2 * camera image capture (abstract) bus driver
4 * Copyright (C) 2008, Guennadi Liakhovetski <kernel@pengutronix.de>
6 * This driver provides an interface between platform-specific camera
7 * busses and camera devices. It should be used if the camera is
8 * connected not over a "proper" bus like PCI or USB, but over a
9 * special bus, like, for example, the Quick Capture interface on PXA270
10 * SoCs. Later it should also be used for i.MX31 SoCs from Freescale.
11 * It can handle multiple cameras and / or multiple busses, which can
12 * be used, e.g., in stereo-vision applications.
14 * This program is free software; you can redistribute it and/or modify
15 * it under the terms of the GNU General Public License version 2 as
16 * published by the Free Software Foundation.
19 #include <linux/device.h>
20 #include <linux/err.h>
21 #include <linux/i2c.h>
22 #include <linux/init.h>
23 #include <linux/list.h>
24 #include <linux/mutex.h>
25 #include <linux/module.h>
26 #include <linux/platform_device.h>
27 #include <linux/slab.h>
28 #include <linux/pm_runtime.h>
29 #include <linux/vmalloc.h>
31 #include <media/soc_camera.h>
32 #include <media/v4l2-common.h>
33 #include <media/v4l2-ioctl.h>
34 #include <media/v4l2-dev.h>
35 #include <media/videobuf-core.h>
36 #include <media/soc_mediabus.h>
38 /* Default to VGA resolution */
39 #define DEFAULT_WIDTH 640
40 #define DEFAULT_HEIGHT 480
42 static LIST_HEAD(hosts);
43 static LIST_HEAD(devices);
44 static DEFINE_MUTEX(list_lock); /* Protects the list of hosts */
46 const struct soc_camera_format_xlate *soc_camera_xlate_by_fourcc(
47 struct soc_camera_device *icd, unsigned int fourcc)
51 for (i = 0; i < icd->num_user_formats; i++)
52 if (icd->user_formats[i].host_fmt->fourcc == fourcc)
53 return icd->user_formats + i;
56 EXPORT_SYMBOL(soc_camera_xlate_by_fourcc);
59 * soc_camera_apply_sensor_flags() - apply platform SOCAM_SENSOR_INVERT_* flags
60 * @icl: camera platform parameters
61 * @flags: flags to be inverted according to platform configuration
62 * @return: resulting flags
64 unsigned long soc_camera_apply_sensor_flags(struct soc_camera_link *icl,
69 /* If only one of the two polarities is supported, switch to the opposite */
70 if (icl->flags & SOCAM_SENSOR_INVERT_HSYNC) {
71 f = flags & (SOCAM_HSYNC_ACTIVE_HIGH | SOCAM_HSYNC_ACTIVE_LOW);
72 if (f == SOCAM_HSYNC_ACTIVE_HIGH || f == SOCAM_HSYNC_ACTIVE_LOW)
73 flags ^= SOCAM_HSYNC_ACTIVE_HIGH | SOCAM_HSYNC_ACTIVE_LOW;
76 if (icl->flags & SOCAM_SENSOR_INVERT_VSYNC) {
77 f = flags & (SOCAM_VSYNC_ACTIVE_HIGH | SOCAM_VSYNC_ACTIVE_LOW);
78 if (f == SOCAM_VSYNC_ACTIVE_HIGH || f == SOCAM_VSYNC_ACTIVE_LOW)
79 flags ^= SOCAM_VSYNC_ACTIVE_HIGH | SOCAM_VSYNC_ACTIVE_LOW;
82 if (icl->flags & SOCAM_SENSOR_INVERT_PCLK) {
83 f = flags & (SOCAM_PCLK_SAMPLE_RISING | SOCAM_PCLK_SAMPLE_FALLING);
84 if (f == SOCAM_PCLK_SAMPLE_RISING || f == SOCAM_PCLK_SAMPLE_FALLING)
85 flags ^= SOCAM_PCLK_SAMPLE_RISING | SOCAM_PCLK_SAMPLE_FALLING;
90 EXPORT_SYMBOL(soc_camera_apply_sensor_flags);
92 static int soc_camera_try_fmt_vid_cap(struct file *file, void *priv,
93 struct v4l2_format *f)
95 struct soc_camera_device *icd = file->private_data;
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_device *icd = file->private_data;
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_device *icd = file->private_data;
143 struct v4l2_subdev *sd = soc_camera_to_subdev(icd);
145 return v4l2_subdev_call(sd, core, s_std, *a);
148 static int soc_camera_reqbufs(struct file *file, void *priv,
149 struct v4l2_requestbuffers *p)
152 struct soc_camera_device *icd = file->private_data;
153 struct soc_camera_host *ici = to_soc_camera_host(icd->dev.parent);
155 WARN_ON(priv != file->private_data);
157 if (icd->streamer && icd->streamer != file)
160 ret = videobuf_reqbufs(&icd->vb_vidq, p);
164 ret = ici->ops->reqbufs(icd, p);
165 if (!ret && !icd->streamer)
166 icd->streamer = file;
171 static int soc_camera_querybuf(struct file *file, void *priv,
172 struct v4l2_buffer *p)
174 struct soc_camera_device *icd = file->private_data;
176 WARN_ON(priv != file->private_data);
178 return videobuf_querybuf(&icd->vb_vidq, p);
181 static int soc_camera_qbuf(struct file *file, void *priv,
182 struct v4l2_buffer *p)
184 struct soc_camera_device *icd = file->private_data;
186 WARN_ON(priv != file->private_data);
188 if (icd->streamer != file)
191 return videobuf_qbuf(&icd->vb_vidq, p);
194 static int soc_camera_dqbuf(struct file *file, void *priv,
195 struct v4l2_buffer *p)
197 struct soc_camera_device *icd = file->private_data;
199 WARN_ON(priv != file->private_data);
201 if (icd->streamer != file)
204 return videobuf_dqbuf(&icd->vb_vidq, p, file->f_flags & O_NONBLOCK);
207 /* Always entered with .video_lock held */
208 static int soc_camera_init_user_formats(struct soc_camera_device *icd)
210 struct v4l2_subdev *sd = soc_camera_to_subdev(icd);
211 struct soc_camera_host *ici = to_soc_camera_host(icd->dev.parent);
212 unsigned int i, fmts = 0, raw_fmts = 0;
214 enum v4l2_mbus_pixelcode code;
216 while (!v4l2_subdev_call(sd, video, enum_mbus_fmt, raw_fmts, &code))
219 if (!ici->ops->get_formats)
221 * Fallback mode - the host will have to serve all
222 * sensor-provided formats one-to-one to the user
227 * First pass - only count formats this host-sensor
228 * configuration can provide
230 for (i = 0; i < raw_fmts; i++) {
231 ret = ici->ops->get_formats(icd, i, NULL);
241 vmalloc(fmts * sizeof(struct soc_camera_format_xlate));
242 if (!icd->user_formats)
245 icd->num_user_formats = fmts;
247 dev_dbg(&icd->dev, "Found %d supported formats.\n", fmts);
249 /* Second pass - actually fill data formats */
251 for (i = 0; i < raw_fmts; i++)
252 if (!ici->ops->get_formats) {
253 v4l2_subdev_call(sd, video, enum_mbus_fmt, i, &code);
254 icd->user_formats[i].host_fmt =
255 soc_mbus_get_fmtdesc(code);
256 icd->user_formats[i].code = code;
258 ret = ici->ops->get_formats(icd, i,
259 &icd->user_formats[fmts]);
265 icd->current_fmt = &icd->user_formats[0];
270 icd->num_user_formats = 0;
271 vfree(icd->user_formats);
275 /* Always entered with .video_lock held */
276 static void soc_camera_free_user_formats(struct soc_camera_device *icd)
278 struct soc_camera_host *ici = to_soc_camera_host(icd->dev.parent);
280 if (ici->ops->put_formats)
281 ici->ops->put_formats(icd);
282 icd->current_fmt = NULL;
283 icd->num_user_formats = 0;
284 vfree(icd->user_formats);
285 icd->user_formats = NULL;
288 #define pixfmtstr(x) (x) & 0xff, ((x) >> 8) & 0xff, ((x) >> 16) & 0xff, \
291 /* Called with .vb_lock held, or from the first open(2), see comment there */
292 static int soc_camera_set_fmt(struct soc_camera_device *icd,
293 struct v4l2_format *f)
295 struct soc_camera_host *ici = to_soc_camera_host(icd->dev.parent);
296 struct v4l2_pix_format *pix = &f->fmt.pix;
299 dev_dbg(&icd->dev, "S_FMT(%c%c%c%c, %ux%u)\n",
300 pixfmtstr(pix->pixelformat), pix->width, pix->height);
302 /* We always call try_fmt() before set_fmt() or set_crop() */
303 ret = ici->ops->try_fmt(icd, f);
307 ret = ici->ops->set_fmt(icd, f);
310 } else if (!icd->current_fmt ||
311 icd->current_fmt->host_fmt->fourcc != pix->pixelformat) {
313 "Host driver hasn't set up current format correctly!\n");
317 icd->user_width = pix->width;
318 icd->user_height = pix->height;
319 icd->colorspace = pix->colorspace;
321 icd->field = pix->field;
323 if (f->type != V4L2_BUF_TYPE_VIDEO_CAPTURE)
324 dev_warn(&icd->dev, "Attention! Wrong buf-type %d\n",
327 dev_dbg(&icd->dev, "set width: %d height: %d\n",
328 icd->user_width, icd->user_height);
330 /* set physical bus parameters */
331 return ici->ops->set_bus_param(icd, pix->pixelformat);
334 static int soc_camera_open(struct file *file)
336 struct video_device *vdev = video_devdata(file);
337 struct soc_camera_device *icd = container_of(vdev->parent,
338 struct soc_camera_device,
340 struct soc_camera_link *icl = to_soc_camera_link(icd);
341 struct soc_camera_host *ici;
345 /* No device driver attached */
348 ici = to_soc_camera_host(icd->dev.parent);
350 if (!try_module_get(ici->ops->owner)) {
351 dev_err(&icd->dev, "Couldn't lock capture bus driver.\n");
356 * Protect against icd->ops->remove() until we module_get() both
359 mutex_lock(&icd->video_lock);
363 /* Now we really have to activate the camera */
364 if (icd->use_count == 1) {
365 /* Restore parameters before the last close() per V4L2 API */
366 struct v4l2_format f = {
367 .type = V4L2_BUF_TYPE_VIDEO_CAPTURE,
369 .width = icd->user_width,
370 .height = icd->user_height,
372 .colorspace = icd->colorspace,
374 icd->current_fmt->host_fmt->fourcc,
379 ret = icl->power(icd->pdev, 1);
384 /* The camera could have been already on, try to reset */
386 icl->reset(icd->pdev);
388 ret = ici->ops->add(icd);
390 dev_err(&icd->dev, "Couldn't activate the camera: %d\n", ret);
394 pm_runtime_enable(&icd->vdev->dev);
395 ret = pm_runtime_resume(&icd->vdev->dev);
396 if (ret < 0 && ret != -ENOSYS)
400 * Try to configure with default parameters. Notice: this is the
401 * very first open, so, we cannot race against other calls,
402 * apart from someone else calling open() simultaneously, but
403 * .video_lock is protecting us against it.
405 ret = soc_camera_set_fmt(icd, &f);
409 ici->ops->init_videobuf(&icd->vb_vidq, icd);
412 file->private_data = icd;
413 dev_dbg(&icd->dev, "camera device open\n");
415 mutex_unlock(&icd->video_lock);
420 * First four errors are entered with the .video_lock held
424 pm_runtime_disable(&icd->vdev->dev);
426 ici->ops->remove(icd);
429 icl->power(icd->pdev, 0);
432 mutex_unlock(&icd->video_lock);
433 module_put(ici->ops->owner);
438 static int soc_camera_close(struct file *file)
440 struct soc_camera_device *icd = file->private_data;
441 struct soc_camera_host *ici = to_soc_camera_host(icd->dev.parent);
443 mutex_lock(&icd->video_lock);
445 if (!icd->use_count) {
446 struct soc_camera_link *icl = to_soc_camera_link(icd);
448 pm_runtime_suspend(&icd->vdev->dev);
449 pm_runtime_disable(&icd->vdev->dev);
451 ici->ops->remove(icd);
454 icl->power(icd->pdev, 0);
457 if (icd->streamer == file)
458 icd->streamer = NULL;
460 mutex_unlock(&icd->video_lock);
462 module_put(ici->ops->owner);
464 dev_dbg(&icd->dev, "camera device close\n");
469 static ssize_t soc_camera_read(struct file *file, char __user *buf,
470 size_t count, loff_t *ppos)
472 struct soc_camera_device *icd = file->private_data;
475 dev_err(&icd->dev, "camera device read not implemented\n");
480 static int soc_camera_mmap(struct file *file, struct vm_area_struct *vma)
482 struct soc_camera_device *icd = file->private_data;
485 dev_dbg(&icd->dev, "mmap called, vma=0x%08lx\n", (unsigned long)vma);
487 if (icd->streamer != file)
490 err = videobuf_mmap_mapper(&icd->vb_vidq, vma);
492 dev_dbg(&icd->dev, "vma start=0x%08lx, size=%ld, ret=%d\n",
493 (unsigned long)vma->vm_start,
494 (unsigned long)vma->vm_end - (unsigned long)vma->vm_start,
500 static unsigned int soc_camera_poll(struct file *file, poll_table *pt)
502 struct soc_camera_device *icd = file->private_data;
503 struct soc_camera_host *ici = to_soc_camera_host(icd->dev.parent);
505 if (icd->streamer != file)
508 if (list_empty(&icd->vb_vidq.stream)) {
509 dev_err(&icd->dev, "Trying to poll with no queued buffers!\n");
513 return ici->ops->poll(file, pt);
516 static struct v4l2_file_operations soc_camera_fops = {
517 .owner = THIS_MODULE,
518 .open = soc_camera_open,
519 .release = soc_camera_close,
520 .ioctl = video_ioctl2,
521 .read = soc_camera_read,
522 .mmap = soc_camera_mmap,
523 .poll = soc_camera_poll,
526 static int soc_camera_s_fmt_vid_cap(struct file *file, void *priv,
527 struct v4l2_format *f)
529 struct soc_camera_device *icd = file->private_data;
532 WARN_ON(priv != file->private_data);
534 if (icd->streamer && icd->streamer != file)
537 mutex_lock(&icd->vb_vidq.vb_lock);
539 if (icd->vb_vidq.bufs[0]) {
540 dev_err(&icd->dev, "S_FMT denied: queue initialised\n");
545 ret = soc_camera_set_fmt(icd, f);
547 if (!ret && !icd->streamer)
548 icd->streamer = file;
551 mutex_unlock(&icd->vb_vidq.vb_lock);
556 static int soc_camera_enum_fmt_vid_cap(struct file *file, void *priv,
557 struct v4l2_fmtdesc *f)
559 struct soc_camera_device *icd = file->private_data;
560 const struct soc_mbus_pixelfmt *format;
562 WARN_ON(priv != file->private_data);
564 if (f->index >= icd->num_user_formats)
567 format = icd->user_formats[f->index].host_fmt;
570 strlcpy(f->description, format->name, sizeof(f->description));
571 f->pixelformat = format->fourcc;
575 static int soc_camera_g_fmt_vid_cap(struct file *file, void *priv,
576 struct v4l2_format *f)
578 struct soc_camera_device *icd = file->private_data;
579 struct v4l2_pix_format *pix = &f->fmt.pix;
581 WARN_ON(priv != file->private_data);
583 pix->width = icd->user_width;
584 pix->height = icd->user_height;
585 pix->field = icd->vb_vidq.field;
586 pix->pixelformat = icd->current_fmt->host_fmt->fourcc;
587 pix->bytesperline = soc_mbus_bytes_per_line(pix->width,
588 icd->current_fmt->host_fmt);
589 pix->colorspace = icd->colorspace;
590 if (pix->bytesperline < 0)
591 return pix->bytesperline;
592 pix->sizeimage = pix->height * pix->bytesperline;
593 dev_dbg(&icd->dev, "current_fmt->fourcc: 0x%08x\n",
594 icd->current_fmt->host_fmt->fourcc);
598 static int soc_camera_querycap(struct file *file, void *priv,
599 struct v4l2_capability *cap)
601 struct soc_camera_device *icd = file->private_data;
602 struct soc_camera_host *ici = to_soc_camera_host(icd->dev.parent);
604 WARN_ON(priv != file->private_data);
606 strlcpy(cap->driver, ici->drv_name, sizeof(cap->driver));
607 return ici->ops->querycap(ici, cap);
610 static int soc_camera_streamon(struct file *file, void *priv,
611 enum v4l2_buf_type i)
613 struct soc_camera_device *icd = file->private_data;
614 struct v4l2_subdev *sd = soc_camera_to_subdev(icd);
617 WARN_ON(priv != file->private_data);
619 if (i != V4L2_BUF_TYPE_VIDEO_CAPTURE)
622 if (icd->streamer != file)
625 mutex_lock(&icd->video_lock);
627 v4l2_subdev_call(sd, video, s_stream, 1);
629 /* This calls buf_queue from host driver's videobuf_queue_ops */
630 ret = videobuf_streamon(&icd->vb_vidq);
632 mutex_unlock(&icd->video_lock);
637 static int soc_camera_streamoff(struct file *file, void *priv,
638 enum v4l2_buf_type i)
640 struct soc_camera_device *icd = file->private_data;
641 struct v4l2_subdev *sd = soc_camera_to_subdev(icd);
643 WARN_ON(priv != file->private_data);
645 if (i != V4L2_BUF_TYPE_VIDEO_CAPTURE)
648 if (icd->streamer != file)
651 mutex_lock(&icd->video_lock);
654 * This calls buf_release from host driver's videobuf_queue_ops for all
655 * remaining buffers. When the last buffer is freed, stop capture
657 videobuf_streamoff(&icd->vb_vidq);
659 v4l2_subdev_call(sd, video, s_stream, 0);
661 mutex_unlock(&icd->video_lock);
666 static int soc_camera_queryctrl(struct file *file, void *priv,
667 struct v4l2_queryctrl *qc)
669 struct soc_camera_device *icd = file->private_data;
670 struct soc_camera_host *ici = to_soc_camera_host(icd->dev.parent);
673 WARN_ON(priv != file->private_data);
678 /* First check host controls */
679 for (i = 0; i < ici->ops->num_controls; i++)
680 if (qc->id == ici->ops->controls[i].id) {
681 memcpy(qc, &(ici->ops->controls[i]),
686 /* Then device controls */
687 for (i = 0; i < icd->ops->num_controls; i++)
688 if (qc->id == icd->ops->controls[i].id) {
689 memcpy(qc, &(icd->ops->controls[i]),
697 static int soc_camera_g_ctrl(struct file *file, void *priv,
698 struct v4l2_control *ctrl)
700 struct soc_camera_device *icd = file->private_data;
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->get_ctrl) {
708 ret = ici->ops->get_ctrl(icd, ctrl);
709 if (ret != -ENOIOCTLCMD)
713 return v4l2_subdev_call(sd, core, g_ctrl, ctrl);
716 static int soc_camera_s_ctrl(struct file *file, void *priv,
717 struct v4l2_control *ctrl)
719 struct soc_camera_device *icd = file->private_data;
720 struct soc_camera_host *ici = to_soc_camera_host(icd->dev.parent);
721 struct v4l2_subdev *sd = soc_camera_to_subdev(icd);
724 WARN_ON(priv != file->private_data);
726 if (ici->ops->set_ctrl) {
727 ret = ici->ops->set_ctrl(icd, ctrl);
728 if (ret != -ENOIOCTLCMD)
732 return v4l2_subdev_call(sd, core, s_ctrl, ctrl);
735 static int soc_camera_cropcap(struct file *file, void *fh,
736 struct v4l2_cropcap *a)
738 struct soc_camera_device *icd = file->private_data;
739 struct soc_camera_host *ici = to_soc_camera_host(icd->dev.parent);
741 return ici->ops->cropcap(icd, a);
744 static int soc_camera_g_crop(struct file *file, void *fh,
747 struct soc_camera_device *icd = file->private_data;
748 struct soc_camera_host *ici = to_soc_camera_host(icd->dev.parent);
751 mutex_lock(&icd->vb_vidq.vb_lock);
752 ret = ici->ops->get_crop(icd, a);
753 mutex_unlock(&icd->vb_vidq.vb_lock);
759 * According to the V4L2 API, drivers shall not update the struct v4l2_crop
760 * argument with the actual geometry, instead, the user shall use G_CROP to
763 static int soc_camera_s_crop(struct file *file, void *fh,
766 struct soc_camera_device *icd = file->private_data;
767 struct soc_camera_host *ici = to_soc_camera_host(icd->dev.parent);
768 struct v4l2_rect *rect = &a->c;
769 struct v4l2_crop current_crop;
772 if (a->type != V4L2_BUF_TYPE_VIDEO_CAPTURE)
775 dev_dbg(&icd->dev, "S_CROP(%ux%u@%u:%u)\n",
776 rect->width, rect->height, rect->left, rect->top);
778 /* Cropping is allowed during a running capture, guard consistency */
779 mutex_lock(&icd->vb_vidq.vb_lock);
781 /* If get_crop fails, we'll let host and / or client drivers decide */
782 ret = ici->ops->get_crop(icd, ¤t_crop);
784 /* Prohibit window size change with initialised buffers */
787 "S_CROP denied: getting current crop failed\n");
788 } else if (icd->vb_vidq.bufs[0] &&
789 (a->c.width != current_crop.c.width ||
790 a->c.height != current_crop.c.height)) {
792 "S_CROP denied: queue initialised and sizes differ\n");
795 ret = ici->ops->set_crop(icd, a);
798 mutex_unlock(&icd->vb_vidq.vb_lock);
803 static int soc_camera_g_parm(struct file *file, void *fh,
804 struct v4l2_streamparm *a)
806 struct soc_camera_device *icd = file->private_data;
807 struct soc_camera_host *ici = to_soc_camera_host(icd->dev.parent);
809 if (ici->ops->get_parm)
810 return ici->ops->get_parm(icd, a);
815 static int soc_camera_s_parm(struct file *file, void *fh,
816 struct v4l2_streamparm *a)
818 struct soc_camera_device *icd = file->private_data;
819 struct soc_camera_host *ici = to_soc_camera_host(icd->dev.parent);
821 if (ici->ops->set_parm)
822 return ici->ops->set_parm(icd, a);
827 static int soc_camera_g_chip_ident(struct file *file, void *fh,
828 struct v4l2_dbg_chip_ident *id)
830 struct soc_camera_device *icd = file->private_data;
831 struct v4l2_subdev *sd = soc_camera_to_subdev(icd);
833 return v4l2_subdev_call(sd, core, g_chip_ident, id);
836 #ifdef CONFIG_VIDEO_ADV_DEBUG
837 static int soc_camera_g_register(struct file *file, void *fh,
838 struct v4l2_dbg_register *reg)
840 struct soc_camera_device *icd = file->private_data;
841 struct v4l2_subdev *sd = soc_camera_to_subdev(icd);
843 return v4l2_subdev_call(sd, core, g_register, reg);
846 static int soc_camera_s_register(struct file *file, void *fh,
847 struct v4l2_dbg_register *reg)
849 struct soc_camera_device *icd = file->private_data;
850 struct v4l2_subdev *sd = soc_camera_to_subdev(icd);
852 return v4l2_subdev_call(sd, core, s_register, reg);
856 /* So far this function cannot fail */
857 static void scan_add_host(struct soc_camera_host *ici)
859 struct soc_camera_device *icd;
861 mutex_lock(&list_lock);
863 list_for_each_entry(icd, &devices, list) {
864 if (icd->iface == ici->nr) {
866 icd->dev.parent = ici->v4l2_dev.dev;
867 dev_set_name(&icd->dev, "%u-%u", icd->iface,
869 ret = device_register(&icd->dev);
871 icd->dev.parent = NULL;
873 "Cannot register device: %d\n", ret);
878 mutex_unlock(&list_lock);
881 #ifdef CONFIG_I2C_BOARDINFO
882 static int soc_camera_init_i2c(struct soc_camera_device *icd,
883 struct soc_camera_link *icl)
885 struct i2c_client *client;
886 struct soc_camera_host *ici = to_soc_camera_host(icd->dev.parent);
887 struct i2c_adapter *adap = i2c_get_adapter(icl->i2c_adapter_id);
888 struct v4l2_subdev *subdev;
891 dev_err(&icd->dev, "Cannot get I2C adapter #%d. No driver?\n",
892 icl->i2c_adapter_id);
896 icl->board_info->platform_data = icd;
898 subdev = v4l2_i2c_new_subdev_board(&ici->v4l2_dev, adap,
899 icl->board_info, NULL);
903 client = v4l2_get_subdevdata(subdev);
905 /* Use to_i2c_client(dev) to recover the i2c client */
906 dev_set_drvdata(&icd->dev, &client->dev);
910 i2c_put_adapter(adap);
915 static void soc_camera_free_i2c(struct soc_camera_device *icd)
917 struct i2c_client *client =
918 to_i2c_client(to_soc_camera_control(icd));
919 dev_set_drvdata(&icd->dev, NULL);
920 v4l2_device_unregister_subdev(i2c_get_clientdata(client));
921 i2c_unregister_device(client);
922 i2c_put_adapter(client->adapter);
925 #define soc_camera_init_i2c(icd, icl) (-ENODEV)
926 #define soc_camera_free_i2c(icd) do {} while (0)
929 static int soc_camera_video_start(struct soc_camera_device *icd);
930 static int video_dev_create(struct soc_camera_device *icd);
931 /* Called during host-driver probe */
932 static int soc_camera_probe(struct device *dev)
934 struct soc_camera_device *icd = to_soc_camera_dev(dev);
935 struct soc_camera_host *ici = to_soc_camera_host(dev->parent);
936 struct soc_camera_link *icl = to_soc_camera_link(icd);
937 struct device *control = NULL;
938 struct v4l2_subdev *sd;
939 struct v4l2_mbus_framefmt mf;
942 dev_info(dev, "Probing %s\n", dev_name(dev));
945 ret = icl->power(icd->pdev, 1);
948 "Platform failed to power-on the camera.\n");
953 /* The camera could have been already on, try to reset */
955 icl->reset(icd->pdev);
957 ret = ici->ops->add(icd);
961 /* Must have icd->vdev before registering the device */
962 ret = video_dev_create(icd);
966 /* Non-i2c cameras, e.g., soc_camera_platform, have no board_info */
967 if (icl->board_info) {
968 ret = soc_camera_init_i2c(icd, icl);
971 } else if (!icl->add_device || !icl->del_device) {
975 if (icl->module_name)
976 ret = request_module(icl->module_name);
978 ret = icl->add_device(icl, &icd->dev);
983 * FIXME: this is racy, have to use driver-binding notification,
984 * when it is available
986 control = to_soc_camera_control(icd);
987 if (!control || !control->driver || !dev_get_drvdata(control) ||
988 !try_module_get(control->driver->owner)) {
989 icl->del_device(icl);
994 /* At this point client .probe() should have run already */
995 ret = soc_camera_init_user_formats(icd);
999 icd->field = V4L2_FIELD_ANY;
1001 /* ..._video_start() will create a device node, so we have to protect */
1002 mutex_lock(&icd->video_lock);
1004 ret = soc_camera_video_start(icd);
1008 /* Try to improve our guess of a reasonable window format */
1009 sd = soc_camera_to_subdev(icd);
1010 if (!v4l2_subdev_call(sd, video, g_mbus_fmt, &mf)) {
1011 icd->user_width = mf.width;
1012 icd->user_height = mf.height;
1013 icd->colorspace = mf.colorspace;
1014 icd->field = mf.field;
1017 /* Do we have to sysfs_remove_link() before device_unregister()? */
1018 if (sysfs_create_link(&icd->dev.kobj, &to_soc_camera_control(icd)->kobj,
1020 dev_warn(&icd->dev, "Failed creating the control symlink\n");
1022 ici->ops->remove(icd);
1025 icl->power(icd->pdev, 0);
1027 mutex_unlock(&icd->video_lock);
1032 mutex_unlock(&icd->video_lock);
1033 soc_camera_free_user_formats(icd);
1035 if (icl->board_info) {
1036 soc_camera_free_i2c(icd);
1038 icl->del_device(icl);
1039 module_put(control->driver->owner);
1043 video_device_release(icd->vdev);
1045 ici->ops->remove(icd);
1048 icl->power(icd->pdev, 0);
1054 * This is called on device_unregister, which only means we have to disconnect
1055 * from the host, but not remove ourselves from the device list
1057 static int soc_camera_remove(struct device *dev)
1059 struct soc_camera_device *icd = to_soc_camera_dev(dev);
1060 struct soc_camera_link *icl = to_soc_camera_link(icd);
1061 struct video_device *vdev = icd->vdev;
1063 BUG_ON(!dev->parent);
1066 mutex_lock(&icd->video_lock);
1067 video_unregister_device(vdev);
1069 mutex_unlock(&icd->video_lock);
1072 if (icl->board_info) {
1073 soc_camera_free_i2c(icd);
1075 struct device_driver *drv = to_soc_camera_control(icd) ?
1076 to_soc_camera_control(icd)->driver : NULL;
1078 icl->del_device(icl);
1079 module_put(drv->owner);
1082 soc_camera_free_user_formats(icd);
1087 static int soc_camera_suspend(struct device *dev, pm_message_t state)
1089 struct soc_camera_device *icd = to_soc_camera_dev(dev);
1090 struct soc_camera_host *ici = to_soc_camera_host(icd->dev.parent);
1093 if (ici->ops->suspend)
1094 ret = ici->ops->suspend(icd, state);
1099 static int soc_camera_resume(struct device *dev)
1101 struct soc_camera_device *icd = to_soc_camera_dev(dev);
1102 struct soc_camera_host *ici = to_soc_camera_host(icd->dev.parent);
1105 if (ici->ops->resume)
1106 ret = ici->ops->resume(icd);
1111 struct bus_type soc_camera_bus_type = {
1112 .name = "soc-camera",
1113 .probe = soc_camera_probe,
1114 .remove = soc_camera_remove,
1115 .suspend = soc_camera_suspend,
1116 .resume = soc_camera_resume,
1118 EXPORT_SYMBOL_GPL(soc_camera_bus_type);
1120 static struct device_driver ic_drv = {
1122 .bus = &soc_camera_bus_type,
1123 .owner = THIS_MODULE,
1126 static void dummy_release(struct device *dev)
1130 static int default_cropcap(struct soc_camera_device *icd,
1131 struct v4l2_cropcap *a)
1133 struct v4l2_subdev *sd = soc_camera_to_subdev(icd);
1134 return v4l2_subdev_call(sd, video, cropcap, a);
1137 static int default_g_crop(struct soc_camera_device *icd, struct v4l2_crop *a)
1139 struct v4l2_subdev *sd = soc_camera_to_subdev(icd);
1140 return v4l2_subdev_call(sd, video, g_crop, a);
1143 static int default_s_crop(struct soc_camera_device *icd, struct v4l2_crop *a)
1145 struct v4l2_subdev *sd = soc_camera_to_subdev(icd);
1146 return v4l2_subdev_call(sd, video, s_crop, a);
1149 static int default_g_parm(struct soc_camera_device *icd,
1150 struct v4l2_streamparm *parm)
1152 struct v4l2_subdev *sd = soc_camera_to_subdev(icd);
1153 return v4l2_subdev_call(sd, video, g_parm, parm);
1156 static int default_s_parm(struct soc_camera_device *icd,
1157 struct v4l2_streamparm *parm)
1159 struct v4l2_subdev *sd = soc_camera_to_subdev(icd);
1160 return v4l2_subdev_call(sd, video, s_parm, parm);
1163 static void soc_camera_device_init(struct device *dev, void *pdata)
1165 dev->platform_data = pdata;
1166 dev->bus = &soc_camera_bus_type;
1167 dev->release = dummy_release;
1170 int soc_camera_host_register(struct soc_camera_host *ici)
1172 struct soc_camera_host *ix;
1175 if (!ici || !ici->ops ||
1176 !ici->ops->try_fmt ||
1177 !ici->ops->set_fmt ||
1178 !ici->ops->set_bus_param ||
1179 !ici->ops->querycap ||
1180 !ici->ops->init_videobuf ||
1181 !ici->ops->reqbufs ||
1183 !ici->ops->remove ||
1188 if (!ici->ops->set_crop)
1189 ici->ops->set_crop = default_s_crop;
1190 if (!ici->ops->get_crop)
1191 ici->ops->get_crop = default_g_crop;
1192 if (!ici->ops->cropcap)
1193 ici->ops->cropcap = default_cropcap;
1194 if (!ici->ops->set_parm)
1195 ici->ops->set_parm = default_s_parm;
1196 if (!ici->ops->get_parm)
1197 ici->ops->get_parm = default_g_parm;
1199 mutex_lock(&list_lock);
1200 list_for_each_entry(ix, &hosts, list) {
1201 if (ix->nr == ici->nr) {
1207 ret = v4l2_device_register(ici->v4l2_dev.dev, &ici->v4l2_dev);
1211 list_add_tail(&ici->list, &hosts);
1212 mutex_unlock(&list_lock);
1219 mutex_unlock(&list_lock);
1222 EXPORT_SYMBOL(soc_camera_host_register);
1224 /* Unregister all clients! */
1225 void soc_camera_host_unregister(struct soc_camera_host *ici)
1227 struct soc_camera_device *icd;
1229 mutex_lock(&list_lock);
1231 list_del(&ici->list);
1233 list_for_each_entry(icd, &devices, list) {
1234 if (icd->iface == ici->nr) {
1235 void *pdata = icd->dev.platform_data;
1236 /* The bus->remove will be called */
1237 device_unregister(&icd->dev);
1239 * Not before device_unregister(), .remove
1240 * needs parent to call ici->ops->remove().
1241 * If the host module is loaded again, device_register()
1242 * would complain "already initialised," since 2.6.32
1243 * this is also needed to prevent use-after-free of the
1244 * device private data.
1246 memset(&icd->dev, 0, sizeof(icd->dev));
1247 soc_camera_device_init(&icd->dev, pdata);
1251 mutex_unlock(&list_lock);
1253 v4l2_device_unregister(&ici->v4l2_dev);
1255 EXPORT_SYMBOL(soc_camera_host_unregister);
1257 /* Image capture device */
1258 static int soc_camera_device_register(struct soc_camera_device *icd)
1260 struct soc_camera_device *ix;
1263 for (i = 0; i < 256 && num < 0; i++) {
1265 /* Check if this index is available on this interface */
1266 list_for_each_entry(ix, &devices, list) {
1267 if (ix->iface == icd->iface && ix->devnum == i) {
1276 * ok, we have 256 cameras on this host...
1277 * man, stay reasonable...
1283 icd->host_priv = NULL;
1284 mutex_init(&icd->video_lock);
1286 list_add_tail(&icd->list, &devices);
1291 static void soc_camera_device_unregister(struct soc_camera_device *icd)
1293 list_del(&icd->list);
1296 static const struct v4l2_ioctl_ops soc_camera_ioctl_ops = {
1297 .vidioc_querycap = soc_camera_querycap,
1298 .vidioc_g_fmt_vid_cap = soc_camera_g_fmt_vid_cap,
1299 .vidioc_enum_fmt_vid_cap = soc_camera_enum_fmt_vid_cap,
1300 .vidioc_s_fmt_vid_cap = soc_camera_s_fmt_vid_cap,
1301 .vidioc_enum_input = soc_camera_enum_input,
1302 .vidioc_g_input = soc_camera_g_input,
1303 .vidioc_s_input = soc_camera_s_input,
1304 .vidioc_s_std = soc_camera_s_std,
1305 .vidioc_reqbufs = soc_camera_reqbufs,
1306 .vidioc_try_fmt_vid_cap = soc_camera_try_fmt_vid_cap,
1307 .vidioc_querybuf = soc_camera_querybuf,
1308 .vidioc_qbuf = soc_camera_qbuf,
1309 .vidioc_dqbuf = soc_camera_dqbuf,
1310 .vidioc_streamon = soc_camera_streamon,
1311 .vidioc_streamoff = soc_camera_streamoff,
1312 .vidioc_queryctrl = soc_camera_queryctrl,
1313 .vidioc_g_ctrl = soc_camera_g_ctrl,
1314 .vidioc_s_ctrl = soc_camera_s_ctrl,
1315 .vidioc_cropcap = soc_camera_cropcap,
1316 .vidioc_g_crop = soc_camera_g_crop,
1317 .vidioc_s_crop = soc_camera_s_crop,
1318 .vidioc_g_parm = soc_camera_g_parm,
1319 .vidioc_s_parm = soc_camera_s_parm,
1320 .vidioc_g_chip_ident = soc_camera_g_chip_ident,
1321 #ifdef CONFIG_VIDEO_ADV_DEBUG
1322 .vidioc_g_register = soc_camera_g_register,
1323 .vidioc_s_register = soc_camera_s_register,
1327 static int video_dev_create(struct soc_camera_device *icd)
1329 struct soc_camera_host *ici = to_soc_camera_host(icd->dev.parent);
1330 struct video_device *vdev = video_device_alloc();
1335 strlcpy(vdev->name, ici->drv_name, sizeof(vdev->name));
1337 vdev->parent = &icd->dev;
1338 vdev->current_norm = V4L2_STD_UNKNOWN;
1339 vdev->fops = &soc_camera_fops;
1340 vdev->ioctl_ops = &soc_camera_ioctl_ops;
1341 vdev->release = video_device_release;
1342 vdev->tvnorms = V4L2_STD_UNKNOWN;
1350 * Called from soc_camera_probe() above (with .video_lock held???)
1352 static int soc_camera_video_start(struct soc_camera_device *icd)
1354 struct device_type *type = icd->vdev->dev.type;
1357 if (!icd->dev.parent)
1361 !icd->ops->query_bus_param ||
1362 !icd->ops->set_bus_param)
1365 ret = video_register_device(icd->vdev, VFL_TYPE_GRABBER, -1);
1367 dev_err(&icd->dev, "video_register_device failed: %d\n", ret);
1371 /* Restore device type, possibly set by the subdevice driver */
1372 icd->vdev->dev.type = type;
1377 static int __devinit soc_camera_pdrv_probe(struct platform_device *pdev)
1379 struct soc_camera_link *icl = pdev->dev.platform_data;
1380 struct soc_camera_device *icd;
1386 icd = kzalloc(sizeof(*icd), GFP_KERNEL);
1390 icd->iface = icl->bus_id;
1391 icd->pdev = &pdev->dev;
1392 platform_set_drvdata(pdev, icd);
1394 ret = soc_camera_device_register(icd);
1398 soc_camera_device_init(&icd->dev, icl);
1400 icd->user_width = DEFAULT_WIDTH;
1401 icd->user_height = DEFAULT_HEIGHT;
1412 * Only called on rmmod for each platform device, since they are not
1413 * hot-pluggable. Now we know, that all our users - hosts and devices have
1414 * been unloaded already
1416 static int __devexit soc_camera_pdrv_remove(struct platform_device *pdev)
1418 struct soc_camera_device *icd = platform_get_drvdata(pdev);
1423 soc_camera_device_unregister(icd);
1430 static struct platform_driver __refdata soc_camera_pdrv = {
1431 .remove = __devexit_p(soc_camera_pdrv_remove),
1433 .name = "soc-camera-pdrv",
1434 .owner = THIS_MODULE,
1438 static int __init soc_camera_init(void)
1440 int ret = bus_register(&soc_camera_bus_type);
1443 ret = driver_register(&ic_drv);
1447 ret = platform_driver_probe(&soc_camera_pdrv, soc_camera_pdrv_probe);
1454 driver_unregister(&ic_drv);
1456 bus_unregister(&soc_camera_bus_type);
1460 static void __exit soc_camera_exit(void)
1462 platform_driver_unregister(&soc_camera_pdrv);
1463 driver_unregister(&ic_drv);
1464 bus_unregister(&soc_camera_bus_type);
1467 module_init(soc_camera_init);
1468 module_exit(soc_camera_exit);
1470 MODULE_DESCRIPTION("Image capture bus driver");
1471 MODULE_AUTHOR("Guennadi Liakhovetski <kernel@pengutronix.de>");
1472 MODULE_LICENSE("GPL");
1473 MODULE_ALIAS("platform:soc-camera-pdrv");