_data;
920         const struct soc_mbus_pixelfmt *format;
921 
922         WARN_ON(priv != file->private_data);
923 
924         if (f->index >= icd->num_user_formats)
925                 return -EINVAL;
926 
927         format = icd->user_formats[f->index].host_fmt;
928 
929         if (format->name)
930                 strlcpy(f->description, format->name, sizeof(f->description));
931         f->pixelformat = format->fourcc;
932         return 0;
933 }
934 
935 static int soc_camera_g_fmt_vid_cap(struct file *file, void *priv,
936                                     struct v4l2_format *f)
937 {
938         struct soc_camera_device *icd = file->private_data;
939         struct v4l2_pix_format *pix = &f->fmt.pix;
940 
941         WARN_ON(priv != file->private_data);
942 
943         if (f->type != V4L2_BUF_TYPE_VIDEO_CAPTURE)
944                 return -EINVAL;
945 
946         pix->width              = icd->user_width;
947         pix->height             = icd->user_height;
948         pix->bytesperline       = icd->bytesperline;
949         pix->sizeimage          = icd->sizeimage;
950         pix->field              = icd->field;
951         pix->pixelformat        = icd->current_fmt->host_fmt->fourcc;
952         pix->colorspace         = icd->colorspace;
953         dev_dbg(icd->pdev, "current_fmt->fourcc: 0x%08x\n",
954                 icd->current_fmt->host_fmt->fourcc);
955         return 0;
956 }
957 
958 static int soc_camera_querycap(struct file *file, void  *priv,
959                                struct v4l2_capability *cap)
960 {
961         struct soc_camera_device *icd = file->private_data;
962         struct soc_camera_host *ici = to_soc_camera_host(icd->parent);
963 
964         WARN_ON(priv != file->private_data);
965 
966         strlcpy(cap->driver, ici->drv_name, sizeof(cap->driver));
967         return ici->ops->querycap(ici, cap);
968 }
969 
970 static int soc_camera_streamon(struct file *file, void *priv,
971                                enum v4l2_buf_type i)
972 {
973         struct soc_camera_device *icd = file->private_data;
974         struct soc_camera_host *ici = to_soc_camera_host(icd->parent);
975         struct v4l2_subdev *sd = soc_camera_to_subdev(icd);
976         int ret;
977 
978         WARN_ON(priv != file->private_data);
979 
980         if (i != V4L2_BUF_TYPE_VIDEO_CAPTURE)
981                 return -EINVAL;
982 
983         if (icd->streamer != file)
984                 return -EBUSY;
985 
986         /* This calls buf_queue from host driver's videobuf_queue_ops */
987         if (ici->ops->init_videobuf)
988                 ret = videobuf_streamon(&icd->vb_vidq);
989         else
990                 ret = vb2_streamon(&icd->vb2_vidq, i);
991 
992         if (!ret)
993                 v4l2_subdev_call(sd, video, s_stream, 1);
994 
995         return ret;
996 }
997 
998 static int soc_camera_streamoff(struct file *file, void *priv,
999                                 enum v4l2_buf_type i)
1000 {
1001         struct soc_camera_device *icd = file->private_data;
1002         struct v4l2_subdev *sd = soc_camera_to_subdev(icd);
1003         struct soc_camera_host *ici = to_soc_camera_host(icd->parent);
1004         int ret;
1005 
1006         WARN_ON(priv != file->private_data);
1007 
1008         if (i != V4L2_BUF_TYPE_VIDEO_CAPTURE)
1009                 return -EINVAL;
1010 
1011         if (icd->streamer != file)
1012                 return -EBUSY;
1013 
1014         /*
1015          * This calls buf_release from host driver's videobuf_queue_ops for all
1016          * remaining buffers. When the last buffer is freed, stop capture
1017          */
1018         if (ici->ops->init_videobuf)
1019                 ret = videobuf_streamoff(&icd->vb_vidq);
1020         else
1021                 ret = vb2_streamoff(&icd->vb2_vidq, i);
1022 
1023         v4l2_subdev_call(sd, video, s_stream, 0);
1024 
1025         return ret;
1026 }
1027 
1028 static int soc_camera_g_selection(struct file *file, void *fh,
1029                                   struct v4l2_selection *s)
1030 {
1031         struct soc_camera_device *icd = file->private_data;
1032         struct soc_camera_host *ici = to_soc_camera_host(icd->parent);
1033 
1034         /* With a wrong type no need to try to fall back to cropping */
1035         if (s->type != V4L2_BUF_TYPE_VIDEO_CAPTURE)
1036                 return -EINVAL;
1037 
1038         return ici->ops->get_selection(icd, s);
1039 }
1040 
1041 static int soc_camera_s_selection(struct file *file, void *fh,
1042                                   struct v4l2_selection *s)
1043 {
1044         struct soc_camera_device *icd = file->private_data;
1045         struct soc_camera_host *ici = to_soc_camera_host(icd->parent);
1046         int ret;
1047 
1048         /* In all these cases cropping emulation will not help */
1049         if (s->type != V4L2_BUF_TYPE_VIDEO_CAPTURE ||
1050             (s->target != V4L2_SEL_TGT_COMPOSE &&
1051              s->target != V4L2_SEL_TGT_CROP))
1052                 return -EINVAL;
1053 
1054         if (s->target == V4L2_SEL_TGT_COMPOSE) {
1055                 /* No output size change during a running capture! */
1056                 if (is_streaming(ici, icd) &&
1057                     (icd->user_width != s->r.width ||
1058                      icd->user_height != s->r.height))
1059                         return -EBUSY;
1060 
1061                 /*
1062                  * Only one user is allowed to change the output format, touch
1063                  * buffers, start / stop streaming, poll for data
1064                  */
1065                 if (icd->streamer && icd->streamer != file)
1066                         return -EBUSY;
1067         }
1068 
1069         if (s->target == V4L2_SEL_TGT_CROP && is_streaming(ici, icd) &&
1070             ici->ops->set_liveselection)
1071                 ret = ici->ops->set_liveselection(icd, s);
1072         else
1073                 ret = ici->ops->set_selection(icd, s);
1074         if (!ret &&
1075             s->target == V4L2_SEL_TGT_COMPOSE) {
1076                 icd->user_width = s->r.width;
1077                 icd->user_height = s->r.height;
1078                 if (!icd->streamer)
1079                         icd->streamer = file;
1080         }
1081 
1082         return ret;
1083 }
1084 
1085 static int soc_camera_g_parm(struct file *file, void *fh,
1086                              struct v4l2_streamparm *a)
1087 {
1088         struct soc_camera_device *icd = file->private_data;
1089         struct soc_camera_host *ici = to_soc_camera_host(icd->parent);
1090 
1091         if (ici->ops->get_parm)
1092                 return ici->ops->get_parm(icd, a);
1093 
1094         return -ENOIOCTLCMD;
1095 }
1096 
1097 static int soc_camera_s_parm(struct file *file, void *fh,
1098                              struct v4l2_streamparm *a)
1099 {
1100         struct soc_camera_device *icd = file->private_data;
1101         struct soc_camera_host *ici = to_soc_camera_host(icd->parent);
1102 
1103         if (ici->ops->set_parm)
1104                 return ici->ops->set_parm(icd, a);
1105 
1106         return -ENOIOCTLCMD;
1107 }
1108 
1109 static int soc_camera_probe(struct soc_camera_host *ici,
1110                             struct soc_camera_device *icd);
1111 
1112 /* So far this function cannot fail */
1113 static void scan_add_host(struct soc_camera_host *ici)
1114 {
1115         struct soc_camera_device *icd;
1116 
1117         mutex_lock(&list_lock);
1118 
1119         list_for_each_entry(icd, &devices, list)
1120                 if (icd->iface == ici->nr) {
1121                         struct soc_camera_desc *sdesc = to_soc_camera_desc(icd);
1122                         struct soc_camera_subdev_desc *ssdd = &sdesc->subdev_desc;
1123 
1124                         /* The camera could have been already on, try to reset */
1125                         if (ssdd->reset)
1126                                 if (icd->control)
1127                                         ssdd->reset(icd->control);
1128 
1129                         icd->parent = ici->v4l2_dev.dev;
1130 
1131                         /* Ignore errors */
1132                         soc_camera_probe(ici, icd);
1133                 }
1134 
1135         mutex_unlock(&list_lock);
1136 }
1137 
1138 /*
1139  * It is invalid to call v4l2_clk_enable() after a successful probing
1140  * asynchronously outside of V4L2 operations, i.e. with .host_lock not held.
1141  */
1142 static int soc_camera_clk_enable(struct v4l2_clk *clk)
1143 {
1144         struct soc_camera_device *icd = clk->priv;
1145         struct soc_camera_host *ici;
1146 
1147         if (!icd || !icd->parent)
1148                 return -ENODEV;
1149 
1150         ici = to_soc_camera_host(icd->parent);
1151 
1152         if (!try_module_get(ici->ops->owner))
1153                 return -ENODEV;
1154 
1155         /*
1156          * If a different client is currently being probed, the host will tell
1157          * you to go
1158          */
1159         return soc_camera_clock_start(ici);
1160 }
1161 
1162 static void soc_camera_clk_disable(struct v4l2_clk *clk)
1163 {
1164         struct soc_camera_device *icd = clk->priv;
1165         struct soc_camera_host *ici;
1166 
1167         if (!icd || !icd->parent)
1168                 return;
1169 
1170         ici = to_soc_camera_host(icd->parent);
1171 
1172         soc_camera_clock_stop(ici);
1173 
1174         module_put(ici->ops->owner);
1175 }
1176 
1177 /*
1178  * Eventually, it would be more logical to make the respective host the clock
1179  * owner, but then we would have to copy this struct for each ici. Besides, it
1180  * would introduce the circular dependency problem, unless we port all client
1181  * drivers to release the clock, when not in use.
1182  */
1183 static const struct v4l2_clk_ops soc_camera_clk_ops = {
1184         .owner = THIS_MODULE,
1185         .enable = soc_camera_clk_enable,
1186         .disable = soc_camera_clk_disable,
1187 };
1188 
1189 static int soc_camera_dyn_pdev(struct soc_camera_desc *sdesc,
1190                                struct soc_camera_async_client *sasc)
1191 {
1192         struct platform_device *pdev;
1193         int ret, i;
1194 
1195         mutex_lock(&list_lock);
1196         i = find_first_zero_bit(device_map, MAP_MAX_NUM);
1197         if (i < MAP_MAX_NUM)
1198                 set_bit(i, device_map);
1199         mutex_unlock(&list_lock);
1200         if (i >= MAP_MAX_NUM)
1201                 return -ENOMEM;
1202 
1203         pdev = platform_device_alloc("soc-camera-pdrv", i);
1204         if (!pdev)
1205                 return -ENOMEM;
1206 
1207         ret = platform_device_add_data(pdev, sdesc, sizeof(*sdesc));
1208         if (ret < 0) {
1209                 platform_device_put(pdev);
1210                 return ret;
1211         }
1212 
1213         sasc->pdev = pdev;
1214 
1215         return 0;
1216 }
1217 
1218 static struct soc_camera_device *soc_camera_add_pdev(struct soc_camera_async_client *sasc)
1219 {
1220         struct platform_device *pdev = sasc->pdev;
1221         int ret;
1222 
1223         ret = platform_device_add(pdev);
1224         if (ret < 0 || !pdev->dev.driver)
1225                 return NULL;
1226 
1227         return platform_get_drvdata(pdev);
1228 }
1229 
1230 /* Locking: called with .host_lock held */
1231 static int soc_camera_probe_finish(struct soc_camera_device *icd)
1232 {
1233         struct v4l2_subdev *sd = soc_camera_to_subdev(icd);
1234         struct v4l2_subdev_format fmt = {
1235                 .which = V4L2_SUBDEV_FORMAT_ACTIVE,
1236         };
1237         struct v4l2_mbus_framefmt *mf = &fmt.format;
1238         int ret;
1239 
1240         sd->grp_id = soc_camera_grp_id(icd);
1241         v4l2_set_subdev_hostdata(sd, icd);
1242 
1243         v4l2_subdev_call(sd, video, g_tvnorms, &icd->vdev->tvnorms);
1244 
1245         ret = v4l2_ctrl_add_handler(&icd->ctrl_handler, sd->ctrl_handler, NULL);
1246         if (ret < 0)
1247                 return ret;
1248 
1249         ret = soc_camera_add_device(icd);
1250         if (ret < 0) {
1251                 dev_err(icd->pdev, "Couldn't activate the camera: %d\n", ret);
1252                 return ret;
1253         }
1254 
1255         /* At this point client .probe() should have run already */
1256         ret = soc_camera_init_user_formats(icd);
1257         if (ret < 0)
1258                 goto eusrfmt;
1259 
1260         icd->field = V4L2_FIELD_ANY;
1261 
1262         ret = soc_camera_video_start(icd);
1263         if (ret < 0)
1264                 goto evidstart;
1265 
1266         /* Try to improve our guess of a reasonable window format */
1267         if (!v4l2_subdev_call(sd, pad, get_fmt, NULL, &fmt)) {
1268                 icd->user_width         = mf->width;
1269                 icd->user_height        = mf->height;
1270                 icd->colorspace         = mf->colorspace;
1271                 icd->field              = mf->field;
1272         }
1273         soc_camera_remove_device(icd);
1274 
1275         return 0;
1276 
1277 evidstart:
1278         soc_camera_free_user_formats(icd);
1279 eusrfmt:
1280         soc_camera_remove_device(icd);
1281 
1282         return ret;
1283 }
1284 
1285 #ifdef CONFIG_I2C_BOARDINFO
1286 static int soc_camera_i2c_init(struct soc_camera_device *icd,
1287                                struct soc_camera_desc *sdesc)
1288 {
1289         struct soc_camera_subdev_desc *ssdd;
1290         struct i2c_client *client;
1291         struct soc_camera_host *ici;
1292         struct soc_camera_host_desc *shd = &sdesc->host_desc;
1293         struct i2c_adapter *adap;
1294         struct v4l2_subdev *subdev;
1295         char clk_name[V4L2_CLK_NAME_SIZE];
1296         int ret;
1297 
1298         /* First find out how we link the main client */
1299         if (icd->sasc) {
1300                 /* Async non-OF probing handled by the subdevice list */
1301                 return -EPROBE_DEFER;
1302         }
1303 
1304         ici = to_soc_camera_host(icd->parent);
1305         adap = i2c_get_adapter(shd->i2c_adapter_id);
1306         if (!adap) {
1307                 dev_err(icd->pdev, "Cannot get I2C adapter #%d. No driver?\n",
1308                         shd->i2c_adapter_id);
1309                 return -ENODEV;
1310         }
1311 
1312         ssdd = kmemdup(&sdesc->subdev_desc, sizeof(*ssdd), GFP_KERNEL);
1313         if (!ssdd) {
1314                 ret = -ENOMEM;
1315                 goto ealloc;
1316         }
1317         /*
1318          * In synchronous case we request regulators ourselves in
1319          * soc_camera_pdrv_probe(), make sure the subdevice driver doesn't try
1320          * to allocate them again.
1321          */
1322         ssdd->sd_pdata.num_regulators = 0;
1323         ssdd->sd_pdata.regulators = NULL;
1324         shd->board_info->platform_data = ssdd;
1325 
1326         v4l2_clk_name_i2c(clk_name, sizeof(clk_name),
1327                           shd->i2c_adapter_id, shd->board_info->addr);
1328 
1329         icd->clk = v4l2_clk_register(&soc_camera_clk_ops, clk_name, icd);
1330         if (IS_ERR(icd->clk)) {
1331                 ret = PTR_ERR(icd->clk);
1332                 goto eclkreg;
1333         }
1334 
1335         subdev = v4l2_i2c_new_subdev_board(&ici->v4l2_dev, adap,
1336                                 shd->board_info, NULL);
1337         if (!subdev) {
1338                 ret = -ENODEV;
1339                 goto ei2cnd;
1340         }
1341 
1342         client = v4l2_get_subdevdata(subdev);
1343 
1344         /* Use to_i2c_client(dev) to recover the i2c client */
1345         icd->control = &client->dev;
1346 
1347         return 0;
1348 ei2cnd:
1349         v4l2_clk_unregister(icd->clk);
1350         icd->clk = NULL;
1351 eclkreg:
1352         kfree(ssdd);
1353 ealloc:
1354         i2c_put_adapter(adap);
1355         return ret;
1356 }
1357 
1358 static void soc_camera_i2c_free(struct soc_camera_device *icd)
1359 {
1360         struct i2c_client *client =
1361                 to_i2c_client(to_soc_camera_control(icd));
1362         struct i2c_adapter *adap;
1363         struct soc_camera_subdev_desc *ssdd;
1364 
1365         icd->control = NULL;
1366         if (icd->sasc)
1367                 return;
1368 
1369         adap = client->adapter;
1370         ssdd = client->dev.platform_data;
1371         v4l2_device_unregister_subdev(i2c_get_clientdata(client));
1372         i2c_unregister_device(client);
1373         i2c_put_adapter(adap);
1374         kfree(ssdd);
1375         v4l2_clk_unregister(icd->clk);
1376         icd->clk = NULL;
1377 }
1378 
1379 /*
1380  * V4L2 asynchronous notifier callbacks. They are all called under a v4l2-async
1381  * internal global mutex, therefore cannot race against other asynchronous
1382  * events. Until notifier->complete() (soc_camera_async_complete()) is called,
1383  * the video device node is not registered and no V4L fops can occur. Unloading
1384  * of the host driver also calls a v4l2-async function, so also there we're
1385  * protected.
1386  */
1387 static int soc_camera_async_bound(struct v4l2_async_notifier *notifier,
1388                                   struct v4l2_subdev *sd,
1389                                   struct v4l2_async_subdev *asd)
1390 {
1391         struct soc_camera_async_client *sasc = container_of(notifier,
1392                                         struct soc_camera_async_client, notifier);
1393         struct soc_camera_device *icd = platform_get_drvdata(sasc->pdev);
1394 
1395         if (asd == sasc->sensor && !WARN_ON(icd->control)) {
1396                 struct i2c_client *client = v4l2_get_subdevdata(sd);
1397 
1398                 /*
1399                  * Only now we get subdevice-specific information like
1400                  * regulators, flags, callbacks, etc.
1401                  */
1402                 if (client) {
1403                         struct soc_camera_desc *sdesc = to_soc_camera_desc(icd);
1404                         struct soc_camera_subdev_desc *ssdd =
1405                                 soc_camera_i2c_to_desc(client);
1406                         if (ssdd) {
1407                                 memcpy(&sdesc->subdev_desc, ssdd,
1408                                        sizeof(sdesc->subdev_desc));
1409                                 if (ssdd->reset)
1410                                         ssdd->reset(&client->dev);
1411                         }
1412 
1413                         icd->control = &client->dev;
1414                 }
1415         }
1416 
1417         return 0;
1418 }
1419 
1420 static void soc_camera_async_unbind(struct v4l2_async_notifier *notifier,
1421                                     struct v4l2_subdev *sd,
1422                                     struct v4l2_async_subdev *asd)
1423 {
1424         struct soc_camera_async_client *sasc = container_of(notifier,
1425                                         struct soc_camera_async_client, notifier);
1426         struct soc_camera_device *icd = platform_get_drvdata(sasc->pdev);
1427 
1428         icd->control = NULL;
1429 
1430         if (icd->clk) {
1431                 v4l2_clk_unregister(icd->clk);
1432                 icd->clk = NULL;
1433         }
1434 }
1435 
1436 static int soc_camera_async_complete(struct v4l2_async_notifier *notifier)
1437 {
1438         struct soc_camera_async_client *sasc = container_of(notifier,
1439                                         struct soc_camera_async_client, notifier);
1440         struct soc_camera_device *icd = platform_get_drvdata(sasc->pdev);
1441 
1442         if (to_soc_camera_control(icd)) {
1443                 struct soc_camera_host *ici = to_soc_camera_host(icd->parent);
1444                 int ret;
1445 
1446                 mutex_lock(&list_lock);
1447                 ret = soc_camera_probe(ici, icd);
1448                 mutex_unlock(&list_lock);
1449                 if (ret < 0)
1450                         return ret;
1451         }
1452 
1453         return 0;
1454 }
1455 
1456 static int scan_async_group(struct soc_camera_host *ici,
1457                             struct v4l2_async_subdev **asd, unsigned int size)
1458 {
1459         struct soc_camera_async_subdev *sasd;
1460         struct soc_camera_async_client *sasc;
1461         struct soc_camera_device *icd;
1462         struct soc_camera_desc sdesc = {.host_desc.bus_id = ici->nr,};
1463         char clk_name[V4L2_CLK_NAME_SIZE];
1464         unsigned int i;
1465         int ret;
1466 
1467         /* First look for a sensor */
1468         for (i = 0; i < size; i++) {
1469                 sasd = container_of(asd[i], struct soc_camera_async_subdev, asd);
1470                 if (sasd->role == SOCAM_SUBDEV_DATA_SOURCE)
1471                         break;
1472         }
1473 
1474         if (i >= size || asd[i]->match_type != V4L2_ASYNC_MATCH_I2C) {
1475                 /* All useless */
1476                 dev_err(ici->v4l2_dev.dev, "No I2C data source found!\n");
1477                 return -ENODEV;
1478         }
1479 
1480         /* Or shall this be managed by the soc-camera device? */
1481         sasc = devm_kzalloc(ici->v4l2_dev.dev, sizeof(*sasc), GFP_KERNEL);
1482         if (!sasc)
1483                 return -ENOMEM;
1484 
1485         /* HACK: just need a != NULL */
1486         sdesc.host_desc.board_info = ERR_PTR(-ENODATA);
1487 
1488         ret = soc_camera_dyn_pdev(&sdesc, sasc);
1489         if (ret < 0)
1490                 goto eallocpdev;
1491 
1492         sasc->sensor = &sasd->asd;
1493 
1494         icd = soc_camera_add_pdev(sasc);
1495         if (!icd) {
1496                 ret = -ENOMEM;
1497                 goto eaddpdev;
1498         }
1499 
1500         sasc->notifier.subdevs = asd;
1501         sasc->notifier.num_subdevs = size;
1502         sasc->notifier.bound = soc_camera_async_bound;
1503         sasc->notifier.unbind = soc_camera_async_unbind;
1504         sasc->notifier.complete = soc_camera_async_complete;
1505 
1506         icd->sasc = sasc;
1507         icd->parent = ici->v4l2_dev.dev;
1508 
1509         v4l2_clk_name_i2c(clk_name, sizeof(clk_name),
1510                           sasd->asd.match.i2c.adapter_id,
1511                           sasd->asd.match.i2c.address);
1512 
1513         icd->clk = v4l2_clk_register(&soc_camera_clk_ops, clk_name, icd);
1514         if (IS_ERR(icd->clk)) {
1515                 ret = PTR_ERR(icd->clk);
1516                 goto eclkreg;
1517         }
1518 
1519         ret = v4l2_async_notifier_register(&ici->v4l2_dev, &sasc->notifier);
1520         if (!ret)
1521                 return 0;
1522 
1523         v4l2_clk_unregister(icd->clk);
1524 eclkreg:
1525         icd->clk = NULL;
1526         platform_device_del(sasc->pdev);
1527 eaddpdev:
1528         platform_device_put(sasc->pdev);
1529 eallocpdev:
1530         devm_kfree(ici->v4l2_dev.dev, sasc);
1531         dev_err(ici->v4l2_dev.dev, "group probe failed: %d\n", ret);
1532 
1533         return ret;
1534 }
1535 
1536 static void scan_async_host(struct soc_camera_host *ici)
1537 {
1538         struct v4l2_async_subdev **asd;
1539         int j;
1540 
1541         for (j = 0, asd = ici->asd; ici->asd_sizes[j]; j++) {
1542                 scan_async_group(ici, asd, ici->asd_sizes[j]);
1543                 asd += ici->asd_sizes[j];
1544         }
1545 }
1546 #else
1547 #define soc_camera_i2c_init(icd, sdesc) (-ENODEV)
1548 #define soc_camera_i2c_free(icd)        do {} while (0)
1549 #define scan_async_host(ici)            do {} while (0)
1550 #endif
1551 
1552 #ifdef CONFIG_OF
1553 
1554 struct soc_of_info {
1555         struct soc_camera_async_subdev  sasd;
1556         struct soc_camera_async_client  sasc;
1557         struct v4l2_async_subdev        *subdev;
1558 };
1559 
1560 static int soc_of_bind(struct soc_camera_host *ici,
1561                        struct device_node *ep,
1562                        struct device_node *remote)
1563 {
1564         struct soc_camera_device *icd;
1565         struct soc_camera_desc sdesc = {.host_desc.bus_id = ici->nr,};
1566         struct soc_camera_async_client *sasc;
1567         struct soc_of_info *info;
1568         struct i2c_client *client;
1569         char clk_name[V4L2_CLK_NAME_SIZE];
1570         int ret;
1571 
1572         /* allocate a new subdev and add match info to it */
1573         info = devm_kzalloc(ici->v4l2_dev.dev, sizeof(struct soc_of_info),
1574                             GFP_KERNEL);
1575         if (!info)
1576                 return -ENOMEM;
1577 
1578         info->sasd.asd.match.of.node = remote;
1579         info->sasd.asd.match_type = V4L2_ASYNC_MATCH_OF;
1580         info->subdev = &info->sasd.asd;
1581 
1582         /* Or shall this be managed by the soc-camera device? */
1583         sasc = &info->sasc;
1584 
1585         /* HACK: just need a != NULL */
1586         sdesc.host_desc.board_info = ERR_PTR(-ENODATA);
1587 
1588         ret = soc_camera_dyn_pdev(&sdesc, sasc);
1589         if (ret < 0)
1590                 goto eallocpdev;
1591 
1592         sasc->sensor = &info->sasd.asd;
1593 
1594         icd = soc_camera_add_pdev(sasc);
1595         if (!icd) {
1596                 ret = -ENOMEM;
1597                 goto eaddpdev;
1598         }
1599 
1600         sasc->notifier.subdevs = &info->subdev;
1601         sasc->notifier.num_subdevs = 1;
1602         sasc->notifier.bound = soc_camera_async_bound;
1603         sasc->notifier.unbind = soc_camera_async_unbind;
1604         sasc->notifier.complete = soc_camera_async_complete;
1605 
1606         icd->sasc = sasc;
1607         icd->parent = ici->v4l2_dev.dev;
1608 
1609         client = of_find_i2c_device_by_node(remote);
1610 
1611         if (client)
1612                 v4l2_clk_name_i2c(clk_name, sizeof(clk_name),
1613                                   client->adapter->nr, client->addr);
1614         else
1615                 v4l2_clk_name_of(clk_name, sizeof(clk_name),
1616                                  of_node_full_name(remote));
1617 
1618         icd->clk = v4l2_clk_register(&soc_camera_clk_ops, clk_name, icd);
1619         if (IS_ERR(icd->clk)) {
1620                 ret = PTR_ERR(icd->clk);
1621                 goto eclkreg;
1622         }
1623 
1624         ret = v4l2_async_notifier_register(&ici->v4l2_dev, &sasc->notifier);
1625         if (!ret)
1626                 return 0;
1627 
1628         v4l2_clk_unregister(icd->clk);
1629 eclkreg:
1630         icd->clk = NULL;
1631         platform_device_del(sasc->pdev);
1632 eaddpdev:
1633         platform_device_put(sasc->pdev);
1634 eallocpdev:
1635         devm_kfree(ici->v4l2_dev.dev, info);
1636         dev_err(ici->v4l2_dev.dev, "group probe failed: %d\n", ret);
1637 
1638         return ret;
1639 }
1640 
1641 static void scan_of_host(struct soc_camera_host *ici)
1642 {
1643         struct device *dev = ici->v4l2_dev.dev;
1644         struct device_node *np = dev->of_node;
1645         struct device_node *epn = NULL, *ren;
1646         unsigned int i;
1647 
1648         for (i = 0; ; i++) {
1649                 epn = of_graph_get_next_endpoint(np, epn);
1650                 if (!epn)
1651                         break;
1652 
1653                 ren = of_graph_get_remote_port(epn);
1654                 if (!ren) {
1655                         dev_notice(dev, "no remote for %s\n",
1656                                    of_node_full_name(epn));
1657                         continue;
1658                 }
1659 
1660                 /* so we now have a remote node to connect */
1661                 if (!i)
1662                         soc_of_bind(ici, epn, ren->parent);
1663 
1664                 of_node_put(ren);
1665 
1666                 if (i) {
1667                         dev_err(dev, "multiple subdevices aren't supported yet!\n");
1668                         break;
1669                 }
1670         }
1671 
1672         of_node_put(epn);
1673 }
1674 
1675 #else
1676 static inline void scan_of_host(struct soc_camera_host *ici) { }
1677 #endif
1678 
1679 /* Called during host-driver probe */
1680 static int soc_camera_probe(struct soc_camera_host *ici,
1681                             struct soc_camera_device *icd)
1682 {
1683         struct soc_camera_desc *sdesc = to_soc_camera_desc(icd);
1684         struct soc_camera_host_desc *shd = &sdesc->host_desc;
1685         struct device *control = NULL;
1686         int ret;
1687 
1688         dev_info(icd->pdev, "Probing %s\n", dev_name(icd->pdev));
1689 
1690         /*
1691          * Currently the subdev with the largest number of controls (13) is
1692          * ov6550. So let's pick 16 as a hint for the control handler. Note
1693          * that this is a hint only: too large and you waste some memory, too
1694          * small and there is a (very) small performance hit when looking up
1695          * controls in the internal hash.
1696          */
1697         ret = v4l2_ctrl_handler_init(&icd->ctrl_handler, 16);
1698         if (ret < 0)
1699                 return ret;
1700 
1701         /* Must have icd->vdev before registering the device */
1702         ret = video_dev_create(icd);
1703         if (ret < 0)
1704                 goto evdc;
1705 
1706         /*
1707          * ..._video_start() will create a device node, video_register_device()
1708          * itself is protected against concurrent open() calls, but we also have
1709          * to protect our data also during client probing.
1710          */
1711 
1712         /* Non-i2c cameras, e.g., soc_camera_platform, have no board_info */
1713         if (shd->board_info) {
1714                 ret = soc_camera_i2c_init(icd, sdesc);
1715                 if (ret < 0 && ret != -EPROBE_DEFER)
1716                         goto eadd;
1717         } else if (!shd->add_device || !shd->del_device) {
1718                 ret = -EINVAL;
1719                 goto eadd;
1720         } else {
1721                 ret = soc_camera_clock_start(ici);
1722                 if (ret < 0)
1723                         goto eadd;
1724 
1725                 if (shd->module_name)
1726                         ret = request_module(shd->module_name);
1727 
1728                 ret = shd->add_device(icd);
1729                 if (ret < 0)
1730                         goto eadddev;
1731 
1732                 /*
1733                  * FIXME: this is racy, have to use driver-binding notification,
1734                  * when it is available
1735                  */
1736                 control = to_soc_camera_control(icd);
1737                 if (!control || !control->driver || !dev_get_drvdata(control) ||
1738                     !try_module_get(control->driver->owner)) {
1739                         shd->del_device(icd);
1740                         ret = -ENODEV;
1741                         goto enodrv;
1742                 }
1743         }
1744 
1745         mutex_lock(&ici->host_lock);
1746         ret = soc_camera_probe_finish(icd);
1747         mutex_unlock(&ici->host_lock);
1748         if (ret < 0)
1749                 goto efinish;
1750 
1751         return 0;
1752 
1753 efinish:
1754         if (shd->board_info) {
1755                 soc_camera_i2c_free(icd);
1756         } else {
1757                 shd->del_device(icd);
1758                 module_put(control->driver->owner);
1759 enodrv:
1760 eadddev:
1761                 soc_camera_clock_stop(ici);
1762         }
1763 eadd:
1764         if (icd->vdev) {
1765                 video_device_release(icd->vdev);
1766                 icd->vdev = NULL;
1767         }
1768 evdc:
1769         v4l2_ctrl_handler_free(&icd->ctrl_handler);
1770         return ret;
1771 }
1772 
1773 /*
1774  * This is called on device_unregister, which only means we have to disconnect
1775  * from the host, but not remove ourselves from the device list. With
1776  * asynchronous client probing this can also be called without
1777  * soc_camera_probe_finish() having run. Careful with clean up.
1778  */
1779 static int soc_camera_remove(struct soc_camera_device *icd)
1780 {
1781         struct soc_camera_desc *sdesc = to_soc_camera_desc(icd);
1782         struct video_device *vdev = icd->vdev;
1783 
1784         v4l2_ctrl_handler_free(&icd->ctrl_handler);
1785         if (vdev) {
1786                 video_unregister_device(vdev);
1787                 icd->vdev = NULL;
1788         }
1789 
1790         if (sdesc->host_desc.board_info) {
1791                 soc_camera_i2c_free(icd);
1792         } else {
1793                 struct device *dev = to_soc_camera_control(icd);
1794                 struct device_driver *drv = dev ? dev->driver : NULL;
1795                 if (drv) {
1796                         sdesc->host_desc.del_device(icd);
1797                         module_put(drv->owner);
1798                 }
1799         }
1800 
1801         if (icd->num_user_formats)
1802                 soc_camera_free_user_formats(icd);
1803 
1804         if (icd->clk) {
1805                 /* For the synchronous case */
1806                 v4l2_clk_unregister(icd->clk);
1807                 icd->clk = NULL;
1808         }
1809 
1810         if (icd->sasc)
1811                 platform_device_unregister(icd->sasc->pdev);
1812 
1813         return 0;
1814 }
1815 
1816 static int default_g_selection(struct soc_camera_device *icd,
1817                                struct v4l2_selection *sel)
1818 {
1819         struct v4l2_subdev *sd = soc_camera_to_subdev(icd);
1820         struct v4l2_subdev_selection sdsel = {
1821                 .which = V4L2_SUBDEV_FORMAT_ACTIVE,
1822                 .target = sel->target,
1823         };
1824         int ret;
1825 
1826         ret = v4l2_subdev_call(sd, pad, get_selection, NULL, &sdsel);
1827         if (ret)
1828                 return ret;
1829         sel->r = sdsel.r;
1830         return 0;
1831 }
1832 
1833 static int default_s_selection(struct soc_camera_device *icd,
1834                                struct v4l2_selection *sel)
1835 {
1836         struct v4l2_subdev *sd = soc_camera_to_subdev(icd);
1837         struct v4l2_subdev_selection sdsel = {
1838                 .which = V4L2_SUBDEV_FORMAT_ACTIVE,
1839                 .target = sel->target,
1840                 .flags = sel->flags,
1841                 .r = sel->r,
1842         };
1843         int ret;
1844 
1845         ret = v4l2_subdev_call(sd, pad, set_selection, NULL, &sdsel);
1846         if (ret)
1847                 return ret;
1848         sel->r = sdsel.r;
1849         return 0;
1850 }
1851 
1852 static int default_g_parm(struct soc_camera_device *icd,
1853                           struct v4l2_streamparm *parm)
1854 {
1855         struct v4l2_subdev *sd = soc_camera_to_subdev(icd);
1856         return v4l2_subdev_call(sd, video, g_parm, parm);
1857 }
1858 
1859 static int default_s_parm(struct soc_camera_device *icd,
1860                           struct v4l2_streamparm *parm)
1861 {
1862         struct v4l2_subdev *sd = soc_camera_to_subdev(icd);
1863         return v4l2_subdev_call(sd, video, s_parm, parm);
1864 }
1865 
1866 static int default_enum_framesizes(struct soc_camera_device *icd,
1867                                    struct v4l2_frmsizeenum *fsize)
1868 {
1869         int ret;
1870         struct v4l2_subdev *sd = soc_camera_to_subdev(icd);
1871         const struct soc_camera_format_xlate *xlate;
1872         struct v4l2_subdev_frame_size_enum fse = {
1873                 .index = fsize->index,
1874                 .which = V4L2_SUBDEV_FORMAT_ACTIVE,
1875         };
1876 
1877         xlate = soc_camera_xlate_by_fourcc(icd, fsize->pixel_format);
1878         if (!xlate)
1879                 return -EINVAL;
1880         fse.code = xlate->code;
1881 
1882         ret = v4l2_subdev_call(sd, pad, enum_frame_size, NULL, &fse);
1883         if (ret < 0)
1884                 return ret;
1885 
1886         if (fse.min_width == fse.max_width &&
1887             fse.min_height == fse.max_height) {
1888                 fsize->type = V4L2_FRMSIZE_TYPE_DISCRETE;
1889                 fsize->discrete.width = fse.min_width;
1890                 fsize->discrete.height = fse.min_height;
1891                 return 0;
1892         }
1893         fsize->type = V4L2_FRMSIZE_TYPE_CONTINUOUS;
1894         fsize->stepwise.min_width = fse.min_width;
1895         fsize->stepwise.max_width = fse.max_width;
1896         fsize->stepwise.min_height = fse.min_height;
1897         fsize->stepwise.max_height = fse.max_height;
1898         fsize->stepwise.step_width = 1;
1899         fsize->stepwise.step_height = 1;
1900         return 0;
1901 }
1902 
1903 int soc_camera_host_register(struct soc_camera_host *ici)
1904 {
1905         struct soc_camera_host *ix;
1906         int ret;
1907 
1908         if (!ici || !ici->ops ||
1909             !ici->ops->try_fmt ||
1910             !ici->ops->set_fmt ||
1911             !ici->ops->set_bus_param ||
1912             !ici->ops->querycap ||
1913             ((!ici->ops->init_videobuf ||
1914               !ici->ops->reqbufs) &&
1915              !ici->ops->init_videobuf2) ||
1916             !ici->ops->poll ||
1917             !ici->v4l2_dev.dev)
1918                 return -EINVAL;
1919 
1920         if (!ici->ops->set_selection)
1921                 ici->ops->set_selection = default_s_selection;
1922         if (!ici->ops->get_selection)
1923                 ici->ops->get_selection = default_g_selection;
1924         if (!ici->ops->set_parm)
1925                 ici->ops->set_parm = default_s_parm;
1926         if (!ici->ops->get_parm)
1927                 ici->ops->get_parm = default_g_parm;
1928         if (!ici->ops->enum_framesizes)
1929                 ici->ops->enum_framesizes = default_enum_framesizes;
1930 
1931         mutex_lock(&list_lock);
1932         list_for_each_entry(ix, &hosts, list) {
1933                 if (ix->nr == ici->nr) {
1934                         ret = -EBUSY;
1935                         goto edevreg;
1936                 }
1937         }
1938 
1939         ret = v4l2_device_register(ici->v4l2_dev.dev, &ici->v4l2_dev);
1940         if (ret < 0)
1941                 goto edevreg;
1942 
1943         list_add_tail(&ici->list, &hosts);
1944         mutex_unlock(&list_lock);
1945 
1946         mutex_init(&ici->host_lock);
1947         mutex_init(&ici->clk_lock);
1948 
1949         if (ici->v4l2_dev.dev->of_node)
1950                 scan_of_host(ici);
1951         else if (ici->asd_sizes)
1952                 /*
1953                  * No OF, host with a list of subdevices. Don't try to mix
1954                  * modes by initialising some groups statically and some
1955                  * dynamically!
1956                  */
1957                 scan_async_host(ici);
1958         else
1959                 /* Legacy: static platform devices from board data */
1960                 scan_add_host(ici);
1961 
1962         return 0;
1963 
1964 edevreg:
1965         mutex_unlock(&list_lock);
1966         return ret;
1967 }
1968 EXPORT_SYMBOL(soc_camera_host_register);
1969 
1970 /* Unregister all clients! */
1971 void soc_camera_host_unregister(struct soc_camera_host *ici)
1972 {
1973         struct soc_camera_device *icd, *tmp;
1974         struct soc_camera_async_client *sasc;
1975         LIST_HEAD(notifiers);
1976 
1977         mutex_lock(&list_lock);
1978         list_del(&ici->list);
1979         list_for_each_entry(icd, &devices, list)
1980                 if (icd->iface == ici->nr && icd->sasc) {
1981                         /* as long as we hold the device, sasc won't be freed */
1982                         get_device(icd->pdev);
1983                         list_add(&icd->sasc->list, &notifiers);
1984                 }
1985         mutex_unlock(&list_lock);
1986 
1987         list_for_each_entry(sasc, &notifiers, list) {
1988                 /* Must call unlocked to avoid AB-BA dead-lock */
1989                 v4l2_async_notifier_unregister(&sasc->notifier);
1990                 put_device(&sasc->pdev->dev);
1991         }
1992 
1993         mutex_lock(&list_lock);
1994 
1995         list_for_each_entry_safe(icd, tmp, &devices, list)
1996                 if (icd->iface == ici->nr)
1997                         soc_camera_remove(icd);
1998 
1999         mutex_unlock(&list_lock);
2000 
2001         v4l2_device_unregister(&ici->v4l2_dev);
2002 }
2003 EXPORT_SYMBOL(soc_camera_host_unregister);
2004 
2005 /* Image capture device */
2006 static int soc_camera_device_register(struct soc_camera_device *icd)
2007 {
2008         struct soc_camera_device *ix;
2009         int num = -1, i;
2010 
2011         mutex_lock(&list_lock);
2012         for (i = 0; i < 256 && num < 0; i++) {
2013                 num = i;
2014                 /* Check if this index is available on this interface */
2015                 list_for_each_entry(ix, &devices, list) {
2016                         if (ix->iface == icd->iface && ix->devnum == i) {
2017                                 num = -1;
2018                                 break;
2019                         }
2020                 }
2021         }
2022 
2023         if (num < 0) {
2024                 /*
2025                  * ok, we have 256 cameras on this host...
2026                  * man, stay reasonable...
2027                  */
2028                 mutex_unlock(&list_lock);
2029                 return -ENOMEM;
2030         }
2031 
2032         icd->devnum             = num;
2033         icd->use_count          = 0;
2034         icd->host_priv          = NULL;
2035 
2036         /*
2037          * Dynamically allocated devices set the bit earlier, but it doesn't hurt setting
2038          * it again
2039          */
2040         i = to_platform_device(icd->pdev)->id;
2041         if (i < 0)
2042                 /* One static (legacy) soc-camera platform device */
2043                 i = 0;
2044         if (i >= MAP_MAX_NUM) {
2045                 mutex_unlock(&list_lock);
2046                 return -EBUSY;
2047         }
2048         set_bit(i, device_map);
2049         list_add_tail(&icd->list, &devices);
2050         mutex_unlock(&list_lock);
2051 
2052         return 0;
2053 }
2054 
2055 static const struct v4l2_ioctl_ops soc_camera_ioctl_ops = {
2056         .vidioc_querycap         = soc_camera_querycap,
2057         .vidioc_try_fmt_vid_cap  = soc_camera_try_fmt_vid_cap,
2058         .vidioc_g_fmt_vid_cap    = soc_camera_g_fmt_vid_cap,
2059         .vidioc_s_fmt_vid_cap    = soc_camera_s_fmt_vid_cap,
2060         .vidioc_enum_fmt_vid_cap = soc_camera_enum_fmt_vid_cap,
2061         .vidioc_enum_input       = soc_camera_enum_input,
2062         .vidioc_g_input          = soc_camera_g_input,
2063         .vidioc_s_input          = soc_camera_s_input,
2064         .vidioc_s_std            = soc_camera_s_std,
2065         .vidioc_g_std            = soc_camera_g_std,
2066         .vidioc_enum_framesizes  = soc_camera_enum_framesizes,
2067         .vidioc_reqbufs          = soc_camera_reqbufs,
2068         .vidioc_querybuf         = soc_camera_querybuf,
2069         .vidioc_qbuf             = soc_camera_qbuf,
2070         .vidioc_dqbuf            = soc_camera_dqbuf,
2071         .vidioc_create_bufs      = soc_camera_create_bufs,
2072         .vidioc_prepare_buf      = soc_camera_prepare_buf,
2073         .vidioc_expbuf           = soc_camera_expbuf,
2074         .vidioc_streamon         = soc_camera_streamon,
2075         .vidioc_streamoff        = soc_camera_streamoff,
2076         .vidioc_g_selection      = soc_camera_g_selection,
2077         .vidioc_s_selection      = soc_camera_s_selection,
2078         .vidioc_g_parm           = soc_camera_g_parm,
2079         .vidioc_s_parm           = soc_camera_s_parm,
2080 };
2081 
2082 static int video_dev_create(struct soc_camera_device *icd)
2083 {
2084         struct soc_camera_host *ici = to_soc_camera_host(icd->parent);
2085         struct video_device *vdev = video_device_alloc();
2086 
2087         if (!vdev)
2088                 return -ENOMEM;
2089 
2090         strlcpy(vdev->name, ici->drv_name, sizeof(vdev->name));
2091 
2092         vdev->v4l2_dev          = &ici->v4l2_dev;
2093         vdev->fops              = &soc_camera_fops;
2094         vdev->ioctl_ops         = &soc_camera_ioctl_ops;
2095         vdev->release           = video_device_release;
2096         vdev->ctrl_handler      = &icd->ctrl_handler;
2097         vdev->lock              = &ici->host_lock;
2098 
2099         icd->vdev = vdev;
2100 
2101         return 0;
2102 }
2103 
2104 /*
2105  * Called from soc_camera_probe() above with .host_lock held
2106  */
2107 static int soc_camera_video_start(struct soc_camera_device *icd)
2108 {
2109         const struct device_type *type = icd->vdev->dev.type;
2110         int ret;
2111 
2112         if (!icd->parent)
2113                 return -ENODEV;
2114 
2115         video_set_drvdata(icd->vdev, icd);
2116         if (icd->vdev->tvnorms == 0) {
2117                 /* disable the STD API if there are no tvnorms defined */
2118                 v4l2_disable_ioctl(icd->vdev, VIDIOC_G_STD);
2119                 v4l2_disable_ioctl(icd->vdev, VIDIOC_S_STD);
2120                 v4l2_disable_ioctl(icd->vdev, VIDIOC_ENUMSTD);
2121         }
2122         ret = video_register_device(icd->vdev, VFL_TYPE_GRABBER, -1);
2123         if (ret < 0) {
2124                 dev_err(icd->pdev, "video_register_device failed: %d\n", ret);
2125                 return ret;
2126         }
2127 
2128         /* Restore device type, possibly set by the subdevice driver */
2129         icd->vdev->dev.type = type;
2130 
2131         return 0;
2132 }
2133 
2134 static int soc_camera_pdrv_probe(struct platform_device *pdev)
2135 {
2136         struct soc_camera_desc *sdesc = pdev->dev.platform_data;
2137         struct soc_camera_subdev_desc *ssdd = &sdesc->subdev_desc;
2138         struct soc_camera_device *icd;
2139         int ret;
2140 
2141         if (!sdesc)
2142                 return -EINVAL;
2143 
2144         icd = devm_kzalloc(&pdev->dev, sizeof(*icd), GFP_KERNEL);
2145         if (!icd)
2146                 return -ENOMEM;
2147 
2148         /*
2149          * In the asynchronous case ssdd->num_regulators == 0 yet, so, the below
2150          * regulator allocation is a dummy. They are actually requested by the
2151          * subdevice driver, using soc_camera_power_init(). Also note, that in
2152          * that case regulators are attached to the I2C device and not to the
2153          * camera platform device.
2154          */
2155         ret = devm_regulator_bulk_get(&pdev->dev, ssdd->sd_pdata.num_regulators,
2156                                       ssdd->sd_pdata.regulators);
2157         if (ret < 0)
2158                 return ret;
2159 
2160         icd->iface = sdesc->host_desc.bus_id;
2161         icd->sdesc = sdesc;
2162         icd->pdev = &pdev->dev;
2163         platform_set_drvdata(pdev, icd);
2164 
2165         icd->user_width         = DEFAULT_WIDTH;
2166         icd->user_height        = DEFAULT_HEIGHT;
2167 
2168         return soc_camera_device_register(icd);
2169 }
2170 
2171 /*
2172  * Only called on rmmod for each platform device, since they are not
2173  * hot-pluggable. Now we know, that all our users - hosts and devices have
2174  * been unloaded already
2175  */
2176 static int soc_camera_pdrv_remove(struct platform_device *pdev)
2177 {
2178         struct soc_camera_device *icd = platform_get_drvdata(pdev);
2179         int i;
2180 
2181         if (!icd)
2182                 return -EINVAL;
2183 
2184         i = pdev->id;
2185         if (i < 0)
2186                 i = 0;
2187 
2188         /*
2189          * In synchronous mode with static platform devices this is called in a
2190          * loop from drivers/base/dd.c::driver_detach(), no parallel execution,
2191          * no need to lock. In asynchronous case the caller -
2192          * soc_camera_host_unregister() - already holds the lock
2193          */
2194         if (test_bit(i, device_map)) {
2195                 clear_bit(i, device_map);
2196                 list_del(&icd->list);
2197         }
2198 
2199         return 0;
2200 }
2201 
2202 static struct platform_driver __refdata soc_camera_pdrv = {
2203         .probe = soc_camera_pdrv_probe,
2204         .remove  = soc_camera_pdrv_remove,
2205         .driver  = {
2206                 .name   = "soc-camera-pdrv",
2207         },
2208 };
2209 
2210 module_platform_driver(soc_camera_pdrv);
2211 
2212 MODULE_DESCRIPTION("Image capture bus driver");
2213 MODULE_AUTHOR("Guennadi Liakhovetski <kernel@pengutronix.de>");
2214 MODULE_LICENSE("GPL");
2215 MODULE_ALIAS("platform:soc-camera-pdrv");
2216 

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