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 /* Default to VGA resolution */
34 #define DEFAULT_WIDTH 640
35 #define DEFAULT_HEIGHT 480
37 static LIST_HEAD(hosts);
38 static LIST_HEAD(devices);
39 static DEFINE_MUTEX(list_lock);
41 const struct soc_camera_data_format *soc_camera_format_by_fourcc(
42 struct soc_camera_device *icd, unsigned int fourcc)
46 for (i = 0; i < icd->num_formats; i++)
47 if (icd->formats[i].fourcc == fourcc)
48 return icd->formats + i;
51 EXPORT_SYMBOL(soc_camera_format_by_fourcc);
53 const struct soc_camera_format_xlate *soc_camera_xlate_by_fourcc(
54 struct soc_camera_device *icd, unsigned int fourcc)
58 for (i = 0; i < icd->num_user_formats; i++)
59 if (icd->user_formats[i].host_fmt->fourcc == fourcc)
60 return icd->user_formats + i;
63 EXPORT_SYMBOL(soc_camera_xlate_by_fourcc);
66 * soc_camera_apply_sensor_flags() - apply platform SOCAM_SENSOR_INVERT_* flags
67 * @icl: camera platform parameters
68 * @flags: flags to be inverted according to platform configuration
69 * @return: resulting flags
71 unsigned long soc_camera_apply_sensor_flags(struct soc_camera_link *icl,
76 /* If only one of the two polarities is supported, switch to the opposite */
77 if (icl->flags & SOCAM_SENSOR_INVERT_HSYNC) {
78 f = flags & (SOCAM_HSYNC_ACTIVE_HIGH | SOCAM_HSYNC_ACTIVE_LOW);
79 if (f == SOCAM_HSYNC_ACTIVE_HIGH || f == SOCAM_HSYNC_ACTIVE_LOW)
80 flags ^= SOCAM_HSYNC_ACTIVE_HIGH | SOCAM_HSYNC_ACTIVE_LOW;
83 if (icl->flags & SOCAM_SENSOR_INVERT_VSYNC) {
84 f = flags & (SOCAM_VSYNC_ACTIVE_HIGH | SOCAM_VSYNC_ACTIVE_LOW);
85 if (f == SOCAM_VSYNC_ACTIVE_HIGH || f == SOCAM_VSYNC_ACTIVE_LOW)
86 flags ^= SOCAM_VSYNC_ACTIVE_HIGH | SOCAM_VSYNC_ACTIVE_LOW;
89 if (icl->flags & SOCAM_SENSOR_INVERT_PCLK) {
90 f = flags & (SOCAM_PCLK_SAMPLE_RISING | SOCAM_PCLK_SAMPLE_FALLING);
91 if (f == SOCAM_PCLK_SAMPLE_RISING || f == SOCAM_PCLK_SAMPLE_FALLING)
92 flags ^= SOCAM_PCLK_SAMPLE_RISING | SOCAM_PCLK_SAMPLE_FALLING;
97 EXPORT_SYMBOL(soc_camera_apply_sensor_flags);
99 static int soc_camera_try_fmt_vid_cap(struct file *file, void *priv,
100 struct v4l2_format *f)
102 struct soc_camera_file *icf = file->private_data;
103 struct soc_camera_device *icd = icf->icd;
104 struct soc_camera_host *ici = to_soc_camera_host(icd->dev.parent);
106 WARN_ON(priv != file->private_data);
108 /* limit format to hardware capabilities */
109 return ici->ops->try_fmt(icd, f);
112 static int soc_camera_enum_input(struct file *file, void *priv,
113 struct v4l2_input *inp)
115 struct soc_camera_file *icf = file->private_data;
116 struct soc_camera_device *icd = icf->icd;
122 if (icd->ops->enum_input)
123 ret = icd->ops->enum_input(icd, inp);
125 /* default is camera */
126 inp->type = V4L2_INPUT_TYPE_CAMERA;
127 inp->std = V4L2_STD_UNKNOWN;
128 strcpy(inp->name, "Camera");
134 static int soc_camera_g_input(struct file *file, void *priv, unsigned int *i)
141 static int soc_camera_s_input(struct file *file, void *priv, unsigned int i)
149 static int soc_camera_s_std(struct file *file, void *priv, v4l2_std_id *a)
151 struct soc_camera_file *icf = file->private_data;
152 struct soc_camera_device *icd = icf->icd;
155 if (icd->ops->set_std)
156 ret = icd->ops->set_std(icd, a);
161 static int soc_camera_reqbufs(struct file *file, void *priv,
162 struct v4l2_requestbuffers *p)
165 struct soc_camera_file *icf = file->private_data;
166 struct soc_camera_device *icd = icf->icd;
167 struct soc_camera_host *ici = to_soc_camera_host(icd->dev.parent);
169 WARN_ON(priv != file->private_data);
171 dev_dbg(&icd->dev, "%s: %d\n", __func__, p->memory);
173 ret = videobuf_reqbufs(&icf->vb_vidq, p);
177 return ici->ops->reqbufs(icf, p);
180 static int soc_camera_querybuf(struct file *file, void *priv,
181 struct v4l2_buffer *p)
183 struct soc_camera_file *icf = file->private_data;
185 WARN_ON(priv != file->private_data);
187 return videobuf_querybuf(&icf->vb_vidq, p);
190 static int soc_camera_qbuf(struct file *file, void *priv,
191 struct v4l2_buffer *p)
193 struct soc_camera_file *icf = file->private_data;
195 WARN_ON(priv != file->private_data);
197 return videobuf_qbuf(&icf->vb_vidq, p);
200 static int soc_camera_dqbuf(struct file *file, void *priv,
201 struct v4l2_buffer *p)
203 struct soc_camera_file *icf = file->private_data;
205 WARN_ON(priv != file->private_data);
207 return videobuf_dqbuf(&icf->vb_vidq, p, file->f_flags & O_NONBLOCK);
210 static int soc_camera_init_user_formats(struct soc_camera_device *icd)
212 struct soc_camera_host *ici = to_soc_camera_host(icd->dev.parent);
215 if (!ici->ops->get_formats)
217 * Fallback mode - the host will have to serve all
218 * sensor-provided formats one-to-one to the user
220 fmts = icd->num_formats;
223 * First pass - only count formats this host-sensor
224 * configuration can provide
226 for (i = 0; i < icd->num_formats; i++)
227 fmts += ici->ops->get_formats(icd, i, NULL);
233 vmalloc(fmts * sizeof(struct soc_camera_format_xlate));
234 if (!icd->user_formats)
237 icd->num_user_formats = fmts;
240 dev_dbg(&icd->dev, "Found %d supported formats.\n", fmts);
242 /* Second pass - actually fill data formats */
243 for (i = 0; i < icd->num_formats; i++)
244 if (!ici->ops->get_formats) {
245 icd->user_formats[i].host_fmt = icd->formats + i;
246 icd->user_formats[i].cam_fmt = icd->formats + i;
247 icd->user_formats[i].buswidth = icd->formats[i].depth;
249 fmts += ici->ops->get_formats(icd, i,
250 &icd->user_formats[fmts]);
253 icd->current_fmt = icd->user_formats[0].host_fmt;
258 static void soc_camera_free_user_formats(struct soc_camera_device *icd)
260 vfree(icd->user_formats);
263 /* Called with .vb_lock held */
264 static int soc_camera_set_fmt(struct soc_camera_file *icf,
265 struct v4l2_format *f)
267 struct soc_camera_device *icd = icf->icd;
268 struct soc_camera_host *ici = to_soc_camera_host(icd->dev.parent);
269 struct v4l2_pix_format *pix = &f->fmt.pix;
272 /* We always call try_fmt() before set_fmt() or set_crop() */
273 ret = ici->ops->try_fmt(icd, f);
277 ret = ici->ops->set_fmt(icd, f);
280 } else if (!icd->current_fmt ||
281 icd->current_fmt->fourcc != pix->pixelformat) {
283 "Host driver hasn't set up current format correctly!\n");
287 icd->width = pix->width;
288 icd->height = pix->height;
289 icf->vb_vidq.field = pix->field;
290 if (f->type != V4L2_BUF_TYPE_VIDEO_CAPTURE)
291 dev_warn(&icd->dev, "Attention! Wrong buf-type %d\n",
294 dev_dbg(&icd->dev, "set width: %d height: %d\n",
295 icd->width, icd->height);
297 /* set physical bus parameters */
298 return ici->ops->set_bus_param(icd, pix->pixelformat);
301 static int soc_camera_open(struct file *file)
303 struct video_device *vdev;
304 struct soc_camera_device *icd;
305 struct soc_camera_host *ici;
306 struct soc_camera_file *icf;
309 icf = vmalloc(sizeof(*icf));
314 * It is safe to dereference these pointers now as long as a user has
315 * the video device open - we are protected by the held cdev reference.
318 vdev = video_devdata(file);
319 icd = container_of(vdev->parent, struct soc_camera_device, dev);
320 ici = to_soc_camera_host(icd->dev.parent);
322 if (!try_module_get(icd->ops->owner)) {
323 dev_err(&icd->dev, "Couldn't lock sensor driver.\n");
328 if (!try_module_get(ici->ops->owner)) {
329 dev_err(&icd->dev, "Couldn't lock capture bus driver.\n");
334 /* Protect against icd->remove() until we module_get() both drivers. */
335 mutex_lock(&icd->video_lock);
340 /* Now we really have to activate the camera */
341 if (icd->use_count == 1) {
342 struct v4l2_format f = {
343 .type = V4L2_BUF_TYPE_VIDEO_CAPTURE,
345 .width = DEFAULT_WIDTH,
346 .height = DEFAULT_HEIGHT,
347 .field = V4L2_FIELD_ANY,
351 ret = soc_camera_init_user_formats(icd);
354 ret = ici->ops->add(icd);
356 dev_err(&icd->dev, "Couldn't activate the camera: %d\n", ret);
360 f.fmt.pix.pixelformat = icd->current_fmt->fourcc;
361 f.fmt.pix.colorspace = icd->current_fmt->colorspace;
363 /* Try to configure with default parameters */
364 ret = soc_camera_set_fmt(icf, &f);
369 mutex_unlock(&icd->video_lock);
371 file->private_data = icf;
372 dev_dbg(&icd->dev, "camera device open\n");
374 ici->ops->init_videobuf(&icf->vb_vidq, icd);
379 * First three errors are entered with the .video_lock held
383 ici->ops->remove(icd);
385 soc_camera_free_user_formats(icd);
388 mutex_unlock(&icd->video_lock);
389 module_put(ici->ops->owner);
391 module_put(icd->ops->owner);
397 static int soc_camera_close(struct file *file)
399 struct soc_camera_file *icf = file->private_data;
400 struct soc_camera_device *icd = icf->icd;
401 struct soc_camera_host *ici = to_soc_camera_host(icd->dev.parent);
402 struct video_device *vdev = icd->vdev;
404 mutex_lock(&icd->video_lock);
406 if (!icd->use_count) {
407 ici->ops->remove(icd);
408 soc_camera_free_user_formats(icd);
410 mutex_unlock(&icd->video_lock);
412 module_put(icd->ops->owner);
413 module_put(ici->ops->owner);
417 dev_dbg(vdev->parent, "camera device close\n");
422 static ssize_t soc_camera_read(struct file *file, char __user *buf,
423 size_t count, loff_t *ppos)
425 struct soc_camera_file *icf = file->private_data;
426 struct soc_camera_device *icd = icf->icd;
427 struct video_device *vdev = icd->vdev;
430 dev_err(vdev->parent, "camera device read not implemented\n");
435 static int soc_camera_mmap(struct file *file, struct vm_area_struct *vma)
437 struct soc_camera_file *icf = file->private_data;
438 struct soc_camera_device *icd = icf->icd;
441 dev_dbg(&icd->dev, "mmap called, vma=0x%08lx\n", (unsigned long)vma);
443 err = videobuf_mmap_mapper(&icf->vb_vidq, vma);
445 dev_dbg(&icd->dev, "vma start=0x%08lx, size=%ld, ret=%d\n",
446 (unsigned long)vma->vm_start,
447 (unsigned long)vma->vm_end - (unsigned long)vma->vm_start,
453 static unsigned int soc_camera_poll(struct file *file, poll_table *pt)
455 struct soc_camera_file *icf = file->private_data;
456 struct soc_camera_device *icd = icf->icd;
457 struct soc_camera_host *ici = to_soc_camera_host(icd->dev.parent);
459 if (list_empty(&icf->vb_vidq.stream)) {
460 dev_err(&icd->dev, "Trying to poll with no queued buffers!\n");
464 return ici->ops->poll(file, pt);
467 static struct v4l2_file_operations soc_camera_fops = {
468 .owner = THIS_MODULE,
469 .open = soc_camera_open,
470 .release = soc_camera_close,
471 .ioctl = video_ioctl2,
472 .read = soc_camera_read,
473 .mmap = soc_camera_mmap,
474 .poll = soc_camera_poll,
477 static int soc_camera_s_fmt_vid_cap(struct file *file, void *priv,
478 struct v4l2_format *f)
480 struct soc_camera_file *icf = file->private_data;
481 struct soc_camera_device *icd = icf->icd;
484 WARN_ON(priv != file->private_data);
486 mutex_lock(&icf->vb_vidq.vb_lock);
488 if (videobuf_queue_is_busy(&icf->vb_vidq)) {
489 dev_err(&icd->dev, "S_FMT denied: queue busy\n");
494 ret = soc_camera_set_fmt(icf, f);
497 mutex_unlock(&icf->vb_vidq.vb_lock);
502 static int soc_camera_enum_fmt_vid_cap(struct file *file, void *priv,
503 struct v4l2_fmtdesc *f)
505 struct soc_camera_file *icf = file->private_data;
506 struct soc_camera_device *icd = icf->icd;
507 const struct soc_camera_data_format *format;
509 WARN_ON(priv != file->private_data);
511 if (f->index >= icd->num_user_formats)
514 format = icd->user_formats[f->index].host_fmt;
516 strlcpy(f->description, format->name, sizeof(f->description));
517 f->pixelformat = format->fourcc;
521 static int soc_camera_g_fmt_vid_cap(struct file *file, void *priv,
522 struct v4l2_format *f)
524 struct soc_camera_file *icf = file->private_data;
525 struct soc_camera_device *icd = icf->icd;
526 struct v4l2_pix_format *pix = &f->fmt.pix;
528 WARN_ON(priv != file->private_data);
530 pix->width = icd->width;
531 pix->height = icd->height;
532 pix->field = icf->vb_vidq.field;
533 pix->pixelformat = icd->current_fmt->fourcc;
534 pix->bytesperline = pix->width *
535 DIV_ROUND_UP(icd->current_fmt->depth, 8);
536 pix->sizeimage = pix->height * pix->bytesperline;
537 dev_dbg(&icd->dev, "current_fmt->fourcc: 0x%08x\n",
538 icd->current_fmt->fourcc);
542 static int soc_camera_querycap(struct file *file, void *priv,
543 struct v4l2_capability *cap)
545 struct soc_camera_file *icf = file->private_data;
546 struct soc_camera_device *icd = icf->icd;
547 struct soc_camera_host *ici = to_soc_camera_host(icd->dev.parent);
549 WARN_ON(priv != file->private_data);
551 strlcpy(cap->driver, ici->drv_name, sizeof(cap->driver));
552 return ici->ops->querycap(ici, cap);
555 static int soc_camera_streamon(struct file *file, void *priv,
556 enum v4l2_buf_type i)
558 struct soc_camera_file *icf = file->private_data;
559 struct soc_camera_device *icd = icf->icd;
562 WARN_ON(priv != file->private_data);
564 dev_dbg(&icd->dev, "%s\n", __func__);
566 if (i != V4L2_BUF_TYPE_VIDEO_CAPTURE)
569 mutex_lock(&icd->video_lock);
571 icd->ops->start_capture(icd);
573 /* This calls buf_queue from host driver's videobuf_queue_ops */
574 ret = videobuf_streamon(&icf->vb_vidq);
576 mutex_unlock(&icd->video_lock);
581 static int soc_camera_streamoff(struct file *file, void *priv,
582 enum v4l2_buf_type i)
584 struct soc_camera_file *icf = file->private_data;
585 struct soc_camera_device *icd = icf->icd;
587 WARN_ON(priv != file->private_data);
589 dev_dbg(&icd->dev, "%s\n", __func__);
591 if (i != V4L2_BUF_TYPE_VIDEO_CAPTURE)
594 mutex_lock(&icd->video_lock);
596 /* This calls buf_release from host driver's videobuf_queue_ops for all
597 * remaining buffers. When the last buffer is freed, stop capture */
598 videobuf_streamoff(&icf->vb_vidq);
600 icd->ops->stop_capture(icd);
602 mutex_unlock(&icd->video_lock);
607 static int soc_camera_queryctrl(struct file *file, void *priv,
608 struct v4l2_queryctrl *qc)
610 struct soc_camera_file *icf = file->private_data;
611 struct soc_camera_device *icd = icf->icd;
614 WARN_ON(priv != file->private_data);
619 for (i = 0; i < icd->ops->num_controls; i++)
620 if (qc->id == icd->ops->controls[i].id) {
621 memcpy(qc, &(icd->ops->controls[i]),
629 static int soc_camera_g_ctrl(struct file *file, void *priv,
630 struct v4l2_control *ctrl)
632 struct soc_camera_file *icf = file->private_data;
633 struct soc_camera_device *icd = icf->icd;
635 WARN_ON(priv != file->private_data);
639 if (icd->gain == (unsigned short)~0)
641 ctrl->value = icd->gain;
643 case V4L2_CID_EXPOSURE:
644 if (icd->exposure == (unsigned short)~0)
646 ctrl->value = icd->exposure;
650 if (icd->ops->get_control)
651 return icd->ops->get_control(icd, ctrl);
655 static int soc_camera_s_ctrl(struct file *file, void *priv,
656 struct v4l2_control *ctrl)
658 struct soc_camera_file *icf = file->private_data;
659 struct soc_camera_device *icd = icf->icd;
661 WARN_ON(priv != file->private_data);
663 if (icd->ops->set_control)
664 return icd->ops->set_control(icd, ctrl);
668 static int soc_camera_cropcap(struct file *file, void *fh,
669 struct v4l2_cropcap *a)
671 struct soc_camera_file *icf = file->private_data;
672 struct soc_camera_device *icd = icf->icd;
674 a->type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
675 a->bounds.left = icd->x_min;
676 a->bounds.top = icd->y_min;
677 a->bounds.width = icd->width_max;
678 a->bounds.height = icd->height_max;
679 a->defrect.left = icd->x_min;
680 a->defrect.top = icd->y_min;
681 a->defrect.width = DEFAULT_WIDTH;
682 a->defrect.height = DEFAULT_HEIGHT;
683 a->pixelaspect.numerator = 1;
684 a->pixelaspect.denominator = 1;
689 static int soc_camera_g_crop(struct file *file, void *fh,
692 struct soc_camera_file *icf = file->private_data;
693 struct soc_camera_device *icd = icf->icd;
695 a->type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
696 a->c.left = icd->x_current;
697 a->c.top = icd->y_current;
698 a->c.width = icd->width;
699 a->c.height = icd->height;
704 static int soc_camera_s_crop(struct file *file, void *fh,
707 struct soc_camera_file *icf = file->private_data;
708 struct soc_camera_device *icd = icf->icd;
709 struct soc_camera_host *ici = to_soc_camera_host(icd->dev.parent);
712 if (a->type != V4L2_BUF_TYPE_VIDEO_CAPTURE)
715 /* Cropping is allowed during a running capture, guard consistency */
716 mutex_lock(&icf->vb_vidq.vb_lock);
718 ret = ici->ops->set_crop(icd, &a->c);
720 icd->width = a->c.width;
721 icd->height = a->c.height;
722 icd->x_current = a->c.left;
723 icd->y_current = a->c.top;
726 mutex_unlock(&icf->vb_vidq.vb_lock);
731 static int soc_camera_g_chip_ident(struct file *file, void *fh,
732 struct v4l2_dbg_chip_ident *id)
734 struct soc_camera_file *icf = file->private_data;
735 struct soc_camera_device *icd = icf->icd;
737 if (!icd->ops->get_chip_id)
740 return icd->ops->get_chip_id(icd, id);
743 #ifdef CONFIG_VIDEO_ADV_DEBUG
744 static int soc_camera_g_register(struct file *file, void *fh,
745 struct v4l2_dbg_register *reg)
747 struct soc_camera_file *icf = file->private_data;
748 struct soc_camera_device *icd = icf->icd;
750 if (!icd->ops->get_register)
753 return icd->ops->get_register(icd, reg);
756 static int soc_camera_s_register(struct file *file, void *fh,
757 struct v4l2_dbg_register *reg)
759 struct soc_camera_file *icf = file->private_data;
760 struct soc_camera_device *icd = icf->icd;
762 if (!icd->ops->set_register)
765 return icd->ops->set_register(icd, reg);
769 static int device_register_link(struct soc_camera_device *icd)
771 int ret = device_register(&icd->dev);
774 /* Prevent calling device_unregister() */
775 icd->dev.parent = NULL;
776 dev_err(&icd->dev, "Cannot register device: %d\n", ret);
777 /* Even if probe() was unsuccessful for all registered drivers,
778 * device_register() returns 0, and we add the link, just to
779 * document this camera's control device */
780 } else if (icd->control)
781 /* Have to sysfs_remove_link() before device_unregister()? */
782 if (sysfs_create_link(&icd->dev.kobj, &icd->control->kobj,
785 "Failed creating the control symlink\n");
789 /* So far this function cannot fail */
790 static void scan_add_host(struct soc_camera_host *ici)
792 struct soc_camera_device *icd;
794 mutex_lock(&list_lock);
796 list_for_each_entry(icd, &devices, list) {
797 if (icd->iface == ici->nr) {
798 icd->dev.parent = &ici->dev;
799 device_register_link(icd);
803 mutex_unlock(&list_lock);
806 /* return: 0 if no match found or a match found and
807 * device_register() successful, error code otherwise */
808 static int scan_add_device(struct soc_camera_device *icd)
810 struct soc_camera_host *ici;
813 mutex_lock(&list_lock);
815 list_add_tail(&icd->list, &devices);
817 /* Watch out for class_for_each_device / class_find_device API by
818 * Dave Young <hidave.darkstar@gmail.com> */
819 list_for_each_entry(ici, &hosts, list) {
820 if (icd->iface == ici->nr) {
822 icd->dev.parent = &ici->dev;
827 mutex_unlock(&list_lock);
830 ret = device_register_link(icd);
835 static int soc_camera_probe(struct device *dev)
837 struct soc_camera_device *icd = to_soc_camera_dev(dev);
838 struct soc_camera_host *ici = to_soc_camera_host(icd->dev.parent);
842 * Possible race scenario:
843 * modprobe <camera-host-driver> triggers __func__
844 * at this moment respective <camera-sensor-driver> gets rmmod'ed
845 * to protect take module references.
848 if (!try_module_get(icd->ops->owner)) {
849 dev_err(&icd->dev, "Couldn't lock sensor driver.\n");
854 if (!try_module_get(ici->ops->owner)) {
855 dev_err(&icd->dev, "Couldn't lock capture bus driver.\n");
860 mutex_lock(&icd->video_lock);
862 /* We only call ->add() here to activate and probe the camera.
863 * We shall ->remove() and deactivate it immediately afterwards. */
864 ret = ici->ops->add(icd);
868 ret = icd->ops->probe(icd);
870 const struct v4l2_queryctrl *qctrl;
872 qctrl = soc_camera_find_qctrl(icd->ops, V4L2_CID_GAIN);
873 icd->gain = qctrl ? qctrl->default_value : (unsigned short)~0;
874 qctrl = soc_camera_find_qctrl(icd->ops, V4L2_CID_EXPOSURE);
875 icd->exposure = qctrl ? qctrl->default_value :
878 ici->ops->remove(icd);
881 mutex_unlock(&icd->video_lock);
882 module_put(ici->ops->owner);
884 module_put(icd->ops->owner);
889 /* This is called on device_unregister, which only means we have to disconnect
890 * from the host, but not remove ourselves from the device list */
891 static int soc_camera_remove(struct device *dev)
893 struct soc_camera_device *icd = to_soc_camera_dev(dev);
895 if (icd->ops->remove)
896 icd->ops->remove(icd);
901 static int soc_camera_suspend(struct device *dev, pm_message_t state)
903 struct soc_camera_device *icd = to_soc_camera_dev(dev);
904 struct soc_camera_host *ici = to_soc_camera_host(icd->dev.parent);
907 if (ici->ops->suspend)
908 ret = ici->ops->suspend(icd, state);
913 static int soc_camera_resume(struct device *dev)
915 struct soc_camera_device *icd = to_soc_camera_dev(dev);
916 struct soc_camera_host *ici = to_soc_camera_host(icd->dev.parent);
919 if (ici->ops->resume)
920 ret = ici->ops->resume(icd);
925 static struct bus_type soc_camera_bus_type = {
926 .name = "soc-camera",
927 .probe = soc_camera_probe,
928 .remove = soc_camera_remove,
929 .suspend = soc_camera_suspend,
930 .resume = soc_camera_resume,
933 static struct device_driver ic_drv = {
935 .bus = &soc_camera_bus_type,
936 .owner = THIS_MODULE,
939 static void dummy_release(struct device *dev)
943 int soc_camera_host_register(struct soc_camera_host *ici)
946 struct soc_camera_host *ix;
948 if (!ici || !ici->ops ||
949 !ici->ops->try_fmt ||
950 !ici->ops->set_fmt ||
951 !ici->ops->set_crop ||
952 !ici->ops->set_bus_param ||
953 !ici->ops->querycap ||
954 !ici->ops->init_videobuf ||
955 !ici->ops->reqbufs ||
961 /* Number might be equal to the platform device ID */
962 dev_set_name(&ici->dev, "camera_host%d", ici->nr);
964 mutex_lock(&list_lock);
965 list_for_each_entry(ix, &hosts, list) {
966 if (ix->nr == ici->nr) {
967 mutex_unlock(&list_lock);
972 list_add_tail(&ici->list, &hosts);
973 mutex_unlock(&list_lock);
975 ici->dev.release = dummy_release;
977 ret = device_register(&ici->dev);
987 mutex_lock(&list_lock);
988 list_del(&ici->list);
989 mutex_unlock(&list_lock);
993 EXPORT_SYMBOL(soc_camera_host_register);
995 /* Unregister all clients! */
996 void soc_camera_host_unregister(struct soc_camera_host *ici)
998 struct soc_camera_device *icd;
1000 mutex_lock(&list_lock);
1002 list_del(&ici->list);
1004 list_for_each_entry(icd, &devices, list) {
1005 if (icd->dev.parent == &ici->dev) {
1006 device_unregister(&icd->dev);
1007 /* Not before device_unregister(), .remove
1008 * needs parent to call ici->ops->remove() */
1009 icd->dev.parent = NULL;
1010 memset(&icd->dev.kobj, 0, sizeof(icd->dev.kobj));
1014 mutex_unlock(&list_lock);
1016 device_unregister(&ici->dev);
1018 EXPORT_SYMBOL(soc_camera_host_unregister);
1020 /* Image capture device */
1021 int soc_camera_device_register(struct soc_camera_device *icd)
1023 struct soc_camera_device *ix;
1026 if (!icd || !icd->ops ||
1029 !icd->ops->release ||
1030 !icd->ops->start_capture ||
1031 !icd->ops->stop_capture ||
1032 !icd->ops->set_crop ||
1033 !icd->ops->set_fmt ||
1034 !icd->ops->try_fmt ||
1035 !icd->ops->query_bus_param ||
1036 !icd->ops->set_bus_param)
1039 for (i = 0; i < 256 && num < 0; i++) {
1041 list_for_each_entry(ix, &devices, list) {
1042 if (ix->iface == icd->iface && ix->devnum == i) {
1050 /* ok, we have 256 cameras on this host...
1051 * man, stay reasonable... */
1055 icd->dev.bus = &soc_camera_bus_type;
1056 dev_set_name(&icd->dev, "%u-%u", icd->iface, icd->devnum);
1058 icd->dev.release = dummy_release;
1060 icd->host_priv = NULL;
1061 mutex_init(&icd->video_lock);
1063 return scan_add_device(icd);
1065 EXPORT_SYMBOL(soc_camera_device_register);
1067 void soc_camera_device_unregister(struct soc_camera_device *icd)
1069 mutex_lock(&list_lock);
1070 list_del(&icd->list);
1072 /* The bus->remove will be eventually called */
1073 if (icd->dev.parent)
1074 device_unregister(&icd->dev);
1075 mutex_unlock(&list_lock);
1077 EXPORT_SYMBOL(soc_camera_device_unregister);
1079 static const struct v4l2_ioctl_ops soc_camera_ioctl_ops = {
1080 .vidioc_querycap = soc_camera_querycap,
1081 .vidioc_g_fmt_vid_cap = soc_camera_g_fmt_vid_cap,
1082 .vidioc_enum_fmt_vid_cap = soc_camera_enum_fmt_vid_cap,
1083 .vidioc_s_fmt_vid_cap = soc_camera_s_fmt_vid_cap,
1084 .vidioc_enum_input = soc_camera_enum_input,
1085 .vidioc_g_input = soc_camera_g_input,
1086 .vidioc_s_input = soc_camera_s_input,
1087 .vidioc_s_std = soc_camera_s_std,
1088 .vidioc_reqbufs = soc_camera_reqbufs,
1089 .vidioc_try_fmt_vid_cap = soc_camera_try_fmt_vid_cap,
1090 .vidioc_querybuf = soc_camera_querybuf,
1091 .vidioc_qbuf = soc_camera_qbuf,
1092 .vidioc_dqbuf = soc_camera_dqbuf,
1093 .vidioc_streamon = soc_camera_streamon,
1094 .vidioc_streamoff = soc_camera_streamoff,
1095 .vidioc_queryctrl = soc_camera_queryctrl,
1096 .vidioc_g_ctrl = soc_camera_g_ctrl,
1097 .vidioc_s_ctrl = soc_camera_s_ctrl,
1098 .vidioc_cropcap = soc_camera_cropcap,
1099 .vidioc_g_crop = soc_camera_g_crop,
1100 .vidioc_s_crop = soc_camera_s_crop,
1101 .vidioc_g_chip_ident = soc_camera_g_chip_ident,
1102 #ifdef CONFIG_VIDEO_ADV_DEBUG
1103 .vidioc_g_register = soc_camera_g_register,
1104 .vidioc_s_register = soc_camera_s_register,
1109 * Usually called from the struct soc_camera_ops .probe() method, i.e., from
1110 * soc_camera_probe() above with .video_lock held
1112 int soc_camera_video_start(struct soc_camera_device *icd)
1114 struct soc_camera_host *ici = to_soc_camera_host(icd->dev.parent);
1116 struct video_device *vdev;
1118 if (!icd->dev.parent)
1121 vdev = video_device_alloc();
1124 dev_dbg(&ici->dev, "Allocated video_device %p\n", vdev);
1126 strlcpy(vdev->name, ici->drv_name, sizeof(vdev->name));
1128 vdev->parent = &icd->dev;
1129 vdev->current_norm = V4L2_STD_UNKNOWN;
1130 vdev->fops = &soc_camera_fops;
1131 vdev->ioctl_ops = &soc_camera_ioctl_ops;
1132 vdev->release = video_device_release;
1134 vdev->tvnorms = V4L2_STD_UNKNOWN,
1136 err = video_register_device(vdev, VFL_TYPE_GRABBER, vdev->minor);
1138 dev_err(vdev->parent, "video_register_device failed\n");
1146 video_device_release(vdev);
1150 EXPORT_SYMBOL(soc_camera_video_start);
1152 void soc_camera_video_stop(struct soc_camera_device *icd)
1154 struct video_device *vdev = icd->vdev;
1156 dev_dbg(&icd->dev, "%s\n", __func__);
1158 if (!icd->dev.parent || !vdev)
1161 mutex_lock(&icd->video_lock);
1162 video_unregister_device(vdev);
1164 mutex_unlock(&icd->video_lock);
1166 EXPORT_SYMBOL(soc_camera_video_stop);
1168 static int __init soc_camera_init(void)
1170 int ret = bus_register(&soc_camera_bus_type);
1173 ret = driver_register(&ic_drv);
1180 bus_unregister(&soc_camera_bus_type);
1184 static void __exit soc_camera_exit(void)
1186 driver_unregister(&ic_drv);
1187 bus_unregister(&soc_camera_bus_type);
1190 module_init(soc_camera_init);
1191 module_exit(soc_camera_exit);
1193 MODULE_DESCRIPTION("Image capture bus driver");
1194 MODULE_AUTHOR("Guennadi Liakhovetski <kernel@pengutronix.de>");
1195 MODULE_LICENSE("GPL");