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;
290 icd->field = pix->field;
292 if (f->type != V4L2_BUF_TYPE_VIDEO_CAPTURE)
293 dev_warn(&icd->dev, "Attention! Wrong buf-type %d\n",
296 dev_dbg(&icd->dev, "set width: %d height: %d\n",
297 icd->width, icd->height);
299 /* set physical bus parameters */
300 return ici->ops->set_bus_param(icd, pix->pixelformat);
303 static int soc_camera_open(struct file *file)
305 struct video_device *vdev;
306 struct soc_camera_device *icd;
307 struct soc_camera_host *ici;
308 struct soc_camera_file *icf;
311 icf = vmalloc(sizeof(*icf));
316 * It is safe to dereference these pointers now as long as a user has
317 * the video device open - we are protected by the held cdev reference.
320 vdev = video_devdata(file);
321 icd = container_of(vdev->parent, struct soc_camera_device, dev);
322 ici = to_soc_camera_host(icd->dev.parent);
324 if (!try_module_get(icd->ops->owner)) {
325 dev_err(&icd->dev, "Couldn't lock sensor driver.\n");
330 if (!try_module_get(ici->ops->owner)) {
331 dev_err(&icd->dev, "Couldn't lock capture bus driver.\n");
336 /* Protect against icd->remove() until we module_get() both drivers. */
337 mutex_lock(&icd->video_lock);
342 /* Now we really have to activate the camera */
343 if (icd->use_count == 1) {
344 /* Restore parameters before the last close() per V4L2 API */
345 struct v4l2_format f = {
346 .type = V4L2_BUF_TYPE_VIDEO_CAPTURE,
349 .height = icd->height,
351 .pixelformat = icd->current_fmt->fourcc,
352 .colorspace = icd->current_fmt->colorspace,
356 ret = ici->ops->add(icd);
358 dev_err(&icd->dev, "Couldn't activate the camera: %d\n", ret);
362 /* Try to configure with default parameters */
363 ret = soc_camera_set_fmt(icf, &f);
368 mutex_unlock(&icd->video_lock);
370 file->private_data = icf;
371 dev_dbg(&icd->dev, "camera device open\n");
373 ici->ops->init_videobuf(&icf->vb_vidq, icd);
378 * First three errors are entered with the .video_lock held
382 ici->ops->remove(icd);
385 mutex_unlock(&icd->video_lock);
386 module_put(ici->ops->owner);
388 module_put(icd->ops->owner);
394 static int soc_camera_close(struct file *file)
396 struct soc_camera_file *icf = file->private_data;
397 struct soc_camera_device *icd = icf->icd;
398 struct soc_camera_host *ici = to_soc_camera_host(icd->dev.parent);
399 struct video_device *vdev = icd->vdev;
401 mutex_lock(&icd->video_lock);
404 ici->ops->remove(icd);
406 mutex_unlock(&icd->video_lock);
408 module_put(icd->ops->owner);
409 module_put(ici->ops->owner);
413 dev_dbg(vdev->parent, "camera device close\n");
418 static ssize_t soc_camera_read(struct file *file, char __user *buf,
419 size_t count, loff_t *ppos)
421 struct soc_camera_file *icf = file->private_data;
422 struct soc_camera_device *icd = icf->icd;
423 struct video_device *vdev = icd->vdev;
426 dev_err(vdev->parent, "camera device read not implemented\n");
431 static int soc_camera_mmap(struct file *file, struct vm_area_struct *vma)
433 struct soc_camera_file *icf = file->private_data;
434 struct soc_camera_device *icd = icf->icd;
437 dev_dbg(&icd->dev, "mmap called, vma=0x%08lx\n", (unsigned long)vma);
439 err = videobuf_mmap_mapper(&icf->vb_vidq, vma);
441 dev_dbg(&icd->dev, "vma start=0x%08lx, size=%ld, ret=%d\n",
442 (unsigned long)vma->vm_start,
443 (unsigned long)vma->vm_end - (unsigned long)vma->vm_start,
449 static unsigned int soc_camera_poll(struct file *file, poll_table *pt)
451 struct soc_camera_file *icf = file->private_data;
452 struct soc_camera_device *icd = icf->icd;
453 struct soc_camera_host *ici = to_soc_camera_host(icd->dev.parent);
455 if (list_empty(&icf->vb_vidq.stream)) {
456 dev_err(&icd->dev, "Trying to poll with no queued buffers!\n");
460 return ici->ops->poll(file, pt);
463 static struct v4l2_file_operations soc_camera_fops = {
464 .owner = THIS_MODULE,
465 .open = soc_camera_open,
466 .release = soc_camera_close,
467 .ioctl = video_ioctl2,
468 .read = soc_camera_read,
469 .mmap = soc_camera_mmap,
470 .poll = soc_camera_poll,
473 static int soc_camera_s_fmt_vid_cap(struct file *file, void *priv,
474 struct v4l2_format *f)
476 struct soc_camera_file *icf = file->private_data;
477 struct soc_camera_device *icd = icf->icd;
480 WARN_ON(priv != file->private_data);
482 mutex_lock(&icf->vb_vidq.vb_lock);
484 if (videobuf_queue_is_busy(&icf->vb_vidq)) {
485 dev_err(&icd->dev, "S_FMT denied: queue busy\n");
490 ret = soc_camera_set_fmt(icf, f);
493 mutex_unlock(&icf->vb_vidq.vb_lock);
498 static int soc_camera_enum_fmt_vid_cap(struct file *file, void *priv,
499 struct v4l2_fmtdesc *f)
501 struct soc_camera_file *icf = file->private_data;
502 struct soc_camera_device *icd = icf->icd;
503 const struct soc_camera_data_format *format;
505 WARN_ON(priv != file->private_data);
507 if (f->index >= icd->num_user_formats)
510 format = icd->user_formats[f->index].host_fmt;
512 strlcpy(f->description, format->name, sizeof(f->description));
513 f->pixelformat = format->fourcc;
517 static int soc_camera_g_fmt_vid_cap(struct file *file, void *priv,
518 struct v4l2_format *f)
520 struct soc_camera_file *icf = file->private_data;
521 struct soc_camera_device *icd = icf->icd;
522 struct v4l2_pix_format *pix = &f->fmt.pix;
524 WARN_ON(priv != file->private_data);
526 pix->width = icd->width;
527 pix->height = icd->height;
528 pix->field = icf->vb_vidq.field;
529 pix->pixelformat = icd->current_fmt->fourcc;
530 pix->bytesperline = pix->width *
531 DIV_ROUND_UP(icd->current_fmt->depth, 8);
532 pix->sizeimage = pix->height * pix->bytesperline;
533 dev_dbg(&icd->dev, "current_fmt->fourcc: 0x%08x\n",
534 icd->current_fmt->fourcc);
538 static int soc_camera_querycap(struct file *file, void *priv,
539 struct v4l2_capability *cap)
541 struct soc_camera_file *icf = file->private_data;
542 struct soc_camera_device *icd = icf->icd;
543 struct soc_camera_host *ici = to_soc_camera_host(icd->dev.parent);
545 WARN_ON(priv != file->private_data);
547 strlcpy(cap->driver, ici->drv_name, sizeof(cap->driver));
548 return ici->ops->querycap(ici, cap);
551 static int soc_camera_streamon(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;
558 WARN_ON(priv != file->private_data);
560 dev_dbg(&icd->dev, "%s\n", __func__);
562 if (i != V4L2_BUF_TYPE_VIDEO_CAPTURE)
565 mutex_lock(&icd->video_lock);
567 icd->ops->start_capture(icd);
569 /* This calls buf_queue from host driver's videobuf_queue_ops */
570 ret = videobuf_streamon(&icf->vb_vidq);
572 mutex_unlock(&icd->video_lock);
577 static int soc_camera_streamoff(struct file *file, void *priv,
578 enum v4l2_buf_type i)
580 struct soc_camera_file *icf = file->private_data;
581 struct soc_camera_device *icd = icf->icd;
583 WARN_ON(priv != file->private_data);
585 dev_dbg(&icd->dev, "%s\n", __func__);
587 if (i != V4L2_BUF_TYPE_VIDEO_CAPTURE)
590 mutex_lock(&icd->video_lock);
592 /* This calls buf_release from host driver's videobuf_queue_ops for all
593 * remaining buffers. When the last buffer is freed, stop capture */
594 videobuf_streamoff(&icf->vb_vidq);
596 icd->ops->stop_capture(icd);
598 mutex_unlock(&icd->video_lock);
603 static int soc_camera_queryctrl(struct file *file, void *priv,
604 struct v4l2_queryctrl *qc)
606 struct soc_camera_file *icf = file->private_data;
607 struct soc_camera_device *icd = icf->icd;
610 WARN_ON(priv != file->private_data);
615 for (i = 0; i < icd->ops->num_controls; i++)
616 if (qc->id == icd->ops->controls[i].id) {
617 memcpy(qc, &(icd->ops->controls[i]),
625 static int soc_camera_g_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);
635 if (icd->gain == (unsigned short)~0)
637 ctrl->value = icd->gain;
639 case V4L2_CID_EXPOSURE:
640 if (icd->exposure == (unsigned short)~0)
642 ctrl->value = icd->exposure;
646 if (icd->ops->get_control)
647 return icd->ops->get_control(icd, ctrl);
651 static int soc_camera_s_ctrl(struct file *file, void *priv,
652 struct v4l2_control *ctrl)
654 struct soc_camera_file *icf = file->private_data;
655 struct soc_camera_device *icd = icf->icd;
657 WARN_ON(priv != file->private_data);
659 if (icd->ops->set_control)
660 return icd->ops->set_control(icd, ctrl);
664 static int soc_camera_cropcap(struct file *file, void *fh,
665 struct v4l2_cropcap *a)
667 struct soc_camera_file *icf = file->private_data;
668 struct soc_camera_device *icd = icf->icd;
670 a->type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
671 a->bounds.left = icd->x_min;
672 a->bounds.top = icd->y_min;
673 a->bounds.width = icd->width_max;
674 a->bounds.height = icd->height_max;
675 a->defrect.left = icd->x_min;
676 a->defrect.top = icd->y_min;
677 a->defrect.width = DEFAULT_WIDTH;
678 a->defrect.height = DEFAULT_HEIGHT;
679 a->pixelaspect.numerator = 1;
680 a->pixelaspect.denominator = 1;
685 static int soc_camera_g_crop(struct file *file, void *fh,
688 struct soc_camera_file *icf = file->private_data;
689 struct soc_camera_device *icd = icf->icd;
691 a->type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
692 a->c.left = icd->x_current;
693 a->c.top = icd->y_current;
694 a->c.width = icd->width;
695 a->c.height = icd->height;
700 static int soc_camera_s_crop(struct file *file, void *fh,
703 struct soc_camera_file *icf = file->private_data;
704 struct soc_camera_device *icd = icf->icd;
705 struct soc_camera_host *ici = to_soc_camera_host(icd->dev.parent);
708 if (a->type != V4L2_BUF_TYPE_VIDEO_CAPTURE)
711 /* Cropping is allowed during a running capture, guard consistency */
712 mutex_lock(&icf->vb_vidq.vb_lock);
714 ret = ici->ops->set_crop(icd, &a->c);
716 icd->width = a->c.width;
717 icd->height = a->c.height;
718 icd->x_current = a->c.left;
719 icd->y_current = a->c.top;
722 mutex_unlock(&icf->vb_vidq.vb_lock);
727 static int soc_camera_g_chip_ident(struct file *file, void *fh,
728 struct v4l2_dbg_chip_ident *id)
730 struct soc_camera_file *icf = file->private_data;
731 struct soc_camera_device *icd = icf->icd;
733 if (!icd->ops->get_chip_id)
736 return icd->ops->get_chip_id(icd, id);
739 #ifdef CONFIG_VIDEO_ADV_DEBUG
740 static int soc_camera_g_register(struct file *file, void *fh,
741 struct v4l2_dbg_register *reg)
743 struct soc_camera_file *icf = file->private_data;
744 struct soc_camera_device *icd = icf->icd;
746 if (!icd->ops->get_register)
749 return icd->ops->get_register(icd, reg);
752 static int soc_camera_s_register(struct file *file, void *fh,
753 struct v4l2_dbg_register *reg)
755 struct soc_camera_file *icf = file->private_data;
756 struct soc_camera_device *icd = icf->icd;
758 if (!icd->ops->set_register)
761 return icd->ops->set_register(icd, reg);
765 static int device_register_link(struct soc_camera_device *icd)
767 int ret = device_register(&icd->dev);
770 /* Prevent calling device_unregister() */
771 icd->dev.parent = NULL;
772 dev_err(&icd->dev, "Cannot register device: %d\n", ret);
773 /* Even if probe() was unsuccessful for all registered drivers,
774 * device_register() returns 0, and we add the link, just to
775 * document this camera's control device */
776 } else if (icd->control)
777 /* Have to sysfs_remove_link() before device_unregister()? */
778 if (sysfs_create_link(&icd->dev.kobj, &icd->control->kobj,
781 "Failed creating the control symlink\n");
785 /* So far this function cannot fail */
786 static void scan_add_host(struct soc_camera_host *ici)
788 struct soc_camera_device *icd;
790 mutex_lock(&list_lock);
792 list_for_each_entry(icd, &devices, list) {
793 if (icd->iface == ici->nr) {
794 icd->dev.parent = &ici->dev;
795 device_register_link(icd);
799 mutex_unlock(&list_lock);
802 /* return: 0 if no match found or a match found and
803 * device_register() successful, error code otherwise */
804 static int scan_add_device(struct soc_camera_device *icd)
806 struct soc_camera_host *ici;
809 mutex_lock(&list_lock);
811 list_add_tail(&icd->list, &devices);
813 /* Watch out for class_for_each_device / class_find_device API by
814 * Dave Young <hidave.darkstar@gmail.com> */
815 list_for_each_entry(ici, &hosts, list) {
816 if (icd->iface == ici->nr) {
818 icd->dev.parent = &ici->dev;
823 mutex_unlock(&list_lock);
826 ret = device_register_link(icd);
831 static int soc_camera_probe(struct device *dev)
833 struct soc_camera_device *icd = to_soc_camera_dev(dev);
834 struct soc_camera_host *ici = to_soc_camera_host(icd->dev.parent);
838 * Possible race scenario:
839 * modprobe <camera-host-driver> triggers __func__
840 * at this moment respective <camera-sensor-driver> gets rmmod'ed
841 * to protect take module references.
844 if (!try_module_get(icd->ops->owner)) {
845 dev_err(&icd->dev, "Couldn't lock sensor driver.\n");
850 if (!try_module_get(ici->ops->owner)) {
851 dev_err(&icd->dev, "Couldn't lock capture bus driver.\n");
856 mutex_lock(&icd->video_lock);
858 /* We only call ->add() here to activate and probe the camera.
859 * We shall ->remove() and deactivate it immediately afterwards. */
860 ret = ici->ops->add(icd);
864 ret = icd->ops->probe(icd);
866 const struct v4l2_queryctrl *qctrl;
868 qctrl = soc_camera_find_qctrl(icd->ops, V4L2_CID_GAIN);
869 icd->gain = qctrl ? qctrl->default_value : (unsigned short)~0;
870 qctrl = soc_camera_find_qctrl(icd->ops, V4L2_CID_EXPOSURE);
871 icd->exposure = qctrl ? qctrl->default_value :
874 ret = soc_camera_init_user_formats(icd);
878 icd->height = DEFAULT_HEIGHT;
879 icd->width = DEFAULT_WIDTH;
880 icd->field = V4L2_FIELD_ANY;
884 ici->ops->remove(icd);
886 mutex_unlock(&icd->video_lock);
887 module_put(ici->ops->owner);
889 module_put(icd->ops->owner);
894 /* This is called on device_unregister, which only means we have to disconnect
895 * from the host, but not remove ourselves from the device list */
896 static int soc_camera_remove(struct device *dev)
898 struct soc_camera_device *icd = to_soc_camera_dev(dev);
900 if (icd->ops->remove)
901 icd->ops->remove(icd);
903 soc_camera_free_user_formats(icd);
908 static int soc_camera_suspend(struct device *dev, pm_message_t state)
910 struct soc_camera_device *icd = to_soc_camera_dev(dev);
911 struct soc_camera_host *ici = to_soc_camera_host(icd->dev.parent);
914 if (ici->ops->suspend)
915 ret = ici->ops->suspend(icd, state);
920 static int soc_camera_resume(struct device *dev)
922 struct soc_camera_device *icd = to_soc_camera_dev(dev);
923 struct soc_camera_host *ici = to_soc_camera_host(icd->dev.parent);
926 if (ici->ops->resume)
927 ret = ici->ops->resume(icd);
932 static struct bus_type soc_camera_bus_type = {
933 .name = "soc-camera",
934 .probe = soc_camera_probe,
935 .remove = soc_camera_remove,
936 .suspend = soc_camera_suspend,
937 .resume = soc_camera_resume,
940 static struct device_driver ic_drv = {
942 .bus = &soc_camera_bus_type,
943 .owner = THIS_MODULE,
946 static void dummy_release(struct device *dev)
950 int soc_camera_host_register(struct soc_camera_host *ici)
953 struct soc_camera_host *ix;
955 if (!ici || !ici->ops ||
956 !ici->ops->try_fmt ||
957 !ici->ops->set_fmt ||
958 !ici->ops->set_crop ||
959 !ici->ops->set_bus_param ||
960 !ici->ops->querycap ||
961 !ici->ops->init_videobuf ||
962 !ici->ops->reqbufs ||
968 /* Number might be equal to the platform device ID */
969 dev_set_name(&ici->dev, "camera_host%d", ici->nr);
971 mutex_lock(&list_lock);
972 list_for_each_entry(ix, &hosts, list) {
973 if (ix->nr == ici->nr) {
974 mutex_unlock(&list_lock);
979 list_add_tail(&ici->list, &hosts);
980 mutex_unlock(&list_lock);
982 ici->dev.release = dummy_release;
984 ret = device_register(&ici->dev);
994 mutex_lock(&list_lock);
995 list_del(&ici->list);
996 mutex_unlock(&list_lock);
1000 EXPORT_SYMBOL(soc_camera_host_register);
1002 /* Unregister all clients! */
1003 void soc_camera_host_unregister(struct soc_camera_host *ici)
1005 struct soc_camera_device *icd;
1007 mutex_lock(&list_lock);
1009 list_del(&ici->list);
1011 list_for_each_entry(icd, &devices, list) {
1012 if (icd->dev.parent == &ici->dev) {
1013 device_unregister(&icd->dev);
1014 /* Not before device_unregister(), .remove
1015 * needs parent to call ici->ops->remove() */
1016 icd->dev.parent = NULL;
1017 memset(&icd->dev.kobj, 0, sizeof(icd->dev.kobj));
1021 mutex_unlock(&list_lock);
1023 device_unregister(&ici->dev);
1025 EXPORT_SYMBOL(soc_camera_host_unregister);
1027 /* Image capture device */
1028 int soc_camera_device_register(struct soc_camera_device *icd)
1030 struct soc_camera_device *ix;
1033 if (!icd || !icd->ops ||
1036 !icd->ops->release ||
1037 !icd->ops->start_capture ||
1038 !icd->ops->stop_capture ||
1039 !icd->ops->set_crop ||
1040 !icd->ops->set_fmt ||
1041 !icd->ops->try_fmt ||
1042 !icd->ops->query_bus_param ||
1043 !icd->ops->set_bus_param)
1046 for (i = 0; i < 256 && num < 0; i++) {
1048 list_for_each_entry(ix, &devices, list) {
1049 if (ix->iface == icd->iface && ix->devnum == i) {
1057 /* ok, we have 256 cameras on this host...
1058 * man, stay reasonable... */
1062 icd->dev.bus = &soc_camera_bus_type;
1063 dev_set_name(&icd->dev, "%u-%u", icd->iface, icd->devnum);
1065 icd->dev.release = dummy_release;
1067 icd->host_priv = NULL;
1068 mutex_init(&icd->video_lock);
1070 return scan_add_device(icd);
1072 EXPORT_SYMBOL(soc_camera_device_register);
1074 void soc_camera_device_unregister(struct soc_camera_device *icd)
1076 mutex_lock(&list_lock);
1077 list_del(&icd->list);
1079 /* The bus->remove will be eventually called */
1080 if (icd->dev.parent)
1081 device_unregister(&icd->dev);
1082 mutex_unlock(&list_lock);
1084 EXPORT_SYMBOL(soc_camera_device_unregister);
1086 static const struct v4l2_ioctl_ops soc_camera_ioctl_ops = {
1087 .vidioc_querycap = soc_camera_querycap,
1088 .vidioc_g_fmt_vid_cap = soc_camera_g_fmt_vid_cap,
1089 .vidioc_enum_fmt_vid_cap = soc_camera_enum_fmt_vid_cap,
1090 .vidioc_s_fmt_vid_cap = soc_camera_s_fmt_vid_cap,
1091 .vidioc_enum_input = soc_camera_enum_input,
1092 .vidioc_g_input = soc_camera_g_input,
1093 .vidioc_s_input = soc_camera_s_input,
1094 .vidioc_s_std = soc_camera_s_std,
1095 .vidioc_reqbufs = soc_camera_reqbufs,
1096 .vidioc_try_fmt_vid_cap = soc_camera_try_fmt_vid_cap,
1097 .vidioc_querybuf = soc_camera_querybuf,
1098 .vidioc_qbuf = soc_camera_qbuf,
1099 .vidioc_dqbuf = soc_camera_dqbuf,
1100 .vidioc_streamon = soc_camera_streamon,
1101 .vidioc_streamoff = soc_camera_streamoff,
1102 .vidioc_queryctrl = soc_camera_queryctrl,
1103 .vidioc_g_ctrl = soc_camera_g_ctrl,
1104 .vidioc_s_ctrl = soc_camera_s_ctrl,
1105 .vidioc_cropcap = soc_camera_cropcap,
1106 .vidioc_g_crop = soc_camera_g_crop,
1107 .vidioc_s_crop = soc_camera_s_crop,
1108 .vidioc_g_chip_ident = soc_camera_g_chip_ident,
1109 #ifdef CONFIG_VIDEO_ADV_DEBUG
1110 .vidioc_g_register = soc_camera_g_register,
1111 .vidioc_s_register = soc_camera_s_register,
1116 * Usually called from the struct soc_camera_ops .probe() method, i.e., from
1117 * soc_camera_probe() above with .video_lock held
1119 int soc_camera_video_start(struct soc_camera_device *icd)
1121 struct soc_camera_host *ici = to_soc_camera_host(icd->dev.parent);
1123 struct video_device *vdev;
1125 if (!icd->dev.parent)
1128 vdev = video_device_alloc();
1131 dev_dbg(&ici->dev, "Allocated video_device %p\n", vdev);
1133 strlcpy(vdev->name, ici->drv_name, sizeof(vdev->name));
1135 vdev->parent = &icd->dev;
1136 vdev->current_norm = V4L2_STD_UNKNOWN;
1137 vdev->fops = &soc_camera_fops;
1138 vdev->ioctl_ops = &soc_camera_ioctl_ops;
1139 vdev->release = video_device_release;
1141 vdev->tvnorms = V4L2_STD_UNKNOWN,
1143 err = video_register_device(vdev, VFL_TYPE_GRABBER, vdev->minor);
1145 dev_err(vdev->parent, "video_register_device failed\n");
1153 video_device_release(vdev);
1157 EXPORT_SYMBOL(soc_camera_video_start);
1159 void soc_camera_video_stop(struct soc_camera_device *icd)
1161 struct video_device *vdev = icd->vdev;
1163 dev_dbg(&icd->dev, "%s\n", __func__);
1165 if (!icd->dev.parent || !vdev)
1168 mutex_lock(&icd->video_lock);
1169 video_unregister_device(vdev);
1171 mutex_unlock(&icd->video_lock);
1173 EXPORT_SYMBOL(soc_camera_video_stop);
1175 static int __init soc_camera_init(void)
1177 int ret = bus_register(&soc_camera_bus_type);
1180 ret = driver_register(&ic_drv);
1187 bus_unregister(&soc_camera_bus_type);
1191 static void __exit soc_camera_exit(void)
1193 driver_unregister(&ic_drv);
1194 bus_unregister(&soc_camera_bus_type);
1197 module_init(soc_camera_init);
1198 module_exit(soc_camera_exit);
1200 MODULE_DESCRIPTION("Image capture bus driver");
1201 MODULE_AUTHOR("Guennadi Liakhovetski <kernel@pengutronix.de>");
1202 MODULE_LICENSE("GPL");