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;
422 WARN_ON(priv != file->private_data);
424 ret = soc_camera_try_fmt_vid_cap(file, priv, f);
428 mutex_lock(&icf->vb_vidq.vb_lock);
430 if (videobuf_queue_is_busy(&icf->vb_vidq)) {
431 dev_err(&icd->dev, "S_FMT denied: queue busy\n");
436 ret = ici->ops->set_fmt(icd, f);
439 } else if (!icd->current_fmt ||
440 icd->current_fmt->fourcc != pix->pixelformat) {
442 "Host driver hasn't set up current format correctly!\n");
447 icd->width = f->fmt.pix.width;
448 icd->height = f->fmt.pix.height;
449 icf->vb_vidq.field = pix->field;
450 if (f->type != V4L2_BUF_TYPE_VIDEO_CAPTURE)
451 dev_warn(&icd->dev, "Attention! Wrong buf-type %d\n",
454 dev_dbg(&icd->dev, "set width: %d height: %d\n",
455 icd->width, icd->height);
457 /* set physical bus parameters */
458 ret = ici->ops->set_bus_param(icd, pix->pixelformat);
461 mutex_unlock(&icf->vb_vidq.vb_lock);
466 static int soc_camera_enum_fmt_vid_cap(struct file *file, void *priv,
467 struct v4l2_fmtdesc *f)
469 struct soc_camera_file *icf = file->private_data;
470 struct soc_camera_device *icd = icf->icd;
471 const struct soc_camera_data_format *format;
473 WARN_ON(priv != file->private_data);
475 if (f->index >= icd->num_user_formats)
478 format = icd->user_formats[f->index].host_fmt;
480 strlcpy(f->description, format->name, sizeof(f->description));
481 f->pixelformat = format->fourcc;
485 static int soc_camera_g_fmt_vid_cap(struct file *file, void *priv,
486 struct v4l2_format *f)
488 struct soc_camera_file *icf = file->private_data;
489 struct soc_camera_device *icd = icf->icd;
490 struct v4l2_pix_format *pix = &f->fmt.pix;
492 WARN_ON(priv != file->private_data);
494 pix->width = icd->width;
495 pix->height = icd->height;
496 pix->field = icf->vb_vidq.field;
497 pix->pixelformat = icd->current_fmt->fourcc;
498 pix->bytesperline = pix->width *
499 DIV_ROUND_UP(icd->current_fmt->depth, 8);
500 pix->sizeimage = pix->height * pix->bytesperline;
501 dev_dbg(&icd->dev, "current_fmt->fourcc: 0x%08x\n",
502 icd->current_fmt->fourcc);
506 static int soc_camera_querycap(struct file *file, void *priv,
507 struct v4l2_capability *cap)
509 struct soc_camera_file *icf = file->private_data;
510 struct soc_camera_device *icd = icf->icd;
511 struct soc_camera_host *ici = to_soc_camera_host(icd->dev.parent);
513 WARN_ON(priv != file->private_data);
515 strlcpy(cap->driver, ici->drv_name, sizeof(cap->driver));
516 return ici->ops->querycap(ici, cap);
519 static int soc_camera_streamon(struct file *file, void *priv,
520 enum v4l2_buf_type i)
522 struct soc_camera_file *icf = file->private_data;
523 struct soc_camera_device *icd = icf->icd;
526 WARN_ON(priv != file->private_data);
528 dev_dbg(&icd->dev, "%s\n", __func__);
530 if (i != V4L2_BUF_TYPE_VIDEO_CAPTURE)
533 mutex_lock(&icd->video_lock);
535 icd->ops->start_capture(icd);
537 /* This calls buf_queue from host driver's videobuf_queue_ops */
538 ret = videobuf_streamon(&icf->vb_vidq);
540 mutex_unlock(&icd->video_lock);
545 static int soc_camera_streamoff(struct file *file, void *priv,
546 enum v4l2_buf_type i)
548 struct soc_camera_file *icf = file->private_data;
549 struct soc_camera_device *icd = icf->icd;
551 WARN_ON(priv != file->private_data);
553 dev_dbg(&icd->dev, "%s\n", __func__);
555 if (i != V4L2_BUF_TYPE_VIDEO_CAPTURE)
558 mutex_lock(&icd->video_lock);
560 /* This calls buf_release from host driver's videobuf_queue_ops for all
561 * remaining buffers. When the last buffer is freed, stop capture */
562 videobuf_streamoff(&icf->vb_vidq);
564 icd->ops->stop_capture(icd);
566 mutex_unlock(&icd->video_lock);
571 static int soc_camera_queryctrl(struct file *file, void *priv,
572 struct v4l2_queryctrl *qc)
574 struct soc_camera_file *icf = file->private_data;
575 struct soc_camera_device *icd = icf->icd;
578 WARN_ON(priv != file->private_data);
583 for (i = 0; i < icd->ops->num_controls; i++)
584 if (qc->id == icd->ops->controls[i].id) {
585 memcpy(qc, &(icd->ops->controls[i]),
593 static int soc_camera_g_ctrl(struct file *file, void *priv,
594 struct v4l2_control *ctrl)
596 struct soc_camera_file *icf = file->private_data;
597 struct soc_camera_device *icd = icf->icd;
599 WARN_ON(priv != file->private_data);
603 if (icd->gain == (unsigned short)~0)
605 ctrl->value = icd->gain;
607 case V4L2_CID_EXPOSURE:
608 if (icd->exposure == (unsigned short)~0)
610 ctrl->value = icd->exposure;
614 if (icd->ops->get_control)
615 return icd->ops->get_control(icd, ctrl);
619 static int soc_camera_s_ctrl(struct file *file, void *priv,
620 struct v4l2_control *ctrl)
622 struct soc_camera_file *icf = file->private_data;
623 struct soc_camera_device *icd = icf->icd;
625 WARN_ON(priv != file->private_data);
627 if (icd->ops->set_control)
628 return icd->ops->set_control(icd, ctrl);
632 static int soc_camera_cropcap(struct file *file, void *fh,
633 struct v4l2_cropcap *a)
635 struct soc_camera_file *icf = file->private_data;
636 struct soc_camera_device *icd = icf->icd;
638 a->type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
639 a->bounds.left = icd->x_min;
640 a->bounds.top = icd->y_min;
641 a->bounds.width = icd->width_max;
642 a->bounds.height = icd->height_max;
643 a->defrect.left = icd->x_min;
644 a->defrect.top = icd->y_min;
645 a->defrect.width = 640;
646 a->defrect.height = 480;
647 a->pixelaspect.numerator = 1;
648 a->pixelaspect.denominator = 1;
653 static int soc_camera_g_crop(struct file *file, void *fh,
656 struct soc_camera_file *icf = file->private_data;
657 struct soc_camera_device *icd = icf->icd;
659 a->type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
660 a->c.left = icd->x_current;
661 a->c.top = icd->y_current;
662 a->c.width = icd->width;
663 a->c.height = icd->height;
668 static int soc_camera_s_crop(struct file *file, void *fh,
671 struct soc_camera_file *icf = file->private_data;
672 struct soc_camera_device *icd = icf->icd;
673 struct soc_camera_host *ici = to_soc_camera_host(icd->dev.parent);
676 if (a->type != V4L2_BUF_TYPE_VIDEO_CAPTURE)
679 /* Cropping is allowed during a running capture, guard consistency */
680 mutex_lock(&icf->vb_vidq.vb_lock);
682 ret = ici->ops->set_crop(icd, &a->c);
684 icd->width = a->c.width;
685 icd->height = a->c.height;
686 icd->x_current = a->c.left;
687 icd->y_current = a->c.top;
690 mutex_unlock(&icf->vb_vidq.vb_lock);
695 static int soc_camera_g_chip_ident(struct file *file, void *fh,
696 struct v4l2_dbg_chip_ident *id)
698 struct soc_camera_file *icf = file->private_data;
699 struct soc_camera_device *icd = icf->icd;
701 if (!icd->ops->get_chip_id)
704 return icd->ops->get_chip_id(icd, id);
707 #ifdef CONFIG_VIDEO_ADV_DEBUG
708 static int soc_camera_g_register(struct file *file, void *fh,
709 struct v4l2_dbg_register *reg)
711 struct soc_camera_file *icf = file->private_data;
712 struct soc_camera_device *icd = icf->icd;
714 if (!icd->ops->get_register)
717 return icd->ops->get_register(icd, reg);
720 static int soc_camera_s_register(struct file *file, void *fh,
721 struct v4l2_dbg_register *reg)
723 struct soc_camera_file *icf = file->private_data;
724 struct soc_camera_device *icd = icf->icd;
726 if (!icd->ops->set_register)
729 return icd->ops->set_register(icd, reg);
733 static int device_register_link(struct soc_camera_device *icd)
735 int ret = device_register(&icd->dev);
738 /* Prevent calling device_unregister() */
739 icd->dev.parent = NULL;
740 dev_err(&icd->dev, "Cannot register device: %d\n", ret);
741 /* Even if probe() was unsuccessful for all registered drivers,
742 * device_register() returns 0, and we add the link, just to
743 * document this camera's control device */
744 } else if (icd->control)
745 /* Have to sysfs_remove_link() before device_unregister()? */
746 if (sysfs_create_link(&icd->dev.kobj, &icd->control->kobj,
749 "Failed creating the control symlink\n");
753 /* So far this function cannot fail */
754 static void scan_add_host(struct soc_camera_host *ici)
756 struct soc_camera_device *icd;
758 mutex_lock(&list_lock);
760 list_for_each_entry(icd, &devices, list) {
761 if (icd->iface == ici->nr) {
762 icd->dev.parent = &ici->dev;
763 device_register_link(icd);
767 mutex_unlock(&list_lock);
770 /* return: 0 if no match found or a match found and
771 * device_register() successful, error code otherwise */
772 static int scan_add_device(struct soc_camera_device *icd)
774 struct soc_camera_host *ici;
777 mutex_lock(&list_lock);
779 list_add_tail(&icd->list, &devices);
781 /* Watch out for class_for_each_device / class_find_device API by
782 * Dave Young <hidave.darkstar@gmail.com> */
783 list_for_each_entry(ici, &hosts, list) {
784 if (icd->iface == ici->nr) {
786 icd->dev.parent = &ici->dev;
791 mutex_unlock(&list_lock);
794 ret = device_register_link(icd);
799 static int soc_camera_probe(struct device *dev)
801 struct soc_camera_device *icd = to_soc_camera_dev(dev);
802 struct soc_camera_host *ici = to_soc_camera_host(icd->dev.parent);
806 * Possible race scenario:
807 * modprobe <camera-host-driver> triggers __func__
808 * at this moment respective <camera-sensor-driver> gets rmmod'ed
809 * to protect take module references.
812 if (!try_module_get(icd->ops->owner)) {
813 dev_err(&icd->dev, "Couldn't lock sensor driver.\n");
818 if (!try_module_get(ici->ops->owner)) {
819 dev_err(&icd->dev, "Couldn't lock capture bus driver.\n");
824 mutex_lock(&icd->video_lock);
826 /* We only call ->add() here to activate and probe the camera.
827 * We shall ->remove() and deactivate it immediately afterwards. */
828 ret = ici->ops->add(icd);
832 ret = icd->ops->probe(icd);
834 const struct v4l2_queryctrl *qctrl;
836 qctrl = soc_camera_find_qctrl(icd->ops, V4L2_CID_GAIN);
837 icd->gain = qctrl ? qctrl->default_value : (unsigned short)~0;
838 qctrl = soc_camera_find_qctrl(icd->ops, V4L2_CID_EXPOSURE);
839 icd->exposure = qctrl ? qctrl->default_value :
842 ici->ops->remove(icd);
845 mutex_unlock(&icd->video_lock);
846 module_put(ici->ops->owner);
848 module_put(icd->ops->owner);
853 /* This is called on device_unregister, which only means we have to disconnect
854 * from the host, but not remove ourselves from the device list */
855 static int soc_camera_remove(struct device *dev)
857 struct soc_camera_device *icd = to_soc_camera_dev(dev);
859 if (icd->ops->remove)
860 icd->ops->remove(icd);
865 static int soc_camera_suspend(struct device *dev, pm_message_t state)
867 struct soc_camera_device *icd = to_soc_camera_dev(dev);
868 struct soc_camera_host *ici = to_soc_camera_host(icd->dev.parent);
871 if (ici->ops->suspend)
872 ret = ici->ops->suspend(icd, state);
877 static int soc_camera_resume(struct device *dev)
879 struct soc_camera_device *icd = to_soc_camera_dev(dev);
880 struct soc_camera_host *ici = to_soc_camera_host(icd->dev.parent);
883 if (ici->ops->resume)
884 ret = ici->ops->resume(icd);
889 static struct bus_type soc_camera_bus_type = {
890 .name = "soc-camera",
891 .probe = soc_camera_probe,
892 .remove = soc_camera_remove,
893 .suspend = soc_camera_suspend,
894 .resume = soc_camera_resume,
897 static struct device_driver ic_drv = {
899 .bus = &soc_camera_bus_type,
900 .owner = THIS_MODULE,
903 static void dummy_release(struct device *dev)
907 int soc_camera_host_register(struct soc_camera_host *ici)
910 struct soc_camera_host *ix;
912 if (!ici || !ici->ops ||
913 !ici->ops->try_fmt ||
914 !ici->ops->set_fmt ||
915 !ici->ops->set_crop ||
916 !ici->ops->set_bus_param ||
917 !ici->ops->querycap ||
918 !ici->ops->init_videobuf ||
919 !ici->ops->reqbufs ||
925 /* Number might be equal to the platform device ID */
926 dev_set_name(&ici->dev, "camera_host%d", ici->nr);
928 mutex_lock(&list_lock);
929 list_for_each_entry(ix, &hosts, list) {
930 if (ix->nr == ici->nr) {
931 mutex_unlock(&list_lock);
936 list_add_tail(&ici->list, &hosts);
937 mutex_unlock(&list_lock);
939 ici->dev.release = dummy_release;
941 ret = device_register(&ici->dev);
951 mutex_lock(&list_lock);
952 list_del(&ici->list);
953 mutex_unlock(&list_lock);
957 EXPORT_SYMBOL(soc_camera_host_register);
959 /* Unregister all clients! */
960 void soc_camera_host_unregister(struct soc_camera_host *ici)
962 struct soc_camera_device *icd;
964 mutex_lock(&list_lock);
966 list_del(&ici->list);
968 list_for_each_entry(icd, &devices, list) {
969 if (icd->dev.parent == &ici->dev) {
970 device_unregister(&icd->dev);
971 /* Not before device_unregister(), .remove
972 * needs parent to call ici->ops->remove() */
973 icd->dev.parent = NULL;
974 memset(&icd->dev.kobj, 0, sizeof(icd->dev.kobj));
978 mutex_unlock(&list_lock);
980 device_unregister(&ici->dev);
982 EXPORT_SYMBOL(soc_camera_host_unregister);
984 /* Image capture device */
985 int soc_camera_device_register(struct soc_camera_device *icd)
987 struct soc_camera_device *ix;
990 if (!icd || !icd->ops ||
993 !icd->ops->release ||
994 !icd->ops->start_capture ||
995 !icd->ops->stop_capture ||
996 !icd->ops->set_crop ||
997 !icd->ops->set_fmt ||
998 !icd->ops->try_fmt ||
999 !icd->ops->query_bus_param ||
1000 !icd->ops->set_bus_param)
1003 for (i = 0; i < 256 && num < 0; i++) {
1005 list_for_each_entry(ix, &devices, list) {
1006 if (ix->iface == icd->iface && ix->devnum == i) {
1014 /* ok, we have 256 cameras on this host...
1015 * man, stay reasonable... */
1019 icd->dev.bus = &soc_camera_bus_type;
1020 dev_set_name(&icd->dev, "%u-%u", icd->iface, icd->devnum);
1022 icd->dev.release = dummy_release;
1024 icd->host_priv = NULL;
1025 mutex_init(&icd->video_lock);
1027 return scan_add_device(icd);
1029 EXPORT_SYMBOL(soc_camera_device_register);
1031 void soc_camera_device_unregister(struct soc_camera_device *icd)
1033 mutex_lock(&list_lock);
1034 list_del(&icd->list);
1036 /* The bus->remove will be eventually called */
1037 if (icd->dev.parent)
1038 device_unregister(&icd->dev);
1039 mutex_unlock(&list_lock);
1041 EXPORT_SYMBOL(soc_camera_device_unregister);
1043 static const struct v4l2_ioctl_ops soc_camera_ioctl_ops = {
1044 .vidioc_querycap = soc_camera_querycap,
1045 .vidioc_g_fmt_vid_cap = soc_camera_g_fmt_vid_cap,
1046 .vidioc_enum_fmt_vid_cap = soc_camera_enum_fmt_vid_cap,
1047 .vidioc_s_fmt_vid_cap = soc_camera_s_fmt_vid_cap,
1048 .vidioc_enum_input = soc_camera_enum_input,
1049 .vidioc_g_input = soc_camera_g_input,
1050 .vidioc_s_input = soc_camera_s_input,
1051 .vidioc_s_std = soc_camera_s_std,
1052 .vidioc_reqbufs = soc_camera_reqbufs,
1053 .vidioc_try_fmt_vid_cap = soc_camera_try_fmt_vid_cap,
1054 .vidioc_querybuf = soc_camera_querybuf,
1055 .vidioc_qbuf = soc_camera_qbuf,
1056 .vidioc_dqbuf = soc_camera_dqbuf,
1057 .vidioc_streamon = soc_camera_streamon,
1058 .vidioc_streamoff = soc_camera_streamoff,
1059 .vidioc_queryctrl = soc_camera_queryctrl,
1060 .vidioc_g_ctrl = soc_camera_g_ctrl,
1061 .vidioc_s_ctrl = soc_camera_s_ctrl,
1062 .vidioc_cropcap = soc_camera_cropcap,
1063 .vidioc_g_crop = soc_camera_g_crop,
1064 .vidioc_s_crop = soc_camera_s_crop,
1065 .vidioc_g_chip_ident = soc_camera_g_chip_ident,
1066 #ifdef CONFIG_VIDEO_ADV_DEBUG
1067 .vidioc_g_register = soc_camera_g_register,
1068 .vidioc_s_register = soc_camera_s_register,
1073 * Usually called from the struct soc_camera_ops .probe() method, i.e., from
1074 * soc_camera_probe() above with .video_lock held
1076 int soc_camera_video_start(struct soc_camera_device *icd)
1078 struct soc_camera_host *ici = to_soc_camera_host(icd->dev.parent);
1080 struct video_device *vdev;
1082 if (!icd->dev.parent)
1085 vdev = video_device_alloc();
1088 dev_dbg(&ici->dev, "Allocated video_device %p\n", vdev);
1090 strlcpy(vdev->name, ici->drv_name, sizeof(vdev->name));
1092 vdev->parent = &icd->dev;
1093 vdev->current_norm = V4L2_STD_UNKNOWN;
1094 vdev->fops = &soc_camera_fops;
1095 vdev->ioctl_ops = &soc_camera_ioctl_ops;
1096 vdev->release = video_device_release;
1098 vdev->tvnorms = V4L2_STD_UNKNOWN,
1100 err = video_register_device(vdev, VFL_TYPE_GRABBER, vdev->minor);
1102 dev_err(vdev->parent, "video_register_device failed\n");
1110 video_device_release(vdev);
1114 EXPORT_SYMBOL(soc_camera_video_start);
1116 void soc_camera_video_stop(struct soc_camera_device *icd)
1118 struct video_device *vdev = icd->vdev;
1120 dev_dbg(&icd->dev, "%s\n", __func__);
1122 if (!icd->dev.parent || !vdev)
1125 mutex_lock(&icd->video_lock);
1126 video_unregister_device(vdev);
1128 mutex_unlock(&icd->video_lock);
1130 EXPORT_SYMBOL(soc_camera_video_stop);
1132 static int __init soc_camera_init(void)
1134 int ret = bus_register(&soc_camera_bus_type);
1137 ret = driver_register(&ic_drv);
1144 bus_unregister(&soc_camera_bus_type);
1148 static void __exit soc_camera_exit(void)
1150 driver_unregister(&ic_drv);
1151 bus_unregister(&soc_camera_bus_type);
1154 module_init(soc_camera_init);
1155 module_exit(soc_camera_exit);
1157 MODULE_DESCRIPTION("Image capture bus driver");
1158 MODULE_AUTHOR("Guennadi Liakhovetski <kernel@pengutronix.de>");
1159 MODULE_LICENSE("GPL");