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/mutex.h>
25 #include <linux/module.h>
26 #include <linux/platform_device.h>
27 #include <linux/slab.h>
28 #include <linux/pm_runtime.h>
29 #include <linux/vmalloc.h>
31 #include <media/soc_camera.h>
32 #include <media/v4l2-common.h>
33 #include <media/v4l2-ioctl.h>
34 #include <media/v4l2-dev.h>
35 #include <media/videobuf-core.h>
36 #include <media/soc_mediabus.h>
38 /* Default to VGA resolution */
39 #define DEFAULT_WIDTH 640
40 #define DEFAULT_HEIGHT 480
42 static LIST_HEAD(hosts);
43 static LIST_HEAD(devices);
44 static DEFINE_MUTEX(list_lock); /* Protects the list of hosts */
46 const struct soc_camera_format_xlate *soc_camera_xlate_by_fourcc(
47 struct soc_camera_device *icd, unsigned int fourcc)
51 for (i = 0; i < icd->num_user_formats; i++)
52 if (icd->user_formats[i].host_fmt->fourcc == fourcc)
53 return icd->user_formats + i;
56 EXPORT_SYMBOL(soc_camera_xlate_by_fourcc);
59 * soc_camera_apply_sensor_flags() - apply platform SOCAM_SENSOR_INVERT_* flags
60 * @icl: camera platform parameters
61 * @flags: flags to be inverted according to platform configuration
62 * @return: resulting flags
64 unsigned long soc_camera_apply_sensor_flags(struct soc_camera_link *icl,
69 /* If only one of the two polarities is supported, switch to the opposite */
70 if (icl->flags & SOCAM_SENSOR_INVERT_HSYNC) {
71 f = flags & (SOCAM_HSYNC_ACTIVE_HIGH | SOCAM_HSYNC_ACTIVE_LOW);
72 if (f == SOCAM_HSYNC_ACTIVE_HIGH || f == SOCAM_HSYNC_ACTIVE_LOW)
73 flags ^= SOCAM_HSYNC_ACTIVE_HIGH | SOCAM_HSYNC_ACTIVE_LOW;
76 if (icl->flags & SOCAM_SENSOR_INVERT_VSYNC) {
77 f = flags & (SOCAM_VSYNC_ACTIVE_HIGH | SOCAM_VSYNC_ACTIVE_LOW);
78 if (f == SOCAM_VSYNC_ACTIVE_HIGH || f == SOCAM_VSYNC_ACTIVE_LOW)
79 flags ^= SOCAM_VSYNC_ACTIVE_HIGH | SOCAM_VSYNC_ACTIVE_LOW;
82 if (icl->flags & SOCAM_SENSOR_INVERT_PCLK) {
83 f = flags & (SOCAM_PCLK_SAMPLE_RISING | SOCAM_PCLK_SAMPLE_FALLING);
84 if (f == SOCAM_PCLK_SAMPLE_RISING || f == SOCAM_PCLK_SAMPLE_FALLING)
85 flags ^= SOCAM_PCLK_SAMPLE_RISING | SOCAM_PCLK_SAMPLE_FALLING;
90 EXPORT_SYMBOL(soc_camera_apply_sensor_flags);
92 static int soc_camera_try_fmt_vid_cap(struct file *file, void *priv,
93 struct v4l2_format *f)
95 struct soc_camera_file *icf = file->private_data;
96 struct soc_camera_device *icd = icf->icd;
97 struct soc_camera_host *ici = to_soc_camera_host(icd->dev.parent);
99 WARN_ON(priv != file->private_data);
101 /* limit format to hardware capabilities */
102 return ici->ops->try_fmt(icd, f);
105 static int soc_camera_enum_input(struct file *file, void *priv,
106 struct v4l2_input *inp)
108 struct soc_camera_file *icf = file->private_data;
109 struct soc_camera_device *icd = icf->icd;
115 if (icd->ops->enum_input)
116 ret = icd->ops->enum_input(icd, inp);
118 /* default is camera */
119 inp->type = V4L2_INPUT_TYPE_CAMERA;
120 inp->std = V4L2_STD_UNKNOWN;
121 strcpy(inp->name, "Camera");
127 static int soc_camera_g_input(struct file *file, void *priv, unsigned int *i)
134 static int soc_camera_s_input(struct file *file, void *priv, unsigned int i)
142 static int soc_camera_s_std(struct file *file, void *priv, v4l2_std_id *a)
144 struct soc_camera_file *icf = file->private_data;
145 struct soc_camera_device *icd = icf->icd;
146 struct v4l2_subdev *sd = soc_camera_to_subdev(icd);
148 return v4l2_subdev_call(sd, core, s_std, *a);
151 static int soc_camera_reqbufs(struct file *file, void *priv,
152 struct v4l2_requestbuffers *p)
155 struct soc_camera_file *icf = file->private_data;
156 struct soc_camera_device *icd = icf->icd;
157 struct soc_camera_host *ici = to_soc_camera_host(icd->dev.parent);
159 WARN_ON(priv != file->private_data);
161 ret = videobuf_reqbufs(&icf->vb_vidq, p);
165 return ici->ops->reqbufs(icf, p);
168 static int soc_camera_querybuf(struct file *file, void *priv,
169 struct v4l2_buffer *p)
171 struct soc_camera_file *icf = file->private_data;
173 WARN_ON(priv != file->private_data);
175 return videobuf_querybuf(&icf->vb_vidq, p);
178 static int soc_camera_qbuf(struct file *file, void *priv,
179 struct v4l2_buffer *p)
181 struct soc_camera_file *icf = file->private_data;
183 WARN_ON(priv != file->private_data);
185 return videobuf_qbuf(&icf->vb_vidq, p);
188 static int soc_camera_dqbuf(struct file *file, void *priv,
189 struct v4l2_buffer *p)
191 struct soc_camera_file *icf = file->private_data;
193 WARN_ON(priv != file->private_data);
195 return videobuf_dqbuf(&icf->vb_vidq, p, file->f_flags & O_NONBLOCK);
198 /* Always entered with .video_lock held */
199 static int soc_camera_init_user_formats(struct soc_camera_device *icd)
201 struct v4l2_subdev *sd = soc_camera_to_subdev(icd);
202 struct soc_camera_host *ici = to_soc_camera_host(icd->dev.parent);
203 unsigned int i, fmts = 0, raw_fmts = 0;
205 enum v4l2_mbus_pixelcode code;
207 while (!v4l2_subdev_call(sd, video, enum_mbus_fmt, raw_fmts, &code))
210 if (!ici->ops->get_formats)
212 * Fallback mode - the host will have to serve all
213 * sensor-provided formats one-to-one to the user
218 * First pass - only count formats this host-sensor
219 * configuration can provide
221 for (i = 0; i < raw_fmts; i++) {
222 ret = ici->ops->get_formats(icd, i, NULL);
232 vmalloc(fmts * sizeof(struct soc_camera_format_xlate));
233 if (!icd->user_formats)
236 icd->num_user_formats = fmts;
238 dev_dbg(&icd->dev, "Found %d supported formats.\n", fmts);
240 /* Second pass - actually fill data formats */
242 for (i = 0; i < raw_fmts; i++)
243 if (!ici->ops->get_formats) {
244 v4l2_subdev_call(sd, video, enum_mbus_fmt, i, &code);
245 icd->user_formats[i].host_fmt =
246 soc_mbus_get_fmtdesc(code);
247 icd->user_formats[i].code = code;
249 ret = ici->ops->get_formats(icd, i,
250 &icd->user_formats[fmts]);
256 icd->current_fmt = &icd->user_formats[0];
261 icd->num_user_formats = 0;
262 vfree(icd->user_formats);
266 /* Always entered with .video_lock held */
267 static void soc_camera_free_user_formats(struct soc_camera_device *icd)
269 struct soc_camera_host *ici = to_soc_camera_host(icd->dev.parent);
271 if (ici->ops->put_formats)
272 ici->ops->put_formats(icd);
273 icd->current_fmt = NULL;
274 icd->num_user_formats = 0;
275 vfree(icd->user_formats);
276 icd->user_formats = NULL;
279 #define pixfmtstr(x) (x) & 0xff, ((x) >> 8) & 0xff, ((x) >> 16) & 0xff, \
282 /* Called with .vb_lock held, or from the first open(2), see comment there */
283 static int soc_camera_set_fmt(struct soc_camera_file *icf,
284 struct v4l2_format *f)
286 struct soc_camera_device *icd = icf->icd;
287 struct soc_camera_host *ici = to_soc_camera_host(icd->dev.parent);
288 struct v4l2_pix_format *pix = &f->fmt.pix;
291 dev_dbg(&icd->dev, "S_FMT(%c%c%c%c, %ux%u)\n",
292 pixfmtstr(pix->pixelformat), pix->width, pix->height);
294 /* We always call try_fmt() before set_fmt() or set_crop() */
295 ret = ici->ops->try_fmt(icd, f);
299 ret = ici->ops->set_fmt(icd, f);
302 } else if (!icd->current_fmt ||
303 icd->current_fmt->host_fmt->fourcc != pix->pixelformat) {
305 "Host driver hasn't set up current format correctly!\n");
309 icd->user_width = pix->width;
310 icd->user_height = pix->height;
311 icd->colorspace = pix->colorspace;
313 icd->field = pix->field;
315 if (f->type != V4L2_BUF_TYPE_VIDEO_CAPTURE)
316 dev_warn(&icd->dev, "Attention! Wrong buf-type %d\n",
319 dev_dbg(&icd->dev, "set width: %d height: %d\n",
320 icd->user_width, icd->user_height);
322 /* set physical bus parameters */
323 return ici->ops->set_bus_param(icd, pix->pixelformat);
326 static int soc_camera_open(struct file *file)
328 struct video_device *vdev = video_devdata(file);
329 struct soc_camera_device *icd = container_of(vdev->parent,
330 struct soc_camera_device,
332 struct soc_camera_link *icl = to_soc_camera_link(icd);
333 struct soc_camera_host *ici;
334 struct soc_camera_file *icf;
338 /* No device driver attached */
341 ici = to_soc_camera_host(icd->dev.parent);
343 icf = vmalloc(sizeof(*icf));
347 if (!try_module_get(ici->ops->owner)) {
348 dev_err(&icd->dev, "Couldn't lock capture bus driver.\n");
354 * Protect against icd->ops->remove() until we module_get() both
357 mutex_lock(&icd->video_lock);
362 /* Now we really have to activate the camera */
363 if (icd->use_count == 1) {
364 /* Restore parameters before the last close() per V4L2 API */
365 struct v4l2_format f = {
366 .type = V4L2_BUF_TYPE_VIDEO_CAPTURE,
368 .width = icd->user_width,
369 .height = icd->user_height,
371 .colorspace = icd->colorspace,
373 icd->current_fmt->host_fmt->fourcc,
378 ret = icl->power(icd->pdev, 1);
383 /* The camera could have been already on, try to reset */
385 icl->reset(icd->pdev);
387 ret = ici->ops->add(icd);
389 dev_err(&icd->dev, "Couldn't activate the camera: %d\n", ret);
393 pm_runtime_enable(&icd->vdev->dev);
394 ret = pm_runtime_resume(&icd->vdev->dev);
395 if (ret < 0 && ret != -ENOSYS)
399 * Try to configure with default parameters. Notice: this is the
400 * very first open, so, we cannot race against other calls,
401 * apart from someone else calling open() simultaneously, but
402 * .video_lock is protecting us against it.
404 ret = soc_camera_set_fmt(icf, &f);
409 file->private_data = icf;
410 dev_dbg(&icd->dev, "camera device open\n");
412 ici->ops->init_videobuf(&icf->vb_vidq, icd);
414 mutex_unlock(&icd->video_lock);
419 * First four errors are entered with the .video_lock held
423 pm_runtime_disable(&icd->vdev->dev);
425 ici->ops->remove(icd);
428 icl->power(icd->pdev, 0);
431 mutex_unlock(&icd->video_lock);
432 module_put(ici->ops->owner);
438 static int soc_camera_close(struct file *file)
440 struct soc_camera_file *icf = file->private_data;
441 struct soc_camera_device *icd = icf->icd;
442 struct soc_camera_host *ici = to_soc_camera_host(icd->dev.parent);
444 mutex_lock(&icd->video_lock);
446 if (!icd->use_count) {
447 struct soc_camera_link *icl = to_soc_camera_link(icd);
449 pm_runtime_suspend(&icd->vdev->dev);
450 pm_runtime_disable(&icd->vdev->dev);
452 ici->ops->remove(icd);
455 icl->power(icd->pdev, 0);
458 mutex_unlock(&icd->video_lock);
460 module_put(ici->ops->owner);
464 dev_dbg(&icd->dev, "camera device close\n");
469 static ssize_t soc_camera_read(struct file *file, char __user *buf,
470 size_t count, loff_t *ppos)
472 struct soc_camera_file *icf = file->private_data;
473 struct soc_camera_device *icd = icf->icd;
476 dev_err(&icd->dev, "camera device read not implemented\n");
481 static int soc_camera_mmap(struct file *file, struct vm_area_struct *vma)
483 struct soc_camera_file *icf = file->private_data;
484 struct soc_camera_device *icd = icf->icd;
487 dev_dbg(&icd->dev, "mmap called, vma=0x%08lx\n", (unsigned long)vma);
489 err = videobuf_mmap_mapper(&icf->vb_vidq, vma);
491 dev_dbg(&icd->dev, "vma start=0x%08lx, size=%ld, ret=%d\n",
492 (unsigned long)vma->vm_start,
493 (unsigned long)vma->vm_end - (unsigned long)vma->vm_start,
499 static unsigned int soc_camera_poll(struct file *file, poll_table *pt)
501 struct soc_camera_file *icf = file->private_data;
502 struct soc_camera_device *icd = icf->icd;
503 struct soc_camera_host *ici = to_soc_camera_host(icd->dev.parent);
505 if (list_empty(&icf->vb_vidq.stream)) {
506 dev_err(&icd->dev, "Trying to poll with no queued buffers!\n");
510 return ici->ops->poll(file, pt);
513 static struct v4l2_file_operations soc_camera_fops = {
514 .owner = THIS_MODULE,
515 .open = soc_camera_open,
516 .release = soc_camera_close,
517 .ioctl = video_ioctl2,
518 .read = soc_camera_read,
519 .mmap = soc_camera_mmap,
520 .poll = soc_camera_poll,
523 static int soc_camera_s_fmt_vid_cap(struct file *file, void *priv,
524 struct v4l2_format *f)
526 struct soc_camera_file *icf = file->private_data;
527 struct soc_camera_device *icd = icf->icd;
530 WARN_ON(priv != file->private_data);
532 mutex_lock(&icf->vb_vidq.vb_lock);
534 if (icf->vb_vidq.bufs[0]) {
535 dev_err(&icd->dev, "S_FMT denied: queue initialised\n");
540 ret = soc_camera_set_fmt(icf, f);
543 mutex_unlock(&icf->vb_vidq.vb_lock);
548 static int soc_camera_enum_fmt_vid_cap(struct file *file, void *priv,
549 struct v4l2_fmtdesc *f)
551 struct soc_camera_file *icf = file->private_data;
552 struct soc_camera_device *icd = icf->icd;
553 const struct soc_mbus_pixelfmt *format;
555 WARN_ON(priv != file->private_data);
557 if (f->index >= icd->num_user_formats)
560 format = icd->user_formats[f->index].host_fmt;
563 strlcpy(f->description, format->name, sizeof(f->description));
564 f->pixelformat = format->fourcc;
568 static int soc_camera_g_fmt_vid_cap(struct file *file, void *priv,
569 struct v4l2_format *f)
571 struct soc_camera_file *icf = file->private_data;
572 struct soc_camera_device *icd = icf->icd;
573 struct v4l2_pix_format *pix = &f->fmt.pix;
575 WARN_ON(priv != file->private_data);
577 pix->width = icd->user_width;
578 pix->height = icd->user_height;
579 pix->field = icf->vb_vidq.field;
580 pix->pixelformat = icd->current_fmt->host_fmt->fourcc;
581 pix->bytesperline = soc_mbus_bytes_per_line(pix->width,
582 icd->current_fmt->host_fmt);
583 pix->colorspace = icd->colorspace;
584 if (pix->bytesperline < 0)
585 return pix->bytesperline;
586 pix->sizeimage = pix->height * pix->bytesperline;
587 dev_dbg(&icd->dev, "current_fmt->fourcc: 0x%08x\n",
588 icd->current_fmt->host_fmt->fourcc);
592 static int soc_camera_querycap(struct file *file, void *priv,
593 struct v4l2_capability *cap)
595 struct soc_camera_file *icf = file->private_data;
596 struct soc_camera_device *icd = icf->icd;
597 struct soc_camera_host *ici = to_soc_camera_host(icd->dev.parent);
599 WARN_ON(priv != file->private_data);
601 strlcpy(cap->driver, ici->drv_name, sizeof(cap->driver));
602 return ici->ops->querycap(ici, cap);
605 static int soc_camera_streamon(struct file *file, void *priv,
606 enum v4l2_buf_type i)
608 struct soc_camera_file *icf = file->private_data;
609 struct soc_camera_device *icd = icf->icd;
610 struct v4l2_subdev *sd = soc_camera_to_subdev(icd);
613 WARN_ON(priv != file->private_data);
615 if (i != V4L2_BUF_TYPE_VIDEO_CAPTURE)
618 mutex_lock(&icd->video_lock);
620 v4l2_subdev_call(sd, video, s_stream, 1);
622 /* This calls buf_queue from host driver's videobuf_queue_ops */
623 ret = videobuf_streamon(&icf->vb_vidq);
625 mutex_unlock(&icd->video_lock);
630 static int soc_camera_streamoff(struct file *file, void *priv,
631 enum v4l2_buf_type i)
633 struct soc_camera_file *icf = file->private_data;
634 struct soc_camera_device *icd = icf->icd;
635 struct v4l2_subdev *sd = soc_camera_to_subdev(icd);
637 WARN_ON(priv != file->private_data);
639 if (i != V4L2_BUF_TYPE_VIDEO_CAPTURE)
642 mutex_lock(&icd->video_lock);
645 * This calls buf_release from host driver's videobuf_queue_ops for all
646 * remaining buffers. When the last buffer is freed, stop capture
648 videobuf_streamoff(&icf->vb_vidq);
650 v4l2_subdev_call(sd, video, s_stream, 0);
652 mutex_unlock(&icd->video_lock);
657 static int soc_camera_queryctrl(struct file *file, void *priv,
658 struct v4l2_queryctrl *qc)
660 struct soc_camera_file *icf = file->private_data;
661 struct soc_camera_device *icd = icf->icd;
662 struct soc_camera_host *ici = to_soc_camera_host(icd->dev.parent);
665 WARN_ON(priv != file->private_data);
670 /* First check host controls */
671 for (i = 0; i < ici->ops->num_controls; i++)
672 if (qc->id == ici->ops->controls[i].id) {
673 memcpy(qc, &(ici->ops->controls[i]),
678 /* Then device controls */
679 for (i = 0; i < icd->ops->num_controls; i++)
680 if (qc->id == icd->ops->controls[i].id) {
681 memcpy(qc, &(icd->ops->controls[i]),
689 static int soc_camera_g_ctrl(struct file *file, void *priv,
690 struct v4l2_control *ctrl)
692 struct soc_camera_file *icf = file->private_data;
693 struct soc_camera_device *icd = icf->icd;
694 struct soc_camera_host *ici = to_soc_camera_host(icd->dev.parent);
695 struct v4l2_subdev *sd = soc_camera_to_subdev(icd);
698 WARN_ON(priv != file->private_data);
700 if (ici->ops->get_ctrl) {
701 ret = ici->ops->get_ctrl(icd, ctrl);
702 if (ret != -ENOIOCTLCMD)
706 return v4l2_subdev_call(sd, core, g_ctrl, ctrl);
709 static int soc_camera_s_ctrl(struct file *file, void *priv,
710 struct v4l2_control *ctrl)
712 struct soc_camera_file *icf = file->private_data;
713 struct soc_camera_device *icd = icf->icd;
714 struct soc_camera_host *ici = to_soc_camera_host(icd->dev.parent);
715 struct v4l2_subdev *sd = soc_camera_to_subdev(icd);
718 WARN_ON(priv != file->private_data);
720 if (ici->ops->set_ctrl) {
721 ret = ici->ops->set_ctrl(icd, ctrl);
722 if (ret != -ENOIOCTLCMD)
726 return v4l2_subdev_call(sd, core, s_ctrl, ctrl);
729 static int soc_camera_cropcap(struct file *file, void *fh,
730 struct v4l2_cropcap *a)
732 struct soc_camera_file *icf = file->private_data;
733 struct soc_camera_device *icd = icf->icd;
734 struct soc_camera_host *ici = to_soc_camera_host(icd->dev.parent);
736 return ici->ops->cropcap(icd, a);
739 static int soc_camera_g_crop(struct file *file, void *fh,
742 struct soc_camera_file *icf = file->private_data;
743 struct soc_camera_device *icd = icf->icd;
744 struct soc_camera_host *ici = to_soc_camera_host(icd->dev.parent);
747 mutex_lock(&icf->vb_vidq.vb_lock);
748 ret = ici->ops->get_crop(icd, a);
749 mutex_unlock(&icf->vb_vidq.vb_lock);
755 * According to the V4L2 API, drivers shall not update the struct v4l2_crop
756 * argument with the actual geometry, instead, the user shall use G_CROP to
759 static int soc_camera_s_crop(struct file *file, void *fh,
762 struct soc_camera_file *icf = file->private_data;
763 struct soc_camera_device *icd = icf->icd;
764 struct soc_camera_host *ici = to_soc_camera_host(icd->dev.parent);
765 struct v4l2_rect *rect = &a->c;
766 struct v4l2_crop current_crop;
769 if (a->type != V4L2_BUF_TYPE_VIDEO_CAPTURE)
772 dev_dbg(&icd->dev, "S_CROP(%ux%u@%u:%u)\n",
773 rect->width, rect->height, rect->left, rect->top);
775 /* Cropping is allowed during a running capture, guard consistency */
776 mutex_lock(&icf->vb_vidq.vb_lock);
778 /* If get_crop fails, we'll let host and / or client drivers decide */
779 ret = ici->ops->get_crop(icd, ¤t_crop);
781 /* Prohibit window size change with initialised buffers */
782 if (icf->vb_vidq.bufs[0] && !ret &&
783 (a->c.width != current_crop.c.width ||
784 a->c.height != current_crop.c.height)) {
786 "S_CROP denied: queue initialised and sizes differ\n");
789 ret = ici->ops->set_crop(icd, a);
792 mutex_unlock(&icf->vb_vidq.vb_lock);
797 static int soc_camera_g_parm(struct file *file, void *fh,
798 struct v4l2_streamparm *a)
800 struct soc_camera_file *icf = file->private_data;
801 struct soc_camera_device *icd = icf->icd;
802 struct soc_camera_host *ici = to_soc_camera_host(icd->dev.parent);
804 if (ici->ops->get_parm)
805 return ici->ops->get_parm(icd, a);
810 static int soc_camera_s_parm(struct file *file, void *fh,
811 struct v4l2_streamparm *a)
813 struct soc_camera_file *icf = file->private_data;
814 struct soc_camera_device *icd = icf->icd;
815 struct soc_camera_host *ici = to_soc_camera_host(icd->dev.parent);
817 if (ici->ops->set_parm)
818 return ici->ops->set_parm(icd, a);
823 static int soc_camera_g_chip_ident(struct file *file, void *fh,
824 struct v4l2_dbg_chip_ident *id)
826 struct soc_camera_file *icf = file->private_data;
827 struct soc_camera_device *icd = icf->icd;
828 struct v4l2_subdev *sd = soc_camera_to_subdev(icd);
830 return v4l2_subdev_call(sd, core, g_chip_ident, id);
833 #ifdef CONFIG_VIDEO_ADV_DEBUG
834 static int soc_camera_g_register(struct file *file, void *fh,
835 struct v4l2_dbg_register *reg)
837 struct soc_camera_file *icf = file->private_data;
838 struct soc_camera_device *icd = icf->icd;
839 struct v4l2_subdev *sd = soc_camera_to_subdev(icd);
841 return v4l2_subdev_call(sd, core, g_register, reg);
844 static int soc_camera_s_register(struct file *file, void *fh,
845 struct v4l2_dbg_register *reg)
847 struct soc_camera_file *icf = file->private_data;
848 struct soc_camera_device *icd = icf->icd;
849 struct v4l2_subdev *sd = soc_camera_to_subdev(icd);
851 return v4l2_subdev_call(sd, core, s_register, reg);
855 /* So far this function cannot fail */
856 static void scan_add_host(struct soc_camera_host *ici)
858 struct soc_camera_device *icd;
860 mutex_lock(&list_lock);
862 list_for_each_entry(icd, &devices, list) {
863 if (icd->iface == ici->nr) {
865 icd->dev.parent = ici->v4l2_dev.dev;
866 dev_set_name(&icd->dev, "%u-%u", icd->iface,
868 ret = device_register(&icd->dev);
870 icd->dev.parent = NULL;
872 "Cannot register device: %d\n", ret);
877 mutex_unlock(&list_lock);
880 #ifdef CONFIG_I2C_BOARDINFO
881 static int soc_camera_init_i2c(struct soc_camera_device *icd,
882 struct soc_camera_link *icl)
884 struct i2c_client *client;
885 struct soc_camera_host *ici = to_soc_camera_host(icd->dev.parent);
886 struct i2c_adapter *adap = i2c_get_adapter(icl->i2c_adapter_id);
887 struct v4l2_subdev *subdev;
890 dev_err(&icd->dev, "Cannot get I2C adapter #%d. No driver?\n",
891 icl->i2c_adapter_id);
895 icl->board_info->platform_data = icd;
897 subdev = v4l2_i2c_new_subdev_board(&ici->v4l2_dev, adap,
898 icl->module_name, icl->board_info, NULL);
902 client = subdev->priv;
904 /* Use to_i2c_client(dev) to recover the i2c client */
905 dev_set_drvdata(&icd->dev, &client->dev);
909 i2c_put_adapter(adap);
914 static void soc_camera_free_i2c(struct soc_camera_device *icd)
916 struct i2c_client *client =
917 to_i2c_client(to_soc_camera_control(icd));
918 dev_set_drvdata(&icd->dev, NULL);
919 v4l2_device_unregister_subdev(i2c_get_clientdata(client));
920 i2c_unregister_device(client);
921 i2c_put_adapter(client->adapter);
924 #define soc_camera_init_i2c(icd, icl) (-ENODEV)
925 #define soc_camera_free_i2c(icd) do {} while (0)
928 static int soc_camera_video_start(struct soc_camera_device *icd);
929 static int video_dev_create(struct soc_camera_device *icd);
930 /* Called during host-driver probe */
931 static int soc_camera_probe(struct device *dev)
933 struct soc_camera_device *icd = to_soc_camera_dev(dev);
934 struct soc_camera_host *ici = to_soc_camera_host(dev->parent);
935 struct soc_camera_link *icl = to_soc_camera_link(icd);
936 struct device *control = NULL;
937 struct v4l2_subdev *sd;
938 struct v4l2_mbus_framefmt mf;
941 dev_info(dev, "Probing %s\n", dev_name(dev));
944 ret = icl->power(icd->pdev, 1);
947 "Platform failed to power-on the camera.\n");
952 /* The camera could have been already on, try to reset */
954 icl->reset(icd->pdev);
956 ret = ici->ops->add(icd);
960 /* Must have icd->vdev before registering the device */
961 ret = video_dev_create(icd);
965 /* Non-i2c cameras, e.g., soc_camera_platform, have no board_info */
966 if (icl->board_info) {
967 ret = soc_camera_init_i2c(icd, icl);
970 } else if (!icl->add_device || !icl->del_device) {
974 if (icl->module_name)
975 ret = request_module(icl->module_name);
977 ret = icl->add_device(icl, &icd->dev);
982 * FIXME: this is racy, have to use driver-binding notification,
983 * when it is available
985 control = to_soc_camera_control(icd);
986 if (!control || !control->driver || !dev_get_drvdata(control) ||
987 !try_module_get(control->driver->owner)) {
988 icl->del_device(icl);
993 /* At this point client .probe() should have run already */
994 ret = soc_camera_init_user_formats(icd);
998 icd->field = V4L2_FIELD_ANY;
1000 /* ..._video_start() will create a device node, so we have to protect */
1001 mutex_lock(&icd->video_lock);
1003 ret = soc_camera_video_start(icd);
1007 /* Try to improve our guess of a reasonable window format */
1008 sd = soc_camera_to_subdev(icd);
1009 if (!v4l2_subdev_call(sd, video, g_mbus_fmt, &mf)) {
1010 icd->user_width = mf.width;
1011 icd->user_height = mf.height;
1012 icd->colorspace = mf.colorspace;
1013 icd->field = mf.field;
1016 /* Do we have to sysfs_remove_link() before device_unregister()? */
1017 if (sysfs_create_link(&icd->dev.kobj, &to_soc_camera_control(icd)->kobj,
1019 dev_warn(&icd->dev, "Failed creating the control symlink\n");
1021 ici->ops->remove(icd);
1024 icl->power(icd->pdev, 0);
1026 mutex_unlock(&icd->video_lock);
1031 mutex_unlock(&icd->video_lock);
1032 soc_camera_free_user_formats(icd);
1034 if (icl->board_info) {
1035 soc_camera_free_i2c(icd);
1037 icl->del_device(icl);
1038 module_put(control->driver->owner);
1042 video_device_release(icd->vdev);
1044 ici->ops->remove(icd);
1047 icl->power(icd->pdev, 0);
1053 * This is called on device_unregister, which only means we have to disconnect
1054 * from the host, but not remove ourselves from the device list
1056 static int soc_camera_remove(struct device *dev)
1058 struct soc_camera_device *icd = to_soc_camera_dev(dev);
1059 struct soc_camera_link *icl = to_soc_camera_link(icd);
1060 struct video_device *vdev = icd->vdev;
1062 BUG_ON(!dev->parent);
1065 mutex_lock(&icd->video_lock);
1066 video_unregister_device(vdev);
1068 mutex_unlock(&icd->video_lock);
1071 if (icl->board_info) {
1072 soc_camera_free_i2c(icd);
1074 struct device_driver *drv = to_soc_camera_control(icd) ?
1075 to_soc_camera_control(icd)->driver : NULL;
1077 icl->del_device(icl);
1078 module_put(drv->owner);
1081 soc_camera_free_user_formats(icd);
1086 static int soc_camera_suspend(struct device *dev, pm_message_t state)
1088 struct soc_camera_device *icd = to_soc_camera_dev(dev);
1089 struct soc_camera_host *ici = to_soc_camera_host(icd->dev.parent);
1092 if (ici->ops->suspend)
1093 ret = ici->ops->suspend(icd, state);
1098 static int soc_camera_resume(struct device *dev)
1100 struct soc_camera_device *icd = to_soc_camera_dev(dev);
1101 struct soc_camera_host *ici = to_soc_camera_host(icd->dev.parent);
1104 if (ici->ops->resume)
1105 ret = ici->ops->resume(icd);
1110 static struct bus_type soc_camera_bus_type = {
1111 .name = "soc-camera",
1112 .probe = soc_camera_probe,
1113 .remove = soc_camera_remove,
1114 .suspend = soc_camera_suspend,
1115 .resume = soc_camera_resume,
1118 static struct device_driver ic_drv = {
1120 .bus = &soc_camera_bus_type,
1121 .owner = THIS_MODULE,
1124 static void dummy_release(struct device *dev)
1128 static int default_cropcap(struct soc_camera_device *icd,
1129 struct v4l2_cropcap *a)
1131 struct v4l2_subdev *sd = soc_camera_to_subdev(icd);
1132 return v4l2_subdev_call(sd, video, cropcap, a);
1135 static int default_g_crop(struct soc_camera_device *icd, struct v4l2_crop *a)
1137 struct v4l2_subdev *sd = soc_camera_to_subdev(icd);
1138 return v4l2_subdev_call(sd, video, g_crop, a);
1141 static int default_s_crop(struct soc_camera_device *icd, struct v4l2_crop *a)
1143 struct v4l2_subdev *sd = soc_camera_to_subdev(icd);
1144 return v4l2_subdev_call(sd, video, s_crop, a);
1147 static void soc_camera_device_init(struct device *dev, void *pdata)
1149 dev->platform_data = pdata;
1150 dev->bus = &soc_camera_bus_type;
1151 dev->release = dummy_release;
1154 int soc_camera_host_register(struct soc_camera_host *ici)
1156 struct soc_camera_host *ix;
1159 if (!ici || !ici->ops ||
1160 !ici->ops->try_fmt ||
1161 !ici->ops->set_fmt ||
1162 !ici->ops->set_bus_param ||
1163 !ici->ops->querycap ||
1164 !ici->ops->init_videobuf ||
1165 !ici->ops->reqbufs ||
1167 !ici->ops->remove ||
1172 if (!ici->ops->set_crop)
1173 ici->ops->set_crop = default_s_crop;
1174 if (!ici->ops->get_crop)
1175 ici->ops->get_crop = default_g_crop;
1176 if (!ici->ops->cropcap)
1177 ici->ops->cropcap = default_cropcap;
1179 mutex_lock(&list_lock);
1180 list_for_each_entry(ix, &hosts, list) {
1181 if (ix->nr == ici->nr) {
1187 ret = v4l2_device_register(ici->v4l2_dev.dev, &ici->v4l2_dev);
1191 list_add_tail(&ici->list, &hosts);
1192 mutex_unlock(&list_lock);
1199 mutex_unlock(&list_lock);
1202 EXPORT_SYMBOL(soc_camera_host_register);
1204 /* Unregister all clients! */
1205 void soc_camera_host_unregister(struct soc_camera_host *ici)
1207 struct soc_camera_device *icd;
1209 mutex_lock(&list_lock);
1211 list_del(&ici->list);
1213 list_for_each_entry(icd, &devices, list) {
1214 if (icd->iface == ici->nr) {
1215 void *pdata = icd->dev.platform_data;
1216 /* The bus->remove will be called */
1217 device_unregister(&icd->dev);
1219 * Not before device_unregister(), .remove
1220 * needs parent to call ici->ops->remove().
1221 * If the host module is loaded again, device_register()
1222 * would complain "already initialised," since 2.6.32
1223 * this is also needed to prevent use-after-free of the
1224 * device private data.
1226 memset(&icd->dev, 0, sizeof(icd->dev));
1227 soc_camera_device_init(&icd->dev, pdata);
1231 mutex_unlock(&list_lock);
1233 v4l2_device_unregister(&ici->v4l2_dev);
1235 EXPORT_SYMBOL(soc_camera_host_unregister);
1237 /* Image capture device */
1238 static int soc_camera_device_register(struct soc_camera_device *icd)
1240 struct soc_camera_device *ix;
1243 for (i = 0; i < 256 && num < 0; i++) {
1245 /* Check if this index is available on this interface */
1246 list_for_each_entry(ix, &devices, list) {
1247 if (ix->iface == icd->iface && ix->devnum == i) {
1256 * ok, we have 256 cameras on this host...
1257 * man, stay reasonable...
1263 icd->host_priv = NULL;
1264 mutex_init(&icd->video_lock);
1266 list_add_tail(&icd->list, &devices);
1271 static void soc_camera_device_unregister(struct soc_camera_device *icd)
1273 list_del(&icd->list);
1276 static const struct v4l2_ioctl_ops soc_camera_ioctl_ops = {
1277 .vidioc_querycap = soc_camera_querycap,
1278 .vidioc_g_fmt_vid_cap = soc_camera_g_fmt_vid_cap,
1279 .vidioc_enum_fmt_vid_cap = soc_camera_enum_fmt_vid_cap,
1280 .vidioc_s_fmt_vid_cap = soc_camera_s_fmt_vid_cap,
1281 .vidioc_enum_input = soc_camera_enum_input,
1282 .vidioc_g_input = soc_camera_g_input,
1283 .vidioc_s_input = soc_camera_s_input,
1284 .vidioc_s_std = soc_camera_s_std,
1285 .vidioc_reqbufs = soc_camera_reqbufs,
1286 .vidioc_try_fmt_vid_cap = soc_camera_try_fmt_vid_cap,
1287 .vidioc_querybuf = soc_camera_querybuf,
1288 .vidioc_qbuf = soc_camera_qbuf,
1289 .vidioc_dqbuf = soc_camera_dqbuf,
1290 .vidioc_streamon = soc_camera_streamon,
1291 .vidioc_streamoff = soc_camera_streamoff,
1292 .vidioc_queryctrl = soc_camera_queryctrl,
1293 .vidioc_g_ctrl = soc_camera_g_ctrl,
1294 .vidioc_s_ctrl = soc_camera_s_ctrl,
1295 .vidioc_cropcap = soc_camera_cropcap,
1296 .vidioc_g_crop = soc_camera_g_crop,
1297 .vidioc_s_crop = soc_camera_s_crop,
1298 .vidioc_g_parm = soc_camera_g_parm,
1299 .vidioc_s_parm = soc_camera_s_parm,
1300 .vidioc_g_chip_ident = soc_camera_g_chip_ident,
1301 #ifdef CONFIG_VIDEO_ADV_DEBUG
1302 .vidioc_g_register = soc_camera_g_register,
1303 .vidioc_s_register = soc_camera_s_register,
1307 static int video_dev_create(struct soc_camera_device *icd)
1309 struct soc_camera_host *ici = to_soc_camera_host(icd->dev.parent);
1310 struct video_device *vdev = video_device_alloc();
1315 strlcpy(vdev->name, ici->drv_name, sizeof(vdev->name));
1317 vdev->parent = &icd->dev;
1318 vdev->current_norm = V4L2_STD_UNKNOWN;
1319 vdev->fops = &soc_camera_fops;
1320 vdev->ioctl_ops = &soc_camera_ioctl_ops;
1321 vdev->release = video_device_release;
1322 vdev->tvnorms = V4L2_STD_UNKNOWN;
1330 * Called from soc_camera_probe() above (with .video_lock held???)
1332 static int soc_camera_video_start(struct soc_camera_device *icd)
1334 struct device_type *type = icd->vdev->dev.type;
1337 if (!icd->dev.parent)
1341 !icd->ops->query_bus_param ||
1342 !icd->ops->set_bus_param)
1345 ret = video_register_device(icd->vdev, VFL_TYPE_GRABBER, -1);
1347 dev_err(&icd->dev, "video_register_device failed: %d\n", ret);
1351 /* Restore device type, possibly set by the subdevice driver */
1352 icd->vdev->dev.type = type;
1357 static int __devinit soc_camera_pdrv_probe(struct platform_device *pdev)
1359 struct soc_camera_link *icl = pdev->dev.platform_data;
1360 struct soc_camera_device *icd;
1366 icd = kzalloc(sizeof(*icd), GFP_KERNEL);
1370 icd->iface = icl->bus_id;
1371 icd->pdev = &pdev->dev;
1372 platform_set_drvdata(pdev, icd);
1374 ret = soc_camera_device_register(icd);
1378 soc_camera_device_init(&icd->dev, icl);
1380 icd->user_width = DEFAULT_WIDTH;
1381 icd->user_height = DEFAULT_HEIGHT;
1392 * Only called on rmmod for each platform device, since they are not
1393 * hot-pluggable. Now we know, that all our users - hosts and devices have
1394 * been unloaded already
1396 static int __devexit soc_camera_pdrv_remove(struct platform_device *pdev)
1398 struct soc_camera_device *icd = platform_get_drvdata(pdev);
1403 soc_camera_device_unregister(icd);
1410 static struct platform_driver __refdata soc_camera_pdrv = {
1411 .remove = __devexit_p(soc_camera_pdrv_remove),
1413 .name = "soc-camera-pdrv",
1414 .owner = THIS_MODULE,
1418 static int __init soc_camera_init(void)
1420 int ret = bus_register(&soc_camera_bus_type);
1423 ret = driver_register(&ic_drv);
1427 ret = platform_driver_probe(&soc_camera_pdrv, soc_camera_pdrv_probe);
1434 driver_unregister(&ic_drv);
1436 bus_unregister(&soc_camera_bus_type);
1440 static void __exit soc_camera_exit(void)
1442 platform_driver_unregister(&soc_camera_pdrv);
1443 driver_unregister(&ic_drv);
1444 bus_unregister(&soc_camera_bus_type);
1447 module_init(soc_camera_init);
1448 module_exit(soc_camera_exit);
1450 MODULE_DESCRIPTION("Image capture bus driver");
1451 MODULE_AUTHOR("Guennadi Liakhovetski <kernel@pengutronix.de>");
1452 MODULE_LICENSE("GPL");
1453 MODULE_ALIAS("platform:soc-camera-pdrv");