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[deliverable/linux.git] / drivers / media / platform / soc_camera / soc_camera.c
1 /*
2 * camera image capture (abstract) bus driver
3 *
4 * Copyright (C) 2008, Guennadi Liakhovetski <kernel@pengutronix.de>
5 *
6 * This driver provides an interface between platform-specific camera
7 * busses and camera devices. It should be used if the camera is
8 * connected not over a "proper" bus like PCI or USB, but over a
9 * special bus, like, for example, the Quick Capture interface on PXA270
10 * SoCs. Later it should also be used for i.MX31 SoCs from Freescale.
11 * It can handle multiple cameras and / or multiple busses, which can
12 * be used, e.g., in stereo-vision applications.
13 *
14 * This program is free software; you can redistribute it and/or modify
15 * it under the terms of the GNU General Public License version 2 as
16 * published by the Free Software Foundation.
17 */
18
19 #include <linux/device.h>
20 #include <linux/err.h>
21 #include <linux/i2c.h>
22 #include <linux/init.h>
23 #include <linux/list.h>
24 #include <linux/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_crop() */
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_cropcap(struct file *file, void *fh,
1029 struct v4l2_cropcap *a)
1030 {
1031 struct soc_camera_device *icd = file->private_data;
1032 struct soc_camera_host *ici = to_soc_camera_host(icd->parent);
1033
1034 return ici->ops->cropcap(icd, a);
1035 }
1036
1037 static int soc_camera_g_crop(struct file *file, void *fh,
1038 struct v4l2_crop *a)
1039 {
1040 struct soc_camera_device *icd = file->private_data;
1041 struct soc_camera_host *ici = to_soc_camera_host(icd->parent);
1042 int ret;
1043
1044 ret = ici->ops->get_crop(icd, a);
1045
1046 return ret;
1047 }
1048
1049 /*
1050 * According to the V4L2 API, drivers shall not update the struct v4l2_crop
1051 * argument with the actual geometry, instead, the user shall use G_CROP to
1052 * retrieve it.
1053 */
1054 static int soc_camera_s_crop(struct file *file, void *fh,
1055 const struct v4l2_crop *a)
1056 {
1057 struct soc_camera_device *icd = file->private_data;
1058 struct soc_camera_host *ici = to_soc_camera_host(icd->parent);
1059 const struct v4l2_rect *rect = &a->c;
1060 struct v4l2_crop current_crop;
1061 int ret;
1062
1063 if (a->type != V4L2_BUF_TYPE_VIDEO_CAPTURE)
1064 return -EINVAL;
1065
1066 dev_dbg(icd->pdev, "S_CROP(%ux%u@%u:%u)\n",
1067 rect->width, rect->height, rect->left, rect->top);
1068
1069 current_crop.type = a->type;
1070
1071 /* If get_crop fails, we'll let host and / or client drivers decide */
1072 ret = ici->ops->get_crop(icd, &current_crop);
1073
1074 /* Prohibit window size change with initialised buffers */
1075 if (ret < 0) {
1076 dev_err(icd->pdev,
1077 "S_CROP denied: getting current crop failed\n");
1078 } else if ((a->c.width == current_crop.c.width &&
1079 a->c.height == current_crop.c.height) ||
1080 !is_streaming(ici, icd)) {
1081 /* same size or not streaming - use .set_crop() */
1082 ret = ici->ops->set_crop(icd, a);
1083 } else if (ici->ops->set_livecrop) {
1084 ret = ici->ops->set_livecrop(icd, a);
1085 } else {
1086 dev_err(icd->pdev,
1087 "S_CROP denied: queue initialised and sizes differ\n");
1088 ret = -EBUSY;
1089 }
1090
1091 return ret;
1092 }
1093
1094 static int soc_camera_g_selection(struct file *file, void *fh,
1095 struct v4l2_selection *s)
1096 {
1097 struct soc_camera_device *icd = file->private_data;
1098 struct soc_camera_host *ici = to_soc_camera_host(icd->parent);
1099
1100 /* With a wrong type no need to try to fall back to cropping */
1101 if (s->type != V4L2_BUF_TYPE_VIDEO_CAPTURE)
1102 return -EINVAL;
1103
1104 if (!ici->ops->get_selection)
1105 return -ENOTTY;
1106
1107 return ici->ops->get_selection(icd, s);
1108 }
1109
1110 static int soc_camera_s_selection(struct file *file, void *fh,
1111 struct v4l2_selection *s)
1112 {
1113 struct soc_camera_device *icd = file->private_data;
1114 struct soc_camera_host *ici = to_soc_camera_host(icd->parent);
1115 int ret;
1116
1117 /* In all these cases cropping emulation will not help */
1118 if (s->type != V4L2_BUF_TYPE_VIDEO_CAPTURE ||
1119 (s->target != V4L2_SEL_TGT_COMPOSE &&
1120 s->target != V4L2_SEL_TGT_CROP))
1121 return -EINVAL;
1122
1123 if (s->target == V4L2_SEL_TGT_COMPOSE) {
1124 /* No output size change during a running capture! */
1125 if (is_streaming(ici, icd) &&
1126 (icd->user_width != s->r.width ||
1127 icd->user_height != s->r.height))
1128 return -EBUSY;
1129
1130 /*
1131 * Only one user is allowed to change the output format, touch
1132 * buffers, start / stop streaming, poll for data
1133 */
1134 if (icd->streamer && icd->streamer != file)
1135 return -EBUSY;
1136 }
1137
1138 if (!ici->ops->set_selection)
1139 return -ENOTTY;
1140
1141 ret = ici->ops->set_selection(icd, s);
1142 if (!ret &&
1143 s->target == V4L2_SEL_TGT_COMPOSE) {
1144 icd->user_width = s->r.width;
1145 icd->user_height = s->r.height;
1146 if (!icd->streamer)
1147 icd->streamer = file;
1148 }
1149
1150 return ret;
1151 }
1152
1153 static int soc_camera_g_parm(struct file *file, void *fh,
1154 struct v4l2_streamparm *a)
1155 {
1156 struct soc_camera_device *icd = file->private_data;
1157 struct soc_camera_host *ici = to_soc_camera_host(icd->parent);
1158
1159 if (ici->ops->get_parm)
1160 return ici->ops->get_parm(icd, a);
1161
1162 return -ENOIOCTLCMD;
1163 }
1164
1165 static int soc_camera_s_parm(struct file *file, void *fh,
1166 struct v4l2_streamparm *a)
1167 {
1168 struct soc_camera_device *icd = file->private_data;
1169 struct soc_camera_host *ici = to_soc_camera_host(icd->parent);
1170
1171 if (ici->ops->set_parm)
1172 return ici->ops->set_parm(icd, a);
1173
1174 return -ENOIOCTLCMD;
1175 }
1176
1177 static int soc_camera_probe(struct soc_camera_host *ici,
1178 struct soc_camera_device *icd);
1179
1180 /* So far this function cannot fail */
1181 static void scan_add_host(struct soc_camera_host *ici)
1182 {
1183 struct soc_camera_device *icd;
1184
1185 mutex_lock(&list_lock);
1186
1187 list_for_each_entry(icd, &devices, list)
1188 if (icd->iface == ici->nr) {
1189 struct soc_camera_desc *sdesc = to_soc_camera_desc(icd);
1190 struct soc_camera_subdev_desc *ssdd = &sdesc->subdev_desc;
1191
1192 /* The camera could have been already on, try to reset */
1193 if (ssdd->reset)
1194 if (icd->control)
1195 ssdd->reset(icd->control);
1196
1197 icd->parent = ici->v4l2_dev.dev;
1198
1199 /* Ignore errors */
1200 soc_camera_probe(ici, icd);
1201 }
1202
1203 mutex_unlock(&list_lock);
1204 }
1205
1206 /*
1207 * It is invalid to call v4l2_clk_enable() after a successful probing
1208 * asynchronously outside of V4L2 operations, i.e. with .host_lock not held.
1209 */
1210 static int soc_camera_clk_enable(struct v4l2_clk *clk)
1211 {
1212 struct soc_camera_device *icd = clk->priv;
1213 struct soc_camera_host *ici;
1214
1215 if (!icd || !icd->parent)
1216 return -ENODEV;
1217
1218 ici = to_soc_camera_host(icd->parent);
1219
1220 if (!try_module_get(ici->ops->owner))
1221 return -ENODEV;
1222
1223 /*
1224 * If a different client is currently being probed, the host will tell
1225 * you to go
1226 */
1227 return soc_camera_clock_start(ici);
1228 }
1229
1230 static void soc_camera_clk_disable(struct v4l2_clk *clk)
1231 {
1232 struct soc_camera_device *icd = clk->priv;
1233 struct soc_camera_host *ici;
1234
1235 if (!icd || !icd->parent)
1236 return;
1237
1238 ici = to_soc_camera_host(icd->parent);
1239
1240 soc_camera_clock_stop(ici);
1241
1242 module_put(ici->ops->owner);
1243 }
1244
1245 /*
1246 * Eventually, it would be more logical to make the respective host the clock
1247 * owner, but then we would have to copy this struct for each ici. Besides, it
1248 * would introduce the circular dependency problem, unless we port all client
1249 * drivers to release the clock, when not in use.
1250 */
1251 static const struct v4l2_clk_ops soc_camera_clk_ops = {
1252 .owner = THIS_MODULE,
1253 .enable = soc_camera_clk_enable,
1254 .disable = soc_camera_clk_disable,
1255 };
1256
1257 static int soc_camera_dyn_pdev(struct soc_camera_desc *sdesc,
1258 struct soc_camera_async_client *sasc)
1259 {
1260 struct platform_device *pdev;
1261 int ret, i;
1262
1263 mutex_lock(&list_lock);
1264 i = find_first_zero_bit(device_map, MAP_MAX_NUM);
1265 if (i < MAP_MAX_NUM)
1266 set_bit(i, device_map);
1267 mutex_unlock(&list_lock);
1268 if (i >= MAP_MAX_NUM)
1269 return -ENOMEM;
1270
1271 pdev = platform_device_alloc("soc-camera-pdrv", i);
1272 if (!pdev)
1273 return -ENOMEM;
1274
1275 ret = platform_device_add_data(pdev, sdesc, sizeof(*sdesc));
1276 if (ret < 0) {
1277 platform_device_put(pdev);
1278 return ret;
1279 }
1280
1281 sasc->pdev = pdev;
1282
1283 return 0;
1284 }
1285
1286 static struct soc_camera_device *soc_camera_add_pdev(struct soc_camera_async_client *sasc)
1287 {
1288 struct platform_device *pdev = sasc->pdev;
1289 int ret;
1290
1291 ret = platform_device_add(pdev);
1292 if (ret < 0 || !pdev->dev.driver)
1293 return NULL;
1294
1295 return platform_get_drvdata(pdev);
1296 }
1297
1298 /* Locking: called with .host_lock held */
1299 static int soc_camera_probe_finish(struct soc_camera_device *icd)
1300 {
1301 struct v4l2_subdev *sd = soc_camera_to_subdev(icd);
1302 struct v4l2_subdev_format fmt = {
1303 .which = V4L2_SUBDEV_FORMAT_ACTIVE,
1304 };
1305 struct v4l2_mbus_framefmt *mf = &fmt.format;
1306 int ret;
1307
1308 sd->grp_id = soc_camera_grp_id(icd);
1309 v4l2_set_subdev_hostdata(sd, icd);
1310
1311 v4l2_subdev_call(sd, video, g_tvnorms, &icd->vdev->tvnorms);
1312
1313 ret = v4l2_ctrl_add_handler(&icd->ctrl_handler, sd->ctrl_handler, NULL);
1314 if (ret < 0)
1315 return ret;
1316
1317 ret = soc_camera_add_device(icd);
1318 if (ret < 0) {
1319 dev_err(icd->pdev, "Couldn't activate the camera: %d\n", ret);
1320 return ret;
1321 }
1322
1323 /* At this point client .probe() should have run already */
1324 ret = soc_camera_init_user_formats(icd);
1325 if (ret < 0)
1326 goto eusrfmt;
1327
1328 icd->field = V4L2_FIELD_ANY;
1329
1330 ret = soc_camera_video_start(icd);
1331 if (ret < 0)
1332 goto evidstart;
1333
1334 /* Try to improve our guess of a reasonable window format */
1335 if (!v4l2_subdev_call(sd, pad, get_fmt, NULL, &fmt)) {
1336 icd->user_width = mf->width;
1337 icd->user_height = mf->height;
1338 icd->colorspace = mf->colorspace;
1339 icd->field = mf->field;
1340 }
1341 soc_camera_remove_device(icd);
1342
1343 return 0;
1344
1345 evidstart:
1346 soc_camera_free_user_formats(icd);
1347 eusrfmt:
1348 soc_camera_remove_device(icd);
1349
1350 return ret;
1351 }
1352
1353 #ifdef CONFIG_I2C_BOARDINFO
1354 static int soc_camera_i2c_init(struct soc_camera_device *icd,
1355 struct soc_camera_desc *sdesc)
1356 {
1357 struct soc_camera_subdev_desc *ssdd;
1358 struct i2c_client *client;
1359 struct soc_camera_host *ici;
1360 struct soc_camera_host_desc *shd = &sdesc->host_desc;
1361 struct i2c_adapter *adap;
1362 struct v4l2_subdev *subdev;
1363 char clk_name[V4L2_CLK_NAME_SIZE];
1364 int ret;
1365
1366 /* First find out how we link the main client */
1367 if (icd->sasc) {
1368 /* Async non-OF probing handled by the subdevice list */
1369 return -EPROBE_DEFER;
1370 }
1371
1372 ici = to_soc_camera_host(icd->parent);
1373 adap = i2c_get_adapter(shd->i2c_adapter_id);
1374 if (!adap) {
1375 dev_err(icd->pdev, "Cannot get I2C adapter #%d. No driver?\n",
1376 shd->i2c_adapter_id);
1377 return -ENODEV;
1378 }
1379
1380 ssdd = kmemdup(&sdesc->subdev_desc, sizeof(*ssdd), GFP_KERNEL);
1381 if (!ssdd) {
1382 ret = -ENOMEM;
1383 goto ealloc;
1384 }
1385 /*
1386 * In synchronous case we request regulators ourselves in
1387 * soc_camera_pdrv_probe(), make sure the subdevice driver doesn't try
1388 * to allocate them again.
1389 */
1390 ssdd->sd_pdata.num_regulators = 0;
1391 ssdd->sd_pdata.regulators = NULL;
1392 shd->board_info->platform_data = ssdd;
1393
1394 v4l2_clk_name_i2c(clk_name, sizeof(clk_name),
1395 shd->i2c_adapter_id, shd->board_info->addr);
1396
1397 icd->clk = v4l2_clk_register(&soc_camera_clk_ops, clk_name, icd);
1398 if (IS_ERR(icd->clk)) {
1399 ret = PTR_ERR(icd->clk);
1400 goto eclkreg;
1401 }
1402
1403 subdev = v4l2_i2c_new_subdev_board(&ici->v4l2_dev, adap,
1404 shd->board_info, NULL);
1405 if (!subdev) {
1406 ret = -ENODEV;
1407 goto ei2cnd;
1408 }
1409
1410 client = v4l2_get_subdevdata(subdev);
1411
1412 /* Use to_i2c_client(dev) to recover the i2c client */
1413 icd->control = &client->dev;
1414
1415 return 0;
1416 ei2cnd:
1417 v4l2_clk_unregister(icd->clk);
1418 icd->clk = NULL;
1419 eclkreg:
1420 kfree(ssdd);
1421 ealloc:
1422 i2c_put_adapter(adap);
1423 return ret;
1424 }
1425
1426 static void soc_camera_i2c_free(struct soc_camera_device *icd)
1427 {
1428 struct i2c_client *client =
1429 to_i2c_client(to_soc_camera_control(icd));
1430 struct i2c_adapter *adap;
1431 struct soc_camera_subdev_desc *ssdd;
1432
1433 icd->control = NULL;
1434 if (icd->sasc)
1435 return;
1436
1437 adap = client->adapter;
1438 ssdd = client->dev.platform_data;
1439 v4l2_device_unregister_subdev(i2c_get_clientdata(client));
1440 i2c_unregister_device(client);
1441 i2c_put_adapter(adap);
1442 kfree(ssdd);
1443 v4l2_clk_unregister(icd->clk);
1444 icd->clk = NULL;
1445 }
1446
1447 /*
1448 * V4L2 asynchronous notifier callbacks. They are all called under a v4l2-async
1449 * internal global mutex, therefore cannot race against other asynchronous
1450 * events. Until notifier->complete() (soc_camera_async_complete()) is called,
1451 * the video device node is not registered and no V4L fops can occur. Unloading
1452 * of the host driver also calls a v4l2-async function, so also there we're
1453 * protected.
1454 */
1455 static int soc_camera_async_bound(struct v4l2_async_notifier *notifier,
1456 struct v4l2_subdev *sd,
1457 struct v4l2_async_subdev *asd)
1458 {
1459 struct soc_camera_async_client *sasc = container_of(notifier,
1460 struct soc_camera_async_client, notifier);
1461 struct soc_camera_device *icd = platform_get_drvdata(sasc->pdev);
1462
1463 if (asd == sasc->sensor && !WARN_ON(icd->control)) {
1464 struct i2c_client *client = v4l2_get_subdevdata(sd);
1465
1466 /*
1467 * Only now we get subdevice-specific information like
1468 * regulators, flags, callbacks, etc.
1469 */
1470 if (client) {
1471 struct soc_camera_desc *sdesc = to_soc_camera_desc(icd);
1472 struct soc_camera_subdev_desc *ssdd =
1473 soc_camera_i2c_to_desc(client);
1474 if (ssdd) {
1475 memcpy(&sdesc->subdev_desc, ssdd,
1476 sizeof(sdesc->subdev_desc));
1477 if (ssdd->reset)
1478 ssdd->reset(&client->dev);
1479 }
1480
1481 icd->control = &client->dev;
1482 }
1483 }
1484
1485 return 0;
1486 }
1487
1488 static void soc_camera_async_unbind(struct v4l2_async_notifier *notifier,
1489 struct v4l2_subdev *sd,
1490 struct v4l2_async_subdev *asd)
1491 {
1492 struct soc_camera_async_client *sasc = container_of(notifier,
1493 struct soc_camera_async_client, notifier);
1494 struct soc_camera_device *icd = platform_get_drvdata(sasc->pdev);
1495
1496 icd->control = NULL;
1497
1498 if (icd->clk) {
1499 v4l2_clk_unregister(icd->clk);
1500 icd->clk = NULL;
1501 }
1502 }
1503
1504 static int soc_camera_async_complete(struct v4l2_async_notifier *notifier)
1505 {
1506 struct soc_camera_async_client *sasc = container_of(notifier,
1507 struct soc_camera_async_client, notifier);
1508 struct soc_camera_device *icd = platform_get_drvdata(sasc->pdev);
1509
1510 if (to_soc_camera_control(icd)) {
1511 struct soc_camera_host *ici = to_soc_camera_host(icd->parent);
1512 int ret;
1513
1514 mutex_lock(&list_lock);
1515 ret = soc_camera_probe(ici, icd);
1516 mutex_unlock(&list_lock);
1517 if (ret < 0)
1518 return ret;
1519 }
1520
1521 return 0;
1522 }
1523
1524 static int scan_async_group(struct soc_camera_host *ici,
1525 struct v4l2_async_subdev **asd, unsigned int size)
1526 {
1527 struct soc_camera_async_subdev *sasd;
1528 struct soc_camera_async_client *sasc;
1529 struct soc_camera_device *icd;
1530 struct soc_camera_desc sdesc = {.host_desc.bus_id = ici->nr,};
1531 char clk_name[V4L2_CLK_NAME_SIZE];
1532 unsigned int i;
1533 int ret;
1534
1535 /* First look for a sensor */
1536 for (i = 0; i < size; i++) {
1537 sasd = container_of(asd[i], struct soc_camera_async_subdev, asd);
1538 if (sasd->role == SOCAM_SUBDEV_DATA_SOURCE)
1539 break;
1540 }
1541
1542 if (i >= size || asd[i]->match_type != V4L2_ASYNC_MATCH_I2C) {
1543 /* All useless */
1544 dev_err(ici->v4l2_dev.dev, "No I2C data source found!\n");
1545 return -ENODEV;
1546 }
1547
1548 /* Or shall this be managed by the soc-camera device? */
1549 sasc = devm_kzalloc(ici->v4l2_dev.dev, sizeof(*sasc), GFP_KERNEL);
1550 if (!sasc)
1551 return -ENOMEM;
1552
1553 /* HACK: just need a != NULL */
1554 sdesc.host_desc.board_info = ERR_PTR(-ENODATA);
1555
1556 ret = soc_camera_dyn_pdev(&sdesc, sasc);
1557 if (ret < 0)
1558 goto eallocpdev;
1559
1560 sasc->sensor = &sasd->asd;
1561
1562 icd = soc_camera_add_pdev(sasc);
1563 if (!icd) {
1564 ret = -ENOMEM;
1565 goto eaddpdev;
1566 }
1567
1568 sasc->notifier.subdevs = asd;
1569 sasc->notifier.num_subdevs = size;
1570 sasc->notifier.bound = soc_camera_async_bound;
1571 sasc->notifier.unbind = soc_camera_async_unbind;
1572 sasc->notifier.complete = soc_camera_async_complete;
1573
1574 icd->sasc = sasc;
1575 icd->parent = ici->v4l2_dev.dev;
1576
1577 v4l2_clk_name_i2c(clk_name, sizeof(clk_name),
1578 sasd->asd.match.i2c.adapter_id,
1579 sasd->asd.match.i2c.address);
1580
1581 icd->clk = v4l2_clk_register(&soc_camera_clk_ops, clk_name, icd);
1582 if (IS_ERR(icd->clk)) {
1583 ret = PTR_ERR(icd->clk);
1584 goto eclkreg;
1585 }
1586
1587 ret = v4l2_async_notifier_register(&ici->v4l2_dev, &sasc->notifier);
1588 if (!ret)
1589 return 0;
1590
1591 v4l2_clk_unregister(icd->clk);
1592 eclkreg:
1593 icd->clk = NULL;
1594 platform_device_del(sasc->pdev);
1595 eaddpdev:
1596 platform_device_put(sasc->pdev);
1597 eallocpdev:
1598 devm_kfree(ici->v4l2_dev.dev, sasc);
1599 dev_err(ici->v4l2_dev.dev, "group probe failed: %d\n", ret);
1600
1601 return ret;
1602 }
1603
1604 static void scan_async_host(struct soc_camera_host *ici)
1605 {
1606 struct v4l2_async_subdev **asd;
1607 int j;
1608
1609 for (j = 0, asd = ici->asd; ici->asd_sizes[j]; j++) {
1610 scan_async_group(ici, asd, ici->asd_sizes[j]);
1611 asd += ici->asd_sizes[j];
1612 }
1613 }
1614 #else
1615 #define soc_camera_i2c_init(icd, sdesc) (-ENODEV)
1616 #define soc_camera_i2c_free(icd) do {} while (0)
1617 #define scan_async_host(ici) do {} while (0)
1618 #endif
1619
1620 #ifdef CONFIG_OF
1621
1622 struct soc_of_info {
1623 struct soc_camera_async_subdev sasd;
1624 struct soc_camera_async_client sasc;
1625 struct v4l2_async_subdev *subdev;
1626 };
1627
1628 static int soc_of_bind(struct soc_camera_host *ici,
1629 struct device_node *ep,
1630 struct device_node *remote)
1631 {
1632 struct soc_camera_device *icd;
1633 struct soc_camera_desc sdesc = {.host_desc.bus_id = ici->nr,};
1634 struct soc_camera_async_client *sasc;
1635 struct soc_of_info *info;
1636 struct i2c_client *client;
1637 char clk_name[V4L2_CLK_NAME_SIZE];
1638 int ret;
1639
1640 /* allocate a new subdev and add match info to it */
1641 info = devm_kzalloc(ici->v4l2_dev.dev, sizeof(struct soc_of_info),
1642 GFP_KERNEL);
1643 if (!info)
1644 return -ENOMEM;
1645
1646 info->sasd.asd.match.of.node = remote;
1647 info->sasd.asd.match_type = V4L2_ASYNC_MATCH_OF;
1648 info->subdev = &info->sasd.asd;
1649
1650 /* Or shall this be managed by the soc-camera device? */
1651 sasc = &info->sasc;
1652
1653 /* HACK: just need a != NULL */
1654 sdesc.host_desc.board_info = ERR_PTR(-ENODATA);
1655
1656 ret = soc_camera_dyn_pdev(&sdesc, sasc);
1657 if (ret < 0)
1658 goto eallocpdev;
1659
1660 sasc->sensor = &info->sasd.asd;
1661
1662 icd = soc_camera_add_pdev(sasc);
1663 if (!icd) {
1664 ret = -ENOMEM;
1665 goto eaddpdev;
1666 }
1667
1668 sasc->notifier.subdevs = &info->subdev;
1669 sasc->notifier.num_subdevs = 1;
1670 sasc->notifier.bound = soc_camera_async_bound;
1671 sasc->notifier.unbind = soc_camera_async_unbind;
1672 sasc->notifier.complete = soc_camera_async_complete;
1673
1674 icd->sasc = sasc;
1675 icd->parent = ici->v4l2_dev.dev;
1676
1677 client = of_find_i2c_device_by_node(remote);
1678
1679 if (client)
1680 v4l2_clk_name_i2c(clk_name, sizeof(clk_name),
1681 client->adapter->nr, client->addr);
1682 else
1683 v4l2_clk_name_of(clk_name, sizeof(clk_name),
1684 of_node_full_name(remote));
1685
1686 icd->clk = v4l2_clk_register(&soc_camera_clk_ops, clk_name, icd);
1687 if (IS_ERR(icd->clk)) {
1688 ret = PTR_ERR(icd->clk);
1689 goto eclkreg;
1690 }
1691
1692 ret = v4l2_async_notifier_register(&ici->v4l2_dev, &sasc->notifier);
1693 if (!ret)
1694 return 0;
1695
1696 v4l2_clk_unregister(icd->clk);
1697 eclkreg:
1698 icd->clk = NULL;
1699 platform_device_del(sasc->pdev);
1700 eaddpdev:
1701 platform_device_put(sasc->pdev);
1702 eallocpdev:
1703 devm_kfree(ici->v4l2_dev.dev, info);
1704 dev_err(ici->v4l2_dev.dev, "group probe failed: %d\n", ret);
1705
1706 return ret;
1707 }
1708
1709 static void scan_of_host(struct soc_camera_host *ici)
1710 {
1711 struct device *dev = ici->v4l2_dev.dev;
1712 struct device_node *np = dev->of_node;
1713 struct device_node *epn = NULL, *ren;
1714 unsigned int i;
1715
1716 for (i = 0; ; i++) {
1717 epn = of_graph_get_next_endpoint(np, epn);
1718 if (!epn)
1719 break;
1720
1721 ren = of_graph_get_remote_port(epn);
1722 if (!ren) {
1723 dev_notice(dev, "no remote for %s\n",
1724 of_node_full_name(epn));
1725 continue;
1726 }
1727
1728 /* so we now have a remote node to connect */
1729 if (!i)
1730 soc_of_bind(ici, epn, ren->parent);
1731
1732 of_node_put(ren);
1733
1734 if (i) {
1735 dev_err(dev, "multiple subdevices aren't supported yet!\n");
1736 break;
1737 }
1738 }
1739
1740 of_node_put(epn);
1741 }
1742
1743 #else
1744 static inline void scan_of_host(struct soc_camera_host *ici) { }
1745 #endif
1746
1747 /* Called during host-driver probe */
1748 static int soc_camera_probe(struct soc_camera_host *ici,
1749 struct soc_camera_device *icd)
1750 {
1751 struct soc_camera_desc *sdesc = to_soc_camera_desc(icd);
1752 struct soc_camera_host_desc *shd = &sdesc->host_desc;
1753 struct device *control = NULL;
1754 int ret;
1755
1756 dev_info(icd->pdev, "Probing %s\n", dev_name(icd->pdev));
1757
1758 /*
1759 * Currently the subdev with the largest number of controls (13) is
1760 * ov6550. So let's pick 16 as a hint for the control handler. Note
1761 * that this is a hint only: too large and you waste some memory, too
1762 * small and there is a (very) small performance hit when looking up
1763 * controls in the internal hash.
1764 */
1765 ret = v4l2_ctrl_handler_init(&icd->ctrl_handler, 16);
1766 if (ret < 0)
1767 return ret;
1768
1769 /* Must have icd->vdev before registering the device */
1770 ret = video_dev_create(icd);
1771 if (ret < 0)
1772 goto evdc;
1773
1774 /*
1775 * ..._video_start() will create a device node, video_register_device()
1776 * itself is protected against concurrent open() calls, but we also have
1777 * to protect our data also during client probing.
1778 */
1779
1780 /* Non-i2c cameras, e.g., soc_camera_platform, have no board_info */
1781 if (shd->board_info) {
1782 ret = soc_camera_i2c_init(icd, sdesc);
1783 if (ret < 0 && ret != -EPROBE_DEFER)
1784 goto eadd;
1785 } else if (!shd->add_device || !shd->del_device) {
1786 ret = -EINVAL;
1787 goto eadd;
1788 } else {
1789 ret = soc_camera_clock_start(ici);
1790 if (ret < 0)
1791 goto eadd;
1792
1793 if (shd->module_name)
1794 ret = request_module(shd->module_name);
1795
1796 ret = shd->add_device(icd);
1797 if (ret < 0)
1798 goto eadddev;
1799
1800 /*
1801 * FIXME: this is racy, have to use driver-binding notification,
1802 * when it is available
1803 */
1804 control = to_soc_camera_control(icd);
1805 if (!control || !control->driver || !dev_get_drvdata(control) ||
1806 !try_module_get(control->driver->owner)) {
1807 shd->del_device(icd);
1808 ret = -ENODEV;
1809 goto enodrv;
1810 }
1811 }
1812
1813 mutex_lock(&ici->host_lock);
1814 ret = soc_camera_probe_finish(icd);
1815 mutex_unlock(&ici->host_lock);
1816 if (ret < 0)
1817 goto efinish;
1818
1819 return 0;
1820
1821 efinish:
1822 if (shd->board_info) {
1823 soc_camera_i2c_free(icd);
1824 } else {
1825 shd->del_device(icd);
1826 module_put(control->driver->owner);
1827 enodrv:
1828 eadddev:
1829 soc_camera_clock_stop(ici);
1830 }
1831 eadd:
1832 if (icd->vdev) {
1833 video_device_release(icd->vdev);
1834 icd->vdev = NULL;
1835 }
1836 evdc:
1837 v4l2_ctrl_handler_free(&icd->ctrl_handler);
1838 return ret;
1839 }
1840
1841 /*
1842 * This is called on device_unregister, which only means we have to disconnect
1843 * from the host, but not remove ourselves from the device list. With
1844 * asynchronous client probing this can also be called without
1845 * soc_camera_probe_finish() having run. Careful with clean up.
1846 */
1847 static int soc_camera_remove(struct soc_camera_device *icd)
1848 {
1849 struct soc_camera_desc *sdesc = to_soc_camera_desc(icd);
1850 struct video_device *vdev = icd->vdev;
1851
1852 v4l2_ctrl_handler_free(&icd->ctrl_handler);
1853 if (vdev) {
1854 video_unregister_device(vdev);
1855 icd->vdev = NULL;
1856 }
1857
1858 if (sdesc->host_desc.board_info) {
1859 soc_camera_i2c_free(icd);
1860 } else {
1861 struct device *dev = to_soc_camera_control(icd);
1862 struct device_driver *drv = dev ? dev->driver : NULL;
1863 if (drv) {
1864 sdesc->host_desc.del_device(icd);
1865 module_put(drv->owner);
1866 }
1867 }
1868
1869 if (icd->num_user_formats)
1870 soc_camera_free_user_formats(icd);
1871
1872 if (icd->clk) {
1873 /* For the synchronous case */
1874 v4l2_clk_unregister(icd->clk);
1875 icd->clk = NULL;
1876 }
1877
1878 if (icd->sasc)
1879 platform_device_unregister(icd->sasc->pdev);
1880
1881 return 0;
1882 }
1883
1884 static int default_cropcap(struct soc_camera_device *icd,
1885 struct v4l2_cropcap *a)
1886 {
1887 struct v4l2_subdev *sd = soc_camera_to_subdev(icd);
1888 return v4l2_subdev_call(sd, video, cropcap, a);
1889 }
1890
1891 static int default_g_crop(struct soc_camera_device *icd, struct v4l2_crop *a)
1892 {
1893 struct v4l2_subdev *sd = soc_camera_to_subdev(icd);
1894 return v4l2_subdev_call(sd, video, g_crop, a);
1895 }
1896
1897 static int default_s_crop(struct soc_camera_device *icd, const struct v4l2_crop *a)
1898 {
1899 struct v4l2_subdev *sd = soc_camera_to_subdev(icd);
1900 return v4l2_subdev_call(sd, video, s_crop, a);
1901 }
1902
1903 static int default_g_parm(struct soc_camera_device *icd,
1904 struct v4l2_streamparm *parm)
1905 {
1906 struct v4l2_subdev *sd = soc_camera_to_subdev(icd);
1907 return v4l2_subdev_call(sd, video, g_parm, parm);
1908 }
1909
1910 static int default_s_parm(struct soc_camera_device *icd,
1911 struct v4l2_streamparm *parm)
1912 {
1913 struct v4l2_subdev *sd = soc_camera_to_subdev(icd);
1914 return v4l2_subdev_call(sd, video, s_parm, parm);
1915 }
1916
1917 static int default_enum_framesizes(struct soc_camera_device *icd,
1918 struct v4l2_frmsizeenum *fsize)
1919 {
1920 int ret;
1921 struct v4l2_subdev *sd = soc_camera_to_subdev(icd);
1922 const struct soc_camera_format_xlate *xlate;
1923 struct v4l2_subdev_frame_size_enum fse = {
1924 .index = fsize->index,
1925 .which = V4L2_SUBDEV_FORMAT_ACTIVE,
1926 };
1927
1928 xlate = soc_camera_xlate_by_fourcc(icd, fsize->pixel_format);
1929 if (!xlate)
1930 return -EINVAL;
1931 fse.code = xlate->code;
1932
1933 ret = v4l2_subdev_call(sd, pad, enum_frame_size, NULL, &fse);
1934 if (ret < 0)
1935 return ret;
1936
1937 if (fse.min_width == fse.max_width &&
1938 fse.min_height == fse.max_height) {
1939 fsize->type = V4L2_FRMSIZE_TYPE_DISCRETE;
1940 fsize->discrete.width = fse.min_width;
1941 fsize->discrete.height = fse.min_height;
1942 return 0;
1943 }
1944 fsize->type = V4L2_FRMSIZE_TYPE_CONTINUOUS;
1945 fsize->stepwise.min_width = fse.min_width;
1946 fsize->stepwise.max_width = fse.max_width;
1947 fsize->stepwise.min_height = fse.min_height;
1948 fsize->stepwise.max_height = fse.max_height;
1949 fsize->stepwise.step_width = 1;
1950 fsize->stepwise.step_height = 1;
1951 return 0;
1952 }
1953
1954 int soc_camera_host_register(struct soc_camera_host *ici)
1955 {
1956 struct soc_camera_host *ix;
1957 int ret;
1958
1959 if (!ici || !ici->ops ||
1960 !ici->ops->try_fmt ||
1961 !ici->ops->set_fmt ||
1962 !ici->ops->set_bus_param ||
1963 !ici->ops->querycap ||
1964 ((!ici->ops->init_videobuf ||
1965 !ici->ops->reqbufs) &&
1966 !ici->ops->init_videobuf2) ||
1967 !ici->ops->poll ||
1968 !ici->v4l2_dev.dev)
1969 return -EINVAL;
1970
1971 if (!ici->ops->set_crop)
1972 ici->ops->set_crop = default_s_crop;
1973 if (!ici->ops->get_crop)
1974 ici->ops->get_crop = default_g_crop;
1975 if (!ici->ops->cropcap)
1976 ici->ops->cropcap = default_cropcap;
1977 if (!ici->ops->set_parm)
1978 ici->ops->set_parm = default_s_parm;
1979 if (!ici->ops->get_parm)
1980 ici->ops->get_parm = default_g_parm;
1981 if (!ici->ops->enum_framesizes)
1982 ici->ops->enum_framesizes = default_enum_framesizes;
1983
1984 mutex_lock(&list_lock);
1985 list_for_each_entry(ix, &hosts, list) {
1986 if (ix->nr == ici->nr) {
1987 ret = -EBUSY;
1988 goto edevreg;
1989 }
1990 }
1991
1992 ret = v4l2_device_register(ici->v4l2_dev.dev, &ici->v4l2_dev);
1993 if (ret < 0)
1994 goto edevreg;
1995
1996 list_add_tail(&ici->list, &hosts);
1997 mutex_unlock(&list_lock);
1998
1999 mutex_init(&ici->host_lock);
2000 mutex_init(&ici->clk_lock);
2001
2002 if (ici->v4l2_dev.dev->of_node)
2003 scan_of_host(ici);
2004 else if (ici->asd_sizes)
2005 /*
2006 * No OF, host with a list of subdevices. Don't try to mix
2007 * modes by initialising some groups statically and some
2008 * dynamically!
2009 */
2010 scan_async_host(ici);
2011 else
2012 /* Legacy: static platform devices from board data */
2013 scan_add_host(ici);
2014
2015 return 0;
2016
2017 edevreg:
2018 mutex_unlock(&list_lock);
2019 return ret;
2020 }
2021 EXPORT_SYMBOL(soc_camera_host_register);
2022
2023 /* Unregister all clients! */
2024 void soc_camera_host_unregister(struct soc_camera_host *ici)
2025 {
2026 struct soc_camera_device *icd, *tmp;
2027 struct soc_camera_async_client *sasc;
2028 LIST_HEAD(notifiers);
2029
2030 mutex_lock(&list_lock);
2031 list_del(&ici->list);
2032 list_for_each_entry(icd, &devices, list)
2033 if (icd->iface == ici->nr && icd->sasc) {
2034 /* as long as we hold the device, sasc won't be freed */
2035 get_device(icd->pdev);
2036 list_add(&icd->sasc->list, &notifiers);
2037 }
2038 mutex_unlock(&list_lock);
2039
2040 list_for_each_entry(sasc, &notifiers, list) {
2041 /* Must call unlocked to avoid AB-BA dead-lock */
2042 v4l2_async_notifier_unregister(&sasc->notifier);
2043 put_device(&sasc->pdev->dev);
2044 }
2045
2046 mutex_lock(&list_lock);
2047
2048 list_for_each_entry_safe(icd, tmp, &devices, list)
2049 if (icd->iface == ici->nr)
2050 soc_camera_remove(icd);
2051
2052 mutex_unlock(&list_lock);
2053
2054 v4l2_device_unregister(&ici->v4l2_dev);
2055 }
2056 EXPORT_SYMBOL(soc_camera_host_unregister);
2057
2058 /* Image capture device */
2059 static int soc_camera_device_register(struct soc_camera_device *icd)
2060 {
2061 struct soc_camera_device *ix;
2062 int num = -1, i;
2063
2064 mutex_lock(&list_lock);
2065 for (i = 0; i < 256 && num < 0; i++) {
2066 num = i;
2067 /* Check if this index is available on this interface */
2068 list_for_each_entry(ix, &devices, list) {
2069 if (ix->iface == icd->iface && ix->devnum == i) {
2070 num = -1;
2071 break;
2072 }
2073 }
2074 }
2075
2076 if (num < 0) {
2077 /*
2078 * ok, we have 256 cameras on this host...
2079 * man, stay reasonable...
2080 */
2081 mutex_unlock(&list_lock);
2082 return -ENOMEM;
2083 }
2084
2085 icd->devnum = num;
2086 icd->use_count = 0;
2087 icd->host_priv = NULL;
2088
2089 /*
2090 * Dynamically allocated devices set the bit earlier, but it doesn't hurt setting
2091 * it again
2092 */
2093 i = to_platform_device(icd->pdev)->id;
2094 if (i < 0)
2095 /* One static (legacy) soc-camera platform device */
2096 i = 0;
2097 if (i >= MAP_MAX_NUM) {
2098 mutex_unlock(&list_lock);
2099 return -EBUSY;
2100 }
2101 set_bit(i, device_map);
2102 list_add_tail(&icd->list, &devices);
2103 mutex_unlock(&list_lock);
2104
2105 return 0;
2106 }
2107
2108 static const struct v4l2_ioctl_ops soc_camera_ioctl_ops = {
2109 .vidioc_querycap = soc_camera_querycap,
2110 .vidioc_try_fmt_vid_cap = soc_camera_try_fmt_vid_cap,
2111 .vidioc_g_fmt_vid_cap = soc_camera_g_fmt_vid_cap,
2112 .vidioc_s_fmt_vid_cap = soc_camera_s_fmt_vid_cap,
2113 .vidioc_enum_fmt_vid_cap = soc_camera_enum_fmt_vid_cap,
2114 .vidioc_enum_input = soc_camera_enum_input,
2115 .vidioc_g_input = soc_camera_g_input,
2116 .vidioc_s_input = soc_camera_s_input,
2117 .vidioc_s_std = soc_camera_s_std,
2118 .vidioc_g_std = soc_camera_g_std,
2119 .vidioc_enum_framesizes = soc_camera_enum_framesizes,
2120 .vidioc_reqbufs = soc_camera_reqbufs,
2121 .vidioc_querybuf = soc_camera_querybuf,
2122 .vidioc_qbuf = soc_camera_qbuf,
2123 .vidioc_dqbuf = soc_camera_dqbuf,
2124 .vidioc_create_bufs = soc_camera_create_bufs,
2125 .vidioc_prepare_buf = soc_camera_prepare_buf,
2126 .vidioc_expbuf = soc_camera_expbuf,
2127 .vidioc_streamon = soc_camera_streamon,
2128 .vidioc_streamoff = soc_camera_streamoff,
2129 .vidioc_cropcap = soc_camera_cropcap,
2130 .vidioc_g_crop = soc_camera_g_crop,
2131 .vidioc_s_crop = soc_camera_s_crop,
2132 .vidioc_g_selection = soc_camera_g_selection,
2133 .vidioc_s_selection = soc_camera_s_selection,
2134 .vidioc_g_parm = soc_camera_g_parm,
2135 .vidioc_s_parm = soc_camera_s_parm,
2136 };
2137
2138 static int video_dev_create(struct soc_camera_device *icd)
2139 {
2140 struct soc_camera_host *ici = to_soc_camera_host(icd->parent);
2141 struct video_device *vdev = video_device_alloc();
2142
2143 if (!vdev)
2144 return -ENOMEM;
2145
2146 strlcpy(vdev->name, ici->drv_name, sizeof(vdev->name));
2147
2148 vdev->v4l2_dev = &ici->v4l2_dev;
2149 vdev->fops = &soc_camera_fops;
2150 vdev->ioctl_ops = &soc_camera_ioctl_ops;
2151 vdev->release = video_device_release;
2152 vdev->ctrl_handler = &icd->ctrl_handler;
2153 vdev->lock = &ici->host_lock;
2154
2155 icd->vdev = vdev;
2156
2157 return 0;
2158 }
2159
2160 /*
2161 * Called from soc_camera_probe() above with .host_lock held
2162 */
2163 static int soc_camera_video_start(struct soc_camera_device *icd)
2164 {
2165 const struct device_type *type = icd->vdev->dev.type;
2166 int ret;
2167
2168 if (!icd->parent)
2169 return -ENODEV;
2170
2171 video_set_drvdata(icd->vdev, icd);
2172 if (icd->vdev->tvnorms == 0) {
2173 /* disable the STD API if there are no tvnorms defined */
2174 v4l2_disable_ioctl(icd->vdev, VIDIOC_G_STD);
2175 v4l2_disable_ioctl(icd->vdev, VIDIOC_S_STD);
2176 v4l2_disable_ioctl(icd->vdev, VIDIOC_ENUMSTD);
2177 }
2178 ret = video_register_device(icd->vdev, VFL_TYPE_GRABBER, -1);
2179 if (ret < 0) {
2180 dev_err(icd->pdev, "video_register_device failed: %d\n", ret);
2181 return ret;
2182 }
2183
2184 /* Restore device type, possibly set by the subdevice driver */
2185 icd->vdev->dev.type = type;
2186
2187 return 0;
2188 }
2189
2190 static int soc_camera_pdrv_probe(struct platform_device *pdev)
2191 {
2192 struct soc_camera_desc *sdesc = pdev->dev.platform_data;
2193 struct soc_camera_subdev_desc *ssdd = &sdesc->subdev_desc;
2194 struct soc_camera_device *icd;
2195 int ret;
2196
2197 if (!sdesc)
2198 return -EINVAL;
2199
2200 icd = devm_kzalloc(&pdev->dev, sizeof(*icd), GFP_KERNEL);
2201 if (!icd)
2202 return -ENOMEM;
2203
2204 /*
2205 * In the asynchronous case ssdd->num_regulators == 0 yet, so, the below
2206 * regulator allocation is a dummy. They are actually requested by the
2207 * subdevice driver, using soc_camera_power_init(). Also note, that in
2208 * that case regulators are attached to the I2C device and not to the
2209 * camera platform device.
2210 */
2211 ret = devm_regulator_bulk_get(&pdev->dev, ssdd->sd_pdata.num_regulators,
2212 ssdd->sd_pdata.regulators);
2213 if (ret < 0)
2214 return ret;
2215
2216 icd->iface = sdesc->host_desc.bus_id;
2217 icd->sdesc = sdesc;
2218 icd->pdev = &pdev->dev;
2219 platform_set_drvdata(pdev, icd);
2220
2221 icd->user_width = DEFAULT_WIDTH;
2222 icd->user_height = DEFAULT_HEIGHT;
2223
2224 return soc_camera_device_register(icd);
2225 }
2226
2227 /*
2228 * Only called on rmmod for each platform device, since they are not
2229 * hot-pluggable. Now we know, that all our users - hosts and devices have
2230 * been unloaded already
2231 */
2232 static int soc_camera_pdrv_remove(struct platform_device *pdev)
2233 {
2234 struct soc_camera_device *icd = platform_get_drvdata(pdev);
2235 int i;
2236
2237 if (!icd)
2238 return -EINVAL;
2239
2240 i = pdev->id;
2241 if (i < 0)
2242 i = 0;
2243
2244 /*
2245 * In synchronous mode with static platform devices this is called in a
2246 * loop from drivers/base/dd.c::driver_detach(), no parallel execution,
2247 * no need to lock. In asynchronous case the caller -
2248 * soc_camera_host_unregister() - already holds the lock
2249 */
2250 if (test_bit(i, device_map)) {
2251 clear_bit(i, device_map);
2252 list_del(&icd->list);
2253 }
2254
2255 return 0;
2256 }
2257
2258 static struct platform_driver __refdata soc_camera_pdrv = {
2259 .probe = soc_camera_pdrv_probe,
2260 .remove = soc_camera_pdrv_remove,
2261 .driver = {
2262 .name = "soc-camera-pdrv",
2263 },
2264 };
2265
2266 module_platform_driver(soc_camera_pdrv);
2267
2268 MODULE_DESCRIPTION("Image capture bus driver");
2269 MODULE_AUTHOR("Guennadi Liakhovetski <kernel@pengutronix.de>");
2270 MODULE_LICENSE("GPL");
2271 MODULE_ALIAS("platform:soc-camera-pdrv");
Linux kernel - Deliverables
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