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/vmalloc.h>
29 #include <media/soc_camera.h>
30 #include <media/v4l2-common.h>
31 #include <media/v4l2-ioctl.h>
32 #include <media/v4l2-dev.h>
33 #include <media/videobuf-core.h>
34 #include <media/soc_mediabus.h>
36 /* Default to VGA resolution */
37 #define DEFAULT_WIDTH 640
38 #define DEFAULT_HEIGHT 480
40 static LIST_HEAD(hosts);
41 static LIST_HEAD(devices);
42 static DEFINE_MUTEX(list_lock); /* Protects the list of hosts */
44 const struct soc_camera_format_xlate *soc_camera_xlate_by_fourcc(
45 struct soc_camera_device *icd, unsigned int fourcc)
49 for (i = 0; i < icd->num_user_formats; i++)
50 if (icd->user_formats[i].host_fmt->fourcc == fourcc)
51 return icd->user_formats + i;
54 EXPORT_SYMBOL(soc_camera_xlate_by_fourcc);
57 * soc_camera_apply_sensor_flags() - apply platform SOCAM_SENSOR_INVERT_* flags
58 * @icl: camera platform parameters
59 * @flags: flags to be inverted according to platform configuration
60 * @return: resulting flags
62 unsigned long soc_camera_apply_sensor_flags(struct soc_camera_link *icl,
67 /* If only one of the two polarities is supported, switch to the opposite */
68 if (icl->flags & SOCAM_SENSOR_INVERT_HSYNC) {
69 f = flags & (SOCAM_HSYNC_ACTIVE_HIGH | SOCAM_HSYNC_ACTIVE_LOW);
70 if (f == SOCAM_HSYNC_ACTIVE_HIGH || f == SOCAM_HSYNC_ACTIVE_LOW)
71 flags ^= SOCAM_HSYNC_ACTIVE_HIGH | SOCAM_HSYNC_ACTIVE_LOW;
74 if (icl->flags & SOCAM_SENSOR_INVERT_VSYNC) {
75 f = flags & (SOCAM_VSYNC_ACTIVE_HIGH | SOCAM_VSYNC_ACTIVE_LOW);
76 if (f == SOCAM_VSYNC_ACTIVE_HIGH || f == SOCAM_VSYNC_ACTIVE_LOW)
77 flags ^= SOCAM_VSYNC_ACTIVE_HIGH | SOCAM_VSYNC_ACTIVE_LOW;
80 if (icl->flags & SOCAM_SENSOR_INVERT_PCLK) {
81 f = flags & (SOCAM_PCLK_SAMPLE_RISING | SOCAM_PCLK_SAMPLE_FALLING);
82 if (f == SOCAM_PCLK_SAMPLE_RISING || f == SOCAM_PCLK_SAMPLE_FALLING)
83 flags ^= SOCAM_PCLK_SAMPLE_RISING | SOCAM_PCLK_SAMPLE_FALLING;
88 EXPORT_SYMBOL(soc_camera_apply_sensor_flags);
90 static int soc_camera_try_fmt_vid_cap(struct file *file, void *priv,
91 struct v4l2_format *f)
93 struct soc_camera_file *icf = file->private_data;
94 struct soc_camera_device *icd = icf->icd;
95 struct soc_camera_host *ici = to_soc_camera_host(icd->dev.parent);
97 WARN_ON(priv != file->private_data);
99 /* limit format to hardware capabilities */
100 return ici->ops->try_fmt(icd, f);
103 static int soc_camera_enum_input(struct file *file, void *priv,
104 struct v4l2_input *inp)
106 struct soc_camera_file *icf = file->private_data;
107 struct soc_camera_device *icd = icf->icd;
113 if (icd->ops->enum_input)
114 ret = icd->ops->enum_input(icd, inp);
116 /* default is camera */
117 inp->type = V4L2_INPUT_TYPE_CAMERA;
118 inp->std = V4L2_STD_UNKNOWN;
119 strcpy(inp->name, "Camera");
125 static int soc_camera_g_input(struct file *file, void *priv, unsigned int *i)
132 static int soc_camera_s_input(struct file *file, void *priv, unsigned int i)
140 static int soc_camera_s_std(struct file *file, void *priv, v4l2_std_id *a)
142 struct soc_camera_file *icf = file->private_data;
143 struct soc_camera_device *icd = icf->icd;
144 struct v4l2_subdev *sd = soc_camera_to_subdev(icd);
146 return v4l2_subdev_call(sd, core, s_std, *a);
149 static int soc_camera_reqbufs(struct file *file, void *priv,
150 struct v4l2_requestbuffers *p)
153 struct soc_camera_file *icf = file->private_data;
154 struct soc_camera_device *icd = icf->icd;
155 struct soc_camera_host *ici = to_soc_camera_host(icd->dev.parent);
157 WARN_ON(priv != file->private_data);
159 ret = videobuf_reqbufs(&icf->vb_vidq, p);
163 return ici->ops->reqbufs(icf, p);
166 static int soc_camera_querybuf(struct file *file, void *priv,
167 struct v4l2_buffer *p)
169 struct soc_camera_file *icf = file->private_data;
171 WARN_ON(priv != file->private_data);
173 return videobuf_querybuf(&icf->vb_vidq, p);
176 static int soc_camera_qbuf(struct file *file, void *priv,
177 struct v4l2_buffer *p)
179 struct soc_camera_file *icf = file->private_data;
181 WARN_ON(priv != file->private_data);
183 return videobuf_qbuf(&icf->vb_vidq, p);
186 static int soc_camera_dqbuf(struct file *file, void *priv,
187 struct v4l2_buffer *p)
189 struct soc_camera_file *icf = file->private_data;
191 WARN_ON(priv != file->private_data);
193 return videobuf_dqbuf(&icf->vb_vidq, p, file->f_flags & O_NONBLOCK);
196 /* Always entered with .video_lock held */
197 static int soc_camera_init_user_formats(struct soc_camera_device *icd)
199 struct v4l2_subdev *sd = soc_camera_to_subdev(icd);
200 struct soc_camera_host *ici = to_soc_camera_host(icd->dev.parent);
201 int i, fmts = 0, raw_fmts = 0, ret;
202 enum v4l2_mbus_pixelcode code;
204 while (!v4l2_subdev_call(sd, video, enum_mbus_fmt, raw_fmts, &code))
207 if (!ici->ops->get_formats)
209 * Fallback mode - the host will have to serve all
210 * sensor-provided formats one-to-one to the user
215 * First pass - only count formats this host-sensor
216 * configuration can provide
218 for (i = 0; i < raw_fmts; i++) {
219 ret = ici->ops->get_formats(icd, i, NULL);
229 vmalloc(fmts * sizeof(struct soc_camera_format_xlate));
230 if (!icd->user_formats)
233 icd->num_user_formats = fmts;
235 dev_dbg(&icd->dev, "Found %d supported formats.\n", fmts);
237 /* Second pass - actually fill data formats */
239 for (i = 0; i < raw_fmts; i++)
240 if (!ici->ops->get_formats) {
241 v4l2_subdev_call(sd, video, enum_mbus_fmt, i, &code);
242 icd->user_formats[i].host_fmt =
243 soc_mbus_get_fmtdesc(code);
244 icd->user_formats[i].code = code;
246 ret = ici->ops->get_formats(icd, i,
247 &icd->user_formats[fmts]);
253 icd->current_fmt = &icd->user_formats[0];
258 icd->num_user_formats = 0;
259 vfree(icd->user_formats);
263 /* Always entered with .video_lock held */
264 static void soc_camera_free_user_formats(struct soc_camera_device *icd)
266 struct soc_camera_host *ici = to_soc_camera_host(icd->dev.parent);
268 if (ici->ops->put_formats)
269 ici->ops->put_formats(icd);
270 icd->current_fmt = NULL;
271 icd->num_user_formats = 0;
272 vfree(icd->user_formats);
273 icd->user_formats = NULL;
276 #define pixfmtstr(x) (x) & 0xff, ((x) >> 8) & 0xff, ((x) >> 16) & 0xff, \
279 /* Called with .vb_lock held, or from the first open(2), see comment there */
280 static int soc_camera_set_fmt(struct soc_camera_file *icf,
281 struct v4l2_format *f)
283 struct soc_camera_device *icd = icf->icd;
284 struct soc_camera_host *ici = to_soc_camera_host(icd->dev.parent);
285 struct v4l2_pix_format *pix = &f->fmt.pix;
288 dev_dbg(&icd->dev, "S_FMT(%c%c%c%c, %ux%u)\n",
289 pixfmtstr(pix->pixelformat), pix->width, pix->height);
291 /* We always call try_fmt() before set_fmt() or set_crop() */
292 ret = ici->ops->try_fmt(icd, f);
296 ret = ici->ops->set_fmt(icd, f);
299 } else if (!icd->current_fmt ||
300 icd->current_fmt->host_fmt->fourcc != pix->pixelformat) {
302 "Host driver hasn't set up current format correctly!\n");
306 icd->user_width = pix->width;
307 icd->user_height = pix->height;
308 icd->colorspace = pix->colorspace;
310 icd->field = pix->field;
312 if (f->type != V4L2_BUF_TYPE_VIDEO_CAPTURE)
313 dev_warn(&icd->dev, "Attention! Wrong buf-type %d\n",
316 dev_dbg(&icd->dev, "set width: %d height: %d\n",
317 icd->user_width, icd->user_height);
319 /* set physical bus parameters */
320 return ici->ops->set_bus_param(icd, pix->pixelformat);
323 static int soc_camera_open(struct file *file)
325 struct video_device *vdev = video_devdata(file);
326 struct soc_camera_device *icd = container_of(vdev->parent,
327 struct soc_camera_device,
329 struct soc_camera_link *icl = to_soc_camera_link(icd);
330 struct soc_camera_host *ici;
331 struct soc_camera_file *icf;
335 /* No device driver attached */
338 ici = to_soc_camera_host(icd->dev.parent);
340 icf = vmalloc(sizeof(*icf));
344 if (!try_module_get(ici->ops->owner)) {
345 dev_err(&icd->dev, "Couldn't lock capture bus driver.\n");
351 * Protect against icd->ops->remove() until we module_get() both
354 mutex_lock(&icd->video_lock);
359 /* Now we really have to activate the camera */
360 if (icd->use_count == 1) {
361 /* Restore parameters before the last close() per V4L2 API */
362 struct v4l2_format f = {
363 .type = V4L2_BUF_TYPE_VIDEO_CAPTURE,
365 .width = icd->user_width,
366 .height = icd->user_height,
368 .colorspace = icd->colorspace,
370 icd->current_fmt->host_fmt->fourcc,
375 ret = icl->power(icd->pdev, 1);
380 /* The camera could have been already on, try to reset */
382 icl->reset(icd->pdev);
384 ret = ici->ops->add(icd);
386 dev_err(&icd->dev, "Couldn't activate the camera: %d\n", ret);
391 * Try to configure with default parameters. Notice: this is the
392 * very first open, so, we cannot race against other calls,
393 * apart from someone else calling open() simultaneously, but
394 * .video_lock is protecting us against it.
396 ret = soc_camera_set_fmt(icf, &f);
401 file->private_data = icf;
402 dev_dbg(&icd->dev, "camera device open\n");
404 ici->ops->init_videobuf(&icf->vb_vidq, icd);
406 mutex_unlock(&icd->video_lock);
411 * First five errors are entered with the .video_lock held
415 ici->ops->remove(icd);
418 icl->power(icd->pdev, 0);
421 mutex_unlock(&icd->video_lock);
422 module_put(ici->ops->owner);
428 static int soc_camera_close(struct file *file)
430 struct soc_camera_file *icf = file->private_data;
431 struct soc_camera_device *icd = icf->icd;
432 struct soc_camera_host *ici = to_soc_camera_host(icd->dev.parent);
434 mutex_lock(&icd->video_lock);
436 if (!icd->use_count) {
437 struct soc_camera_link *icl = to_soc_camera_link(icd);
439 ici->ops->remove(icd);
441 icl->power(icd->pdev, 0);
444 mutex_unlock(&icd->video_lock);
446 module_put(ici->ops->owner);
450 dev_dbg(&icd->dev, "camera device close\n");
455 static ssize_t soc_camera_read(struct file *file, char __user *buf,
456 size_t count, loff_t *ppos)
458 struct soc_camera_file *icf = file->private_data;
459 struct soc_camera_device *icd = icf->icd;
462 dev_err(&icd->dev, "camera device read not implemented\n");
467 static int soc_camera_mmap(struct file *file, struct vm_area_struct *vma)
469 struct soc_camera_file *icf = file->private_data;
470 struct soc_camera_device *icd = icf->icd;
473 dev_dbg(&icd->dev, "mmap called, vma=0x%08lx\n", (unsigned long)vma);
475 err = videobuf_mmap_mapper(&icf->vb_vidq, vma);
477 dev_dbg(&icd->dev, "vma start=0x%08lx, size=%ld, ret=%d\n",
478 (unsigned long)vma->vm_start,
479 (unsigned long)vma->vm_end - (unsigned long)vma->vm_start,
485 static unsigned int soc_camera_poll(struct file *file, poll_table *pt)
487 struct soc_camera_file *icf = file->private_data;
488 struct soc_camera_device *icd = icf->icd;
489 struct soc_camera_host *ici = to_soc_camera_host(icd->dev.parent);
491 if (list_empty(&icf->vb_vidq.stream)) {
492 dev_err(&icd->dev, "Trying to poll with no queued buffers!\n");
496 return ici->ops->poll(file, pt);
499 static struct v4l2_file_operations soc_camera_fops = {
500 .owner = THIS_MODULE,
501 .open = soc_camera_open,
502 .release = soc_camera_close,
503 .ioctl = video_ioctl2,
504 .read = soc_camera_read,
505 .mmap = soc_camera_mmap,
506 .poll = soc_camera_poll,
509 static int soc_camera_s_fmt_vid_cap(struct file *file, void *priv,
510 struct v4l2_format *f)
512 struct soc_camera_file *icf = file->private_data;
513 struct soc_camera_device *icd = icf->icd;
516 WARN_ON(priv != file->private_data);
518 mutex_lock(&icf->vb_vidq.vb_lock);
520 if (icf->vb_vidq.bufs[0]) {
521 dev_err(&icd->dev, "S_FMT denied: queue initialised\n");
526 ret = soc_camera_set_fmt(icf, f);
529 mutex_unlock(&icf->vb_vidq.vb_lock);
534 static int soc_camera_enum_fmt_vid_cap(struct file *file, void *priv,
535 struct v4l2_fmtdesc *f)
537 struct soc_camera_file *icf = file->private_data;
538 struct soc_camera_device *icd = icf->icd;
539 const struct soc_mbus_pixelfmt *format;
541 WARN_ON(priv != file->private_data);
543 if (f->index >= icd->num_user_formats)
546 format = icd->user_formats[f->index].host_fmt;
549 strlcpy(f->description, format->name, sizeof(f->description));
550 f->pixelformat = format->fourcc;
554 static int soc_camera_g_fmt_vid_cap(struct file *file, void *priv,
555 struct v4l2_format *f)
557 struct soc_camera_file *icf = file->private_data;
558 struct soc_camera_device *icd = icf->icd;
559 struct v4l2_pix_format *pix = &f->fmt.pix;
561 WARN_ON(priv != file->private_data);
563 pix->width = icd->user_width;
564 pix->height = icd->user_height;
565 pix->field = icf->vb_vidq.field;
566 pix->pixelformat = icd->current_fmt->host_fmt->fourcc;
567 pix->bytesperline = soc_mbus_bytes_per_line(pix->width,
568 icd->current_fmt->host_fmt);
569 pix->colorspace = icd->colorspace;
570 if (pix->bytesperline < 0)
571 return pix->bytesperline;
572 pix->sizeimage = pix->height * pix->bytesperline;
573 dev_dbg(&icd->dev, "current_fmt->fourcc: 0x%08x\n",
574 icd->current_fmt->host_fmt->fourcc);
578 static int soc_camera_querycap(struct file *file, void *priv,
579 struct v4l2_capability *cap)
581 struct soc_camera_file *icf = file->private_data;
582 struct soc_camera_device *icd = icf->icd;
583 struct soc_camera_host *ici = to_soc_camera_host(icd->dev.parent);
585 WARN_ON(priv != file->private_data);
587 strlcpy(cap->driver, ici->drv_name, sizeof(cap->driver));
588 return ici->ops->querycap(ici, cap);
591 static int soc_camera_streamon(struct file *file, void *priv,
592 enum v4l2_buf_type i)
594 struct soc_camera_file *icf = file->private_data;
595 struct soc_camera_device *icd = icf->icd;
596 struct v4l2_subdev *sd = soc_camera_to_subdev(icd);
599 WARN_ON(priv != file->private_data);
601 if (i != V4L2_BUF_TYPE_VIDEO_CAPTURE)
604 mutex_lock(&icd->video_lock);
606 v4l2_subdev_call(sd, video, s_stream, 1);
608 /* This calls buf_queue from host driver's videobuf_queue_ops */
609 ret = videobuf_streamon(&icf->vb_vidq);
611 mutex_unlock(&icd->video_lock);
616 static int soc_camera_streamoff(struct file *file, void *priv,
617 enum v4l2_buf_type i)
619 struct soc_camera_file *icf = file->private_data;
620 struct soc_camera_device *icd = icf->icd;
621 struct v4l2_subdev *sd = soc_camera_to_subdev(icd);
623 WARN_ON(priv != file->private_data);
625 if (i != V4L2_BUF_TYPE_VIDEO_CAPTURE)
628 mutex_lock(&icd->video_lock);
631 * This calls buf_release from host driver's videobuf_queue_ops for all
632 * remaining buffers. When the last buffer is freed, stop capture
634 videobuf_streamoff(&icf->vb_vidq);
636 v4l2_subdev_call(sd, video, s_stream, 0);
638 mutex_unlock(&icd->video_lock);
643 static int soc_camera_queryctrl(struct file *file, void *priv,
644 struct v4l2_queryctrl *qc)
646 struct soc_camera_file *icf = file->private_data;
647 struct soc_camera_device *icd = icf->icd;
648 struct soc_camera_host *ici = to_soc_camera_host(icd->dev.parent);
651 WARN_ON(priv != file->private_data);
656 /* First check host controls */
657 for (i = 0; i < ici->ops->num_controls; i++)
658 if (qc->id == ici->ops->controls[i].id) {
659 memcpy(qc, &(ici->ops->controls[i]),
664 /* Then device controls */
665 for (i = 0; i < icd->ops->num_controls; i++)
666 if (qc->id == icd->ops->controls[i].id) {
667 memcpy(qc, &(icd->ops->controls[i]),
675 static int soc_camera_g_ctrl(struct file *file, void *priv,
676 struct v4l2_control *ctrl)
678 struct soc_camera_file *icf = file->private_data;
679 struct soc_camera_device *icd = icf->icd;
680 struct soc_camera_host *ici = to_soc_camera_host(icd->dev.parent);
681 struct v4l2_subdev *sd = soc_camera_to_subdev(icd);
684 WARN_ON(priv != file->private_data);
686 if (ici->ops->get_ctrl) {
687 ret = ici->ops->get_ctrl(icd, ctrl);
688 if (ret != -ENOIOCTLCMD)
692 return v4l2_subdev_call(sd, core, g_ctrl, ctrl);
695 static int soc_camera_s_ctrl(struct file *file, void *priv,
696 struct v4l2_control *ctrl)
698 struct soc_camera_file *icf = file->private_data;
699 struct soc_camera_device *icd = icf->icd;
700 struct soc_camera_host *ici = to_soc_camera_host(icd->dev.parent);
701 struct v4l2_subdev *sd = soc_camera_to_subdev(icd);
704 WARN_ON(priv != file->private_data);
706 if (ici->ops->set_ctrl) {
707 ret = ici->ops->set_ctrl(icd, ctrl);
708 if (ret != -ENOIOCTLCMD)
712 return v4l2_subdev_call(sd, core, s_ctrl, ctrl);
715 static int soc_camera_cropcap(struct file *file, void *fh,
716 struct v4l2_cropcap *a)
718 struct soc_camera_file *icf = file->private_data;
719 struct soc_camera_device *icd = icf->icd;
720 struct soc_camera_host *ici = to_soc_camera_host(icd->dev.parent);
722 return ici->ops->cropcap(icd, a);
725 static int soc_camera_g_crop(struct file *file, void *fh,
728 struct soc_camera_file *icf = file->private_data;
729 struct soc_camera_device *icd = icf->icd;
730 struct soc_camera_host *ici = to_soc_camera_host(icd->dev.parent);
733 mutex_lock(&icf->vb_vidq.vb_lock);
734 ret = ici->ops->get_crop(icd, a);
735 mutex_unlock(&icf->vb_vidq.vb_lock);
741 * According to the V4L2 API, drivers shall not update the struct v4l2_crop
742 * argument with the actual geometry, instead, the user shall use G_CROP to
743 * retrieve it. However, we expect camera host and client drivers to update
744 * the argument, which we then use internally, but do not return to the user.
746 static int soc_camera_s_crop(struct file *file, void *fh,
749 struct soc_camera_file *icf = file->private_data;
750 struct soc_camera_device *icd = icf->icd;
751 struct soc_camera_host *ici = to_soc_camera_host(icd->dev.parent);
752 struct v4l2_rect *rect = &a->c;
753 struct v4l2_crop current_crop;
756 if (a->type != V4L2_BUF_TYPE_VIDEO_CAPTURE)
759 dev_dbg(&icd->dev, "S_CROP(%ux%u@%u:%u)\n",
760 rect->width, rect->height, rect->left, rect->top);
762 /* Cropping is allowed during a running capture, guard consistency */
763 mutex_lock(&icf->vb_vidq.vb_lock);
765 /* If get_crop fails, we'll let host and / or client drivers decide */
766 ret = ici->ops->get_crop(icd, ¤t_crop);
768 /* Prohibit window size change with initialised buffers */
769 if (icf->vb_vidq.bufs[0] && !ret &&
770 (a->c.width != current_crop.c.width ||
771 a->c.height != current_crop.c.height)) {
773 "S_CROP denied: queue initialised and sizes differ\n");
776 ret = ici->ops->set_crop(icd, a);
779 mutex_unlock(&icf->vb_vidq.vb_lock);
784 static int soc_camera_g_chip_ident(struct file *file, void *fh,
785 struct v4l2_dbg_chip_ident *id)
787 struct soc_camera_file *icf = file->private_data;
788 struct soc_camera_device *icd = icf->icd;
789 struct v4l2_subdev *sd = soc_camera_to_subdev(icd);
791 return v4l2_subdev_call(sd, core, g_chip_ident, id);
794 #ifdef CONFIG_VIDEO_ADV_DEBUG
795 static int soc_camera_g_register(struct file *file, void *fh,
796 struct v4l2_dbg_register *reg)
798 struct soc_camera_file *icf = file->private_data;
799 struct soc_camera_device *icd = icf->icd;
800 struct v4l2_subdev *sd = soc_camera_to_subdev(icd);
802 return v4l2_subdev_call(sd, core, g_register, reg);
805 static int soc_camera_s_register(struct file *file, void *fh,
806 struct v4l2_dbg_register *reg)
808 struct soc_camera_file *icf = file->private_data;
809 struct soc_camera_device *icd = icf->icd;
810 struct v4l2_subdev *sd = soc_camera_to_subdev(icd);
812 return v4l2_subdev_call(sd, core, s_register, reg);
816 /* So far this function cannot fail */
817 static void scan_add_host(struct soc_camera_host *ici)
819 struct soc_camera_device *icd;
821 mutex_lock(&list_lock);
823 list_for_each_entry(icd, &devices, list) {
824 if (icd->iface == ici->nr) {
826 icd->dev.parent = ici->v4l2_dev.dev;
827 dev_set_name(&icd->dev, "%u-%u", icd->iface,
829 ret = device_register(&icd->dev);
831 icd->dev.parent = NULL;
833 "Cannot register device: %d\n", ret);
838 mutex_unlock(&list_lock);
841 #ifdef CONFIG_I2C_BOARDINFO
842 static int soc_camera_init_i2c(struct soc_camera_device *icd,
843 struct soc_camera_link *icl)
845 struct i2c_client *client;
846 struct soc_camera_host *ici = to_soc_camera_host(icd->dev.parent);
847 struct i2c_adapter *adap = i2c_get_adapter(icl->i2c_adapter_id);
848 struct v4l2_subdev *subdev;
853 dev_err(&icd->dev, "Cannot get I2C adapter #%d. No driver?\n",
854 icl->i2c_adapter_id);
858 icl->board_info->platform_data = icd;
860 subdev = v4l2_i2c_new_subdev_board(&ici->v4l2_dev, adap,
861 icl->module_name, icl->board_info, NULL);
867 client = subdev->priv;
869 /* Use to_i2c_client(dev) to recover the i2c client */
870 dev_set_drvdata(&icd->dev, &client->dev);
874 i2c_put_adapter(adap);
879 static void soc_camera_free_i2c(struct soc_camera_device *icd)
881 struct i2c_client *client =
882 to_i2c_client(to_soc_camera_control(icd));
883 dev_set_drvdata(&icd->dev, NULL);
884 v4l2_device_unregister_subdev(i2c_get_clientdata(client));
885 i2c_unregister_device(client);
886 i2c_put_adapter(client->adapter);
889 #define soc_camera_init_i2c(icd, icl) (-ENODEV)
890 #define soc_camera_free_i2c(icd) do {} while (0)
893 static int soc_camera_video_start(struct soc_camera_device *icd);
894 static int video_dev_create(struct soc_camera_device *icd);
895 /* Called during host-driver probe */
896 static int soc_camera_probe(struct device *dev)
898 struct soc_camera_device *icd = to_soc_camera_dev(dev);
899 struct soc_camera_host *ici = to_soc_camera_host(dev->parent);
900 struct soc_camera_link *icl = to_soc_camera_link(icd);
901 struct device *control = NULL;
902 struct v4l2_subdev *sd;
903 struct v4l2_mbus_framefmt mf;
906 dev_info(dev, "Probing %s\n", dev_name(dev));
909 ret = icl->power(icd->pdev, 1);
912 "Platform failed to power-on the camera.\n");
917 /* The camera could have been already on, try to reset */
919 icl->reset(icd->pdev);
921 ret = ici->ops->add(icd);
925 /* Must have icd->vdev before registering the device */
926 ret = video_dev_create(icd);
930 /* Non-i2c cameras, e.g., soc_camera_platform, have no board_info */
931 if (icl->board_info) {
932 ret = soc_camera_init_i2c(icd, icl);
935 } else if (!icl->add_device || !icl->del_device) {
939 if (icl->module_name)
940 ret = request_module(icl->module_name);
942 ret = icl->add_device(icl, &icd->dev);
947 * FIXME: this is racy, have to use driver-binding notification,
948 * when it is available
950 control = to_soc_camera_control(icd);
951 if (!control || !control->driver || !dev_get_drvdata(control) ||
952 !try_module_get(control->driver->owner)) {
953 icl->del_device(icl);
958 /* At this point client .probe() should have run already */
959 ret = soc_camera_init_user_formats(icd);
963 icd->field = V4L2_FIELD_ANY;
965 /* ..._video_start() will create a device node, so we have to protect */
966 mutex_lock(&icd->video_lock);
968 ret = soc_camera_video_start(icd);
972 /* Try to improve our guess of a reasonable window format */
973 sd = soc_camera_to_subdev(icd);
974 if (!v4l2_subdev_call(sd, video, g_mbus_fmt, &mf)) {
975 icd->user_width = mf.width;
976 icd->user_height = mf.height;
977 icd->colorspace = mf.colorspace;
978 icd->field = mf.field;
981 /* Do we have to sysfs_remove_link() before device_unregister()? */
982 if (sysfs_create_link(&icd->dev.kobj, &to_soc_camera_control(icd)->kobj,
984 dev_warn(&icd->dev, "Failed creating the control symlink\n");
986 ici->ops->remove(icd);
989 icl->power(icd->pdev, 0);
991 mutex_unlock(&icd->video_lock);
996 mutex_unlock(&icd->video_lock);
997 soc_camera_free_user_formats(icd);
999 if (icl->board_info) {
1000 soc_camera_free_i2c(icd);
1002 icl->del_device(icl);
1003 module_put(control->driver->owner);
1007 video_device_release(icd->vdev);
1009 ici->ops->remove(icd);
1012 icl->power(icd->pdev, 0);
1018 * This is called on device_unregister, which only means we have to disconnect
1019 * from the host, but not remove ourselves from the device list
1021 static int soc_camera_remove(struct device *dev)
1023 struct soc_camera_device *icd = to_soc_camera_dev(dev);
1024 struct soc_camera_link *icl = to_soc_camera_link(icd);
1025 struct video_device *vdev = icd->vdev;
1027 BUG_ON(!dev->parent);
1030 mutex_lock(&icd->video_lock);
1031 video_unregister_device(vdev);
1033 mutex_unlock(&icd->video_lock);
1036 if (icl->board_info) {
1037 soc_camera_free_i2c(icd);
1039 struct device_driver *drv = to_soc_camera_control(icd) ?
1040 to_soc_camera_control(icd)->driver : NULL;
1042 icl->del_device(icl);
1043 module_put(drv->owner);
1046 soc_camera_free_user_formats(icd);
1051 static int soc_camera_suspend(struct device *dev, pm_message_t state)
1053 struct soc_camera_device *icd = to_soc_camera_dev(dev);
1054 struct soc_camera_host *ici = to_soc_camera_host(icd->dev.parent);
1057 if (ici->ops->suspend)
1058 ret = ici->ops->suspend(icd, state);
1063 static int soc_camera_resume(struct device *dev)
1065 struct soc_camera_device *icd = to_soc_camera_dev(dev);
1066 struct soc_camera_host *ici = to_soc_camera_host(icd->dev.parent);
1069 if (ici->ops->resume)
1070 ret = ici->ops->resume(icd);
1075 static struct bus_type soc_camera_bus_type = {
1076 .name = "soc-camera",
1077 .probe = soc_camera_probe,
1078 .remove = soc_camera_remove,
1079 .suspend = soc_camera_suspend,
1080 .resume = soc_camera_resume,
1083 static struct device_driver ic_drv = {
1085 .bus = &soc_camera_bus_type,
1086 .owner = THIS_MODULE,
1089 static void dummy_release(struct device *dev)
1093 static int default_cropcap(struct soc_camera_device *icd,
1094 struct v4l2_cropcap *a)
1096 struct v4l2_subdev *sd = soc_camera_to_subdev(icd);
1097 return v4l2_subdev_call(sd, video, cropcap, a);
1100 static int default_g_crop(struct soc_camera_device *icd, struct v4l2_crop *a)
1102 struct v4l2_subdev *sd = soc_camera_to_subdev(icd);
1103 return v4l2_subdev_call(sd, video, g_crop, a);
1106 static int default_s_crop(struct soc_camera_device *icd, struct v4l2_crop *a)
1108 struct v4l2_subdev *sd = soc_camera_to_subdev(icd);
1109 return v4l2_subdev_call(sd, video, s_crop, a);
1112 static void soc_camera_device_init(struct device *dev, void *pdata)
1114 dev->platform_data = pdata;
1115 dev->bus = &soc_camera_bus_type;
1116 dev->release = dummy_release;
1119 int soc_camera_host_register(struct soc_camera_host *ici)
1121 struct soc_camera_host *ix;
1124 if (!ici || !ici->ops ||
1125 !ici->ops->try_fmt ||
1126 !ici->ops->set_fmt ||
1127 !ici->ops->set_bus_param ||
1128 !ici->ops->querycap ||
1129 !ici->ops->init_videobuf ||
1130 !ici->ops->reqbufs ||
1132 !ici->ops->remove ||
1137 if (!ici->ops->set_crop)
1138 ici->ops->set_crop = default_s_crop;
1139 if (!ici->ops->get_crop)
1140 ici->ops->get_crop = default_g_crop;
1141 if (!ici->ops->cropcap)
1142 ici->ops->cropcap = default_cropcap;
1144 mutex_lock(&list_lock);
1145 list_for_each_entry(ix, &hosts, list) {
1146 if (ix->nr == ici->nr) {
1152 ret = v4l2_device_register(ici->v4l2_dev.dev, &ici->v4l2_dev);
1156 list_add_tail(&ici->list, &hosts);
1157 mutex_unlock(&list_lock);
1164 mutex_unlock(&list_lock);
1167 EXPORT_SYMBOL(soc_camera_host_register);
1169 /* Unregister all clients! */
1170 void soc_camera_host_unregister(struct soc_camera_host *ici)
1172 struct soc_camera_device *icd;
1174 mutex_lock(&list_lock);
1176 list_del(&ici->list);
1178 list_for_each_entry(icd, &devices, list) {
1179 if (icd->iface == ici->nr) {
1180 void *pdata = icd->dev.platform_data;
1181 /* The bus->remove will be called */
1182 device_unregister(&icd->dev);
1184 * Not before device_unregister(), .remove
1185 * needs parent to call ici->ops->remove().
1186 * If the host module is loaded again, device_register()
1187 * would complain "already initialised," since 2.6.32
1188 * this is also needed to prevent use-after-free of the
1189 * device private data.
1191 memset(&icd->dev, 0, sizeof(icd->dev));
1192 soc_camera_device_init(&icd->dev, pdata);
1196 mutex_unlock(&list_lock);
1198 v4l2_device_unregister(&ici->v4l2_dev);
1200 EXPORT_SYMBOL(soc_camera_host_unregister);
1202 /* Image capture device */
1203 static int soc_camera_device_register(struct soc_camera_device *icd)
1205 struct soc_camera_device *ix;
1208 for (i = 0; i < 256 && num < 0; i++) {
1210 /* Check if this index is available on this interface */
1211 list_for_each_entry(ix, &devices, list) {
1212 if (ix->iface == icd->iface && ix->devnum == i) {
1221 * ok, we have 256 cameras on this host...
1222 * man, stay reasonable...
1228 icd->host_priv = NULL;
1229 mutex_init(&icd->video_lock);
1231 list_add_tail(&icd->list, &devices);
1236 static void soc_camera_device_unregister(struct soc_camera_device *icd)
1238 list_del(&icd->list);
1241 static const struct v4l2_ioctl_ops soc_camera_ioctl_ops = {
1242 .vidioc_querycap = soc_camera_querycap,
1243 .vidioc_g_fmt_vid_cap = soc_camera_g_fmt_vid_cap,
1244 .vidioc_enum_fmt_vid_cap = soc_camera_enum_fmt_vid_cap,
1245 .vidioc_s_fmt_vid_cap = soc_camera_s_fmt_vid_cap,
1246 .vidioc_enum_input = soc_camera_enum_input,
1247 .vidioc_g_input = soc_camera_g_input,
1248 .vidioc_s_input = soc_camera_s_input,
1249 .vidioc_s_std = soc_camera_s_std,
1250 .vidioc_reqbufs = soc_camera_reqbufs,
1251 .vidioc_try_fmt_vid_cap = soc_camera_try_fmt_vid_cap,
1252 .vidioc_querybuf = soc_camera_querybuf,
1253 .vidioc_qbuf = soc_camera_qbuf,
1254 .vidioc_dqbuf = soc_camera_dqbuf,
1255 .vidioc_streamon = soc_camera_streamon,
1256 .vidioc_streamoff = soc_camera_streamoff,
1257 .vidioc_queryctrl = soc_camera_queryctrl,
1258 .vidioc_g_ctrl = soc_camera_g_ctrl,
1259 .vidioc_s_ctrl = soc_camera_s_ctrl,
1260 .vidioc_cropcap = soc_camera_cropcap,
1261 .vidioc_g_crop = soc_camera_g_crop,
1262 .vidioc_s_crop = soc_camera_s_crop,
1263 .vidioc_g_chip_ident = soc_camera_g_chip_ident,
1264 #ifdef CONFIG_VIDEO_ADV_DEBUG
1265 .vidioc_g_register = soc_camera_g_register,
1266 .vidioc_s_register = soc_camera_s_register,
1270 static int video_dev_create(struct soc_camera_device *icd)
1272 struct soc_camera_host *ici = to_soc_camera_host(icd->dev.parent);
1273 struct video_device *vdev = video_device_alloc();
1278 strlcpy(vdev->name, ici->drv_name, sizeof(vdev->name));
1280 vdev->parent = &icd->dev;
1281 vdev->current_norm = V4L2_STD_UNKNOWN;
1282 vdev->fops = &soc_camera_fops;
1283 vdev->ioctl_ops = &soc_camera_ioctl_ops;
1284 vdev->release = video_device_release;
1285 vdev->tvnorms = V4L2_STD_UNKNOWN;
1293 * Called from soc_camera_probe() above (with .video_lock held???)
1295 static int soc_camera_video_start(struct soc_camera_device *icd)
1299 if (!icd->dev.parent)
1303 !icd->ops->query_bus_param ||
1304 !icd->ops->set_bus_param)
1307 ret = video_register_device(icd->vdev, VFL_TYPE_GRABBER, -1);
1309 dev_err(&icd->dev, "video_register_device failed: %d\n", ret);
1316 static int __devinit soc_camera_pdrv_probe(struct platform_device *pdev)
1318 struct soc_camera_link *icl = pdev->dev.platform_data;
1319 struct soc_camera_device *icd;
1325 icd = kzalloc(sizeof(*icd), GFP_KERNEL);
1329 icd->iface = icl->bus_id;
1330 icd->pdev = &pdev->dev;
1331 platform_set_drvdata(pdev, icd);
1333 ret = soc_camera_device_register(icd);
1337 soc_camera_device_init(&icd->dev, icl);
1339 icd->user_width = DEFAULT_WIDTH;
1340 icd->user_height = DEFAULT_HEIGHT;
1351 * Only called on rmmod for each platform device, since they are not
1352 * hot-pluggable. Now we know, that all our users - hosts and devices have
1353 * been unloaded already
1355 static int __devexit soc_camera_pdrv_remove(struct platform_device *pdev)
1357 struct soc_camera_device *icd = platform_get_drvdata(pdev);
1362 soc_camera_device_unregister(icd);
1369 static struct platform_driver __refdata soc_camera_pdrv = {
1370 .remove = __devexit_p(soc_camera_pdrv_remove),
1372 .name = "soc-camera-pdrv",
1373 .owner = THIS_MODULE,
1377 static int __init soc_camera_init(void)
1379 int ret = bus_register(&soc_camera_bus_type);
1382 ret = driver_register(&ic_drv);
1386 ret = platform_driver_probe(&soc_camera_pdrv, soc_camera_pdrv_probe);
1393 driver_unregister(&ic_drv);
1395 bus_unregister(&soc_camera_bus_type);
1399 static void __exit soc_camera_exit(void)
1401 platform_driver_unregister(&soc_camera_pdrv);
1402 driver_unregister(&ic_drv);
1403 bus_unregister(&soc_camera_bus_type);
1406 module_init(soc_camera_init);
1407 module_exit(soc_camera_exit);
1409 MODULE_DESCRIPTION("Image capture bus driver");
1410 MODULE_AUTHOR("Guennadi Liakhovetski <kernel@pengutronix.de>");
1411 MODULE_LICENSE("GPL");
1412 MODULE_ALIAS("platform:soc-camera-pdrv");