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/regulator/consumer.h>
28 #include <linux/slab.h>
29 #include <linux/pm_runtime.h>
30 #include <linux/vmalloc.h>
32 #include <media/soc_camera.h>
33 #include <media/v4l2-common.h>
34 #include <media/v4l2-ioctl.h>
35 #include <media/v4l2-dev.h>
36 #include <media/videobuf-core.h>
37 #include <media/videobuf2-core.h>
38 #include <media/soc_mediabus.h>
40 /* Default to VGA resolution */
41 #define DEFAULT_WIDTH 640
42 #define DEFAULT_HEIGHT 480
44 #define is_streaming(ici, icd) \
45 (((ici)->ops->init_videobuf) ? \
46 (icd)->vb_vidq.streaming : \
47 vb2_is_streaming(&(icd)->vb2_vidq))
49 static LIST_HEAD(hosts);
50 static LIST_HEAD(devices);
51 static DEFINE_MUTEX(list_lock); /* Protects the list of hosts */
53 static int soc_camera_power_set(struct soc_camera_device *icd,
54 struct soc_camera_link *icl,
60 ret = regulator_bulk_enable(icl->num_regulators,
63 dev_err(&icd->dev, "Cannot enable regulators\n");
68 ret = icl->power(icd->pdev, power_on);
71 "Platform failed to power-on the camera.\n");
73 regulator_bulk_disable(icl->num_regulators,
80 ret = icl->power(icd->pdev, 0);
83 "Platform failed to power-off the camera.\n");
87 ret = regulator_bulk_disable(icl->num_regulators,
90 dev_err(&icd->dev, "Cannot disable regulators\n");
98 const struct soc_camera_format_xlate *soc_camera_xlate_by_fourcc(
99 struct soc_camera_device *icd, unsigned int fourcc)
103 for (i = 0; i < icd->num_user_formats; i++)
104 if (icd->user_formats[i].host_fmt->fourcc == fourcc)
105 return icd->user_formats + i;
108 EXPORT_SYMBOL(soc_camera_xlate_by_fourcc);
111 * soc_camera_apply_sensor_flags() - apply platform SOCAM_SENSOR_INVERT_* flags
112 * @icl: camera platform parameters
113 * @flags: flags to be inverted according to platform configuration
114 * @return: resulting flags
116 unsigned long soc_camera_apply_sensor_flags(struct soc_camera_link *icl,
121 /* If only one of the two polarities is supported, switch to the opposite */
122 if (icl->flags & SOCAM_SENSOR_INVERT_HSYNC) {
123 f = flags & (SOCAM_HSYNC_ACTIVE_HIGH | SOCAM_HSYNC_ACTIVE_LOW);
124 if (f == SOCAM_HSYNC_ACTIVE_HIGH || f == SOCAM_HSYNC_ACTIVE_LOW)
125 flags ^= SOCAM_HSYNC_ACTIVE_HIGH | SOCAM_HSYNC_ACTIVE_LOW;
128 if (icl->flags & SOCAM_SENSOR_INVERT_VSYNC) {
129 f = flags & (SOCAM_VSYNC_ACTIVE_HIGH | SOCAM_VSYNC_ACTIVE_LOW);
130 if (f == SOCAM_VSYNC_ACTIVE_HIGH || f == SOCAM_VSYNC_ACTIVE_LOW)
131 flags ^= SOCAM_VSYNC_ACTIVE_HIGH | SOCAM_VSYNC_ACTIVE_LOW;
134 if (icl->flags & SOCAM_SENSOR_INVERT_PCLK) {
135 f = flags & (SOCAM_PCLK_SAMPLE_RISING | SOCAM_PCLK_SAMPLE_FALLING);
136 if (f == SOCAM_PCLK_SAMPLE_RISING || f == SOCAM_PCLK_SAMPLE_FALLING)
137 flags ^= SOCAM_PCLK_SAMPLE_RISING | SOCAM_PCLK_SAMPLE_FALLING;
142 EXPORT_SYMBOL(soc_camera_apply_sensor_flags);
144 #define pixfmtstr(x) (x) & 0xff, ((x) >> 8) & 0xff, ((x) >> 16) & 0xff, \
147 static int soc_camera_try_fmt(struct soc_camera_device *icd,
148 struct v4l2_format *f)
150 struct soc_camera_host *ici = to_soc_camera_host(icd->dev.parent);
151 struct v4l2_pix_format *pix = &f->fmt.pix;
154 dev_dbg(&icd->dev, "TRY_FMT(%c%c%c%c, %ux%u)\n",
155 pixfmtstr(pix->pixelformat), pix->width, pix->height);
157 pix->bytesperline = 0;
160 ret = ici->ops->try_fmt(icd, f);
164 if (!pix->sizeimage) {
165 if (!pix->bytesperline) {
166 const struct soc_camera_format_xlate *xlate;
168 xlate = soc_camera_xlate_by_fourcc(icd, pix->pixelformat);
172 ret = soc_mbus_bytes_per_line(pix->width,
175 pix->bytesperline = ret;
177 if (pix->bytesperline)
178 pix->sizeimage = pix->bytesperline * pix->height;
184 static int soc_camera_try_fmt_vid_cap(struct file *file, void *priv,
185 struct v4l2_format *f)
187 struct soc_camera_device *icd = file->private_data;
189 WARN_ON(priv != file->private_data);
191 /* Only single-plane capture is supported so far */
192 if (f->type != V4L2_BUF_TYPE_VIDEO_CAPTURE)
195 /* limit format to hardware capabilities */
196 return soc_camera_try_fmt(icd, f);
199 static int soc_camera_enum_input(struct file *file, void *priv,
200 struct v4l2_input *inp)
202 struct soc_camera_device *icd = file->private_data;
208 if (icd->ops->enum_input)
209 ret = icd->ops->enum_input(icd, inp);
211 /* default is camera */
212 inp->type = V4L2_INPUT_TYPE_CAMERA;
213 inp->std = V4L2_STD_UNKNOWN;
214 strcpy(inp->name, "Camera");
220 static int soc_camera_g_input(struct file *file, void *priv, unsigned int *i)
227 static int soc_camera_s_input(struct file *file, void *priv, unsigned int i)
235 static int soc_camera_s_std(struct file *file, void *priv, v4l2_std_id *a)
237 struct soc_camera_device *icd = file->private_data;
238 struct v4l2_subdev *sd = soc_camera_to_subdev(icd);
240 return v4l2_subdev_call(sd, core, s_std, *a);
243 static int soc_camera_enum_fsizes(struct file *file, void *fh,
244 struct v4l2_frmsizeenum *fsize)
246 struct soc_camera_device *icd = file->private_data;
247 struct soc_camera_host *ici = to_soc_camera_host(icd->dev.parent);
249 return ici->ops->enum_fsizes(icd, fsize);
252 static int soc_camera_reqbufs(struct file *file, void *priv,
253 struct v4l2_requestbuffers *p)
256 struct soc_camera_device *icd = file->private_data;
257 struct soc_camera_host *ici = to_soc_camera_host(icd->dev.parent);
259 WARN_ON(priv != file->private_data);
261 if (icd->streamer && icd->streamer != file)
264 if (ici->ops->init_videobuf) {
265 ret = videobuf_reqbufs(&icd->vb_vidq, p);
269 ret = ici->ops->reqbufs(icd, p);
271 ret = vb2_reqbufs(&icd->vb2_vidq, p);
274 if (!ret && !icd->streamer)
275 icd->streamer = file;
280 static int soc_camera_querybuf(struct file *file, void *priv,
281 struct v4l2_buffer *p)
283 struct soc_camera_device *icd = file->private_data;
284 struct soc_camera_host *ici = to_soc_camera_host(icd->dev.parent);
286 WARN_ON(priv != file->private_data);
288 if (ici->ops->init_videobuf)
289 return videobuf_querybuf(&icd->vb_vidq, p);
291 return vb2_querybuf(&icd->vb2_vidq, p);
294 static int soc_camera_qbuf(struct file *file, void *priv,
295 struct v4l2_buffer *p)
297 struct soc_camera_device *icd = file->private_data;
298 struct soc_camera_host *ici = to_soc_camera_host(icd->dev.parent);
300 WARN_ON(priv != file->private_data);
302 if (icd->streamer != file)
305 if (ici->ops->init_videobuf)
306 return videobuf_qbuf(&icd->vb_vidq, p);
308 return vb2_qbuf(&icd->vb2_vidq, p);
311 static int soc_camera_dqbuf(struct file *file, void *priv,
312 struct v4l2_buffer *p)
314 struct soc_camera_device *icd = file->private_data;
315 struct soc_camera_host *ici = to_soc_camera_host(icd->dev.parent);
317 WARN_ON(priv != file->private_data);
319 if (icd->streamer != file)
322 if (ici->ops->init_videobuf)
323 return videobuf_dqbuf(&icd->vb_vidq, p, file->f_flags & O_NONBLOCK);
325 return vb2_dqbuf(&icd->vb2_vidq, p, file->f_flags & O_NONBLOCK);
328 /* Always entered with .video_lock held */
329 static int soc_camera_init_user_formats(struct soc_camera_device *icd)
331 struct v4l2_subdev *sd = soc_camera_to_subdev(icd);
332 struct soc_camera_host *ici = to_soc_camera_host(icd->dev.parent);
333 unsigned int i, fmts = 0, raw_fmts = 0;
335 enum v4l2_mbus_pixelcode code;
337 while (!v4l2_subdev_call(sd, video, enum_mbus_fmt, raw_fmts, &code))
340 if (!ici->ops->get_formats)
342 * Fallback mode - the host will have to serve all
343 * sensor-provided formats one-to-one to the user
348 * First pass - only count formats this host-sensor
349 * configuration can provide
351 for (i = 0; i < raw_fmts; i++) {
352 ret = ici->ops->get_formats(icd, i, NULL);
362 vmalloc(fmts * sizeof(struct soc_camera_format_xlate));
363 if (!icd->user_formats)
366 icd->num_user_formats = fmts;
368 dev_dbg(&icd->dev, "Found %d supported formats.\n", fmts);
370 /* Second pass - actually fill data formats */
372 for (i = 0; i < raw_fmts; i++)
373 if (!ici->ops->get_formats) {
374 v4l2_subdev_call(sd, video, enum_mbus_fmt, i, &code);
375 icd->user_formats[i].host_fmt =
376 soc_mbus_get_fmtdesc(code);
377 icd->user_formats[i].code = code;
379 ret = ici->ops->get_formats(icd, i,
380 &icd->user_formats[fmts]);
386 icd->current_fmt = &icd->user_formats[0];
391 icd->num_user_formats = 0;
392 vfree(icd->user_formats);
396 /* Always entered with .video_lock held */
397 static void soc_camera_free_user_formats(struct soc_camera_device *icd)
399 struct soc_camera_host *ici = to_soc_camera_host(icd->dev.parent);
401 if (ici->ops->put_formats)
402 ici->ops->put_formats(icd);
403 icd->current_fmt = NULL;
404 icd->num_user_formats = 0;
405 vfree(icd->user_formats);
406 icd->user_formats = NULL;
409 /* Called with .vb_lock held, or from the first open(2), see comment there */
410 static int soc_camera_set_fmt(struct soc_camera_device *icd,
411 struct v4l2_format *f)
413 struct soc_camera_host *ici = to_soc_camera_host(icd->dev.parent);
414 struct v4l2_pix_format *pix = &f->fmt.pix;
417 dev_dbg(&icd->dev, "S_FMT(%c%c%c%c, %ux%u)\n",
418 pixfmtstr(pix->pixelformat), pix->width, pix->height);
420 /* We always call try_fmt() before set_fmt() or set_crop() */
421 ret = soc_camera_try_fmt(icd, f);
425 ret = ici->ops->set_fmt(icd, f);
428 } else if (!icd->current_fmt ||
429 icd->current_fmt->host_fmt->fourcc != pix->pixelformat) {
431 "Host driver hasn't set up current format correctly!\n");
435 icd->user_width = pix->width;
436 icd->user_height = pix->height;
437 icd->bytesperline = pix->bytesperline;
438 icd->sizeimage = pix->sizeimage;
439 icd->colorspace = pix->colorspace;
440 icd->field = pix->field;
441 if (ici->ops->init_videobuf)
442 icd->vb_vidq.field = pix->field;
444 dev_dbg(&icd->dev, "set width: %d height: %d\n",
445 icd->user_width, icd->user_height);
447 /* set physical bus parameters */
448 return ici->ops->set_bus_param(icd, pix->pixelformat);
451 static int soc_camera_open(struct file *file)
453 struct video_device *vdev = video_devdata(file);
454 struct soc_camera_device *icd = container_of(vdev->parent,
455 struct soc_camera_device,
457 struct soc_camera_link *icl = to_soc_camera_link(icd);
458 struct soc_camera_host *ici;
462 /* No device driver attached */
465 ici = to_soc_camera_host(icd->dev.parent);
467 if (!try_module_get(ici->ops->owner)) {
468 dev_err(&icd->dev, "Couldn't lock capture bus driver.\n");
474 /* Now we really have to activate the camera */
475 if (icd->use_count == 1) {
476 /* Restore parameters before the last close() per V4L2 API */
477 struct v4l2_format f = {
478 .type = V4L2_BUF_TYPE_VIDEO_CAPTURE,
480 .width = icd->user_width,
481 .height = icd->user_height,
483 .colorspace = icd->colorspace,
485 icd->current_fmt->host_fmt->fourcc,
489 ret = soc_camera_power_set(icd, icl, 1);
493 /* The camera could have been already on, try to reset */
495 icl->reset(icd->pdev);
497 ret = ici->ops->add(icd);
499 dev_err(&icd->dev, "Couldn't activate the camera: %d\n", ret);
503 pm_runtime_enable(&icd->vdev->dev);
504 ret = pm_runtime_resume(&icd->vdev->dev);
505 if (ret < 0 && ret != -ENOSYS)
509 * Try to configure with default parameters. Notice: this is the
510 * very first open, so, we cannot race against other calls,
511 * apart from someone else calling open() simultaneously, but
512 * .video_lock is protecting us against it.
514 ret = soc_camera_set_fmt(icd, &f);
518 if (ici->ops->init_videobuf) {
519 ici->ops->init_videobuf(&icd->vb_vidq, icd);
521 ret = ici->ops->init_videobuf2(&icd->vb2_vidq, icd);
527 file->private_data = icd;
528 dev_dbg(&icd->dev, "camera device open\n");
533 * First four errors are entered with the .video_lock held
538 pm_runtime_disable(&icd->vdev->dev);
540 ici->ops->remove(icd);
542 soc_camera_power_set(icd, icl, 0);
545 module_put(ici->ops->owner);
550 static int soc_camera_close(struct file *file)
552 struct soc_camera_device *icd = file->private_data;
553 struct soc_camera_host *ici = to_soc_camera_host(icd->dev.parent);
556 if (!icd->use_count) {
557 struct soc_camera_link *icl = to_soc_camera_link(icd);
559 pm_runtime_suspend(&icd->vdev->dev);
560 pm_runtime_disable(&icd->vdev->dev);
562 ici->ops->remove(icd);
563 if (ici->ops->init_videobuf2)
564 vb2_queue_release(&icd->vb2_vidq);
566 soc_camera_power_set(icd, icl, 0);
569 if (icd->streamer == file)
570 icd->streamer = NULL;
572 module_put(ici->ops->owner);
574 dev_dbg(&icd->dev, "camera device close\n");
579 static ssize_t soc_camera_read(struct file *file, char __user *buf,
580 size_t count, loff_t *ppos)
582 struct soc_camera_device *icd = file->private_data;
585 dev_err(&icd->dev, "camera device read not implemented\n");
590 static int soc_camera_mmap(struct file *file, struct vm_area_struct *vma)
592 struct soc_camera_device *icd = file->private_data;
593 struct soc_camera_host *ici = to_soc_camera_host(icd->dev.parent);
596 dev_dbg(&icd->dev, "mmap called, vma=0x%08lx\n", (unsigned long)vma);
598 if (icd->streamer != file)
601 if (ici->ops->init_videobuf)
602 err = videobuf_mmap_mapper(&icd->vb_vidq, vma);
604 err = vb2_mmap(&icd->vb2_vidq, vma);
606 dev_dbg(&icd->dev, "vma start=0x%08lx, size=%ld, ret=%d\n",
607 (unsigned long)vma->vm_start,
608 (unsigned long)vma->vm_end - (unsigned long)vma->vm_start,
614 static unsigned int soc_camera_poll(struct file *file, poll_table *pt)
616 struct soc_camera_device *icd = file->private_data;
617 struct soc_camera_host *ici = to_soc_camera_host(icd->dev.parent);
619 if (icd->streamer != file)
622 if (ici->ops->init_videobuf && list_empty(&icd->vb_vidq.stream)) {
623 dev_err(&icd->dev, "Trying to poll with no queued buffers!\n");
627 return ici->ops->poll(file, pt);
630 void soc_camera_lock(struct vb2_queue *vq)
632 struct soc_camera_device *icd = vb2_get_drv_priv(vq);
633 mutex_lock(&icd->video_lock);
635 EXPORT_SYMBOL(soc_camera_lock);
637 void soc_camera_unlock(struct vb2_queue *vq)
639 struct soc_camera_device *icd = vb2_get_drv_priv(vq);
640 mutex_unlock(&icd->video_lock);
642 EXPORT_SYMBOL(soc_camera_unlock);
644 static struct v4l2_file_operations soc_camera_fops = {
645 .owner = THIS_MODULE,
646 .open = soc_camera_open,
647 .release = soc_camera_close,
648 .unlocked_ioctl = video_ioctl2,
649 .read = soc_camera_read,
650 .mmap = soc_camera_mmap,
651 .poll = soc_camera_poll,
654 static int soc_camera_s_fmt_vid_cap(struct file *file, void *priv,
655 struct v4l2_format *f)
657 struct soc_camera_device *icd = file->private_data;
660 WARN_ON(priv != file->private_data);
662 if (f->type != V4L2_BUF_TYPE_VIDEO_CAPTURE) {
663 dev_warn(&icd->dev, "Wrong buf-type %d\n", f->type);
667 if (icd->streamer && icd->streamer != file)
670 if (is_streaming(to_soc_camera_host(icd->dev.parent), icd)) {
671 dev_err(&icd->dev, "S_FMT denied: queue initialised\n");
675 ret = soc_camera_set_fmt(icd, f);
677 if (!ret && !icd->streamer)
678 icd->streamer = file;
683 static int soc_camera_enum_fmt_vid_cap(struct file *file, void *priv,
684 struct v4l2_fmtdesc *f)
686 struct soc_camera_device *icd = file->private_data;
687 const struct soc_mbus_pixelfmt *format;
689 WARN_ON(priv != file->private_data);
691 if (f->index >= icd->num_user_formats)
694 format = icd->user_formats[f->index].host_fmt;
697 strlcpy(f->description, format->name, sizeof(f->description));
698 f->pixelformat = format->fourcc;
702 static int soc_camera_g_fmt_vid_cap(struct file *file, void *priv,
703 struct v4l2_format *f)
705 struct soc_camera_device *icd = file->private_data;
706 struct v4l2_pix_format *pix = &f->fmt.pix;
708 WARN_ON(priv != file->private_data);
710 if (f->type != V4L2_BUF_TYPE_VIDEO_CAPTURE)
713 pix->width = icd->user_width;
714 pix->height = icd->user_height;
715 pix->bytesperline = icd->bytesperline;
716 pix->sizeimage = icd->sizeimage;
717 pix->field = icd->field;
718 pix->pixelformat = icd->current_fmt->host_fmt->fourcc;
719 pix->colorspace = icd->colorspace;
720 dev_dbg(&icd->dev, "current_fmt->fourcc: 0x%08x\n",
721 icd->current_fmt->host_fmt->fourcc);
725 static int soc_camera_querycap(struct file *file, void *priv,
726 struct v4l2_capability *cap)
728 struct soc_camera_device *icd = file->private_data;
729 struct soc_camera_host *ici = to_soc_camera_host(icd->dev.parent);
731 WARN_ON(priv != file->private_data);
733 strlcpy(cap->driver, ici->drv_name, sizeof(cap->driver));
734 return ici->ops->querycap(ici, cap);
737 static int soc_camera_streamon(struct file *file, void *priv,
738 enum v4l2_buf_type i)
740 struct soc_camera_device *icd = file->private_data;
741 struct soc_camera_host *ici = to_soc_camera_host(icd->dev.parent);
742 struct v4l2_subdev *sd = soc_camera_to_subdev(icd);
745 WARN_ON(priv != file->private_data);
747 if (i != V4L2_BUF_TYPE_VIDEO_CAPTURE)
750 if (icd->streamer != file)
753 /* This calls buf_queue from host driver's videobuf_queue_ops */
754 if (ici->ops->init_videobuf)
755 ret = videobuf_streamon(&icd->vb_vidq);
757 ret = vb2_streamon(&icd->vb2_vidq, i);
760 v4l2_subdev_call(sd, video, s_stream, 1);
765 static int soc_camera_streamoff(struct file *file, void *priv,
766 enum v4l2_buf_type i)
768 struct soc_camera_device *icd = file->private_data;
769 struct v4l2_subdev *sd = soc_camera_to_subdev(icd);
770 struct soc_camera_host *ici = to_soc_camera_host(icd->dev.parent);
772 WARN_ON(priv != file->private_data);
774 if (i != V4L2_BUF_TYPE_VIDEO_CAPTURE)
777 if (icd->streamer != file)
781 * This calls buf_release from host driver's videobuf_queue_ops for all
782 * remaining buffers. When the last buffer is freed, stop capture
784 if (ici->ops->init_videobuf)
785 videobuf_streamoff(&icd->vb_vidq);
787 vb2_streamoff(&icd->vb2_vidq, i);
789 v4l2_subdev_call(sd, video, s_stream, 0);
794 static int soc_camera_queryctrl(struct file *file, void *priv,
795 struct v4l2_queryctrl *qc)
797 struct soc_camera_device *icd = file->private_data;
798 struct soc_camera_host *ici = to_soc_camera_host(icd->dev.parent);
801 WARN_ON(priv != file->private_data);
806 /* First check host controls */
807 for (i = 0; i < ici->ops->num_controls; i++)
808 if (qc->id == ici->ops->controls[i].id) {
809 memcpy(qc, &(ici->ops->controls[i]),
814 /* Then device controls */
815 for (i = 0; i < icd->ops->num_controls; i++)
816 if (qc->id == icd->ops->controls[i].id) {
817 memcpy(qc, &(icd->ops->controls[i]),
825 static int soc_camera_g_ctrl(struct file *file, void *priv,
826 struct v4l2_control *ctrl)
828 struct soc_camera_device *icd = file->private_data;
829 struct soc_camera_host *ici = to_soc_camera_host(icd->dev.parent);
830 struct v4l2_subdev *sd = soc_camera_to_subdev(icd);
833 WARN_ON(priv != file->private_data);
835 if (ici->ops->get_ctrl) {
836 ret = ici->ops->get_ctrl(icd, ctrl);
837 if (ret != -ENOIOCTLCMD)
841 return v4l2_subdev_call(sd, core, g_ctrl, ctrl);
844 static int soc_camera_s_ctrl(struct file *file, void *priv,
845 struct v4l2_control *ctrl)
847 struct soc_camera_device *icd = file->private_data;
848 struct soc_camera_host *ici = to_soc_camera_host(icd->dev.parent);
849 struct v4l2_subdev *sd = soc_camera_to_subdev(icd);
852 WARN_ON(priv != file->private_data);
854 if (ici->ops->set_ctrl) {
855 ret = ici->ops->set_ctrl(icd, ctrl);
856 if (ret != -ENOIOCTLCMD)
860 return v4l2_subdev_call(sd, core, s_ctrl, ctrl);
863 static int soc_camera_cropcap(struct file *file, void *fh,
864 struct v4l2_cropcap *a)
866 struct soc_camera_device *icd = file->private_data;
867 struct soc_camera_host *ici = to_soc_camera_host(icd->dev.parent);
869 return ici->ops->cropcap(icd, a);
872 static int soc_camera_g_crop(struct file *file, void *fh,
875 struct soc_camera_device *icd = file->private_data;
876 struct soc_camera_host *ici = to_soc_camera_host(icd->dev.parent);
879 ret = ici->ops->get_crop(icd, a);
885 * According to the V4L2 API, drivers shall not update the struct v4l2_crop
886 * argument with the actual geometry, instead, the user shall use G_CROP to
889 static int soc_camera_s_crop(struct file *file, void *fh,
892 struct soc_camera_device *icd = file->private_data;
893 struct soc_camera_host *ici = to_soc_camera_host(icd->dev.parent);
894 struct v4l2_rect *rect = &a->c;
895 struct v4l2_crop current_crop;
898 if (a->type != V4L2_BUF_TYPE_VIDEO_CAPTURE)
901 dev_dbg(&icd->dev, "S_CROP(%ux%u@%u:%u)\n",
902 rect->width, rect->height, rect->left, rect->top);
904 /* If get_crop fails, we'll let host and / or client drivers decide */
905 ret = ici->ops->get_crop(icd, ¤t_crop);
907 /* Prohibit window size change with initialised buffers */
910 "S_CROP denied: getting current crop failed\n");
911 } else if ((a->c.width == current_crop.c.width &&
912 a->c.height == current_crop.c.height) ||
913 !is_streaming(ici, icd)) {
914 /* same size or not streaming - use .set_crop() */
915 ret = ici->ops->set_crop(icd, a);
916 } else if (ici->ops->set_livecrop) {
917 ret = ici->ops->set_livecrop(icd, a);
920 "S_CROP denied: queue initialised and sizes differ\n");
927 static int soc_camera_g_parm(struct file *file, void *fh,
928 struct v4l2_streamparm *a)
930 struct soc_camera_device *icd = file->private_data;
931 struct soc_camera_host *ici = to_soc_camera_host(icd->dev.parent);
933 if (ici->ops->get_parm)
934 return ici->ops->get_parm(icd, a);
939 static int soc_camera_s_parm(struct file *file, void *fh,
940 struct v4l2_streamparm *a)
942 struct soc_camera_device *icd = file->private_data;
943 struct soc_camera_host *ici = to_soc_camera_host(icd->dev.parent);
945 if (ici->ops->set_parm)
946 return ici->ops->set_parm(icd, a);
951 static int soc_camera_g_chip_ident(struct file *file, void *fh,
952 struct v4l2_dbg_chip_ident *id)
954 struct soc_camera_device *icd = file->private_data;
955 struct v4l2_subdev *sd = soc_camera_to_subdev(icd);
957 return v4l2_subdev_call(sd, core, g_chip_ident, id);
960 #ifdef CONFIG_VIDEO_ADV_DEBUG
961 static int soc_camera_g_register(struct file *file, void *fh,
962 struct v4l2_dbg_register *reg)
964 struct soc_camera_device *icd = file->private_data;
965 struct v4l2_subdev *sd = soc_camera_to_subdev(icd);
967 return v4l2_subdev_call(sd, core, g_register, reg);
970 static int soc_camera_s_register(struct file *file, void *fh,
971 struct v4l2_dbg_register *reg)
973 struct soc_camera_device *icd = file->private_data;
974 struct v4l2_subdev *sd = soc_camera_to_subdev(icd);
976 return v4l2_subdev_call(sd, core, s_register, reg);
980 /* So far this function cannot fail */
981 static void scan_add_host(struct soc_camera_host *ici)
983 struct soc_camera_device *icd;
985 mutex_lock(&list_lock);
987 list_for_each_entry(icd, &devices, list) {
988 if (icd->iface == ici->nr) {
990 icd->dev.parent = ici->v4l2_dev.dev;
991 dev_set_name(&icd->dev, "%u-%u", icd->iface,
993 ret = device_register(&icd->dev);
995 icd->dev.parent = NULL;
997 "Cannot register device: %d\n", ret);
1002 mutex_unlock(&list_lock);
1005 #ifdef CONFIG_I2C_BOARDINFO
1006 static int soc_camera_init_i2c(struct soc_camera_device *icd,
1007 struct soc_camera_link *icl)
1009 struct i2c_client *client;
1010 struct soc_camera_host *ici = to_soc_camera_host(icd->dev.parent);
1011 struct i2c_adapter *adap = i2c_get_adapter(icl->i2c_adapter_id);
1012 struct v4l2_subdev *subdev;
1015 dev_err(&icd->dev, "Cannot get I2C adapter #%d. No driver?\n",
1016 icl->i2c_adapter_id);
1020 icl->board_info->platform_data = icd;
1022 subdev = v4l2_i2c_new_subdev_board(&ici->v4l2_dev, adap,
1023 icl->board_info, NULL);
1027 client = v4l2_get_subdevdata(subdev);
1029 /* Use to_i2c_client(dev) to recover the i2c client */
1030 dev_set_drvdata(&icd->dev, &client->dev);
1034 i2c_put_adapter(adap);
1039 static void soc_camera_free_i2c(struct soc_camera_device *icd)
1041 struct i2c_client *client =
1042 to_i2c_client(to_soc_camera_control(icd));
1043 struct i2c_adapter *adap = client->adapter;
1044 dev_set_drvdata(&icd->dev, NULL);
1045 v4l2_device_unregister_subdev(i2c_get_clientdata(client));
1046 i2c_unregister_device(client);
1047 i2c_put_adapter(adap);
1050 #define soc_camera_init_i2c(icd, icl) (-ENODEV)
1051 #define soc_camera_free_i2c(icd) do {} while (0)
1054 static int soc_camera_video_start(struct soc_camera_device *icd);
1055 static int video_dev_create(struct soc_camera_device *icd);
1056 /* Called during host-driver probe */
1057 static int soc_camera_probe(struct device *dev)
1059 struct soc_camera_device *icd = to_soc_camera_dev(dev);
1060 struct soc_camera_host *ici = to_soc_camera_host(dev->parent);
1061 struct soc_camera_link *icl = to_soc_camera_link(icd);
1062 struct device *control = NULL;
1063 struct v4l2_subdev *sd;
1064 struct v4l2_mbus_framefmt mf;
1067 dev_info(dev, "Probing %s\n", dev_name(dev));
1069 ret = regulator_bulk_get(icd->pdev, icl->num_regulators,
1074 ret = soc_camera_power_set(icd, icl, 1);
1078 /* The camera could have been already on, try to reset */
1080 icl->reset(icd->pdev);
1082 ret = ici->ops->add(icd);
1086 /* Must have icd->vdev before registering the device */
1087 ret = video_dev_create(icd);
1091 /* Non-i2c cameras, e.g., soc_camera_platform, have no board_info */
1092 if (icl->board_info) {
1093 ret = soc_camera_init_i2c(icd, icl);
1096 } else if (!icl->add_device || !icl->del_device) {
1100 if (icl->module_name)
1101 ret = request_module(icl->module_name);
1103 ret = icl->add_device(icl, &icd->dev);
1108 * FIXME: this is racy, have to use driver-binding notification,
1109 * when it is available
1111 control = to_soc_camera_control(icd);
1112 if (!control || !control->driver || !dev_get_drvdata(control) ||
1113 !try_module_get(control->driver->owner)) {
1114 icl->del_device(icl);
1119 sd = soc_camera_to_subdev(icd);
1120 sd->grp_id = (long)icd;
1122 /* At this point client .probe() should have run already */
1123 ret = soc_camera_init_user_formats(icd);
1127 icd->field = V4L2_FIELD_ANY;
1129 icd->vdev->lock = &icd->video_lock;
1132 * ..._video_start() will create a device node, video_register_device()
1133 * itself is protected against concurrent open() calls, but we also have
1134 * to protect our data.
1136 mutex_lock(&icd->video_lock);
1138 ret = soc_camera_video_start(icd);
1142 /* Try to improve our guess of a reasonable window format */
1143 if (!v4l2_subdev_call(sd, video, g_mbus_fmt, &mf)) {
1144 icd->user_width = mf.width;
1145 icd->user_height = mf.height;
1146 icd->colorspace = mf.colorspace;
1147 icd->field = mf.field;
1150 /* Do we have to sysfs_remove_link() before device_unregister()? */
1151 if (sysfs_create_link(&icd->dev.kobj, &to_soc_camera_control(icd)->kobj,
1153 dev_warn(&icd->dev, "Failed creating the control symlink\n");
1155 ici->ops->remove(icd);
1157 soc_camera_power_set(icd, icl, 0);
1159 mutex_unlock(&icd->video_lock);
1164 mutex_unlock(&icd->video_lock);
1165 soc_camera_free_user_formats(icd);
1167 if (icl->board_info) {
1168 soc_camera_free_i2c(icd);
1170 icl->del_device(icl);
1171 module_put(control->driver->owner);
1175 video_device_release(icd->vdev);
1177 ici->ops->remove(icd);
1179 soc_camera_power_set(icd, icl, 0);
1181 regulator_bulk_free(icl->num_regulators, icl->regulators);
1187 * This is called on device_unregister, which only means we have to disconnect
1188 * from the host, but not remove ourselves from the device list
1190 static int soc_camera_remove(struct device *dev)
1192 struct soc_camera_device *icd = to_soc_camera_dev(dev);
1193 struct soc_camera_link *icl = to_soc_camera_link(icd);
1194 struct video_device *vdev = icd->vdev;
1196 BUG_ON(!dev->parent);
1199 video_unregister_device(vdev);
1203 if (icl->board_info) {
1204 soc_camera_free_i2c(icd);
1206 struct device_driver *drv = to_soc_camera_control(icd) ?
1207 to_soc_camera_control(icd)->driver : NULL;
1209 icl->del_device(icl);
1210 module_put(drv->owner);
1213 soc_camera_free_user_formats(icd);
1215 regulator_bulk_free(icl->num_regulators, icl->regulators);
1220 static int soc_camera_suspend(struct device *dev, pm_message_t state)
1222 struct soc_camera_device *icd = to_soc_camera_dev(dev);
1223 struct soc_camera_host *ici = to_soc_camera_host(icd->dev.parent);
1226 if (ici->ops->suspend)
1227 ret = ici->ops->suspend(icd, state);
1232 static int soc_camera_resume(struct device *dev)
1234 struct soc_camera_device *icd = to_soc_camera_dev(dev);
1235 struct soc_camera_host *ici = to_soc_camera_host(icd->dev.parent);
1238 if (ici->ops->resume)
1239 ret = ici->ops->resume(icd);
1244 struct bus_type soc_camera_bus_type = {
1245 .name = "soc-camera",
1246 .probe = soc_camera_probe,
1247 .remove = soc_camera_remove,
1248 .suspend = soc_camera_suspend,
1249 .resume = soc_camera_resume,
1251 EXPORT_SYMBOL_GPL(soc_camera_bus_type);
1253 static struct device_driver ic_drv = {
1255 .bus = &soc_camera_bus_type,
1256 .owner = THIS_MODULE,
1259 static void dummy_release(struct device *dev)
1263 static int default_cropcap(struct soc_camera_device *icd,
1264 struct v4l2_cropcap *a)
1266 struct v4l2_subdev *sd = soc_camera_to_subdev(icd);
1267 return v4l2_subdev_call(sd, video, cropcap, a);
1270 static int default_g_crop(struct soc_camera_device *icd, struct v4l2_crop *a)
1272 struct v4l2_subdev *sd = soc_camera_to_subdev(icd);
1273 return v4l2_subdev_call(sd, video, g_crop, a);
1276 static int default_s_crop(struct soc_camera_device *icd, struct v4l2_crop *a)
1278 struct v4l2_subdev *sd = soc_camera_to_subdev(icd);
1279 return v4l2_subdev_call(sd, video, s_crop, a);
1282 static int default_g_parm(struct soc_camera_device *icd,
1283 struct v4l2_streamparm *parm)
1285 struct v4l2_subdev *sd = soc_camera_to_subdev(icd);
1286 return v4l2_subdev_call(sd, video, g_parm, parm);
1289 static int default_s_parm(struct soc_camera_device *icd,
1290 struct v4l2_streamparm *parm)
1292 struct v4l2_subdev *sd = soc_camera_to_subdev(icd);
1293 return v4l2_subdev_call(sd, video, s_parm, parm);
1296 static int default_enum_fsizes(struct soc_camera_device *icd,
1297 struct v4l2_frmsizeenum *fsize)
1300 struct v4l2_subdev *sd = soc_camera_to_subdev(icd);
1301 const struct soc_camera_format_xlate *xlate;
1302 __u32 pixfmt = fsize->pixel_format;
1303 struct v4l2_frmsizeenum fsize_mbus = *fsize;
1305 xlate = soc_camera_xlate_by_fourcc(icd, pixfmt);
1308 /* map xlate-code to pixel_format, sensor only handle xlate-code*/
1309 fsize_mbus.pixel_format = xlate->code;
1311 ret = v4l2_subdev_call(sd, video, enum_mbus_fsizes, &fsize_mbus);
1315 *fsize = fsize_mbus;
1316 fsize->pixel_format = pixfmt;
1321 static void soc_camera_device_init(struct device *dev, void *pdata)
1323 dev->platform_data = pdata;
1324 dev->bus = &soc_camera_bus_type;
1325 dev->release = dummy_release;
1328 int soc_camera_host_register(struct soc_camera_host *ici)
1330 struct soc_camera_host *ix;
1333 if (!ici || !ici->ops ||
1334 !ici->ops->try_fmt ||
1335 !ici->ops->set_fmt ||
1336 !ici->ops->set_bus_param ||
1337 !ici->ops->querycap ||
1338 ((!ici->ops->init_videobuf ||
1339 !ici->ops->reqbufs) &&
1340 !ici->ops->init_videobuf2) ||
1342 !ici->ops->remove ||
1347 if (!ici->ops->set_crop)
1348 ici->ops->set_crop = default_s_crop;
1349 if (!ici->ops->get_crop)
1350 ici->ops->get_crop = default_g_crop;
1351 if (!ici->ops->cropcap)
1352 ici->ops->cropcap = default_cropcap;
1353 if (!ici->ops->set_parm)
1354 ici->ops->set_parm = default_s_parm;
1355 if (!ici->ops->get_parm)
1356 ici->ops->get_parm = default_g_parm;
1357 if (!ici->ops->enum_fsizes)
1358 ici->ops->enum_fsizes = default_enum_fsizes;
1360 mutex_lock(&list_lock);
1361 list_for_each_entry(ix, &hosts, list) {
1362 if (ix->nr == ici->nr) {
1368 ret = v4l2_device_register(ici->v4l2_dev.dev, &ici->v4l2_dev);
1372 list_add_tail(&ici->list, &hosts);
1373 mutex_unlock(&list_lock);
1380 mutex_unlock(&list_lock);
1383 EXPORT_SYMBOL(soc_camera_host_register);
1385 /* Unregister all clients! */
1386 void soc_camera_host_unregister(struct soc_camera_host *ici)
1388 struct soc_camera_device *icd;
1390 mutex_lock(&list_lock);
1392 list_del(&ici->list);
1394 list_for_each_entry(icd, &devices, list) {
1395 if (icd->iface == ici->nr) {
1396 void *pdata = icd->dev.platform_data;
1397 /* The bus->remove will be called */
1398 device_unregister(&icd->dev);
1400 * Not before device_unregister(), .remove
1401 * needs parent to call ici->ops->remove().
1402 * If the host module is loaded again, device_register()
1403 * would complain "already initialised," since 2.6.32
1404 * this is also needed to prevent use-after-free of the
1405 * device private data.
1407 memset(&icd->dev, 0, sizeof(icd->dev));
1408 soc_camera_device_init(&icd->dev, pdata);
1412 mutex_unlock(&list_lock);
1414 v4l2_device_unregister(&ici->v4l2_dev);
1416 EXPORT_SYMBOL(soc_camera_host_unregister);
1418 /* Image capture device */
1419 static int soc_camera_device_register(struct soc_camera_device *icd)
1421 struct soc_camera_device *ix;
1424 for (i = 0; i < 256 && num < 0; i++) {
1426 /* Check if this index is available on this interface */
1427 list_for_each_entry(ix, &devices, list) {
1428 if (ix->iface == icd->iface && ix->devnum == i) {
1437 * ok, we have 256 cameras on this host...
1438 * man, stay reasonable...
1444 icd->host_priv = NULL;
1445 mutex_init(&icd->video_lock);
1447 list_add_tail(&icd->list, &devices);
1452 static void soc_camera_device_unregister(struct soc_camera_device *icd)
1454 list_del(&icd->list);
1457 static const struct v4l2_ioctl_ops soc_camera_ioctl_ops = {
1458 .vidioc_querycap = soc_camera_querycap,
1459 .vidioc_g_fmt_vid_cap = soc_camera_g_fmt_vid_cap,
1460 .vidioc_enum_fmt_vid_cap = soc_camera_enum_fmt_vid_cap,
1461 .vidioc_s_fmt_vid_cap = soc_camera_s_fmt_vid_cap,
1462 .vidioc_enum_input = soc_camera_enum_input,
1463 .vidioc_g_input = soc_camera_g_input,
1464 .vidioc_s_input = soc_camera_s_input,
1465 .vidioc_s_std = soc_camera_s_std,
1466 .vidioc_enum_framesizes = soc_camera_enum_fsizes,
1467 .vidioc_reqbufs = soc_camera_reqbufs,
1468 .vidioc_try_fmt_vid_cap = soc_camera_try_fmt_vid_cap,
1469 .vidioc_querybuf = soc_camera_querybuf,
1470 .vidioc_qbuf = soc_camera_qbuf,
1471 .vidioc_dqbuf = soc_camera_dqbuf,
1472 .vidioc_streamon = soc_camera_streamon,
1473 .vidioc_streamoff = soc_camera_streamoff,
1474 .vidioc_queryctrl = soc_camera_queryctrl,
1475 .vidioc_g_ctrl = soc_camera_g_ctrl,
1476 .vidioc_s_ctrl = soc_camera_s_ctrl,
1477 .vidioc_cropcap = soc_camera_cropcap,
1478 .vidioc_g_crop = soc_camera_g_crop,
1479 .vidioc_s_crop = soc_camera_s_crop,
1480 .vidioc_g_parm = soc_camera_g_parm,
1481 .vidioc_s_parm = soc_camera_s_parm,
1482 .vidioc_g_chip_ident = soc_camera_g_chip_ident,
1483 #ifdef CONFIG_VIDEO_ADV_DEBUG
1484 .vidioc_g_register = soc_camera_g_register,
1485 .vidioc_s_register = soc_camera_s_register,
1489 static int video_dev_create(struct soc_camera_device *icd)
1491 struct soc_camera_host *ici = to_soc_camera_host(icd->dev.parent);
1492 struct video_device *vdev = video_device_alloc();
1497 strlcpy(vdev->name, ici->drv_name, sizeof(vdev->name));
1499 vdev->parent = &icd->dev;
1500 vdev->current_norm = V4L2_STD_UNKNOWN;
1501 vdev->fops = &soc_camera_fops;
1502 vdev->ioctl_ops = &soc_camera_ioctl_ops;
1503 vdev->release = video_device_release;
1504 vdev->tvnorms = V4L2_STD_UNKNOWN;
1512 * Called from soc_camera_probe() above (with .video_lock held???)
1514 static int soc_camera_video_start(struct soc_camera_device *icd)
1516 struct device_type *type = icd->vdev->dev.type;
1519 if (!icd->dev.parent)
1523 !icd->ops->query_bus_param ||
1524 !icd->ops->set_bus_param)
1527 ret = video_register_device(icd->vdev, VFL_TYPE_GRABBER, -1);
1529 dev_err(&icd->dev, "video_register_device failed: %d\n", ret);
1533 /* Restore device type, possibly set by the subdevice driver */
1534 icd->vdev->dev.type = type;
1539 static int __devinit soc_camera_pdrv_probe(struct platform_device *pdev)
1541 struct soc_camera_link *icl = pdev->dev.platform_data;
1542 struct soc_camera_device *icd;
1548 icd = kzalloc(sizeof(*icd), GFP_KERNEL);
1552 icd->iface = icl->bus_id;
1553 icd->pdev = &pdev->dev;
1554 platform_set_drvdata(pdev, icd);
1556 ret = soc_camera_device_register(icd);
1560 soc_camera_device_init(&icd->dev, icl);
1562 icd->user_width = DEFAULT_WIDTH;
1563 icd->user_height = DEFAULT_HEIGHT;
1574 * Only called on rmmod for each platform device, since they are not
1575 * hot-pluggable. Now we know, that all our users - hosts and devices have
1576 * been unloaded already
1578 static int __devexit soc_camera_pdrv_remove(struct platform_device *pdev)
1580 struct soc_camera_device *icd = platform_get_drvdata(pdev);
1585 soc_camera_device_unregister(icd);
1592 static struct platform_driver __refdata soc_camera_pdrv = {
1593 .remove = __devexit_p(soc_camera_pdrv_remove),
1595 .name = "soc-camera-pdrv",
1596 .owner = THIS_MODULE,
1600 static int __init soc_camera_init(void)
1602 int ret = bus_register(&soc_camera_bus_type);
1605 ret = driver_register(&ic_drv);
1609 ret = platform_driver_probe(&soc_camera_pdrv, soc_camera_pdrv_probe);
1616 driver_unregister(&ic_drv);
1618 bus_unregister(&soc_camera_bus_type);
1622 static void __exit soc_camera_exit(void)
1624 platform_driver_unregister(&soc_camera_pdrv);
1625 driver_unregister(&ic_drv);
1626 bus_unregister(&soc_camera_bus_type);
1629 module_init(soc_camera_init);
1630 module_exit(soc_camera_exit);
1632 MODULE_DESCRIPTION("Image capture bus driver");
1633 MODULE_AUTHOR("Guennadi Liakhovetski <kernel@pengutronix.de>");
1634 MODULE_LICENSE("GPL");
1635 MODULE_ALIAS("platform:soc-camera-pdrv");