2 * camera image capture (abstract) bus driver
4 * Copyright (C) 2008, Guennadi Liakhovetski <kernel@pengutronix.de>
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.
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.
19 #include <linux/module.h>
20 #include <linux/init.h>
21 #include <linux/device.h>
22 #include <linux/list.h>
23 #include <linux/err.h>
24 #include <linux/mutex.h>
25 #include <linux/vmalloc.h>
27 #include <media/v4l2-common.h>
28 #include <media/v4l2-ioctl.h>
29 #include <media/v4l2-dev.h>
30 #include <media/videobuf-core.h>
31 #include <media/soc_camera.h>
33 static LIST_HEAD(hosts);
34 static LIST_HEAD(devices);
35 static DEFINE_MUTEX(list_lock);
37 const struct soc_camera_data_format *soc_camera_format_by_fourcc(
38 struct soc_camera_device *icd, unsigned int fourcc)
42 for (i = 0; i < icd->num_formats; i++)
43 if (icd->formats[i].fourcc == fourcc)
44 return icd->formats + i;
47 EXPORT_SYMBOL(soc_camera_format_by_fourcc);
49 const struct soc_camera_format_xlate *soc_camera_xlate_by_fourcc(
50 struct soc_camera_device *icd, unsigned int fourcc)
54 for (i = 0; i < icd->num_user_formats; i++)
55 if (icd->user_formats[i].host_fmt->fourcc == fourcc)
56 return icd->user_formats + i;
59 EXPORT_SYMBOL(soc_camera_xlate_by_fourcc);
62 * soc_camera_apply_sensor_flags() - apply platform SOCAM_SENSOR_INVERT_* flags
63 * @icl: camera platform parameters
64 * @flags: flags to be inverted according to platform configuration
65 * @return: resulting flags
67 unsigned long soc_camera_apply_sensor_flags(struct soc_camera_link *icl,
72 /* If only one of the two polarities is supported, switch to the opposite */
73 if (icl->flags & SOCAM_SENSOR_INVERT_HSYNC) {
74 f = flags & (SOCAM_HSYNC_ACTIVE_HIGH | SOCAM_HSYNC_ACTIVE_LOW);
75 if (f == SOCAM_HSYNC_ACTIVE_HIGH || f == SOCAM_HSYNC_ACTIVE_LOW)
76 flags ^= SOCAM_HSYNC_ACTIVE_HIGH | SOCAM_HSYNC_ACTIVE_LOW;
79 if (icl->flags & SOCAM_SENSOR_INVERT_VSYNC) {
80 f = flags & (SOCAM_VSYNC_ACTIVE_HIGH | SOCAM_VSYNC_ACTIVE_LOW);
81 if (f == SOCAM_VSYNC_ACTIVE_HIGH || f == SOCAM_VSYNC_ACTIVE_LOW)
82 flags ^= SOCAM_VSYNC_ACTIVE_HIGH | SOCAM_VSYNC_ACTIVE_LOW;
85 if (icl->flags & SOCAM_SENSOR_INVERT_PCLK) {
86 f = flags & (SOCAM_PCLK_SAMPLE_RISING | SOCAM_PCLK_SAMPLE_FALLING);
87 if (f == SOCAM_PCLK_SAMPLE_RISING || f == SOCAM_PCLK_SAMPLE_FALLING)
88 flags ^= SOCAM_PCLK_SAMPLE_RISING | SOCAM_PCLK_SAMPLE_FALLING;
93 EXPORT_SYMBOL(soc_camera_apply_sensor_flags);
95 static int soc_camera_try_fmt_vid_cap(struct file *file, void *priv,
96 struct v4l2_format *f)
98 struct soc_camera_file *icf = file->private_data;
99 struct soc_camera_device *icd = icf->icd;
100 struct soc_camera_host *ici = to_soc_camera_host(icd->dev.parent);
102 WARN_ON(priv != file->private_data);
104 /* limit format to hardware capabilities */
105 return ici->ops->try_fmt(icd, f);
108 static int soc_camera_enum_input(struct file *file, void *priv,
109 struct v4l2_input *inp)
111 struct soc_camera_file *icf = file->private_data;
112 struct soc_camera_device *icd = icf->icd;
118 if (icd->ops->enum_input)
119 ret = icd->ops->enum_input(icd, inp);
121 /* default is camera */
122 inp->type = V4L2_INPUT_TYPE_CAMERA;
123 inp->std = V4L2_STD_UNKNOWN;
124 strcpy(inp->name, "Camera");
130 static int soc_camera_g_input(struct file *file, void *priv, unsigned int *i)
137 static int soc_camera_s_input(struct file *file, void *priv, unsigned int i)
145 static int soc_camera_s_std(struct file *file, void *priv, v4l2_std_id *a)
147 struct soc_camera_file *icf = file->private_data;
148 struct soc_camera_device *icd = icf->icd;
151 if (icd->ops->set_std)
152 ret = icd->ops->set_std(icd, a);
157 static int soc_camera_reqbufs(struct file *file, void *priv,
158 struct v4l2_requestbuffers *p)
161 struct soc_camera_file *icf = file->private_data;
162 struct soc_camera_device *icd = icf->icd;
163 struct soc_camera_host *ici = to_soc_camera_host(icd->dev.parent);
165 WARN_ON(priv != file->private_data);
167 dev_dbg(&icd->dev, "%s: %d\n", __func__, p->memory);
169 ret = videobuf_reqbufs(&icf->vb_vidq, p);
173 return ici->ops->reqbufs(icf, p);
176 static int soc_camera_querybuf(struct file *file, void *priv,
177 struct v4l2_buffer *p)
179 struct soc_camera_file *icf = file->private_data;
181 WARN_ON(priv != file->private_data);
183 return videobuf_querybuf(&icf->vb_vidq, p);
186 static int soc_camera_qbuf(struct file *file, void *priv,
187 struct v4l2_buffer *p)
189 struct soc_camera_file *icf = file->private_data;
191 WARN_ON(priv != file->private_data);
193 return videobuf_qbuf(&icf->vb_vidq, p);
196 static int soc_camera_dqbuf(struct file *file, void *priv,
197 struct v4l2_buffer *p)
199 struct soc_camera_file *icf = file->private_data;
201 WARN_ON(priv != file->private_data);
203 return videobuf_dqbuf(&icf->vb_vidq, p, file->f_flags & O_NONBLOCK);
206 static int soc_camera_init_user_formats(struct soc_camera_device *icd)
208 struct soc_camera_host *ici = to_soc_camera_host(icd->dev.parent);
211 if (!ici->ops->get_formats)
213 * Fallback mode - the host will have to serve all
214 * sensor-provided formats one-to-one to the user
216 fmts = icd->num_formats;
219 * First pass - only count formats this host-sensor
220 * configuration can provide
222 for (i = 0; i < icd->num_formats; i++)
223 fmts += ici->ops->get_formats(icd, i, NULL);
229 vmalloc(fmts * sizeof(struct soc_camera_format_xlate));
230 if (!icd->user_formats)
233 icd->num_user_formats = fmts;
236 dev_dbg(&icd->dev, "Found %d supported formats.\n", fmts);
238 /* Second pass - actually fill data formats */
239 for (i = 0; i < icd->num_formats; i++)
240 if (!ici->ops->get_formats) {
241 icd->user_formats[i].host_fmt = icd->formats + i;
242 icd->user_formats[i].cam_fmt = icd->formats + i;
243 icd->user_formats[i].buswidth = icd->formats[i].depth;
245 fmts += ici->ops->get_formats(icd, i,
246 &icd->user_formats[fmts]);
249 icd->current_fmt = icd->user_formats[0].host_fmt;
254 static void soc_camera_free_user_formats(struct soc_camera_device *icd)
256 vfree(icd->user_formats);
259 static int soc_camera_open(struct file *file)
261 struct video_device *vdev;
262 struct soc_camera_device *icd;
263 struct soc_camera_host *ici;
264 struct soc_camera_file *icf;
267 icf = vmalloc(sizeof(*icf));
272 * It is safe to dereference these pointers now as long as a user has
273 * the video device open - we are protected by the held cdev reference.
276 vdev = video_devdata(file);
277 icd = container_of(vdev->parent, struct soc_camera_device, dev);
278 ici = to_soc_camera_host(icd->dev.parent);
280 if (!try_module_get(icd->ops->owner)) {
281 dev_err(&icd->dev, "Couldn't lock sensor driver.\n");
286 if (!try_module_get(ici->ops->owner)) {
287 dev_err(&icd->dev, "Couldn't lock capture bus driver.\n");
292 /* Protect against icd->remove() until we module_get() both drivers. */
293 mutex_lock(&icd->video_lock);
298 /* Now we really have to activate the camera */
299 if (icd->use_count == 1) {
300 ret = soc_camera_init_user_formats(icd);
303 ret = ici->ops->add(icd);
305 dev_err(&icd->dev, "Couldn't activate the camera: %d\n", ret);
310 mutex_unlock(&icd->video_lock);
312 file->private_data = icf;
313 dev_dbg(&icd->dev, "camera device open\n");
315 ici->ops->init_videobuf(&icf->vb_vidq, icd);
319 /* First two errors are entered with the .video_lock held */
321 soc_camera_free_user_formats(icd);
324 mutex_unlock(&icd->video_lock);
325 module_put(ici->ops->owner);
327 module_put(icd->ops->owner);
333 static int soc_camera_close(struct file *file)
335 struct soc_camera_file *icf = file->private_data;
336 struct soc_camera_device *icd = icf->icd;
337 struct soc_camera_host *ici = to_soc_camera_host(icd->dev.parent);
338 struct video_device *vdev = icd->vdev;
340 mutex_lock(&icd->video_lock);
342 if (!icd->use_count) {
343 ici->ops->remove(icd);
344 soc_camera_free_user_formats(icd);
346 mutex_unlock(&icd->video_lock);
348 module_put(icd->ops->owner);
349 module_put(ici->ops->owner);
353 dev_dbg(vdev->parent, "camera device close\n");
358 static ssize_t soc_camera_read(struct file *file, char __user *buf,
359 size_t count, loff_t *ppos)
361 struct soc_camera_file *icf = file->private_data;
362 struct soc_camera_device *icd = icf->icd;
363 struct video_device *vdev = icd->vdev;
366 dev_err(vdev->parent, "camera device read not implemented\n");
371 static int soc_camera_mmap(struct file *file, struct vm_area_struct *vma)
373 struct soc_camera_file *icf = file->private_data;
374 struct soc_camera_device *icd = icf->icd;
377 dev_dbg(&icd->dev, "mmap called, vma=0x%08lx\n", (unsigned long)vma);
379 err = videobuf_mmap_mapper(&icf->vb_vidq, vma);
381 dev_dbg(&icd->dev, "vma start=0x%08lx, size=%ld, ret=%d\n",
382 (unsigned long)vma->vm_start,
383 (unsigned long)vma->vm_end - (unsigned long)vma->vm_start,
389 static unsigned int soc_camera_poll(struct file *file, poll_table *pt)
391 struct soc_camera_file *icf = file->private_data;
392 struct soc_camera_device *icd = icf->icd;
393 struct soc_camera_host *ici = to_soc_camera_host(icd->dev.parent);
395 if (list_empty(&icf->vb_vidq.stream)) {
396 dev_err(&icd->dev, "Trying to poll with no queued buffers!\n");
400 return ici->ops->poll(file, pt);
403 static struct v4l2_file_operations soc_camera_fops = {
404 .owner = THIS_MODULE,
405 .open = soc_camera_open,
406 .release = soc_camera_close,
407 .ioctl = video_ioctl2,
408 .read = soc_camera_read,
409 .mmap = soc_camera_mmap,
410 .poll = soc_camera_poll,
413 static int soc_camera_s_fmt_vid_cap(struct file *file, void *priv,
414 struct v4l2_format *f)
416 struct soc_camera_file *icf = file->private_data;
417 struct soc_camera_device *icd = icf->icd;
418 struct soc_camera_host *ici = to_soc_camera_host(icd->dev.parent);
419 struct v4l2_pix_format *pix = &f->fmt.pix;
420 __u32 pixfmt = pix->pixelformat;
422 struct v4l2_rect rect;
424 WARN_ON(priv != file->private_data);
426 ret = soc_camera_try_fmt_vid_cap(file, priv, f);
430 mutex_lock(&icf->vb_vidq.vb_lock);
432 if (videobuf_queue_is_busy(&icf->vb_vidq)) {
433 dev_err(&icd->dev, "S_FMT denied: queue busy\n");
438 rect.left = icd->x_current;
439 rect.top = icd->y_current;
440 rect.width = pix->width;
441 rect.height = pix->height;
442 ret = ici->ops->set_fmt(icd, pix->pixelformat, &rect);
445 } else if (!icd->current_fmt ||
446 icd->current_fmt->fourcc != pixfmt) {
448 "Host driver hasn't set up current format correctly!\n");
453 icd->width = rect.width;
454 icd->height = rect.height;
455 icf->vb_vidq.field = pix->field;
456 if (f->type != V4L2_BUF_TYPE_VIDEO_CAPTURE)
457 dev_warn(&icd->dev, "Attention! Wrong buf-type %d\n",
460 dev_dbg(&icd->dev, "set width: %d height: %d\n",
461 icd->width, icd->height);
463 /* set physical bus parameters */
464 ret = ici->ops->set_bus_param(icd, pixfmt);
467 mutex_unlock(&icf->vb_vidq.vb_lock);
472 static int soc_camera_enum_fmt_vid_cap(struct file *file, void *priv,
473 struct v4l2_fmtdesc *f)
475 struct soc_camera_file *icf = file->private_data;
476 struct soc_camera_device *icd = icf->icd;
477 const struct soc_camera_data_format *format;
479 WARN_ON(priv != file->private_data);
481 if (f->index >= icd->num_user_formats)
484 format = icd->user_formats[f->index].host_fmt;
486 strlcpy(f->description, format->name, sizeof(f->description));
487 f->pixelformat = format->fourcc;
491 static int soc_camera_g_fmt_vid_cap(struct file *file, void *priv,
492 struct v4l2_format *f)
494 struct soc_camera_file *icf = file->private_data;
495 struct soc_camera_device *icd = icf->icd;
496 struct v4l2_pix_format *pix = &f->fmt.pix;
498 WARN_ON(priv != file->private_data);
500 pix->width = icd->width;
501 pix->height = icd->height;
502 pix->field = icf->vb_vidq.field;
503 pix->pixelformat = icd->current_fmt->fourcc;
504 pix->bytesperline = pix->width *
505 DIV_ROUND_UP(icd->current_fmt->depth, 8);
506 pix->sizeimage = pix->height * pix->bytesperline;
507 dev_dbg(&icd->dev, "current_fmt->fourcc: 0x%08x\n",
508 icd->current_fmt->fourcc);
512 static int soc_camera_querycap(struct file *file, void *priv,
513 struct v4l2_capability *cap)
515 struct soc_camera_file *icf = file->private_data;
516 struct soc_camera_device *icd = icf->icd;
517 struct soc_camera_host *ici = to_soc_camera_host(icd->dev.parent);
519 WARN_ON(priv != file->private_data);
521 strlcpy(cap->driver, ici->drv_name, sizeof(cap->driver));
522 return ici->ops->querycap(ici, cap);
525 static int soc_camera_streamon(struct file *file, void *priv,
526 enum v4l2_buf_type i)
528 struct soc_camera_file *icf = file->private_data;
529 struct soc_camera_device *icd = icf->icd;
532 WARN_ON(priv != file->private_data);
534 dev_dbg(&icd->dev, "%s\n", __func__);
536 if (i != V4L2_BUF_TYPE_VIDEO_CAPTURE)
539 mutex_lock(&icd->video_lock);
541 icd->ops->start_capture(icd);
543 /* This calls buf_queue from host driver's videobuf_queue_ops */
544 ret = videobuf_streamon(&icf->vb_vidq);
546 mutex_unlock(&icd->video_lock);
551 static int soc_camera_streamoff(struct file *file, void *priv,
552 enum v4l2_buf_type i)
554 struct soc_camera_file *icf = file->private_data;
555 struct soc_camera_device *icd = icf->icd;
557 WARN_ON(priv != file->private_data);
559 dev_dbg(&icd->dev, "%s\n", __func__);
561 if (i != V4L2_BUF_TYPE_VIDEO_CAPTURE)
564 mutex_lock(&icd->video_lock);
566 /* This calls buf_release from host driver's videobuf_queue_ops for all
567 * remaining buffers. When the last buffer is freed, stop capture */
568 videobuf_streamoff(&icf->vb_vidq);
570 icd->ops->stop_capture(icd);
572 mutex_unlock(&icd->video_lock);
577 static int soc_camera_queryctrl(struct file *file, void *priv,
578 struct v4l2_queryctrl *qc)
580 struct soc_camera_file *icf = file->private_data;
581 struct soc_camera_device *icd = icf->icd;
584 WARN_ON(priv != file->private_data);
589 for (i = 0; i < icd->ops->num_controls; i++)
590 if (qc->id == icd->ops->controls[i].id) {
591 memcpy(qc, &(icd->ops->controls[i]),
599 static int soc_camera_g_ctrl(struct file *file, void *priv,
600 struct v4l2_control *ctrl)
602 struct soc_camera_file *icf = file->private_data;
603 struct soc_camera_device *icd = icf->icd;
605 WARN_ON(priv != file->private_data);
609 if (icd->gain == (unsigned short)~0)
611 ctrl->value = icd->gain;
613 case V4L2_CID_EXPOSURE:
614 if (icd->exposure == (unsigned short)~0)
616 ctrl->value = icd->exposure;
620 if (icd->ops->get_control)
621 return icd->ops->get_control(icd, ctrl);
625 static int soc_camera_s_ctrl(struct file *file, void *priv,
626 struct v4l2_control *ctrl)
628 struct soc_camera_file *icf = file->private_data;
629 struct soc_camera_device *icd = icf->icd;
631 WARN_ON(priv != file->private_data);
633 if (icd->ops->set_control)
634 return icd->ops->set_control(icd, ctrl);
638 static int soc_camera_cropcap(struct file *file, void *fh,
639 struct v4l2_cropcap *a)
641 struct soc_camera_file *icf = file->private_data;
642 struct soc_camera_device *icd = icf->icd;
644 a->type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
645 a->bounds.left = icd->x_min;
646 a->bounds.top = icd->y_min;
647 a->bounds.width = icd->width_max;
648 a->bounds.height = icd->height_max;
649 a->defrect.left = icd->x_min;
650 a->defrect.top = icd->y_min;
651 a->defrect.width = 640;
652 a->defrect.height = 480;
653 a->pixelaspect.numerator = 1;
654 a->pixelaspect.denominator = 1;
659 static int soc_camera_g_crop(struct file *file, void *fh,
662 struct soc_camera_file *icf = file->private_data;
663 struct soc_camera_device *icd = icf->icd;
665 a->type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
666 a->c.left = icd->x_current;
667 a->c.top = icd->y_current;
668 a->c.width = icd->width;
669 a->c.height = icd->height;
674 static int soc_camera_s_crop(struct file *file, void *fh,
677 struct soc_camera_file *icf = file->private_data;
678 struct soc_camera_device *icd = icf->icd;
679 struct soc_camera_host *ici = to_soc_camera_host(icd->dev.parent);
682 if (a->type != V4L2_BUF_TYPE_VIDEO_CAPTURE)
685 /* Cropping is allowed during a running capture, guard consistency */
686 mutex_lock(&icf->vb_vidq.vb_lock);
688 ret = ici->ops->set_fmt(icd, 0, &a->c);
690 icd->width = a->c.width;
691 icd->height = a->c.height;
692 icd->x_current = a->c.left;
693 icd->y_current = a->c.top;
696 mutex_unlock(&icf->vb_vidq.vb_lock);
701 static int soc_camera_g_chip_ident(struct file *file, void *fh,
702 struct v4l2_dbg_chip_ident *id)
704 struct soc_camera_file *icf = file->private_data;
705 struct soc_camera_device *icd = icf->icd;
707 if (!icd->ops->get_chip_id)
710 return icd->ops->get_chip_id(icd, id);
713 #ifdef CONFIG_VIDEO_ADV_DEBUG
714 static int soc_camera_g_register(struct file *file, void *fh,
715 struct v4l2_dbg_register *reg)
717 struct soc_camera_file *icf = file->private_data;
718 struct soc_camera_device *icd = icf->icd;
720 if (!icd->ops->get_register)
723 return icd->ops->get_register(icd, reg);
726 static int soc_camera_s_register(struct file *file, void *fh,
727 struct v4l2_dbg_register *reg)
729 struct soc_camera_file *icf = file->private_data;
730 struct soc_camera_device *icd = icf->icd;
732 if (!icd->ops->set_register)
735 return icd->ops->set_register(icd, reg);
739 static int device_register_link(struct soc_camera_device *icd)
741 int ret = device_register(&icd->dev);
744 /* Prevent calling device_unregister() */
745 icd->dev.parent = NULL;
746 dev_err(&icd->dev, "Cannot register device: %d\n", ret);
747 /* Even if probe() was unsuccessful for all registered drivers,
748 * device_register() returns 0, and we add the link, just to
749 * document this camera's control device */
750 } else if (icd->control)
751 /* Have to sysfs_remove_link() before device_unregister()? */
752 if (sysfs_create_link(&icd->dev.kobj, &icd->control->kobj,
755 "Failed creating the control symlink\n");
759 /* So far this function cannot fail */
760 static void scan_add_host(struct soc_camera_host *ici)
762 struct soc_camera_device *icd;
764 mutex_lock(&list_lock);
766 list_for_each_entry(icd, &devices, list) {
767 if (icd->iface == ici->nr) {
768 icd->dev.parent = &ici->dev;
769 device_register_link(icd);
773 mutex_unlock(&list_lock);
776 /* return: 0 if no match found or a match found and
777 * device_register() successful, error code otherwise */
778 static int scan_add_device(struct soc_camera_device *icd)
780 struct soc_camera_host *ici;
783 mutex_lock(&list_lock);
785 list_add_tail(&icd->list, &devices);
787 /* Watch out for class_for_each_device / class_find_device API by
788 * Dave Young <hidave.darkstar@gmail.com> */
789 list_for_each_entry(ici, &hosts, list) {
790 if (icd->iface == ici->nr) {
792 icd->dev.parent = &ici->dev;
797 mutex_unlock(&list_lock);
800 ret = device_register_link(icd);
805 static int soc_camera_probe(struct device *dev)
807 struct soc_camera_device *icd = to_soc_camera_dev(dev);
808 struct soc_camera_host *ici = to_soc_camera_host(icd->dev.parent);
812 * Possible race scenario:
813 * modprobe <camera-host-driver> triggers __func__
814 * at this moment respective <camera-sensor-driver> gets rmmod'ed
815 * to protect take module references.
818 if (!try_module_get(icd->ops->owner)) {
819 dev_err(&icd->dev, "Couldn't lock sensor driver.\n");
824 if (!try_module_get(ici->ops->owner)) {
825 dev_err(&icd->dev, "Couldn't lock capture bus driver.\n");
830 mutex_lock(&icd->video_lock);
832 /* We only call ->add() here to activate and probe the camera.
833 * We shall ->remove() and deactivate it immediately afterwards. */
834 ret = ici->ops->add(icd);
838 ret = icd->ops->probe(icd);
840 const struct v4l2_queryctrl *qctrl;
842 qctrl = soc_camera_find_qctrl(icd->ops, V4L2_CID_GAIN);
843 icd->gain = qctrl ? qctrl->default_value : (unsigned short)~0;
844 qctrl = soc_camera_find_qctrl(icd->ops, V4L2_CID_EXPOSURE);
845 icd->exposure = qctrl ? qctrl->default_value :
848 ici->ops->remove(icd);
851 mutex_unlock(&icd->video_lock);
852 module_put(ici->ops->owner);
854 module_put(icd->ops->owner);
859 /* This is called on device_unregister, which only means we have to disconnect
860 * from the host, but not remove ourselves from the device list */
861 static int soc_camera_remove(struct device *dev)
863 struct soc_camera_device *icd = to_soc_camera_dev(dev);
865 if (icd->ops->remove)
866 icd->ops->remove(icd);
871 static int soc_camera_suspend(struct device *dev, pm_message_t state)
873 struct soc_camera_device *icd = to_soc_camera_dev(dev);
874 struct soc_camera_host *ici = to_soc_camera_host(icd->dev.parent);
877 if (ici->ops->suspend)
878 ret = ici->ops->suspend(icd, state);
883 static int soc_camera_resume(struct device *dev)
885 struct soc_camera_device *icd = to_soc_camera_dev(dev);
886 struct soc_camera_host *ici = to_soc_camera_host(icd->dev.parent);
889 if (ici->ops->resume)
890 ret = ici->ops->resume(icd);
895 static struct bus_type soc_camera_bus_type = {
896 .name = "soc-camera",
897 .probe = soc_camera_probe,
898 .remove = soc_camera_remove,
899 .suspend = soc_camera_suspend,
900 .resume = soc_camera_resume,
903 static struct device_driver ic_drv = {
905 .bus = &soc_camera_bus_type,
906 .owner = THIS_MODULE,
909 static void dummy_release(struct device *dev)
913 int soc_camera_host_register(struct soc_camera_host *ici)
916 struct soc_camera_host *ix;
918 if (!ici || !ici->ops ||
919 !ici->ops->try_fmt ||
920 !ici->ops->set_fmt ||
921 !ici->ops->set_bus_param ||
922 !ici->ops->querycap ||
923 !ici->ops->init_videobuf ||
924 !ici->ops->reqbufs ||
930 /* Number might be equal to the platform device ID */
931 dev_set_name(&ici->dev, "camera_host%d", ici->nr);
933 mutex_lock(&list_lock);
934 list_for_each_entry(ix, &hosts, list) {
935 if (ix->nr == ici->nr) {
936 mutex_unlock(&list_lock);
941 list_add_tail(&ici->list, &hosts);
942 mutex_unlock(&list_lock);
944 ici->dev.release = dummy_release;
946 ret = device_register(&ici->dev);
956 mutex_lock(&list_lock);
957 list_del(&ici->list);
958 mutex_unlock(&list_lock);
962 EXPORT_SYMBOL(soc_camera_host_register);
964 /* Unregister all clients! */
965 void soc_camera_host_unregister(struct soc_camera_host *ici)
967 struct soc_camera_device *icd;
969 mutex_lock(&list_lock);
971 list_del(&ici->list);
973 list_for_each_entry(icd, &devices, list) {
974 if (icd->dev.parent == &ici->dev) {
975 device_unregister(&icd->dev);
976 /* Not before device_unregister(), .remove
977 * needs parent to call ici->ops->remove() */
978 icd->dev.parent = NULL;
979 memset(&icd->dev.kobj, 0, sizeof(icd->dev.kobj));
983 mutex_unlock(&list_lock);
985 device_unregister(&ici->dev);
987 EXPORT_SYMBOL(soc_camera_host_unregister);
989 /* Image capture device */
990 int soc_camera_device_register(struct soc_camera_device *icd)
992 struct soc_camera_device *ix;
995 if (!icd || !icd->ops ||
998 !icd->ops->release ||
999 !icd->ops->start_capture ||
1000 !icd->ops->stop_capture ||
1001 !icd->ops->set_fmt ||
1002 !icd->ops->try_fmt ||
1003 !icd->ops->query_bus_param ||
1004 !icd->ops->set_bus_param)
1007 for (i = 0; i < 256 && num < 0; i++) {
1009 list_for_each_entry(ix, &devices, list) {
1010 if (ix->iface == icd->iface && ix->devnum == i) {
1018 /* ok, we have 256 cameras on this host...
1019 * man, stay reasonable... */
1023 icd->dev.bus = &soc_camera_bus_type;
1024 dev_set_name(&icd->dev, "%u-%u", icd->iface, icd->devnum);
1026 icd->dev.release = dummy_release;
1028 icd->host_priv = NULL;
1029 mutex_init(&icd->video_lock);
1031 return scan_add_device(icd);
1033 EXPORT_SYMBOL(soc_camera_device_register);
1035 void soc_camera_device_unregister(struct soc_camera_device *icd)
1037 mutex_lock(&list_lock);
1038 list_del(&icd->list);
1040 /* The bus->remove will be eventually called */
1041 if (icd->dev.parent)
1042 device_unregister(&icd->dev);
1043 mutex_unlock(&list_lock);
1045 EXPORT_SYMBOL(soc_camera_device_unregister);
1047 static const struct v4l2_ioctl_ops soc_camera_ioctl_ops = {
1048 .vidioc_querycap = soc_camera_querycap,
1049 .vidioc_g_fmt_vid_cap = soc_camera_g_fmt_vid_cap,
1050 .vidioc_enum_fmt_vid_cap = soc_camera_enum_fmt_vid_cap,
1051 .vidioc_s_fmt_vid_cap = soc_camera_s_fmt_vid_cap,
1052 .vidioc_enum_input = soc_camera_enum_input,
1053 .vidioc_g_input = soc_camera_g_input,
1054 .vidioc_s_input = soc_camera_s_input,
1055 .vidioc_s_std = soc_camera_s_std,
1056 .vidioc_reqbufs = soc_camera_reqbufs,
1057 .vidioc_try_fmt_vid_cap = soc_camera_try_fmt_vid_cap,
1058 .vidioc_querybuf = soc_camera_querybuf,
1059 .vidioc_qbuf = soc_camera_qbuf,
1060 .vidioc_dqbuf = soc_camera_dqbuf,
1061 .vidioc_streamon = soc_camera_streamon,
1062 .vidioc_streamoff = soc_camera_streamoff,
1063 .vidioc_queryctrl = soc_camera_queryctrl,
1064 .vidioc_g_ctrl = soc_camera_g_ctrl,
1065 .vidioc_s_ctrl = soc_camera_s_ctrl,
1066 .vidioc_cropcap = soc_camera_cropcap,
1067 .vidioc_g_crop = soc_camera_g_crop,
1068 .vidioc_s_crop = soc_camera_s_crop,
1069 .vidioc_g_chip_ident = soc_camera_g_chip_ident,
1070 #ifdef CONFIG_VIDEO_ADV_DEBUG
1071 .vidioc_g_register = soc_camera_g_register,
1072 .vidioc_s_register = soc_camera_s_register,
1077 * Usually called from the struct soc_camera_ops .probe() method, i.e., from
1078 * soc_camera_probe() above with .video_lock held
1080 int soc_camera_video_start(struct soc_camera_device *icd)
1082 struct soc_camera_host *ici = to_soc_camera_host(icd->dev.parent);
1084 struct video_device *vdev;
1086 if (!icd->dev.parent)
1089 vdev = video_device_alloc();
1092 dev_dbg(&ici->dev, "Allocated video_device %p\n", vdev);
1094 strlcpy(vdev->name, ici->drv_name, sizeof(vdev->name));
1096 vdev->parent = &icd->dev;
1097 vdev->current_norm = V4L2_STD_UNKNOWN;
1098 vdev->fops = &soc_camera_fops;
1099 vdev->ioctl_ops = &soc_camera_ioctl_ops;
1100 vdev->release = video_device_release;
1102 vdev->tvnorms = V4L2_STD_UNKNOWN,
1104 err = video_register_device(vdev, VFL_TYPE_GRABBER, vdev->minor);
1106 dev_err(vdev->parent, "video_register_device failed\n");
1114 video_device_release(vdev);
1118 EXPORT_SYMBOL(soc_camera_video_start);
1120 void soc_camera_video_stop(struct soc_camera_device *icd)
1122 struct video_device *vdev = icd->vdev;
1124 dev_dbg(&icd->dev, "%s\n", __func__);
1126 if (!icd->dev.parent || !vdev)
1129 mutex_lock(&icd->video_lock);
1130 video_unregister_device(vdev);
1132 mutex_unlock(&icd->video_lock);
1134 EXPORT_SYMBOL(soc_camera_video_stop);
1136 static int __init soc_camera_init(void)
1138 int ret = bus_register(&soc_camera_bus_type);
1141 ret = driver_register(&ic_drv);
1148 bus_unregister(&soc_camera_bus_type);
1152 static void __exit soc_camera_exit(void)
1154 driver_unregister(&ic_drv);
1155 bus_unregister(&soc_camera_bus_type);
1158 module_init(soc_camera_init);
1159 module_exit(soc_camera_exit);
1161 MODULE_DESCRIPTION("Image capture bus driver");
1162 MODULE_AUTHOR("Guennadi Liakhovetski <kernel@pengutronix.de>");
1163 MODULE_LICENSE("GPL");