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/vmalloc.h>
30 #include <media/soc_camera.h>
31 #include <media/v4l2-common.h>
32 #include <media/v4l2-ioctl.h>
33 #include <media/v4l2-dev.h>
34 #include <media/videobuf-core.h>
35 #include <media/soc_mediabus.h>
37 /* Default to VGA resolution */
38 #define DEFAULT_WIDTH 640
39 #define DEFAULT_HEIGHT 480
41 static LIST_HEAD(hosts);
42 static LIST_HEAD(devices);
43 static DEFINE_MUTEX(list_lock); /* Protects the list of hosts */
45 const struct soc_camera_format_xlate *soc_camera_xlate_by_fourcc(
46 struct soc_camera_device *icd, unsigned int fourcc)
50 for (i = 0; i < icd->num_user_formats; i++)
51 if (icd->user_formats[i].host_fmt->fourcc == fourcc)
52 return icd->user_formats + i;
55 EXPORT_SYMBOL(soc_camera_xlate_by_fourcc);
58 * soc_camera_apply_sensor_flags() - apply platform SOCAM_SENSOR_INVERT_* flags
59 * @icl: camera platform parameters
60 * @flags: flags to be inverted according to platform configuration
61 * @return: resulting flags
63 unsigned long soc_camera_apply_sensor_flags(struct soc_camera_link *icl,
68 /* If only one of the two polarities is supported, switch to the opposite */
69 if (icl->flags & SOCAM_SENSOR_INVERT_HSYNC) {
70 f = flags & (SOCAM_HSYNC_ACTIVE_HIGH | SOCAM_HSYNC_ACTIVE_LOW);
71 if (f == SOCAM_HSYNC_ACTIVE_HIGH || f == SOCAM_HSYNC_ACTIVE_LOW)
72 flags ^= SOCAM_HSYNC_ACTIVE_HIGH | SOCAM_HSYNC_ACTIVE_LOW;
75 if (icl->flags & SOCAM_SENSOR_INVERT_VSYNC) {
76 f = flags & (SOCAM_VSYNC_ACTIVE_HIGH | SOCAM_VSYNC_ACTIVE_LOW);
77 if (f == SOCAM_VSYNC_ACTIVE_HIGH || f == SOCAM_VSYNC_ACTIVE_LOW)
78 flags ^= SOCAM_VSYNC_ACTIVE_HIGH | SOCAM_VSYNC_ACTIVE_LOW;
81 if (icl->flags & SOCAM_SENSOR_INVERT_PCLK) {
82 f = flags & (SOCAM_PCLK_SAMPLE_RISING | SOCAM_PCLK_SAMPLE_FALLING);
83 if (f == SOCAM_PCLK_SAMPLE_RISING || f == SOCAM_PCLK_SAMPLE_FALLING)
84 flags ^= SOCAM_PCLK_SAMPLE_RISING | SOCAM_PCLK_SAMPLE_FALLING;
89 EXPORT_SYMBOL(soc_camera_apply_sensor_flags);
91 static int soc_camera_try_fmt_vid_cap(struct file *file, void *priv,
92 struct v4l2_format *f)
94 struct soc_camera_file *icf = file->private_data;
95 struct soc_camera_device *icd = icf->icd;
96 struct soc_camera_host *ici = to_soc_camera_host(icd->dev.parent);
98 WARN_ON(priv != file->private_data);
100 /* limit format to hardware capabilities */
101 return ici->ops->try_fmt(icd, f);
104 static int soc_camera_enum_input(struct file *file, void *priv,
105 struct v4l2_input *inp)
107 struct soc_camera_file *icf = file->private_data;
108 struct soc_camera_device *icd = icf->icd;
114 if (icd->ops->enum_input)
115 ret = icd->ops->enum_input(icd, inp);
117 /* default is camera */
118 inp->type = V4L2_INPUT_TYPE_CAMERA;
119 inp->std = V4L2_STD_UNKNOWN;
120 strcpy(inp->name, "Camera");
126 static int soc_camera_g_input(struct file *file, void *priv, unsigned int *i)
133 static int soc_camera_s_input(struct file *file, void *priv, unsigned int i)
141 static int soc_camera_s_std(struct file *file, void *priv, v4l2_std_id *a)
143 struct soc_camera_file *icf = file->private_data;
144 struct soc_camera_device *icd = icf->icd;
145 struct v4l2_subdev *sd = soc_camera_to_subdev(icd);
147 return v4l2_subdev_call(sd, core, s_std, *a);
150 static int soc_camera_reqbufs(struct file *file, void *priv,
151 struct v4l2_requestbuffers *p)
154 struct soc_camera_file *icf = file->private_data;
155 struct soc_camera_device *icd = icf->icd;
156 struct soc_camera_host *ici = to_soc_camera_host(icd->dev.parent);
158 WARN_ON(priv != file->private_data);
160 ret = videobuf_reqbufs(&icf->vb_vidq, p);
164 return ici->ops->reqbufs(icf, p);
167 static int soc_camera_querybuf(struct file *file, void *priv,
168 struct v4l2_buffer *p)
170 struct soc_camera_file *icf = file->private_data;
172 WARN_ON(priv != file->private_data);
174 return videobuf_querybuf(&icf->vb_vidq, p);
177 static int soc_camera_qbuf(struct file *file, void *priv,
178 struct v4l2_buffer *p)
180 struct soc_camera_file *icf = file->private_data;
182 WARN_ON(priv != file->private_data);
184 return videobuf_qbuf(&icf->vb_vidq, p);
187 static int soc_camera_dqbuf(struct file *file, void *priv,
188 struct v4l2_buffer *p)
190 struct soc_camera_file *icf = file->private_data;
192 WARN_ON(priv != file->private_data);
194 return videobuf_dqbuf(&icf->vb_vidq, p, file->f_flags & O_NONBLOCK);
197 /* Always entered with .video_lock held */
198 static int soc_camera_init_user_formats(struct soc_camera_device *icd)
200 struct v4l2_subdev *sd = soc_camera_to_subdev(icd);
201 struct soc_camera_host *ici = to_soc_camera_host(icd->dev.parent);
202 int i, fmts = 0, raw_fmts = 0, ret;
203 enum v4l2_mbus_pixelcode code;
205 while (!v4l2_subdev_call(sd, video, enum_mbus_fmt, raw_fmts, &code))
208 if (!ici->ops->get_formats)
210 * Fallback mode - the host will have to serve all
211 * sensor-provided formats one-to-one to the user
216 * First pass - only count formats this host-sensor
217 * configuration can provide
219 for (i = 0; i < raw_fmts; i++) {
220 ret = ici->ops->get_formats(icd, i, NULL);
230 vmalloc(fmts * sizeof(struct soc_camera_format_xlate));
231 if (!icd->user_formats)
234 icd->num_user_formats = fmts;
236 dev_dbg(&icd->dev, "Found %d supported formats.\n", fmts);
238 /* Second pass - actually fill data formats */
240 for (i = 0; i < raw_fmts; i++)
241 if (!ici->ops->get_formats) {
242 v4l2_subdev_call(sd, video, enum_mbus_fmt, i, &code);
243 icd->user_formats[i].host_fmt =
244 soc_mbus_get_fmtdesc(code);
245 icd->user_formats[i].code = code;
247 ret = ici->ops->get_formats(icd, i,
248 &icd->user_formats[fmts]);
254 icd->current_fmt = &icd->user_formats[0];
259 icd->num_user_formats = 0;
260 vfree(icd->user_formats);
264 /* Always entered with .video_lock held */
265 static void soc_camera_free_user_formats(struct soc_camera_device *icd)
267 struct soc_camera_host *ici = to_soc_camera_host(icd->dev.parent);
269 if (ici->ops->put_formats)
270 ici->ops->put_formats(icd);
271 icd->current_fmt = NULL;
272 icd->num_user_formats = 0;
273 vfree(icd->user_formats);
274 icd->user_formats = NULL;
277 #define pixfmtstr(x) (x) & 0xff, ((x) >> 8) & 0xff, ((x) >> 16) & 0xff, \
280 /* Called with .vb_lock held, or from the first open(2), see comment there */
281 static int soc_camera_set_fmt(struct soc_camera_file *icf,
282 struct v4l2_format *f)
284 struct soc_camera_device *icd = icf->icd;
285 struct soc_camera_host *ici = to_soc_camera_host(icd->dev.parent);
286 struct v4l2_pix_format *pix = &f->fmt.pix;
289 dev_dbg(&icd->dev, "S_FMT(%c%c%c%c, %ux%u)\n",
290 pixfmtstr(pix->pixelformat), pix->width, pix->height);
292 /* We always call try_fmt() before set_fmt() or set_crop() */
293 ret = ici->ops->try_fmt(icd, f);
297 ret = ici->ops->set_fmt(icd, f);
300 } else if (!icd->current_fmt ||
301 icd->current_fmt->host_fmt->fourcc != pix->pixelformat) {
303 "Host driver hasn't set up current format correctly!\n");
307 icd->user_width = pix->width;
308 icd->user_height = pix->height;
309 icd->colorspace = pix->colorspace;
311 icd->field = pix->field;
313 if (f->type != V4L2_BUF_TYPE_VIDEO_CAPTURE)
314 dev_warn(&icd->dev, "Attention! Wrong buf-type %d\n",
317 dev_dbg(&icd->dev, "set width: %d height: %d\n",
318 icd->user_width, icd->user_height);
320 /* set physical bus parameters */
321 return ici->ops->set_bus_param(icd, pix->pixelformat);
324 static int soc_camera_open(struct file *file)
326 struct video_device *vdev = video_devdata(file);
327 struct soc_camera_device *icd = container_of(vdev->parent,
328 struct soc_camera_device,
330 struct soc_camera_link *icl = to_soc_camera_link(icd);
331 struct soc_camera_host *ici;
332 struct soc_camera_file *icf;
336 /* No device driver attached */
339 ici = to_soc_camera_host(icd->dev.parent);
341 icf = vmalloc(sizeof(*icf));
345 if (!try_module_get(ici->ops->owner)) {
346 dev_err(&icd->dev, "Couldn't lock capture bus driver.\n");
352 * Protect against icd->ops->remove() until we module_get() both
355 mutex_lock(&icd->video_lock);
360 /* Now we really have to activate the camera */
361 if (icd->use_count == 1) {
362 /* Restore parameters before the last close() per V4L2 API */
363 struct v4l2_format f = {
364 .type = V4L2_BUF_TYPE_VIDEO_CAPTURE,
366 .width = icd->user_width,
367 .height = icd->user_height,
369 .colorspace = icd->colorspace,
371 icd->current_fmt->host_fmt->fourcc,
376 ret = icl->power(icd->pdev, 1);
381 /* The camera could have been already on, try to reset */
383 icl->reset(icd->pdev);
385 ret = ici->ops->add(icd);
387 dev_err(&icd->dev, "Couldn't activate the camera: %d\n", ret);
392 * Try to configure with default parameters. Notice: this is the
393 * very first open, so, we cannot race against other calls,
394 * apart from someone else calling open() simultaneously, but
395 * .video_lock is protecting us against it.
397 ret = soc_camera_set_fmt(icf, &f);
402 file->private_data = icf;
403 dev_dbg(&icd->dev, "camera device open\n");
405 ici->ops->init_videobuf(&icf->vb_vidq, icd);
407 mutex_unlock(&icd->video_lock);
412 * First five errors are entered with the .video_lock held
416 ici->ops->remove(icd);
419 icl->power(icd->pdev, 0);
422 mutex_unlock(&icd->video_lock);
423 module_put(ici->ops->owner);
429 static int soc_camera_close(struct file *file)
431 struct soc_camera_file *icf = file->private_data;
432 struct soc_camera_device *icd = icf->icd;
433 struct soc_camera_host *ici = to_soc_camera_host(icd->dev.parent);
435 mutex_lock(&icd->video_lock);
437 if (!icd->use_count) {
438 struct soc_camera_link *icl = to_soc_camera_link(icd);
440 ici->ops->remove(icd);
442 icl->power(icd->pdev, 0);
445 mutex_unlock(&icd->video_lock);
447 module_put(ici->ops->owner);
451 dev_dbg(&icd->dev, "camera device close\n");
456 static ssize_t soc_camera_read(struct file *file, char __user *buf,
457 size_t count, loff_t *ppos)
459 struct soc_camera_file *icf = file->private_data;
460 struct soc_camera_device *icd = icf->icd;
463 dev_err(&icd->dev, "camera device read not implemented\n");
468 static int soc_camera_mmap(struct file *file, struct vm_area_struct *vma)
470 struct soc_camera_file *icf = file->private_data;
471 struct soc_camera_device *icd = icf->icd;
474 dev_dbg(&icd->dev, "mmap called, vma=0x%08lx\n", (unsigned long)vma);
476 err = videobuf_mmap_mapper(&icf->vb_vidq, vma);
478 dev_dbg(&icd->dev, "vma start=0x%08lx, size=%ld, ret=%d\n",
479 (unsigned long)vma->vm_start,
480 (unsigned long)vma->vm_end - (unsigned long)vma->vm_start,
486 static unsigned int soc_camera_poll(struct file *file, poll_table *pt)
488 struct soc_camera_file *icf = file->private_data;
489 struct soc_camera_device *icd = icf->icd;
490 struct soc_camera_host *ici = to_soc_camera_host(icd->dev.parent);
492 if (list_empty(&icf->vb_vidq.stream)) {
493 dev_err(&icd->dev, "Trying to poll with no queued buffers!\n");
497 return ici->ops->poll(file, pt);
500 static struct v4l2_file_operations soc_camera_fops = {
501 .owner = THIS_MODULE,
502 .open = soc_camera_open,
503 .release = soc_camera_close,
504 .ioctl = video_ioctl2,
505 .read = soc_camera_read,
506 .mmap = soc_camera_mmap,
507 .poll = soc_camera_poll,
510 static int soc_camera_s_fmt_vid_cap(struct file *file, void *priv,
511 struct v4l2_format *f)
513 struct soc_camera_file *icf = file->private_data;
514 struct soc_camera_device *icd = icf->icd;
517 WARN_ON(priv != file->private_data);
519 mutex_lock(&icf->vb_vidq.vb_lock);
521 if (icf->vb_vidq.bufs[0]) {
522 dev_err(&icd->dev, "S_FMT denied: queue initialised\n");
527 ret = soc_camera_set_fmt(icf, f);
530 mutex_unlock(&icf->vb_vidq.vb_lock);
535 static int soc_camera_enum_fmt_vid_cap(struct file *file, void *priv,
536 struct v4l2_fmtdesc *f)
538 struct soc_camera_file *icf = file->private_data;
539 struct soc_camera_device *icd = icf->icd;
540 const struct soc_mbus_pixelfmt *format;
542 WARN_ON(priv != file->private_data);
544 if (f->index >= icd->num_user_formats)
547 format = icd->user_formats[f->index].host_fmt;
550 strlcpy(f->description, format->name, sizeof(f->description));
551 f->pixelformat = format->fourcc;
555 static int soc_camera_g_fmt_vid_cap(struct file *file, void *priv,
556 struct v4l2_format *f)
558 struct soc_camera_file *icf = file->private_data;
559 struct soc_camera_device *icd = icf->icd;
560 struct v4l2_pix_format *pix = &f->fmt.pix;
562 WARN_ON(priv != file->private_data);
564 pix->width = icd->user_width;
565 pix->height = icd->user_height;
566 pix->field = icf->vb_vidq.field;
567 pix->pixelformat = icd->current_fmt->host_fmt->fourcc;
568 pix->bytesperline = soc_mbus_bytes_per_line(pix->width,
569 icd->current_fmt->host_fmt);
570 pix->colorspace = icd->colorspace;
571 if (pix->bytesperline < 0)
572 return pix->bytesperline;
573 pix->sizeimage = pix->height * pix->bytesperline;
574 dev_dbg(&icd->dev, "current_fmt->fourcc: 0x%08x\n",
575 icd->current_fmt->host_fmt->fourcc);
579 static int soc_camera_querycap(struct file *file, void *priv,
580 struct v4l2_capability *cap)
582 struct soc_camera_file *icf = file->private_data;
583 struct soc_camera_device *icd = icf->icd;
584 struct soc_camera_host *ici = to_soc_camera_host(icd->dev.parent);
586 WARN_ON(priv != file->private_data);
588 strlcpy(cap->driver, ici->drv_name, sizeof(cap->driver));
589 return ici->ops->querycap(ici, cap);
592 static int soc_camera_streamon(struct file *file, void *priv,
593 enum v4l2_buf_type i)
595 struct soc_camera_file *icf = file->private_data;
596 struct soc_camera_device *icd = icf->icd;
597 struct v4l2_subdev *sd = soc_camera_to_subdev(icd);
600 WARN_ON(priv != file->private_data);
602 if (i != V4L2_BUF_TYPE_VIDEO_CAPTURE)
605 mutex_lock(&icd->video_lock);
607 v4l2_subdev_call(sd, video, s_stream, 1);
609 /* This calls buf_queue from host driver's videobuf_queue_ops */
610 ret = videobuf_streamon(&icf->vb_vidq);
612 mutex_unlock(&icd->video_lock);
617 static int soc_camera_streamoff(struct file *file, void *priv,
618 enum v4l2_buf_type i)
620 struct soc_camera_file *icf = file->private_data;
621 struct soc_camera_device *icd = icf->icd;
622 struct v4l2_subdev *sd = soc_camera_to_subdev(icd);
624 WARN_ON(priv != file->private_data);
626 if (i != V4L2_BUF_TYPE_VIDEO_CAPTURE)
629 mutex_lock(&icd->video_lock);
632 * This calls buf_release from host driver's videobuf_queue_ops for all
633 * remaining buffers. When the last buffer is freed, stop capture
635 videobuf_streamoff(&icf->vb_vidq);
637 v4l2_subdev_call(sd, video, s_stream, 0);
639 mutex_unlock(&icd->video_lock);
644 static int soc_camera_queryctrl(struct file *file, void *priv,
645 struct v4l2_queryctrl *qc)
647 struct soc_camera_file *icf = file->private_data;
648 struct soc_camera_device *icd = icf->icd;
649 struct soc_camera_host *ici = to_soc_camera_host(icd->dev.parent);
652 WARN_ON(priv != file->private_data);
657 /* First check host controls */
658 for (i = 0; i < ici->ops->num_controls; i++)
659 if (qc->id == ici->ops->controls[i].id) {
660 memcpy(qc, &(ici->ops->controls[i]),
665 /* Then device controls */
666 for (i = 0; i < icd->ops->num_controls; i++)
667 if (qc->id == icd->ops->controls[i].id) {
668 memcpy(qc, &(icd->ops->controls[i]),
676 static int soc_camera_g_ctrl(struct file *file, void *priv,
677 struct v4l2_control *ctrl)
679 struct soc_camera_file *icf = file->private_data;
680 struct soc_camera_device *icd = icf->icd;
681 struct soc_camera_host *ici = to_soc_camera_host(icd->dev.parent);
682 struct v4l2_subdev *sd = soc_camera_to_subdev(icd);
685 WARN_ON(priv != file->private_data);
687 if (ici->ops->get_ctrl) {
688 ret = ici->ops->get_ctrl(icd, ctrl);
689 if (ret != -ENOIOCTLCMD)
693 return v4l2_subdev_call(sd, core, g_ctrl, ctrl);
696 static int soc_camera_s_ctrl(struct file *file, void *priv,
697 struct v4l2_control *ctrl)
699 struct soc_camera_file *icf = file->private_data;
700 struct soc_camera_device *icd = icf->icd;
701 struct soc_camera_host *ici = to_soc_camera_host(icd->dev.parent);
702 struct v4l2_subdev *sd = soc_camera_to_subdev(icd);
705 WARN_ON(priv != file->private_data);
707 if (ici->ops->set_ctrl) {
708 ret = ici->ops->set_ctrl(icd, ctrl);
709 if (ret != -ENOIOCTLCMD)
713 return v4l2_subdev_call(sd, core, s_ctrl, ctrl);
716 static int soc_camera_cropcap(struct file *file, void *fh,
717 struct v4l2_cropcap *a)
719 struct soc_camera_file *icf = file->private_data;
720 struct soc_camera_device *icd = icf->icd;
721 struct soc_camera_host *ici = to_soc_camera_host(icd->dev.parent);
723 return ici->ops->cropcap(icd, a);
726 static int soc_camera_g_crop(struct file *file, void *fh,
729 struct soc_camera_file *icf = file->private_data;
730 struct soc_camera_device *icd = icf->icd;
731 struct soc_camera_host *ici = to_soc_camera_host(icd->dev.parent);
734 mutex_lock(&icf->vb_vidq.vb_lock);
735 ret = ici->ops->get_crop(icd, a);
736 mutex_unlock(&icf->vb_vidq.vb_lock);
742 * According to the V4L2 API, drivers shall not update the struct v4l2_crop
743 * argument with the actual geometry, instead, the user shall use G_CROP to
744 * retrieve it. However, we expect camera host and client drivers to update
745 * the argument, which we then use internally, but do not return to the user.
747 static int soc_camera_s_crop(struct file *file, void *fh,
750 struct soc_camera_file *icf = file->private_data;
751 struct soc_camera_device *icd = icf->icd;
752 struct soc_camera_host *ici = to_soc_camera_host(icd->dev.parent);
753 struct v4l2_rect *rect = &a->c;
754 struct v4l2_crop current_crop;
757 if (a->type != V4L2_BUF_TYPE_VIDEO_CAPTURE)
760 dev_dbg(&icd->dev, "S_CROP(%ux%u@%u:%u)\n",
761 rect->width, rect->height, rect->left, rect->top);
763 /* Cropping is allowed during a running capture, guard consistency */
764 mutex_lock(&icf->vb_vidq.vb_lock);
766 /* If get_crop fails, we'll let host and / or client drivers decide */
767 ret = ici->ops->get_crop(icd, ¤t_crop);
769 /* Prohibit window size change with initialised buffers */
770 if (icf->vb_vidq.bufs[0] && !ret &&
771 (a->c.width != current_crop.c.width ||
772 a->c.height != current_crop.c.height)) {
774 "S_CROP denied: queue initialised and sizes differ\n");
777 ret = ici->ops->set_crop(icd, a);
780 mutex_unlock(&icf->vb_vidq.vb_lock);
785 static int soc_camera_g_parm(struct file *file, void *fh,
786 struct v4l2_streamparm *a)
788 struct soc_camera_file *icf = file->private_data;
789 struct soc_camera_device *icd = icf->icd;
790 struct soc_camera_host *ici = to_soc_camera_host(icd->dev.parent);
792 if (ici->ops->get_parm)
793 return ici->ops->get_parm(icd, a);
798 static int soc_camera_s_parm(struct file *file, void *fh,
799 struct v4l2_streamparm *a)
801 struct soc_camera_file *icf = file->private_data;
802 struct soc_camera_device *icd = icf->icd;
803 struct soc_camera_host *ici = to_soc_camera_host(icd->dev.parent);
805 if (ici->ops->set_parm)
806 return ici->ops->set_parm(icd, a);
811 static int soc_camera_g_chip_ident(struct file *file, void *fh,
812 struct v4l2_dbg_chip_ident *id)
814 struct soc_camera_file *icf = file->private_data;
815 struct soc_camera_device *icd = icf->icd;
816 struct v4l2_subdev *sd = soc_camera_to_subdev(icd);
818 return v4l2_subdev_call(sd, core, g_chip_ident, id);
821 #ifdef CONFIG_VIDEO_ADV_DEBUG
822 static int soc_camera_g_register(struct file *file, void *fh,
823 struct v4l2_dbg_register *reg)
825 struct soc_camera_file *icf = file->private_data;
826 struct soc_camera_device *icd = icf->icd;
827 struct v4l2_subdev *sd = soc_camera_to_subdev(icd);
829 return v4l2_subdev_call(sd, core, g_register, reg);
832 static int soc_camera_s_register(struct file *file, void *fh,
833 struct v4l2_dbg_register *reg)
835 struct soc_camera_file *icf = file->private_data;
836 struct soc_camera_device *icd = icf->icd;
837 struct v4l2_subdev *sd = soc_camera_to_subdev(icd);
839 return v4l2_subdev_call(sd, core, s_register, reg);
843 /* So far this function cannot fail */
844 static void scan_add_host(struct soc_camera_host *ici)
846 struct soc_camera_device *icd;
848 mutex_lock(&list_lock);
850 list_for_each_entry(icd, &devices, list) {
851 if (icd->iface == ici->nr) {
853 icd->dev.parent = ici->v4l2_dev.dev;
854 dev_set_name(&icd->dev, "%u-%u", icd->iface,
856 ret = device_register(&icd->dev);
858 icd->dev.parent = NULL;
860 "Cannot register device: %d\n", ret);
865 mutex_unlock(&list_lock);
868 #ifdef CONFIG_I2C_BOARDINFO
869 static int soc_camera_init_i2c(struct soc_camera_device *icd,
870 struct soc_camera_link *icl)
872 struct i2c_client *client;
873 struct soc_camera_host *ici = to_soc_camera_host(icd->dev.parent);
874 struct i2c_adapter *adap = i2c_get_adapter(icl->i2c_adapter_id);
875 struct v4l2_subdev *subdev;
878 dev_err(&icd->dev, "Cannot get I2C adapter #%d. No driver?\n",
879 icl->i2c_adapter_id);
883 icl->board_info->platform_data = icd;
885 subdev = v4l2_i2c_new_subdev_board(&ici->v4l2_dev, adap,
886 icl->module_name, icl->board_info, NULL);
890 client = subdev->priv;
892 /* Use to_i2c_client(dev) to recover the i2c client */
893 dev_set_drvdata(&icd->dev, &client->dev);
897 i2c_put_adapter(adap);
902 static void soc_camera_free_i2c(struct soc_camera_device *icd)
904 struct i2c_client *client =
905 to_i2c_client(to_soc_camera_control(icd));
906 dev_set_drvdata(&icd->dev, NULL);
907 v4l2_device_unregister_subdev(i2c_get_clientdata(client));
908 i2c_unregister_device(client);
909 i2c_put_adapter(client->adapter);
912 #define soc_camera_init_i2c(icd, icl) (-ENODEV)
913 #define soc_camera_free_i2c(icd) do {} while (0)
916 static int soc_camera_video_start(struct soc_camera_device *icd);
917 static int video_dev_create(struct soc_camera_device *icd);
918 /* Called during host-driver probe */
919 static int soc_camera_probe(struct device *dev)
921 struct soc_camera_device *icd = to_soc_camera_dev(dev);
922 struct soc_camera_host *ici = to_soc_camera_host(dev->parent);
923 struct soc_camera_link *icl = to_soc_camera_link(icd);
924 struct device *control = NULL;
925 struct v4l2_subdev *sd;
926 struct v4l2_mbus_framefmt mf;
929 dev_info(dev, "Probing %s\n", dev_name(dev));
932 ret = icl->power(icd->pdev, 1);
935 "Platform failed to power-on the camera.\n");
940 /* The camera could have been already on, try to reset */
942 icl->reset(icd->pdev);
944 ret = ici->ops->add(icd);
948 /* Must have icd->vdev before registering the device */
949 ret = video_dev_create(icd);
953 /* Non-i2c cameras, e.g., soc_camera_platform, have no board_info */
954 if (icl->board_info) {
955 ret = soc_camera_init_i2c(icd, icl);
958 } else if (!icl->add_device || !icl->del_device) {
962 if (icl->module_name)
963 ret = request_module(icl->module_name);
965 ret = icl->add_device(icl, &icd->dev);
970 * FIXME: this is racy, have to use driver-binding notification,
971 * when it is available
973 control = to_soc_camera_control(icd);
974 if (!control || !control->driver || !dev_get_drvdata(control) ||
975 !try_module_get(control->driver->owner)) {
976 icl->del_device(icl);
981 /* At this point client .probe() should have run already */
982 ret = soc_camera_init_user_formats(icd);
986 icd->field = V4L2_FIELD_ANY;
988 /* ..._video_start() will create a device node, so we have to protect */
989 mutex_lock(&icd->video_lock);
991 ret = soc_camera_video_start(icd);
995 /* Try to improve our guess of a reasonable window format */
996 sd = soc_camera_to_subdev(icd);
997 if (!v4l2_subdev_call(sd, video, g_mbus_fmt, &mf)) {
998 icd->user_width = mf.width;
999 icd->user_height = mf.height;
1000 icd->colorspace = mf.colorspace;
1001 icd->field = mf.field;
1004 /* Do we have to sysfs_remove_link() before device_unregister()? */
1005 if (sysfs_create_link(&icd->dev.kobj, &to_soc_camera_control(icd)->kobj,
1007 dev_warn(&icd->dev, "Failed creating the control symlink\n");
1009 ici->ops->remove(icd);
1012 icl->power(icd->pdev, 0);
1014 mutex_unlock(&icd->video_lock);
1019 mutex_unlock(&icd->video_lock);
1020 soc_camera_free_user_formats(icd);
1022 if (icl->board_info) {
1023 soc_camera_free_i2c(icd);
1025 icl->del_device(icl);
1026 module_put(control->driver->owner);
1030 video_device_release(icd->vdev);
1032 ici->ops->remove(icd);
1035 icl->power(icd->pdev, 0);
1041 * This is called on device_unregister, which only means we have to disconnect
1042 * from the host, but not remove ourselves from the device list
1044 static int soc_camera_remove(struct device *dev)
1046 struct soc_camera_device *icd = to_soc_camera_dev(dev);
1047 struct soc_camera_link *icl = to_soc_camera_link(icd);
1048 struct video_device *vdev = icd->vdev;
1050 BUG_ON(!dev->parent);
1053 mutex_lock(&icd->video_lock);
1054 video_unregister_device(vdev);
1056 mutex_unlock(&icd->video_lock);
1059 if (icl->board_info) {
1060 soc_camera_free_i2c(icd);
1062 struct device_driver *drv = to_soc_camera_control(icd) ?
1063 to_soc_camera_control(icd)->driver : NULL;
1065 icl->del_device(icl);
1066 module_put(drv->owner);
1069 soc_camera_free_user_formats(icd);
1074 static int soc_camera_suspend(struct device *dev, pm_message_t state)
1076 struct soc_camera_device *icd = to_soc_camera_dev(dev);
1077 struct soc_camera_host *ici = to_soc_camera_host(icd->dev.parent);
1080 if (ici->ops->suspend)
1081 ret = ici->ops->suspend(icd, state);
1086 static int soc_camera_resume(struct device *dev)
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->resume)
1093 ret = ici->ops->resume(icd);
1098 static struct bus_type soc_camera_bus_type = {
1099 .name = "soc-camera",
1100 .probe = soc_camera_probe,
1101 .remove = soc_camera_remove,
1102 .suspend = soc_camera_suspend,
1103 .resume = soc_camera_resume,
1106 static struct device_driver ic_drv = {
1108 .bus = &soc_camera_bus_type,
1109 .owner = THIS_MODULE,
1112 static void dummy_release(struct device *dev)
1116 static int default_cropcap(struct soc_camera_device *icd,
1117 struct v4l2_cropcap *a)
1119 struct v4l2_subdev *sd = soc_camera_to_subdev(icd);
1120 return v4l2_subdev_call(sd, video, cropcap, a);
1123 static int default_g_crop(struct soc_camera_device *icd, struct v4l2_crop *a)
1125 struct v4l2_subdev *sd = soc_camera_to_subdev(icd);
1126 return v4l2_subdev_call(sd, video, g_crop, a);
1129 static int default_s_crop(struct soc_camera_device *icd, struct v4l2_crop *a)
1131 struct v4l2_subdev *sd = soc_camera_to_subdev(icd);
1132 return v4l2_subdev_call(sd, video, s_crop, a);
1135 static void soc_camera_device_init(struct device *dev, void *pdata)
1137 dev->platform_data = pdata;
1138 dev->bus = &soc_camera_bus_type;
1139 dev->release = dummy_release;
1142 int soc_camera_host_register(struct soc_camera_host *ici)
1144 struct soc_camera_host *ix;
1147 if (!ici || !ici->ops ||
1148 !ici->ops->try_fmt ||
1149 !ici->ops->set_fmt ||
1150 !ici->ops->set_bus_param ||
1151 !ici->ops->querycap ||
1152 !ici->ops->init_videobuf ||
1153 !ici->ops->reqbufs ||
1155 !ici->ops->remove ||
1160 if (!ici->ops->set_crop)
1161 ici->ops->set_crop = default_s_crop;
1162 if (!ici->ops->get_crop)
1163 ici->ops->get_crop = default_g_crop;
1164 if (!ici->ops->cropcap)
1165 ici->ops->cropcap = default_cropcap;
1167 mutex_lock(&list_lock);
1168 list_for_each_entry(ix, &hosts, list) {
1169 if (ix->nr == ici->nr) {
1175 ret = v4l2_device_register(ici->v4l2_dev.dev, &ici->v4l2_dev);
1179 list_add_tail(&ici->list, &hosts);
1180 mutex_unlock(&list_lock);
1187 mutex_unlock(&list_lock);
1190 EXPORT_SYMBOL(soc_camera_host_register);
1192 /* Unregister all clients! */
1193 void soc_camera_host_unregister(struct soc_camera_host *ici)
1195 struct soc_camera_device *icd;
1197 mutex_lock(&list_lock);
1199 list_del(&ici->list);
1201 list_for_each_entry(icd, &devices, list) {
1202 if (icd->iface == ici->nr) {
1203 void *pdata = icd->dev.platform_data;
1204 /* The bus->remove will be called */
1205 device_unregister(&icd->dev);
1207 * Not before device_unregister(), .remove
1208 * needs parent to call ici->ops->remove().
1209 * If the host module is loaded again, device_register()
1210 * would complain "already initialised," since 2.6.32
1211 * this is also needed to prevent use-after-free of the
1212 * device private data.
1214 memset(&icd->dev, 0, sizeof(icd->dev));
1215 soc_camera_device_init(&icd->dev, pdata);
1219 mutex_unlock(&list_lock);
1221 v4l2_device_unregister(&ici->v4l2_dev);
1223 EXPORT_SYMBOL(soc_camera_host_unregister);
1225 /* Image capture device */
1226 static int soc_camera_device_register(struct soc_camera_device *icd)
1228 struct soc_camera_device *ix;
1231 for (i = 0; i < 256 && num < 0; i++) {
1233 /* Check if this index is available on this interface */
1234 list_for_each_entry(ix, &devices, list) {
1235 if (ix->iface == icd->iface && ix->devnum == i) {
1244 * ok, we have 256 cameras on this host...
1245 * man, stay reasonable...
1251 icd->host_priv = NULL;
1252 mutex_init(&icd->video_lock);
1254 list_add_tail(&icd->list, &devices);
1259 static void soc_camera_device_unregister(struct soc_camera_device *icd)
1261 list_del(&icd->list);
1264 static const struct v4l2_ioctl_ops soc_camera_ioctl_ops = {
1265 .vidioc_querycap = soc_camera_querycap,
1266 .vidioc_g_fmt_vid_cap = soc_camera_g_fmt_vid_cap,
1267 .vidioc_enum_fmt_vid_cap = soc_camera_enum_fmt_vid_cap,
1268 .vidioc_s_fmt_vid_cap = soc_camera_s_fmt_vid_cap,
1269 .vidioc_enum_input = soc_camera_enum_input,
1270 .vidioc_g_input = soc_camera_g_input,
1271 .vidioc_s_input = soc_camera_s_input,
1272 .vidioc_s_std = soc_camera_s_std,
1273 .vidioc_reqbufs = soc_camera_reqbufs,
1274 .vidioc_try_fmt_vid_cap = soc_camera_try_fmt_vid_cap,
1275 .vidioc_querybuf = soc_camera_querybuf,
1276 .vidioc_qbuf = soc_camera_qbuf,
1277 .vidioc_dqbuf = soc_camera_dqbuf,
1278 .vidioc_streamon = soc_camera_streamon,
1279 .vidioc_streamoff = soc_camera_streamoff,
1280 .vidioc_queryctrl = soc_camera_queryctrl,
1281 .vidioc_g_ctrl = soc_camera_g_ctrl,
1282 .vidioc_s_ctrl = soc_camera_s_ctrl,
1283 .vidioc_cropcap = soc_camera_cropcap,
1284 .vidioc_g_crop = soc_camera_g_crop,
1285 .vidioc_s_crop = soc_camera_s_crop,
1286 .vidioc_g_parm = soc_camera_g_parm,
1287 .vidioc_s_parm = soc_camera_s_parm,
1288 .vidioc_g_chip_ident = soc_camera_g_chip_ident,
1289 #ifdef CONFIG_VIDEO_ADV_DEBUG
1290 .vidioc_g_register = soc_camera_g_register,
1291 .vidioc_s_register = soc_camera_s_register,
1295 static int video_dev_create(struct soc_camera_device *icd)
1297 struct soc_camera_host *ici = to_soc_camera_host(icd->dev.parent);
1298 struct video_device *vdev = video_device_alloc();
1303 strlcpy(vdev->name, ici->drv_name, sizeof(vdev->name));
1305 vdev->parent = &icd->dev;
1306 vdev->current_norm = V4L2_STD_UNKNOWN;
1307 vdev->fops = &soc_camera_fops;
1308 vdev->ioctl_ops = &soc_camera_ioctl_ops;
1309 vdev->release = video_device_release;
1310 vdev->tvnorms = V4L2_STD_UNKNOWN;
1318 * Called from soc_camera_probe() above (with .video_lock held???)
1320 static int soc_camera_video_start(struct soc_camera_device *icd)
1324 if (!icd->dev.parent)
1328 !icd->ops->query_bus_param ||
1329 !icd->ops->set_bus_param)
1332 ret = video_register_device(icd->vdev, VFL_TYPE_GRABBER, -1);
1334 dev_err(&icd->dev, "video_register_device failed: %d\n", ret);
1341 static int __devinit soc_camera_pdrv_probe(struct platform_device *pdev)
1343 struct soc_camera_link *icl = pdev->dev.platform_data;
1344 struct soc_camera_device *icd;
1350 icd = kzalloc(sizeof(*icd), GFP_KERNEL);
1354 icd->iface = icl->bus_id;
1355 icd->pdev = &pdev->dev;
1356 platform_set_drvdata(pdev, icd);
1358 ret = soc_camera_device_register(icd);
1362 soc_camera_device_init(&icd->dev, icl);
1364 icd->user_width = DEFAULT_WIDTH;
1365 icd->user_height = DEFAULT_HEIGHT;
1376 * Only called on rmmod for each platform device, since they are not
1377 * hot-pluggable. Now we know, that all our users - hosts and devices have
1378 * been unloaded already
1380 static int __devexit soc_camera_pdrv_remove(struct platform_device *pdev)
1382 struct soc_camera_device *icd = platform_get_drvdata(pdev);
1387 soc_camera_device_unregister(icd);
1394 static struct platform_driver __refdata soc_camera_pdrv = {
1395 .remove = __devexit_p(soc_camera_pdrv_remove),
1397 .name = "soc-camera-pdrv",
1398 .owner = THIS_MODULE,
1402 static int __init soc_camera_init(void)
1404 int ret = bus_register(&soc_camera_bus_type);
1407 ret = driver_register(&ic_drv);
1411 ret = platform_driver_probe(&soc_camera_pdrv, soc_camera_pdrv_probe);
1418 driver_unregister(&ic_drv);
1420 bus_unregister(&soc_camera_bus_type);
1424 static void __exit soc_camera_exit(void)
1426 platform_driver_unregister(&soc_camera_pdrv);
1427 driver_unregister(&ic_drv);
1428 bus_unregister(&soc_camera_bus_type);
1431 module_init(soc_camera_init);
1432 module_exit(soc_camera_exit);
1434 MODULE_DESCRIPTION("Image capture bus driver");
1435 MODULE_AUTHOR("Guennadi Liakhovetski <kernel@pengutronix.de>");
1436 MODULE_LICENSE("GPL");
1437 MODULE_ALIAS("platform:soc-camera-pdrv");