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/device.h>
20 #include <linux/err.h>
21 #include <linux/i2c.h>
22 #include <linux/init.h>
23 #include <linux/list.h>
24 #include <linux/module.h>
25 #include <linux/mutex.h>
26 #include <linux/platform_device.h>
27 #include <linux/vmalloc.h>
29 #include <media/soc_camera.h>
30 #include <media/v4l2-common.h>
31 #include <media/v4l2-dev.h>
32 #include <media/v4l2-ioctl.h>
33 #include <media/videobuf-core.h>
35 /* Default to VGA resolution */
36 #define DEFAULT_WIDTH 640
37 #define DEFAULT_HEIGHT 480
39 static LIST_HEAD(hosts);
40 static LIST_HEAD(devices);
41 static DEFINE_MUTEX(list_lock);
43 const struct soc_camera_data_format *soc_camera_format_by_fourcc(
44 struct soc_camera_device *icd, unsigned int fourcc)
48 for (i = 0; i < icd->num_formats; i++)
49 if (icd->formats[i].fourcc == fourcc)
50 return icd->formats + i;
53 EXPORT_SYMBOL(soc_camera_format_by_fourcc);
55 const struct soc_camera_format_xlate *soc_camera_xlate_by_fourcc(
56 struct soc_camera_device *icd, unsigned int fourcc)
60 for (i = 0; i < icd->num_user_formats; i++)
61 if (icd->user_formats[i].host_fmt->fourcc == fourcc)
62 return icd->user_formats + i;
65 EXPORT_SYMBOL(soc_camera_xlate_by_fourcc);
68 * soc_camera_apply_sensor_flags() - apply platform SOCAM_SENSOR_INVERT_* flags
69 * @icl: camera platform parameters
70 * @flags: flags to be inverted according to platform configuration
71 * @return: resulting flags
73 unsigned long soc_camera_apply_sensor_flags(struct soc_camera_link *icl,
78 /* If only one of the two polarities is supported, switch to the opposite */
79 if (icl->flags & SOCAM_SENSOR_INVERT_HSYNC) {
80 f = flags & (SOCAM_HSYNC_ACTIVE_HIGH | SOCAM_HSYNC_ACTIVE_LOW);
81 if (f == SOCAM_HSYNC_ACTIVE_HIGH || f == SOCAM_HSYNC_ACTIVE_LOW)
82 flags ^= SOCAM_HSYNC_ACTIVE_HIGH | SOCAM_HSYNC_ACTIVE_LOW;
85 if (icl->flags & SOCAM_SENSOR_INVERT_VSYNC) {
86 f = flags & (SOCAM_VSYNC_ACTIVE_HIGH | SOCAM_VSYNC_ACTIVE_LOW);
87 if (f == SOCAM_VSYNC_ACTIVE_HIGH || f == SOCAM_VSYNC_ACTIVE_LOW)
88 flags ^= SOCAM_VSYNC_ACTIVE_HIGH | SOCAM_VSYNC_ACTIVE_LOW;
91 if (icl->flags & SOCAM_SENSOR_INVERT_PCLK) {
92 f = flags & (SOCAM_PCLK_SAMPLE_RISING | SOCAM_PCLK_SAMPLE_FALLING);
93 if (f == SOCAM_PCLK_SAMPLE_RISING || f == SOCAM_PCLK_SAMPLE_FALLING)
94 flags ^= SOCAM_PCLK_SAMPLE_RISING | SOCAM_PCLK_SAMPLE_FALLING;
99 EXPORT_SYMBOL(soc_camera_apply_sensor_flags);
101 static int soc_camera_try_fmt_vid_cap(struct file *file, void *priv,
102 struct v4l2_format *f)
104 struct soc_camera_file *icf = file->private_data;
105 struct soc_camera_device *icd = icf->icd;
106 struct soc_camera_host *ici = to_soc_camera_host(icd->dev.parent);
108 WARN_ON(priv != file->private_data);
110 /* limit format to hardware capabilities */
111 return ici->ops->try_fmt(icd, f);
114 static int soc_camera_enum_input(struct file *file, void *priv,
115 struct v4l2_input *inp)
117 struct soc_camera_file *icf = file->private_data;
118 struct soc_camera_device *icd = icf->icd;
124 if (icd->ops->enum_input)
125 ret = icd->ops->enum_input(icd, inp);
127 /* default is camera */
128 inp->type = V4L2_INPUT_TYPE_CAMERA;
129 inp->std = V4L2_STD_UNKNOWN;
130 strcpy(inp->name, "Camera");
136 static int soc_camera_g_input(struct file *file, void *priv, unsigned int *i)
143 static int soc_camera_s_input(struct file *file, void *priv, unsigned int i)
151 static int soc_camera_s_std(struct file *file, void *priv, v4l2_std_id *a)
153 struct soc_camera_file *icf = file->private_data;
154 struct soc_camera_device *icd = icf->icd;
157 if (icd->ops->set_std)
158 ret = icd->ops->set_std(icd, a);
163 static int soc_camera_reqbufs(struct file *file, void *priv,
164 struct v4l2_requestbuffers *p)
167 struct soc_camera_file *icf = file->private_data;
168 struct soc_camera_device *icd = icf->icd;
169 struct soc_camera_host *ici = to_soc_camera_host(icd->dev.parent);
171 WARN_ON(priv != file->private_data);
173 dev_dbg(&icd->dev, "%s: %d\n", __func__, p->memory);
175 ret = videobuf_reqbufs(&icf->vb_vidq, p);
179 return ici->ops->reqbufs(icf, p);
182 static int soc_camera_querybuf(struct file *file, void *priv,
183 struct v4l2_buffer *p)
185 struct soc_camera_file *icf = file->private_data;
187 WARN_ON(priv != file->private_data);
189 return videobuf_querybuf(&icf->vb_vidq, p);
192 static int soc_camera_qbuf(struct file *file, void *priv,
193 struct v4l2_buffer *p)
195 struct soc_camera_file *icf = file->private_data;
197 WARN_ON(priv != file->private_data);
199 return videobuf_qbuf(&icf->vb_vidq, p);
202 static int soc_camera_dqbuf(struct file *file, void *priv,
203 struct v4l2_buffer *p)
205 struct soc_camera_file *icf = file->private_data;
207 WARN_ON(priv != file->private_data);
209 return videobuf_dqbuf(&icf->vb_vidq, p, file->f_flags & O_NONBLOCK);
212 static int soc_camera_init_user_formats(struct soc_camera_device *icd)
214 struct soc_camera_host *ici = to_soc_camera_host(icd->dev.parent);
217 if (!ici->ops->get_formats)
219 * Fallback mode - the host will have to serve all
220 * sensor-provided formats one-to-one to the user
222 fmts = icd->num_formats;
225 * First pass - only count formats this host-sensor
226 * configuration can provide
228 for (i = 0; i < icd->num_formats; i++)
229 fmts += ici->ops->get_formats(icd, i, NULL);
235 vmalloc(fmts * sizeof(struct soc_camera_format_xlate));
236 if (!icd->user_formats)
239 icd->num_user_formats = fmts;
242 dev_dbg(&icd->dev, "Found %d supported formats.\n", fmts);
244 /* Second pass - actually fill data formats */
245 for (i = 0; i < icd->num_formats; i++)
246 if (!ici->ops->get_formats) {
247 icd->user_formats[i].host_fmt = icd->formats + i;
248 icd->user_formats[i].cam_fmt = icd->formats + i;
249 icd->user_formats[i].buswidth = icd->formats[i].depth;
251 fmts += ici->ops->get_formats(icd, i,
252 &icd->user_formats[fmts]);
255 icd->current_fmt = icd->user_formats[0].host_fmt;
260 static void soc_camera_free_user_formats(struct soc_camera_device *icd)
262 vfree(icd->user_formats);
265 /* Called with .vb_lock held */
266 static int soc_camera_set_fmt(struct soc_camera_file *icf,
267 struct v4l2_format *f)
269 struct soc_camera_device *icd = icf->icd;
270 struct soc_camera_host *ici = to_soc_camera_host(icd->dev.parent);
271 struct v4l2_pix_format *pix = &f->fmt.pix;
274 /* We always call try_fmt() before set_fmt() or set_crop() */
275 ret = ici->ops->try_fmt(icd, f);
279 ret = ici->ops->set_fmt(icd, f);
282 } else if (!icd->current_fmt ||
283 icd->current_fmt->fourcc != pix->pixelformat) {
285 "Host driver hasn't set up current format correctly!\n");
289 icd->width = pix->width;
290 icd->height = pix->height;
292 icd->field = pix->field;
294 if (f->type != V4L2_BUF_TYPE_VIDEO_CAPTURE)
295 dev_warn(&icd->dev, "Attention! Wrong buf-type %d\n",
298 dev_dbg(&icd->dev, "set width: %d height: %d\n",
299 icd->width, icd->height);
301 /* set physical bus parameters */
302 return ici->ops->set_bus_param(icd, pix->pixelformat);
305 static int soc_camera_open(struct file *file)
307 struct video_device *vdev;
308 struct soc_camera_device *icd;
309 struct soc_camera_host *ici;
310 struct soc_camera_file *icf;
313 icf = vmalloc(sizeof(*icf));
318 * It is safe to dereference these pointers now as long as a user has
319 * the video device open - we are protected by the held cdev reference.
322 vdev = video_devdata(file);
323 icd = container_of(vdev->parent, struct soc_camera_device, dev);
324 ici = to_soc_camera_host(icd->dev.parent);
326 if (!try_module_get(icd->ops->owner)) {
327 dev_err(&icd->dev, "Couldn't lock sensor driver.\n");
332 if (!try_module_get(ici->ops->owner)) {
333 dev_err(&icd->dev, "Couldn't lock capture bus driver.\n");
338 /* Protect against icd->remove() until we module_get() both drivers. */
339 mutex_lock(&icd->video_lock);
344 /* Now we really have to activate the camera */
345 if (icd->use_count == 1) {
346 /* Restore parameters before the last close() per V4L2 API */
347 struct v4l2_format f = {
348 .type = V4L2_BUF_TYPE_VIDEO_CAPTURE,
351 .height = icd->height,
353 .pixelformat = icd->current_fmt->fourcc,
354 .colorspace = icd->current_fmt->colorspace,
358 ret = ici->ops->add(icd);
360 dev_err(&icd->dev, "Couldn't activate the camera: %d\n", ret);
364 /* Try to configure with default parameters */
365 ret = soc_camera_set_fmt(icf, &f);
370 mutex_unlock(&icd->video_lock);
372 file->private_data = icf;
373 dev_dbg(&icd->dev, "camera device open\n");
375 ici->ops->init_videobuf(&icf->vb_vidq, icd);
380 * First three errors are entered with the .video_lock held
384 ici->ops->remove(icd);
387 mutex_unlock(&icd->video_lock);
388 module_put(ici->ops->owner);
390 module_put(icd->ops->owner);
396 static int soc_camera_close(struct file *file)
398 struct soc_camera_file *icf = file->private_data;
399 struct soc_camera_device *icd = icf->icd;
400 struct soc_camera_host *ici = to_soc_camera_host(icd->dev.parent);
401 struct video_device *vdev = icd->vdev;
403 mutex_lock(&icd->video_lock);
406 ici->ops->remove(icd);
408 mutex_unlock(&icd->video_lock);
410 module_put(icd->ops->owner);
411 module_put(ici->ops->owner);
415 dev_dbg(vdev->parent, "camera device close\n");
420 static ssize_t soc_camera_read(struct file *file, char __user *buf,
421 size_t count, loff_t *ppos)
423 struct soc_camera_file *icf = file->private_data;
424 struct soc_camera_device *icd = icf->icd;
425 struct video_device *vdev = icd->vdev;
428 dev_err(vdev->parent, "camera device read not implemented\n");
433 static int soc_camera_mmap(struct file *file, struct vm_area_struct *vma)
435 struct soc_camera_file *icf = file->private_data;
436 struct soc_camera_device *icd = icf->icd;
439 dev_dbg(&icd->dev, "mmap called, vma=0x%08lx\n", (unsigned long)vma);
441 err = videobuf_mmap_mapper(&icf->vb_vidq, vma);
443 dev_dbg(&icd->dev, "vma start=0x%08lx, size=%ld, ret=%d\n",
444 (unsigned long)vma->vm_start,
445 (unsigned long)vma->vm_end - (unsigned long)vma->vm_start,
451 static unsigned int soc_camera_poll(struct file *file, poll_table *pt)
453 struct soc_camera_file *icf = file->private_data;
454 struct soc_camera_device *icd = icf->icd;
455 struct soc_camera_host *ici = to_soc_camera_host(icd->dev.parent);
457 if (list_empty(&icf->vb_vidq.stream)) {
458 dev_err(&icd->dev, "Trying to poll with no queued buffers!\n");
462 return ici->ops->poll(file, pt);
465 static struct v4l2_file_operations soc_camera_fops = {
466 .owner = THIS_MODULE,
467 .open = soc_camera_open,
468 .release = soc_camera_close,
469 .ioctl = video_ioctl2,
470 .read = soc_camera_read,
471 .mmap = soc_camera_mmap,
472 .poll = soc_camera_poll,
475 static int soc_camera_s_fmt_vid_cap(struct file *file, void *priv,
476 struct v4l2_format *f)
478 struct soc_camera_file *icf = file->private_data;
479 struct soc_camera_device *icd = icf->icd;
482 WARN_ON(priv != file->private_data);
484 mutex_lock(&icf->vb_vidq.vb_lock);
486 if (videobuf_queue_is_busy(&icf->vb_vidq)) {
487 dev_err(&icd->dev, "S_FMT denied: queue busy\n");
492 ret = soc_camera_set_fmt(icf, f);
495 mutex_unlock(&icf->vb_vidq.vb_lock);
500 static int soc_camera_enum_fmt_vid_cap(struct file *file, void *priv,
501 struct v4l2_fmtdesc *f)
503 struct soc_camera_file *icf = file->private_data;
504 struct soc_camera_device *icd = icf->icd;
505 const struct soc_camera_data_format *format;
507 WARN_ON(priv != file->private_data);
509 if (f->index >= icd->num_user_formats)
512 format = icd->user_formats[f->index].host_fmt;
514 strlcpy(f->description, format->name, sizeof(f->description));
515 f->pixelformat = format->fourcc;
519 static int soc_camera_g_fmt_vid_cap(struct file *file, void *priv,
520 struct v4l2_format *f)
522 struct soc_camera_file *icf = file->private_data;
523 struct soc_camera_device *icd = icf->icd;
524 struct v4l2_pix_format *pix = &f->fmt.pix;
526 WARN_ON(priv != file->private_data);
528 pix->width = icd->width;
529 pix->height = icd->height;
530 pix->field = icf->vb_vidq.field;
531 pix->pixelformat = icd->current_fmt->fourcc;
532 pix->bytesperline = pix->width *
533 DIV_ROUND_UP(icd->current_fmt->depth, 8);
534 pix->sizeimage = pix->height * pix->bytesperline;
535 dev_dbg(&icd->dev, "current_fmt->fourcc: 0x%08x\n",
536 icd->current_fmt->fourcc);
540 static int soc_camera_querycap(struct file *file, void *priv,
541 struct v4l2_capability *cap)
543 struct soc_camera_file *icf = file->private_data;
544 struct soc_camera_device *icd = icf->icd;
545 struct soc_camera_host *ici = to_soc_camera_host(icd->dev.parent);
547 WARN_ON(priv != file->private_data);
549 strlcpy(cap->driver, ici->drv_name, sizeof(cap->driver));
550 return ici->ops->querycap(ici, cap);
553 static int soc_camera_streamon(struct file *file, void *priv,
554 enum v4l2_buf_type i)
556 struct soc_camera_file *icf = file->private_data;
557 struct soc_camera_device *icd = icf->icd;
560 WARN_ON(priv != file->private_data);
562 dev_dbg(&icd->dev, "%s\n", __func__);
564 if (i != V4L2_BUF_TYPE_VIDEO_CAPTURE)
567 mutex_lock(&icd->video_lock);
569 icd->ops->start_capture(icd);
571 /* This calls buf_queue from host driver's videobuf_queue_ops */
572 ret = videobuf_streamon(&icf->vb_vidq);
574 mutex_unlock(&icd->video_lock);
579 static int soc_camera_streamoff(struct file *file, void *priv,
580 enum v4l2_buf_type i)
582 struct soc_camera_file *icf = file->private_data;
583 struct soc_camera_device *icd = icf->icd;
585 WARN_ON(priv != file->private_data);
587 dev_dbg(&icd->dev, "%s\n", __func__);
589 if (i != V4L2_BUF_TYPE_VIDEO_CAPTURE)
592 mutex_lock(&icd->video_lock);
594 /* This calls buf_release from host driver's videobuf_queue_ops for all
595 * remaining buffers. When the last buffer is freed, stop capture */
596 videobuf_streamoff(&icf->vb_vidq);
598 icd->ops->stop_capture(icd);
600 mutex_unlock(&icd->video_lock);
605 static int soc_camera_queryctrl(struct file *file, void *priv,
606 struct v4l2_queryctrl *qc)
608 struct soc_camera_file *icf = file->private_data;
609 struct soc_camera_device *icd = icf->icd;
612 WARN_ON(priv != file->private_data);
617 for (i = 0; i < icd->ops->num_controls; i++)
618 if (qc->id == icd->ops->controls[i].id) {
619 memcpy(qc, &(icd->ops->controls[i]),
627 static int soc_camera_g_ctrl(struct file *file, void *priv,
628 struct v4l2_control *ctrl)
630 struct soc_camera_file *icf = file->private_data;
631 struct soc_camera_device *icd = icf->icd;
633 WARN_ON(priv != file->private_data);
637 if (icd->gain == (unsigned short)~0)
639 ctrl->value = icd->gain;
641 case V4L2_CID_EXPOSURE:
642 if (icd->exposure == (unsigned short)~0)
644 ctrl->value = icd->exposure;
648 if (icd->ops->get_control)
649 return icd->ops->get_control(icd, ctrl);
653 static int soc_camera_s_ctrl(struct file *file, void *priv,
654 struct v4l2_control *ctrl)
656 struct soc_camera_file *icf = file->private_data;
657 struct soc_camera_device *icd = icf->icd;
659 WARN_ON(priv != file->private_data);
661 if (icd->ops->set_control)
662 return icd->ops->set_control(icd, ctrl);
666 static int soc_camera_cropcap(struct file *file, void *fh,
667 struct v4l2_cropcap *a)
669 struct soc_camera_file *icf = file->private_data;
670 struct soc_camera_device *icd = icf->icd;
672 a->type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
673 a->bounds.left = icd->x_min;
674 a->bounds.top = icd->y_min;
675 a->bounds.width = icd->width_max;
676 a->bounds.height = icd->height_max;
677 a->defrect.left = icd->x_min;
678 a->defrect.top = icd->y_min;
679 a->defrect.width = DEFAULT_WIDTH;
680 a->defrect.height = DEFAULT_HEIGHT;
681 a->pixelaspect.numerator = 1;
682 a->pixelaspect.denominator = 1;
687 static int soc_camera_g_crop(struct file *file, void *fh,
690 struct soc_camera_file *icf = file->private_data;
691 struct soc_camera_device *icd = icf->icd;
693 a->type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
694 a->c.left = icd->x_current;
695 a->c.top = icd->y_current;
696 a->c.width = icd->width;
697 a->c.height = icd->height;
702 static int soc_camera_s_crop(struct file *file, void *fh,
705 struct soc_camera_file *icf = file->private_data;
706 struct soc_camera_device *icd = icf->icd;
707 struct soc_camera_host *ici = to_soc_camera_host(icd->dev.parent);
710 if (a->type != V4L2_BUF_TYPE_VIDEO_CAPTURE)
713 /* Cropping is allowed during a running capture, guard consistency */
714 mutex_lock(&icf->vb_vidq.vb_lock);
716 ret = ici->ops->set_crop(icd, &a->c);
718 icd->width = a->c.width;
719 icd->height = a->c.height;
720 icd->x_current = a->c.left;
721 icd->y_current = a->c.top;
724 mutex_unlock(&icf->vb_vidq.vb_lock);
729 static int soc_camera_g_chip_ident(struct file *file, void *fh,
730 struct v4l2_dbg_chip_ident *id)
732 struct soc_camera_file *icf = file->private_data;
733 struct soc_camera_device *icd = icf->icd;
735 if (!icd->ops->get_chip_id)
738 return icd->ops->get_chip_id(icd, id);
741 #ifdef CONFIG_VIDEO_ADV_DEBUG
742 static int soc_camera_g_register(struct file *file, void *fh,
743 struct v4l2_dbg_register *reg)
745 struct soc_camera_file *icf = file->private_data;
746 struct soc_camera_device *icd = icf->icd;
748 if (!icd->ops->get_register)
751 return icd->ops->get_register(icd, reg);
754 static int soc_camera_s_register(struct file *file, void *fh,
755 struct v4l2_dbg_register *reg)
757 struct soc_camera_file *icf = file->private_data;
758 struct soc_camera_device *icd = icf->icd;
760 if (!icd->ops->set_register)
763 return icd->ops->set_register(icd, reg);
767 static int device_register_link(struct soc_camera_device *icd)
769 int ret = dev_set_name(&icd->dev, "%u-%u", icd->iface, icd->devnum);
772 ret = device_register(&icd->dev);
775 /* Prevent calling device_unregister() */
776 icd->dev.parent = NULL;
777 dev_err(&icd->dev, "Cannot register device: %d\n", ret);
778 /* Even if probe() was unsuccessful for all registered drivers,
779 * device_register() returns 0, and we add the link, just to
780 * document this camera's control device */
781 } else if (icd->control)
782 /* Have to sysfs_remove_link() before device_unregister()? */
783 if (sysfs_create_link(&icd->dev.kobj, &icd->control->kobj,
786 "Failed creating the control symlink\n");
790 /* So far this function cannot fail */
791 static void scan_add_host(struct soc_camera_host *ici)
793 struct soc_camera_device *icd;
795 mutex_lock(&list_lock);
797 list_for_each_entry(icd, &devices, list) {
798 if (icd->iface == ici->nr) {
799 icd->dev.parent = ici->dev;
800 device_register_link(icd);
804 mutex_unlock(&list_lock);
807 /* return: 0 if no match found or a match found and
808 * device_register() successful, error code otherwise */
809 static int scan_add_device(struct soc_camera_device *icd)
811 struct soc_camera_host *ici;
814 mutex_lock(&list_lock);
816 list_add_tail(&icd->list, &devices);
818 /* Watch out for class_for_each_device / class_find_device API by
819 * Dave Young <hidave.darkstar@gmail.com> */
820 list_for_each_entry(ici, &hosts, list) {
821 if (icd->iface == ici->nr) {
823 icd->dev.parent = ici->dev;
828 mutex_unlock(&list_lock);
831 ret = device_register_link(icd);
836 static int soc_camera_probe(struct device *dev)
838 struct soc_camera_device *icd = to_soc_camera_dev(dev);
839 struct soc_camera_host *ici = to_soc_camera_host(icd->dev.parent);
843 * Possible race scenario:
844 * modprobe <camera-host-driver> triggers __func__
845 * at this moment respective <camera-sensor-driver> gets rmmod'ed
846 * to protect take module references.
849 if (!try_module_get(icd->ops->owner)) {
850 dev_err(&icd->dev, "Couldn't lock sensor driver.\n");
855 if (!try_module_get(ici->ops->owner)) {
856 dev_err(&icd->dev, "Couldn't lock capture bus driver.\n");
861 mutex_lock(&icd->video_lock);
863 /* We only call ->add() here to activate and probe the camera.
864 * We shall ->remove() and deactivate it immediately afterwards. */
865 ret = ici->ops->add(icd);
869 ret = icd->ops->probe(icd);
871 const struct v4l2_queryctrl *qctrl;
873 qctrl = soc_camera_find_qctrl(icd->ops, V4L2_CID_GAIN);
874 icd->gain = qctrl ? qctrl->default_value : (unsigned short)~0;
875 qctrl = soc_camera_find_qctrl(icd->ops, V4L2_CID_EXPOSURE);
876 icd->exposure = qctrl ? qctrl->default_value :
879 ret = soc_camera_init_user_formats(icd);
883 icd->height = DEFAULT_HEIGHT;
884 icd->width = DEFAULT_WIDTH;
885 icd->field = V4L2_FIELD_ANY;
889 ici->ops->remove(icd);
891 mutex_unlock(&icd->video_lock);
892 module_put(ici->ops->owner);
894 module_put(icd->ops->owner);
899 /* This is called on device_unregister, which only means we have to disconnect
900 * from the host, but not remove ourselves from the device list */
901 static int soc_camera_remove(struct device *dev)
903 struct soc_camera_device *icd = to_soc_camera_dev(dev);
905 if (icd->ops->remove)
906 icd->ops->remove(icd);
908 soc_camera_free_user_formats(icd);
913 static int soc_camera_suspend(struct device *dev, pm_message_t state)
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->suspend)
920 ret = ici->ops->suspend(icd, state);
925 static int soc_camera_resume(struct device *dev)
927 struct soc_camera_device *icd = to_soc_camera_dev(dev);
928 struct soc_camera_host *ici = to_soc_camera_host(icd->dev.parent);
931 if (ici->ops->resume)
932 ret = ici->ops->resume(icd);
937 static struct bus_type soc_camera_bus_type = {
938 .name = "soc-camera",
939 .probe = soc_camera_probe,
940 .remove = soc_camera_remove,
941 .suspend = soc_camera_suspend,
942 .resume = soc_camera_resume,
945 static struct device_driver ic_drv = {
947 .bus = &soc_camera_bus_type,
948 .owner = THIS_MODULE,
951 static void dummy_release(struct device *dev)
955 int soc_camera_host_register(struct soc_camera_host *ici)
957 struct soc_camera_host *ix;
959 if (!ici || !ici->ops ||
960 !ici->ops->try_fmt ||
961 !ici->ops->set_fmt ||
962 !ici->ops->set_crop ||
963 !ici->ops->set_bus_param ||
964 !ici->ops->querycap ||
965 !ici->ops->init_videobuf ||
966 !ici->ops->reqbufs ||
973 mutex_lock(&list_lock);
974 list_for_each_entry(ix, &hosts, list) {
975 if (ix->nr == ici->nr) {
976 mutex_unlock(&list_lock);
981 dev_set_drvdata(ici->dev, ici);
983 list_add_tail(&ici->list, &hosts);
984 mutex_unlock(&list_lock);
990 EXPORT_SYMBOL(soc_camera_host_register);
992 /* Unregister all clients! */
993 void soc_camera_host_unregister(struct soc_camera_host *ici)
995 struct soc_camera_device *icd;
997 mutex_lock(&list_lock);
999 list_del(&ici->list);
1001 list_for_each_entry(icd, &devices, list) {
1002 if (icd->dev.parent == ici->dev) {
1003 device_unregister(&icd->dev);
1004 /* Not before device_unregister(), .remove
1005 * needs parent to call ici->ops->remove() */
1006 icd->dev.parent = NULL;
1007 memset(&icd->dev.kobj, 0, sizeof(icd->dev.kobj));
1011 mutex_unlock(&list_lock);
1013 dev_set_drvdata(ici->dev, NULL);
1015 EXPORT_SYMBOL(soc_camera_host_unregister);
1017 /* Image capture device */
1018 int soc_camera_device_register(struct soc_camera_device *icd)
1020 struct soc_camera_device *ix;
1023 if (!icd || !icd->ops ||
1026 !icd->ops->release ||
1027 !icd->ops->start_capture ||
1028 !icd->ops->stop_capture ||
1029 !icd->ops->set_crop ||
1030 !icd->ops->set_fmt ||
1031 !icd->ops->try_fmt ||
1032 !icd->ops->query_bus_param ||
1033 !icd->ops->set_bus_param)
1036 for (i = 0; i < 256 && num < 0; i++) {
1038 list_for_each_entry(ix, &devices, list) {
1039 if (ix->iface == icd->iface && ix->devnum == i) {
1047 /* ok, we have 256 cameras on this host...
1048 * man, stay reasonable... */
1052 icd->dev.bus = &soc_camera_bus_type;
1054 icd->dev.release = dummy_release;
1056 icd->host_priv = NULL;
1057 mutex_init(&icd->video_lock);
1059 return scan_add_device(icd);
1061 EXPORT_SYMBOL(soc_camera_device_register);
1063 void soc_camera_device_unregister(struct soc_camera_device *icd)
1065 mutex_lock(&list_lock);
1066 list_del(&icd->list);
1068 /* The bus->remove will be eventually called */
1069 if (icd->dev.parent)
1070 device_unregister(&icd->dev);
1071 mutex_unlock(&list_lock);
1073 EXPORT_SYMBOL(soc_camera_device_unregister);
1075 static const struct v4l2_ioctl_ops soc_camera_ioctl_ops = {
1076 .vidioc_querycap = soc_camera_querycap,
1077 .vidioc_g_fmt_vid_cap = soc_camera_g_fmt_vid_cap,
1078 .vidioc_enum_fmt_vid_cap = soc_camera_enum_fmt_vid_cap,
1079 .vidioc_s_fmt_vid_cap = soc_camera_s_fmt_vid_cap,
1080 .vidioc_enum_input = soc_camera_enum_input,
1081 .vidioc_g_input = soc_camera_g_input,
1082 .vidioc_s_input = soc_camera_s_input,
1083 .vidioc_s_std = soc_camera_s_std,
1084 .vidioc_reqbufs = soc_camera_reqbufs,
1085 .vidioc_try_fmt_vid_cap = soc_camera_try_fmt_vid_cap,
1086 .vidioc_querybuf = soc_camera_querybuf,
1087 .vidioc_qbuf = soc_camera_qbuf,
1088 .vidioc_dqbuf = soc_camera_dqbuf,
1089 .vidioc_streamon = soc_camera_streamon,
1090 .vidioc_streamoff = soc_camera_streamoff,
1091 .vidioc_queryctrl = soc_camera_queryctrl,
1092 .vidioc_g_ctrl = soc_camera_g_ctrl,
1093 .vidioc_s_ctrl = soc_camera_s_ctrl,
1094 .vidioc_cropcap = soc_camera_cropcap,
1095 .vidioc_g_crop = soc_camera_g_crop,
1096 .vidioc_s_crop = soc_camera_s_crop,
1097 .vidioc_g_chip_ident = soc_camera_g_chip_ident,
1098 #ifdef CONFIG_VIDEO_ADV_DEBUG
1099 .vidioc_g_register = soc_camera_g_register,
1100 .vidioc_s_register = soc_camera_s_register,
1105 * Usually called from the struct soc_camera_ops .probe() method, i.e., from
1106 * soc_camera_probe() above with .video_lock held
1108 int soc_camera_video_start(struct soc_camera_device *icd)
1110 struct soc_camera_host *ici = to_soc_camera_host(icd->dev.parent);
1112 struct video_device *vdev;
1114 if (!icd->dev.parent)
1117 vdev = video_device_alloc();
1120 dev_dbg(ici->dev, "Allocated video_device %p\n", vdev);
1122 strlcpy(vdev->name, ici->drv_name, sizeof(vdev->name));
1124 vdev->parent = &icd->dev;
1125 vdev->current_norm = V4L2_STD_UNKNOWN;
1126 vdev->fops = &soc_camera_fops;
1127 vdev->ioctl_ops = &soc_camera_ioctl_ops;
1128 vdev->release = video_device_release;
1130 vdev->tvnorms = V4L2_STD_UNKNOWN,
1132 err = video_register_device(vdev, VFL_TYPE_GRABBER, vdev->minor);
1134 dev_err(vdev->parent, "video_register_device failed\n");
1142 video_device_release(vdev);
1146 EXPORT_SYMBOL(soc_camera_video_start);
1148 void soc_camera_video_stop(struct soc_camera_device *icd)
1150 struct video_device *vdev = icd->vdev;
1152 dev_dbg(&icd->dev, "%s\n", __func__);
1154 if (!icd->dev.parent || !vdev)
1157 mutex_lock(&icd->video_lock);
1158 video_unregister_device(vdev);
1160 mutex_unlock(&icd->video_lock);
1162 EXPORT_SYMBOL(soc_camera_video_stop);
1164 static int __devinit soc_camera_pdrv_probe(struct platform_device *pdev)
1166 struct soc_camera_link *icl = pdev->dev.platform_data;
1167 struct i2c_adapter *adap;
1168 struct i2c_client *client;
1173 adap = i2c_get_adapter(icl->i2c_adapter_id);
1175 dev_warn(&pdev->dev, "Cannot get adapter #%d. No driver?\n",
1176 icl->i2c_adapter_id);
1177 /* -ENODEV and -ENXIO do not produce an error on probe()... */
1181 icl->board_info->platform_data = icl;
1182 client = i2c_new_device(adap, icl->board_info);
1184 i2c_put_adapter(adap);
1188 platform_set_drvdata(pdev, client);
1193 static int __devexit soc_camera_pdrv_remove(struct platform_device *pdev)
1195 struct i2c_client *client = platform_get_drvdata(pdev);
1200 i2c_unregister_device(client);
1201 i2c_put_adapter(client->adapter);
1206 static struct platform_driver __refdata soc_camera_pdrv = {
1207 .probe = soc_camera_pdrv_probe,
1208 .remove = __devexit_p(soc_camera_pdrv_remove),
1210 .name = "soc-camera-pdrv",
1211 .owner = THIS_MODULE,
1215 static int __init soc_camera_init(void)
1217 int ret = bus_register(&soc_camera_bus_type);
1220 ret = driver_register(&ic_drv);
1224 ret = platform_driver_register(&soc_camera_pdrv);
1231 driver_unregister(&ic_drv);
1233 bus_unregister(&soc_camera_bus_type);
1237 static void __exit soc_camera_exit(void)
1239 platform_driver_unregister(&soc_camera_pdrv);
1240 driver_unregister(&ic_drv);
1241 bus_unregister(&soc_camera_bus_type);
1244 module_init(soc_camera_init);
1245 module_exit(soc_camera_exit);
1247 MODULE_DESCRIPTION("Image capture bus driver");
1248 MODULE_AUTHOR("Guennadi Liakhovetski <kernel@pengutronix.de>");
1249 MODULE_LICENSE("GPL");
1250 MODULE_ALIAS("platform:soc-camera-pdrv");