2 * camera image capture (abstract) bus driver
4 * Copyright (C) 2008, Guennadi Liakhovetski <kernel@pengutronix.de>
6 * This driver provides an interface between platform-specific camera
7 * busses and camera devices. It should be used if the camera is
8 * connected not over a "proper" bus like PCI or USB, but over a
9 * special bus, like, for example, the Quick Capture interface on PXA270
10 * SoCs. Later it should also be used for i.MX31 SoCs from Freescale.
11 * It can handle multiple cameras and / or multiple busses, which can
12 * be used, e.g., in stereo-vision applications.
14 * This program is free software; you can redistribute it and/or modify
15 * it under the terms of the GNU General Public License version 2 as
16 * published by the Free Software Foundation.
19 #include <linux/device.h>
20 #include <linux/err.h>
21 #include <linux/i2c.h>
22 #include <linux/init.h>
23 #include <linux/list.h>
24 #include <linux/mutex.h>
25 #include <linux/module.h>
26 #include <linux/platform_device.h>
27 #include <linux/regulator/consumer.h>
28 #include <linux/slab.h>
29 #include <linux/pm_runtime.h>
30 #include <linux/vmalloc.h>
32 #include <media/soc_camera.h>
33 #include <media/v4l2-common.h>
34 #include <media/v4l2-ioctl.h>
35 #include <media/v4l2-dev.h>
36 #include <media/videobuf-core.h>
37 #include <media/videobuf2-core.h>
38 #include <media/soc_mediabus.h>
40 /* Default to VGA resolution */
41 #define DEFAULT_WIDTH 640
42 #define DEFAULT_HEIGHT 480
44 #define is_streaming(ici, icd) \
45 (((ici)->ops->init_videobuf) ? \
46 (icd)->vb_vidq.streaming : \
47 vb2_is_streaming(&(icd)->vb2_vidq))
49 static LIST_HEAD(hosts);
50 static LIST_HEAD(devices);
51 static DEFINE_MUTEX(list_lock); /* Protects the list of hosts */
53 static int soc_camera_power_on(struct soc_camera_device *icd,
54 struct soc_camera_link *icl)
56 struct v4l2_subdev *sd = soc_camera_to_subdev(icd);
57 int ret = regulator_bulk_enable(icl->num_regulators,
60 dev_err(icd->pdev, "Cannot enable regulators\n");
65 ret = icl->power(icd->control, 1);
68 "Platform failed to power-on the camera.\n");
73 ret = v4l2_subdev_call(sd, core, s_power, 1);
74 if (ret < 0 && ret != -ENOIOCTLCMD && ret != -ENODEV)
81 icl->power(icd->control, 0);
83 regulator_bulk_disable(icl->num_regulators,
88 static int soc_camera_power_off(struct soc_camera_device *icd,
89 struct soc_camera_link *icl)
91 struct v4l2_subdev *sd = soc_camera_to_subdev(icd);
92 int ret = v4l2_subdev_call(sd, core, s_power, 0);
94 if (ret < 0 && ret != -ENOIOCTLCMD && ret != -ENODEV)
98 ret = icl->power(icd->control, 0);
101 "Platform failed to power-off the camera.\n");
106 ret = regulator_bulk_disable(icl->num_regulators,
109 dev_err(icd->pdev, "Cannot disable regulators\n");
114 const struct soc_camera_format_xlate *soc_camera_xlate_by_fourcc(
115 struct soc_camera_device *icd, unsigned int fourcc)
119 for (i = 0; i < icd->num_user_formats; i++)
120 if (icd->user_formats[i].host_fmt->fourcc == fourcc)
121 return icd->user_formats + i;
124 EXPORT_SYMBOL(soc_camera_xlate_by_fourcc);
127 * soc_camera_apply_board_flags() - apply platform SOCAM_SENSOR_INVERT_* flags
128 * @icl: camera platform parameters
129 * @cfg: media bus configuration
130 * @return: resulting flags
132 unsigned long soc_camera_apply_board_flags(struct soc_camera_link *icl,
133 const struct v4l2_mbus_config *cfg)
135 unsigned long f, flags = cfg->flags;
137 /* If only one of the two polarities is supported, switch to the opposite */
138 if (icl->flags & SOCAM_SENSOR_INVERT_HSYNC) {
139 f = flags & (V4L2_MBUS_HSYNC_ACTIVE_HIGH | V4L2_MBUS_HSYNC_ACTIVE_LOW);
140 if (f == V4L2_MBUS_HSYNC_ACTIVE_HIGH || f == V4L2_MBUS_HSYNC_ACTIVE_LOW)
141 flags ^= V4L2_MBUS_HSYNC_ACTIVE_HIGH | V4L2_MBUS_HSYNC_ACTIVE_LOW;
144 if (icl->flags & SOCAM_SENSOR_INVERT_VSYNC) {
145 f = flags & (V4L2_MBUS_VSYNC_ACTIVE_HIGH | V4L2_MBUS_VSYNC_ACTIVE_LOW);
146 if (f == V4L2_MBUS_VSYNC_ACTIVE_HIGH || f == V4L2_MBUS_VSYNC_ACTIVE_LOW)
147 flags ^= V4L2_MBUS_VSYNC_ACTIVE_HIGH | V4L2_MBUS_VSYNC_ACTIVE_LOW;
150 if (icl->flags & SOCAM_SENSOR_INVERT_PCLK) {
151 f = flags & (V4L2_MBUS_PCLK_SAMPLE_RISING | V4L2_MBUS_PCLK_SAMPLE_FALLING);
152 if (f == V4L2_MBUS_PCLK_SAMPLE_RISING || f == V4L2_MBUS_PCLK_SAMPLE_FALLING)
153 flags ^= V4L2_MBUS_PCLK_SAMPLE_RISING | V4L2_MBUS_PCLK_SAMPLE_FALLING;
158 EXPORT_SYMBOL(soc_camera_apply_board_flags);
160 #define pixfmtstr(x) (x) & 0xff, ((x) >> 8) & 0xff, ((x) >> 16) & 0xff, \
163 static int soc_camera_try_fmt(struct soc_camera_device *icd,
164 struct v4l2_format *f)
166 struct soc_camera_host *ici = to_soc_camera_host(icd->parent);
167 const struct soc_camera_format_xlate *xlate;
168 struct v4l2_pix_format *pix = &f->fmt.pix;
171 dev_dbg(icd->pdev, "TRY_FMT(%c%c%c%c, %ux%u)\n",
172 pixfmtstr(pix->pixelformat), pix->width, pix->height);
174 if (pix->pixelformat != V4L2_PIX_FMT_JPEG &&
175 !(ici->capabilities & SOCAM_HOST_CAP_STRIDE)) {
176 pix->bytesperline = 0;
180 ret = ici->ops->try_fmt(icd, f);
184 xlate = soc_camera_xlate_by_fourcc(icd, pix->pixelformat);
188 ret = soc_mbus_bytes_per_line(pix->width, xlate->host_fmt);
192 pix->bytesperline = max_t(u32, pix->bytesperline, ret);
194 ret = soc_mbus_image_size(xlate->host_fmt, pix->bytesperline,
199 pix->sizeimage = max_t(u32, pix->sizeimage, ret);
204 static int soc_camera_try_fmt_vid_cap(struct file *file, void *priv,
205 struct v4l2_format *f)
207 struct soc_camera_device *icd = file->private_data;
209 WARN_ON(priv != file->private_data);
211 /* Only single-plane capture is supported so far */
212 if (f->type != V4L2_BUF_TYPE_VIDEO_CAPTURE)
215 /* limit format to hardware capabilities */
216 return soc_camera_try_fmt(icd, f);
219 static int soc_camera_enum_input(struct file *file, void *priv,
220 struct v4l2_input *inp)
225 /* default is camera */
226 inp->type = V4L2_INPUT_TYPE_CAMERA;
227 inp->std = V4L2_STD_UNKNOWN;
228 strcpy(inp->name, "Camera");
233 static int soc_camera_g_input(struct file *file, void *priv, unsigned int *i)
240 static int soc_camera_s_input(struct file *file, void *priv, unsigned int i)
248 static int soc_camera_s_std(struct file *file, void *priv, v4l2_std_id *a)
250 struct soc_camera_device *icd = file->private_data;
251 struct v4l2_subdev *sd = soc_camera_to_subdev(icd);
253 return v4l2_subdev_call(sd, core, s_std, *a);
256 static int soc_camera_g_std(struct file *file, void *priv, v4l2_std_id *a)
258 struct soc_camera_device *icd = file->private_data;
259 struct v4l2_subdev *sd = soc_camera_to_subdev(icd);
261 return v4l2_subdev_call(sd, core, g_std, a);
264 static int soc_camera_enum_framesizes(struct file *file, void *fh,
265 struct v4l2_frmsizeenum *fsize)
267 struct soc_camera_device *icd = file->private_data;
268 struct soc_camera_host *ici = to_soc_camera_host(icd->parent);
270 return ici->ops->enum_framesizes(icd, fsize);
273 static int soc_camera_reqbufs(struct file *file, void *priv,
274 struct v4l2_requestbuffers *p)
277 struct soc_camera_device *icd = file->private_data;
278 struct soc_camera_host *ici = to_soc_camera_host(icd->parent);
280 WARN_ON(priv != file->private_data);
282 if (icd->streamer && icd->streamer != file)
285 if (ici->ops->init_videobuf) {
286 ret = videobuf_reqbufs(&icd->vb_vidq, p);
290 ret = ici->ops->reqbufs(icd, p);
292 ret = vb2_reqbufs(&icd->vb2_vidq, p);
295 if (!ret && !icd->streamer)
296 icd->streamer = file;
301 static int soc_camera_querybuf(struct file *file, void *priv,
302 struct v4l2_buffer *p)
304 struct soc_camera_device *icd = file->private_data;
305 struct soc_camera_host *ici = to_soc_camera_host(icd->parent);
307 WARN_ON(priv != file->private_data);
309 if (ici->ops->init_videobuf)
310 return videobuf_querybuf(&icd->vb_vidq, p);
312 return vb2_querybuf(&icd->vb2_vidq, p);
315 static int soc_camera_qbuf(struct file *file, void *priv,
316 struct v4l2_buffer *p)
318 struct soc_camera_device *icd = file->private_data;
319 struct soc_camera_host *ici = to_soc_camera_host(icd->parent);
321 WARN_ON(priv != file->private_data);
323 if (icd->streamer != file)
326 if (ici->ops->init_videobuf)
327 return videobuf_qbuf(&icd->vb_vidq, p);
329 return vb2_qbuf(&icd->vb2_vidq, p);
332 static int soc_camera_dqbuf(struct file *file, void *priv,
333 struct v4l2_buffer *p)
335 struct soc_camera_device *icd = file->private_data;
336 struct soc_camera_host *ici = to_soc_camera_host(icd->parent);
338 WARN_ON(priv != file->private_data);
340 if (icd->streamer != file)
343 if (ici->ops->init_videobuf)
344 return videobuf_dqbuf(&icd->vb_vidq, p, file->f_flags & O_NONBLOCK);
346 return vb2_dqbuf(&icd->vb2_vidq, p, file->f_flags & O_NONBLOCK);
349 static int soc_camera_create_bufs(struct file *file, void *priv,
350 struct v4l2_create_buffers *create)
352 struct soc_camera_device *icd = file->private_data;
353 struct soc_camera_host *ici = to_soc_camera_host(icd->parent);
356 if (ici->ops->init_videobuf)
359 return vb2_create_bufs(&icd->vb2_vidq, create);
362 static int soc_camera_prepare_buf(struct file *file, void *priv,
363 struct v4l2_buffer *b)
365 struct soc_camera_device *icd = file->private_data;
366 struct soc_camera_host *ici = to_soc_camera_host(icd->parent);
369 if (ici->ops->init_videobuf)
372 return vb2_prepare_buf(&icd->vb2_vidq, b);
375 /* Always entered with .video_lock held */
376 static int soc_camera_init_user_formats(struct soc_camera_device *icd)
378 struct v4l2_subdev *sd = soc_camera_to_subdev(icd);
379 struct soc_camera_host *ici = to_soc_camera_host(icd->parent);
380 unsigned int i, fmts = 0, raw_fmts = 0;
382 enum v4l2_mbus_pixelcode code;
384 while (!v4l2_subdev_call(sd, video, enum_mbus_fmt, raw_fmts, &code))
387 if (!ici->ops->get_formats)
389 * Fallback mode - the host will have to serve all
390 * sensor-provided formats one-to-one to the user
395 * First pass - only count formats this host-sensor
396 * configuration can provide
398 for (i = 0; i < raw_fmts; i++) {
399 ret = ici->ops->get_formats(icd, i, NULL);
409 vmalloc(fmts * sizeof(struct soc_camera_format_xlate));
410 if (!icd->user_formats)
413 dev_dbg(icd->pdev, "Found %d supported formats.\n", fmts);
415 /* Second pass - actually fill data formats */
417 for (i = 0; i < raw_fmts; i++)
418 if (!ici->ops->get_formats) {
419 v4l2_subdev_call(sd, video, enum_mbus_fmt, i, &code);
420 icd->user_formats[fmts].host_fmt =
421 soc_mbus_get_fmtdesc(code);
422 if (icd->user_formats[fmts].host_fmt)
423 icd->user_formats[fmts++].code = code;
425 ret = ici->ops->get_formats(icd, i,
426 &icd->user_formats[fmts]);
432 icd->num_user_formats = fmts;
433 icd->current_fmt = &icd->user_formats[0];
438 vfree(icd->user_formats);
442 /* Always entered with .video_lock held */
443 static void soc_camera_free_user_formats(struct soc_camera_device *icd)
445 struct soc_camera_host *ici = to_soc_camera_host(icd->parent);
447 if (ici->ops->put_formats)
448 ici->ops->put_formats(icd);
449 icd->current_fmt = NULL;
450 icd->num_user_formats = 0;
451 vfree(icd->user_formats);
452 icd->user_formats = NULL;
455 /* Called with .vb_lock held, or from the first open(2), see comment there */
456 static int soc_camera_set_fmt(struct soc_camera_device *icd,
457 struct v4l2_format *f)
459 struct soc_camera_host *ici = to_soc_camera_host(icd->parent);
460 struct v4l2_pix_format *pix = &f->fmt.pix;
463 dev_dbg(icd->pdev, "S_FMT(%c%c%c%c, %ux%u)\n",
464 pixfmtstr(pix->pixelformat), pix->width, pix->height);
466 /* We always call try_fmt() before set_fmt() or set_crop() */
467 ret = soc_camera_try_fmt(icd, f);
471 ret = ici->ops->set_fmt(icd, f);
474 } else if (!icd->current_fmt ||
475 icd->current_fmt->host_fmt->fourcc != pix->pixelformat) {
477 "Host driver hasn't set up current format correctly!\n");
481 icd->user_width = pix->width;
482 icd->user_height = pix->height;
483 icd->bytesperline = pix->bytesperline;
484 icd->sizeimage = pix->sizeimage;
485 icd->colorspace = pix->colorspace;
486 icd->field = pix->field;
487 if (ici->ops->init_videobuf)
488 icd->vb_vidq.field = pix->field;
490 dev_dbg(icd->pdev, "set width: %d height: %d\n",
491 icd->user_width, icd->user_height);
493 /* set physical bus parameters */
494 return ici->ops->set_bus_param(icd);
497 static int soc_camera_open(struct file *file)
499 struct video_device *vdev = video_devdata(file);
500 struct soc_camera_device *icd = dev_get_drvdata(vdev->parent);
501 struct soc_camera_link *icl = to_soc_camera_link(icd);
502 struct soc_camera_host *ici;
505 if (!to_soc_camera_control(icd))
506 /* No device driver attached */
509 ici = to_soc_camera_host(icd->parent);
511 if (!try_module_get(ici->ops->owner)) {
512 dev_err(icd->pdev, "Couldn't lock capture bus driver.\n");
518 /* Now we really have to activate the camera */
519 if (icd->use_count == 1) {
520 /* Restore parameters before the last close() per V4L2 API */
521 struct v4l2_format f = {
522 .type = V4L2_BUF_TYPE_VIDEO_CAPTURE,
524 .width = icd->user_width,
525 .height = icd->user_height,
527 .colorspace = icd->colorspace,
529 icd->current_fmt->host_fmt->fourcc,
533 /* The camera could have been already on, try to reset */
535 icl->reset(icd->pdev);
537 /* Don't mess with the host during probe */
538 mutex_lock(&ici->host_lock);
539 ret = ici->ops->add(icd);
540 mutex_unlock(&ici->host_lock);
542 dev_err(icd->pdev, "Couldn't activate the camera: %d\n", ret);
546 ret = soc_camera_power_on(icd, icl);
550 pm_runtime_enable(&icd->vdev->dev);
551 ret = pm_runtime_resume(&icd->vdev->dev);
552 if (ret < 0 && ret != -ENOSYS)
556 * Try to configure with default parameters. Notice: this is the
557 * very first open, so, we cannot race against other calls,
558 * apart from someone else calling open() simultaneously, but
559 * .video_lock is protecting us against it.
561 ret = soc_camera_set_fmt(icd, &f);
565 if (ici->ops->init_videobuf) {
566 ici->ops->init_videobuf(&icd->vb_vidq, icd);
568 ret = ici->ops->init_videobuf2(&icd->vb2_vidq, icd);
572 v4l2_ctrl_handler_setup(&icd->ctrl_handler);
575 file->private_data = icd;
576 dev_dbg(icd->pdev, "camera device open\n");
581 * First four errors are entered with the .video_lock held
586 pm_runtime_disable(&icd->vdev->dev);
588 soc_camera_power_off(icd, icl);
590 ici->ops->remove(icd);
593 module_put(ici->ops->owner);
598 static int soc_camera_close(struct file *file)
600 struct soc_camera_device *icd = file->private_data;
601 struct soc_camera_host *ici = to_soc_camera_host(icd->parent);
604 if (!icd->use_count) {
605 struct soc_camera_link *icl = to_soc_camera_link(icd);
607 pm_runtime_suspend(&icd->vdev->dev);
608 pm_runtime_disable(&icd->vdev->dev);
610 if (ici->ops->init_videobuf2)
611 vb2_queue_release(&icd->vb2_vidq);
612 ici->ops->remove(icd);
614 soc_camera_power_off(icd, icl);
617 if (icd->streamer == file)
618 icd->streamer = NULL;
620 module_put(ici->ops->owner);
622 dev_dbg(icd->pdev, "camera device close\n");
627 static ssize_t soc_camera_read(struct file *file, char __user *buf,
628 size_t count, loff_t *ppos)
630 struct soc_camera_device *icd = file->private_data;
633 dev_err(icd->pdev, "camera device read not implemented\n");
638 static int soc_camera_mmap(struct file *file, struct vm_area_struct *vma)
640 struct soc_camera_device *icd = file->private_data;
641 struct soc_camera_host *ici = to_soc_camera_host(icd->parent);
644 dev_dbg(icd->pdev, "mmap called, vma=0x%08lx\n", (unsigned long)vma);
646 if (icd->streamer != file)
649 if (ici->ops->init_videobuf)
650 err = videobuf_mmap_mapper(&icd->vb_vidq, vma);
652 err = vb2_mmap(&icd->vb2_vidq, vma);
654 dev_dbg(icd->pdev, "vma start=0x%08lx, size=%ld, ret=%d\n",
655 (unsigned long)vma->vm_start,
656 (unsigned long)vma->vm_end - (unsigned long)vma->vm_start,
662 static unsigned int soc_camera_poll(struct file *file, poll_table *pt)
664 struct soc_camera_device *icd = file->private_data;
665 struct soc_camera_host *ici = to_soc_camera_host(icd->parent);
667 if (icd->streamer != file)
670 if (ici->ops->init_videobuf && list_empty(&icd->vb_vidq.stream)) {
671 dev_err(icd->pdev, "Trying to poll with no queued buffers!\n");
675 return ici->ops->poll(file, pt);
678 void soc_camera_lock(struct vb2_queue *vq)
680 struct soc_camera_device *icd = vb2_get_drv_priv(vq);
681 mutex_lock(&icd->video_lock);
683 EXPORT_SYMBOL(soc_camera_lock);
685 void soc_camera_unlock(struct vb2_queue *vq)
687 struct soc_camera_device *icd = vb2_get_drv_priv(vq);
688 mutex_unlock(&icd->video_lock);
690 EXPORT_SYMBOL(soc_camera_unlock);
692 static struct v4l2_file_operations soc_camera_fops = {
693 .owner = THIS_MODULE,
694 .open = soc_camera_open,
695 .release = soc_camera_close,
696 .unlocked_ioctl = video_ioctl2,
697 .read = soc_camera_read,
698 .mmap = soc_camera_mmap,
699 .poll = soc_camera_poll,
702 static int soc_camera_s_fmt_vid_cap(struct file *file, void *priv,
703 struct v4l2_format *f)
705 struct soc_camera_device *icd = file->private_data;
708 WARN_ON(priv != file->private_data);
710 if (f->type != V4L2_BUF_TYPE_VIDEO_CAPTURE) {
711 dev_warn(icd->pdev, "Wrong buf-type %d\n", f->type);
715 if (icd->streamer && icd->streamer != file)
718 if (is_streaming(to_soc_camera_host(icd->parent), icd)) {
719 dev_err(icd->pdev, "S_FMT denied: queue initialised\n");
723 ret = soc_camera_set_fmt(icd, f);
725 if (!ret && !icd->streamer)
726 icd->streamer = file;
731 static int soc_camera_enum_fmt_vid_cap(struct file *file, void *priv,
732 struct v4l2_fmtdesc *f)
734 struct soc_camera_device *icd = file->private_data;
735 const struct soc_mbus_pixelfmt *format;
737 WARN_ON(priv != file->private_data);
739 if (f->index >= icd->num_user_formats)
742 format = icd->user_formats[f->index].host_fmt;
745 strlcpy(f->description, format->name, sizeof(f->description));
746 f->pixelformat = format->fourcc;
750 static int soc_camera_g_fmt_vid_cap(struct file *file, void *priv,
751 struct v4l2_format *f)
753 struct soc_camera_device *icd = file->private_data;
754 struct v4l2_pix_format *pix = &f->fmt.pix;
756 WARN_ON(priv != file->private_data);
758 if (f->type != V4L2_BUF_TYPE_VIDEO_CAPTURE)
761 pix->width = icd->user_width;
762 pix->height = icd->user_height;
763 pix->bytesperline = icd->bytesperline;
764 pix->sizeimage = icd->sizeimage;
765 pix->field = icd->field;
766 pix->pixelformat = icd->current_fmt->host_fmt->fourcc;
767 pix->colorspace = icd->colorspace;
768 dev_dbg(icd->pdev, "current_fmt->fourcc: 0x%08x\n",
769 icd->current_fmt->host_fmt->fourcc);
773 static int soc_camera_querycap(struct file *file, void *priv,
774 struct v4l2_capability *cap)
776 struct soc_camera_device *icd = file->private_data;
777 struct soc_camera_host *ici = to_soc_camera_host(icd->parent);
779 WARN_ON(priv != file->private_data);
781 strlcpy(cap->driver, ici->drv_name, sizeof(cap->driver));
782 return ici->ops->querycap(ici, cap);
785 static int soc_camera_streamon(struct file *file, void *priv,
786 enum v4l2_buf_type i)
788 struct soc_camera_device *icd = file->private_data;
789 struct soc_camera_host *ici = to_soc_camera_host(icd->parent);
790 struct v4l2_subdev *sd = soc_camera_to_subdev(icd);
793 WARN_ON(priv != file->private_data);
795 if (i != V4L2_BUF_TYPE_VIDEO_CAPTURE)
798 if (icd->streamer != file)
801 /* This calls buf_queue from host driver's videobuf_queue_ops */
802 if (ici->ops->init_videobuf)
803 ret = videobuf_streamon(&icd->vb_vidq);
805 ret = vb2_streamon(&icd->vb2_vidq, i);
808 v4l2_subdev_call(sd, video, s_stream, 1);
813 static int soc_camera_streamoff(struct file *file, void *priv,
814 enum v4l2_buf_type i)
816 struct soc_camera_device *icd = file->private_data;
817 struct v4l2_subdev *sd = soc_camera_to_subdev(icd);
818 struct soc_camera_host *ici = to_soc_camera_host(icd->parent);
820 WARN_ON(priv != file->private_data);
822 if (i != V4L2_BUF_TYPE_VIDEO_CAPTURE)
825 if (icd->streamer != file)
829 * This calls buf_release from host driver's videobuf_queue_ops for all
830 * remaining buffers. When the last buffer is freed, stop capture
832 if (ici->ops->init_videobuf)
833 videobuf_streamoff(&icd->vb_vidq);
835 vb2_streamoff(&icd->vb2_vidq, i);
837 v4l2_subdev_call(sd, video, s_stream, 0);
842 static int soc_camera_cropcap(struct file *file, void *fh,
843 struct v4l2_cropcap *a)
845 struct soc_camera_device *icd = file->private_data;
846 struct soc_camera_host *ici = to_soc_camera_host(icd->parent);
848 return ici->ops->cropcap(icd, a);
851 static int soc_camera_g_crop(struct file *file, void *fh,
854 struct soc_camera_device *icd = file->private_data;
855 struct soc_camera_host *ici = to_soc_camera_host(icd->parent);
858 ret = ici->ops->get_crop(icd, a);
864 * According to the V4L2 API, drivers shall not update the struct v4l2_crop
865 * argument with the actual geometry, instead, the user shall use G_CROP to
868 static int soc_camera_s_crop(struct file *file, void *fh,
871 struct soc_camera_device *icd = file->private_data;
872 struct soc_camera_host *ici = to_soc_camera_host(icd->parent);
873 struct v4l2_rect *rect = &a->c;
874 struct v4l2_crop current_crop;
877 if (a->type != V4L2_BUF_TYPE_VIDEO_CAPTURE)
880 dev_dbg(icd->pdev, "S_CROP(%ux%u@%u:%u)\n",
881 rect->width, rect->height, rect->left, rect->top);
883 /* If get_crop fails, we'll let host and / or client drivers decide */
884 ret = ici->ops->get_crop(icd, ¤t_crop);
886 /* Prohibit window size change with initialised buffers */
889 "S_CROP denied: getting current crop failed\n");
890 } else if ((a->c.width == current_crop.c.width &&
891 a->c.height == current_crop.c.height) ||
892 !is_streaming(ici, icd)) {
893 /* same size or not streaming - use .set_crop() */
894 ret = ici->ops->set_crop(icd, a);
895 } else if (ici->ops->set_livecrop) {
896 ret = ici->ops->set_livecrop(icd, a);
899 "S_CROP denied: queue initialised and sizes differ\n");
906 static int soc_camera_g_parm(struct file *file, void *fh,
907 struct v4l2_streamparm *a)
909 struct soc_camera_device *icd = file->private_data;
910 struct soc_camera_host *ici = to_soc_camera_host(icd->parent);
912 if (ici->ops->get_parm)
913 return ici->ops->get_parm(icd, a);
918 static int soc_camera_s_parm(struct file *file, void *fh,
919 struct v4l2_streamparm *a)
921 struct soc_camera_device *icd = file->private_data;
922 struct soc_camera_host *ici = to_soc_camera_host(icd->parent);
924 if (ici->ops->set_parm)
925 return ici->ops->set_parm(icd, a);
930 static int soc_camera_g_chip_ident(struct file *file, void *fh,
931 struct v4l2_dbg_chip_ident *id)
933 struct soc_camera_device *icd = file->private_data;
934 struct v4l2_subdev *sd = soc_camera_to_subdev(icd);
936 return v4l2_subdev_call(sd, core, g_chip_ident, id);
939 #ifdef CONFIG_VIDEO_ADV_DEBUG
940 static int soc_camera_g_register(struct file *file, void *fh,
941 struct v4l2_dbg_register *reg)
943 struct soc_camera_device *icd = file->private_data;
944 struct v4l2_subdev *sd = soc_camera_to_subdev(icd);
946 return v4l2_subdev_call(sd, core, g_register, reg);
949 static int soc_camera_s_register(struct file *file, void *fh,
950 struct v4l2_dbg_register *reg)
952 struct soc_camera_device *icd = file->private_data;
953 struct v4l2_subdev *sd = soc_camera_to_subdev(icd);
955 return v4l2_subdev_call(sd, core, s_register, reg);
959 static int soc_camera_probe(struct soc_camera_device *icd);
961 /* So far this function cannot fail */
962 static void scan_add_host(struct soc_camera_host *ici)
964 struct soc_camera_device *icd;
966 mutex_lock(&ici->host_lock);
968 list_for_each_entry(icd, &devices, list) {
969 if (icd->iface == ici->nr) {
972 icd->parent = ici->v4l2_dev.dev;
973 ret = soc_camera_probe(icd);
977 mutex_unlock(&ici->host_lock);
980 #ifdef CONFIG_I2C_BOARDINFO
981 static int soc_camera_init_i2c(struct soc_camera_device *icd,
982 struct soc_camera_link *icl)
984 struct i2c_client *client;
985 struct soc_camera_host *ici = to_soc_camera_host(icd->parent);
986 struct i2c_adapter *adap = i2c_get_adapter(icl->i2c_adapter_id);
987 struct v4l2_subdev *subdev;
990 dev_err(icd->pdev, "Cannot get I2C adapter #%d. No driver?\n",
991 icl->i2c_adapter_id);
995 icl->board_info->platform_data = icl;
997 subdev = v4l2_i2c_new_subdev_board(&ici->v4l2_dev, adap,
998 icl->board_info, NULL);
1002 client = v4l2_get_subdevdata(subdev);
1004 /* Use to_i2c_client(dev) to recover the i2c client */
1005 icd->control = &client->dev;
1009 i2c_put_adapter(adap);
1014 static void soc_camera_free_i2c(struct soc_camera_device *icd)
1016 struct i2c_client *client =
1017 to_i2c_client(to_soc_camera_control(icd));
1018 struct i2c_adapter *adap = client->adapter;
1020 icd->control = NULL;
1021 v4l2_device_unregister_subdev(i2c_get_clientdata(client));
1022 i2c_unregister_device(client);
1023 i2c_put_adapter(adap);
1026 #define soc_camera_init_i2c(icd, icl) (-ENODEV)
1027 #define soc_camera_free_i2c(icd) do {} while (0)
1030 static int soc_camera_video_start(struct soc_camera_device *icd);
1031 static int video_dev_create(struct soc_camera_device *icd);
1032 /* Called during host-driver probe */
1033 static int soc_camera_probe(struct soc_camera_device *icd)
1035 struct soc_camera_host *ici = to_soc_camera_host(icd->parent);
1036 struct soc_camera_link *icl = to_soc_camera_link(icd);
1037 struct device *control = NULL;
1038 struct v4l2_subdev *sd;
1039 struct v4l2_mbus_framefmt mf;
1042 dev_info(icd->pdev, "Probing %s\n", dev_name(icd->pdev));
1045 * Currently the subdev with the largest number of controls (13) is
1046 * ov6550. So let's pick 16 as a hint for the control handler. Note
1047 * that this is a hint only: too large and you waste some memory, too
1048 * small and there is a (very) small performance hit when looking up
1049 * controls in the internal hash.
1051 ret = v4l2_ctrl_handler_init(&icd->ctrl_handler, 16);
1055 ret = regulator_bulk_get(icd->pdev, icl->num_regulators,
1060 /* The camera could have been already on, try to reset */
1062 icl->reset(icd->pdev);
1064 ret = ici->ops->add(icd);
1069 * This will not yet call v4l2_subdev_core_ops::s_power(1), because the
1070 * subdevice has not been initialised yet. We'll have to call it once
1071 * again after initialisation, even though it shouldn't be needed, we
1072 * don't do any IO here.
1074 ret = soc_camera_power_on(icd, icl);
1078 /* Must have icd->vdev before registering the device */
1079 ret = video_dev_create(icd);
1083 /* Non-i2c cameras, e.g., soc_camera_platform, have no board_info */
1084 if (icl->board_info) {
1085 ret = soc_camera_init_i2c(icd, icl);
1088 } else if (!icl->add_device || !icl->del_device) {
1092 if (icl->module_name)
1093 ret = request_module(icl->module_name);
1095 ret = icl->add_device(icd);
1100 * FIXME: this is racy, have to use driver-binding notification,
1101 * when it is available
1103 control = to_soc_camera_control(icd);
1104 if (!control || !control->driver || !dev_get_drvdata(control) ||
1105 !try_module_get(control->driver->owner)) {
1106 icl->del_device(icd);
1112 sd = soc_camera_to_subdev(icd);
1113 sd->grp_id = soc_camera_grp_id(icd);
1114 v4l2_set_subdev_hostdata(sd, icd);
1116 if (v4l2_ctrl_add_handler(&icd->ctrl_handler, sd->ctrl_handler))
1119 /* At this point client .probe() should have run already */
1120 ret = soc_camera_init_user_formats(icd);
1124 icd->field = V4L2_FIELD_ANY;
1127 * ..._video_start() will create a device node, video_register_device()
1128 * itself is protected against concurrent open() calls, but we also have
1129 * to protect our data.
1131 mutex_lock(&icd->video_lock);
1133 ret = soc_camera_video_start(icd);
1137 ret = v4l2_subdev_call(sd, core, s_power, 1);
1138 if (ret < 0 && ret != -ENOIOCTLCMD)
1141 /* Try to improve our guess of a reasonable window format */
1142 if (!v4l2_subdev_call(sd, video, g_mbus_fmt, &mf)) {
1143 icd->user_width = mf.width;
1144 icd->user_height = mf.height;
1145 icd->colorspace = mf.colorspace;
1146 icd->field = mf.field;
1149 ici->ops->remove(icd);
1151 soc_camera_power_off(icd, icl);
1153 mutex_unlock(&icd->video_lock);
1158 video_unregister_device(icd->vdev);
1160 mutex_unlock(&icd->video_lock);
1161 soc_camera_free_user_formats(icd);
1164 if (icl->board_info) {
1165 soc_camera_free_i2c(icd);
1167 icl->del_device(icd);
1168 module_put(control->driver->owner);
1172 video_device_release(icd->vdev);
1175 soc_camera_power_off(icd, icl);
1177 ici->ops->remove(icd);
1179 regulator_bulk_free(icl->num_regulators, icl->regulators);
1181 v4l2_ctrl_handler_free(&icd->ctrl_handler);
1186 * This is called on device_unregister, which only means we have to disconnect
1187 * from the host, but not remove ourselves from the device list
1189 static int soc_camera_remove(struct soc_camera_device *icd)
1191 struct soc_camera_link *icl = to_soc_camera_link(icd);
1192 struct video_device *vdev = icd->vdev;
1194 BUG_ON(!icd->parent);
1196 v4l2_ctrl_handler_free(&icd->ctrl_handler);
1198 video_unregister_device(vdev);
1202 if (icl->board_info) {
1203 soc_camera_free_i2c(icd);
1205 struct device_driver *drv = to_soc_camera_control(icd)->driver;
1207 icl->del_device(icd);
1208 module_put(drv->owner);
1211 soc_camera_free_user_formats(icd);
1213 regulator_bulk_free(icl->num_regulators, icl->regulators);
1218 static int default_cropcap(struct soc_camera_device *icd,
1219 struct v4l2_cropcap *a)
1221 struct v4l2_subdev *sd = soc_camera_to_subdev(icd);
1222 return v4l2_subdev_call(sd, video, cropcap, a);
1225 static int default_g_crop(struct soc_camera_device *icd, struct v4l2_crop *a)
1227 struct v4l2_subdev *sd = soc_camera_to_subdev(icd);
1228 return v4l2_subdev_call(sd, video, g_crop, a);
1231 static int default_s_crop(struct soc_camera_device *icd, struct v4l2_crop *a)
1233 struct v4l2_subdev *sd = soc_camera_to_subdev(icd);
1234 return v4l2_subdev_call(sd, video, s_crop, a);
1237 static int default_g_parm(struct soc_camera_device *icd,
1238 struct v4l2_streamparm *parm)
1240 struct v4l2_subdev *sd = soc_camera_to_subdev(icd);
1241 return v4l2_subdev_call(sd, video, g_parm, parm);
1244 static int default_s_parm(struct soc_camera_device *icd,
1245 struct v4l2_streamparm *parm)
1247 struct v4l2_subdev *sd = soc_camera_to_subdev(icd);
1248 return v4l2_subdev_call(sd, video, s_parm, parm);
1251 static int default_enum_framesizes(struct soc_camera_device *icd,
1252 struct v4l2_frmsizeenum *fsize)
1255 struct v4l2_subdev *sd = soc_camera_to_subdev(icd);
1256 const struct soc_camera_format_xlate *xlate;
1257 __u32 pixfmt = fsize->pixel_format;
1258 struct v4l2_frmsizeenum fsize_mbus = *fsize;
1260 xlate = soc_camera_xlate_by_fourcc(icd, pixfmt);
1263 /* map xlate-code to pixel_format, sensor only handle xlate-code*/
1264 fsize_mbus.pixel_format = xlate->code;
1266 ret = v4l2_subdev_call(sd, video, enum_framesizes, &fsize_mbus);
1270 *fsize = fsize_mbus;
1271 fsize->pixel_format = pixfmt;
1276 int soc_camera_host_register(struct soc_camera_host *ici)
1278 struct soc_camera_host *ix;
1281 if (!ici || !ici->ops ||
1282 !ici->ops->try_fmt ||
1283 !ici->ops->set_fmt ||
1284 !ici->ops->set_bus_param ||
1285 !ici->ops->querycap ||
1286 ((!ici->ops->init_videobuf ||
1287 !ici->ops->reqbufs) &&
1288 !ici->ops->init_videobuf2) ||
1290 !ici->ops->remove ||
1295 if (!ici->ops->set_crop)
1296 ici->ops->set_crop = default_s_crop;
1297 if (!ici->ops->get_crop)
1298 ici->ops->get_crop = default_g_crop;
1299 if (!ici->ops->cropcap)
1300 ici->ops->cropcap = default_cropcap;
1301 if (!ici->ops->set_parm)
1302 ici->ops->set_parm = default_s_parm;
1303 if (!ici->ops->get_parm)
1304 ici->ops->get_parm = default_g_parm;
1305 if (!ici->ops->enum_framesizes)
1306 ici->ops->enum_framesizes = default_enum_framesizes;
1308 mutex_lock(&list_lock);
1309 list_for_each_entry(ix, &hosts, list) {
1310 if (ix->nr == ici->nr) {
1316 ret = v4l2_device_register(ici->v4l2_dev.dev, &ici->v4l2_dev);
1320 list_add_tail(&ici->list, &hosts);
1321 mutex_unlock(&list_lock);
1323 mutex_init(&ici->host_lock);
1329 mutex_unlock(&list_lock);
1332 EXPORT_SYMBOL(soc_camera_host_register);
1334 /* Unregister all clients! */
1335 void soc_camera_host_unregister(struct soc_camera_host *ici)
1337 struct soc_camera_device *icd;
1339 mutex_lock(&list_lock);
1341 list_del(&ici->list);
1342 list_for_each_entry(icd, &devices, list)
1343 if (icd->iface == ici->nr && to_soc_camera_control(icd))
1344 soc_camera_remove(icd);
1346 mutex_unlock(&list_lock);
1348 v4l2_device_unregister(&ici->v4l2_dev);
1350 EXPORT_SYMBOL(soc_camera_host_unregister);
1352 /* Image capture device */
1353 static int soc_camera_device_register(struct soc_camera_device *icd)
1355 struct soc_camera_device *ix;
1358 for (i = 0; i < 256 && num < 0; i++) {
1360 /* Check if this index is available on this interface */
1361 list_for_each_entry(ix, &devices, list) {
1362 if (ix->iface == icd->iface && ix->devnum == i) {
1371 * ok, we have 256 cameras on this host...
1372 * man, stay reasonable...
1378 icd->host_priv = NULL;
1379 mutex_init(&icd->video_lock);
1381 list_add_tail(&icd->list, &devices);
1386 static const struct v4l2_ioctl_ops soc_camera_ioctl_ops = {
1387 .vidioc_querycap = soc_camera_querycap,
1388 .vidioc_try_fmt_vid_cap = soc_camera_try_fmt_vid_cap,
1389 .vidioc_g_fmt_vid_cap = soc_camera_g_fmt_vid_cap,
1390 .vidioc_s_fmt_vid_cap = soc_camera_s_fmt_vid_cap,
1391 .vidioc_enum_fmt_vid_cap = soc_camera_enum_fmt_vid_cap,
1392 .vidioc_enum_input = soc_camera_enum_input,
1393 .vidioc_g_input = soc_camera_g_input,
1394 .vidioc_s_input = soc_camera_s_input,
1395 .vidioc_s_std = soc_camera_s_std,
1396 .vidioc_g_std = soc_camera_g_std,
1397 .vidioc_enum_framesizes = soc_camera_enum_framesizes,
1398 .vidioc_reqbufs = soc_camera_reqbufs,
1399 .vidioc_querybuf = soc_camera_querybuf,
1400 .vidioc_qbuf = soc_camera_qbuf,
1401 .vidioc_dqbuf = soc_camera_dqbuf,
1402 .vidioc_create_bufs = soc_camera_create_bufs,
1403 .vidioc_prepare_buf = soc_camera_prepare_buf,
1404 .vidioc_streamon = soc_camera_streamon,
1405 .vidioc_streamoff = soc_camera_streamoff,
1406 .vidioc_cropcap = soc_camera_cropcap,
1407 .vidioc_g_crop = soc_camera_g_crop,
1408 .vidioc_s_crop = soc_camera_s_crop,
1409 .vidioc_g_parm = soc_camera_g_parm,
1410 .vidioc_s_parm = soc_camera_s_parm,
1411 .vidioc_g_chip_ident = soc_camera_g_chip_ident,
1412 #ifdef CONFIG_VIDEO_ADV_DEBUG
1413 .vidioc_g_register = soc_camera_g_register,
1414 .vidioc_s_register = soc_camera_s_register,
1418 static int video_dev_create(struct soc_camera_device *icd)
1420 struct soc_camera_host *ici = to_soc_camera_host(icd->parent);
1421 struct video_device *vdev = video_device_alloc();
1426 strlcpy(vdev->name, ici->drv_name, sizeof(vdev->name));
1428 vdev->parent = icd->pdev;
1429 vdev->current_norm = V4L2_STD_UNKNOWN;
1430 vdev->fops = &soc_camera_fops;
1431 vdev->ioctl_ops = &soc_camera_ioctl_ops;
1432 vdev->release = video_device_release;
1433 vdev->tvnorms = V4L2_STD_UNKNOWN;
1434 vdev->ctrl_handler = &icd->ctrl_handler;
1435 vdev->lock = &icd->video_lock;
1436 /* Locking in file operations other than ioctl should be done
1437 by the driver, not the V4L2 core.
1438 This driver needs auditing so that this flag can be removed. */
1439 set_bit(V4L2_FL_LOCK_ALL_FOPS, &vdev->flags);
1447 * Called from soc_camera_probe() above (with .video_lock held???)
1449 static int soc_camera_video_start(struct soc_camera_device *icd)
1451 const struct device_type *type = icd->vdev->dev.type;
1457 ret = video_register_device(icd->vdev, VFL_TYPE_GRABBER, -1);
1459 dev_err(icd->pdev, "video_register_device failed: %d\n", ret);
1463 /* Restore device type, possibly set by the subdevice driver */
1464 icd->vdev->dev.type = type;
1469 static int __devinit soc_camera_pdrv_probe(struct platform_device *pdev)
1471 struct soc_camera_link *icl = pdev->dev.platform_data;
1472 struct soc_camera_device *icd;
1478 icd = kzalloc(sizeof(*icd), GFP_KERNEL);
1482 icd->iface = icl->bus_id;
1484 icd->pdev = &pdev->dev;
1485 platform_set_drvdata(pdev, icd);
1487 ret = soc_camera_device_register(icd);
1491 icd->user_width = DEFAULT_WIDTH;
1492 icd->user_height = DEFAULT_HEIGHT;
1503 * Only called on rmmod for each platform device, since they are not
1504 * hot-pluggable. Now we know, that all our users - hosts and devices have
1505 * been unloaded already
1507 static int __devexit soc_camera_pdrv_remove(struct platform_device *pdev)
1509 struct soc_camera_device *icd = platform_get_drvdata(pdev);
1514 list_del(&icd->list);
1521 static struct platform_driver __refdata soc_camera_pdrv = {
1522 .probe = soc_camera_pdrv_probe,
1523 .remove = __devexit_p(soc_camera_pdrv_remove),
1525 .name = "soc-camera-pdrv",
1526 .owner = THIS_MODULE,
1530 static int __init soc_camera_init(void)
1532 return platform_driver_register(&soc_camera_pdrv);
1535 static void __exit soc_camera_exit(void)
1537 platform_driver_unregister(&soc_camera_pdrv);
1540 module_init(soc_camera_init);
1541 module_exit(soc_camera_exit);
1543 MODULE_DESCRIPTION("Image capture bus driver");
1544 MODULE_AUTHOR("Guennadi Liakhovetski <kernel@pengutronix.de>");
1545 MODULE_LICENSE("GPL");
1546 MODULE_ALIAS("platform:soc-camera-pdrv");