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 int soc_camera_power_on(struct device *dev, struct soc_camera_subdev_desc *ssdd)
55 int ret = regulator_bulk_enable(ssdd->num_regulators,
58 dev_err(dev, "Cannot enable regulators\n");
63 ret = ssdd->power(dev, 1);
66 "Platform failed to power-on the camera.\n");
67 regulator_bulk_disable(ssdd->num_regulators,
74 EXPORT_SYMBOL(soc_camera_power_on);
76 int soc_camera_power_off(struct device *dev, struct soc_camera_subdev_desc *ssdd)
82 err = ssdd->power(dev, 0);
85 "Platform failed to power-off the camera.\n");
90 err = regulator_bulk_disable(ssdd->num_regulators,
93 dev_err(dev, "Cannot disable regulators\n");
99 EXPORT_SYMBOL(soc_camera_power_off);
101 static int __soc_camera_power_on(struct soc_camera_device *icd)
103 struct v4l2_subdev *sd = soc_camera_to_subdev(icd);
106 ret = v4l2_subdev_call(sd, core, s_power, 1);
107 if (ret < 0 && ret != -ENOIOCTLCMD && ret != -ENODEV)
113 static int __soc_camera_power_off(struct soc_camera_device *icd)
115 struct v4l2_subdev *sd = soc_camera_to_subdev(icd);
118 ret = v4l2_subdev_call(sd, core, s_power, 0);
119 if (ret < 0 && ret != -ENOIOCTLCMD && ret != -ENODEV)
125 const struct soc_camera_format_xlate *soc_camera_xlate_by_fourcc(
126 struct soc_camera_device *icd, unsigned int fourcc)
130 for (i = 0; i < icd->num_user_formats; i++)
131 if (icd->user_formats[i].host_fmt->fourcc == fourcc)
132 return icd->user_formats + i;
135 EXPORT_SYMBOL(soc_camera_xlate_by_fourcc);
138 * soc_camera_apply_board_flags() - apply platform SOCAM_SENSOR_INVERT_* flags
139 * @ssdd: camera platform parameters
140 * @cfg: media bus configuration
141 * @return: resulting flags
143 unsigned long soc_camera_apply_board_flags(struct soc_camera_subdev_desc *ssdd,
144 const struct v4l2_mbus_config *cfg)
146 unsigned long f, flags = cfg->flags;
148 /* If only one of the two polarities is supported, switch to the opposite */
149 if (ssdd->flags & SOCAM_SENSOR_INVERT_HSYNC) {
150 f = flags & (V4L2_MBUS_HSYNC_ACTIVE_HIGH | V4L2_MBUS_HSYNC_ACTIVE_LOW);
151 if (f == V4L2_MBUS_HSYNC_ACTIVE_HIGH || f == V4L2_MBUS_HSYNC_ACTIVE_LOW)
152 flags ^= V4L2_MBUS_HSYNC_ACTIVE_HIGH | V4L2_MBUS_HSYNC_ACTIVE_LOW;
155 if (ssdd->flags & SOCAM_SENSOR_INVERT_VSYNC) {
156 f = flags & (V4L2_MBUS_VSYNC_ACTIVE_HIGH | V4L2_MBUS_VSYNC_ACTIVE_LOW);
157 if (f == V4L2_MBUS_VSYNC_ACTIVE_HIGH || f == V4L2_MBUS_VSYNC_ACTIVE_LOW)
158 flags ^= V4L2_MBUS_VSYNC_ACTIVE_HIGH | V4L2_MBUS_VSYNC_ACTIVE_LOW;
161 if (ssdd->flags & SOCAM_SENSOR_INVERT_PCLK) {
162 f = flags & (V4L2_MBUS_PCLK_SAMPLE_RISING | V4L2_MBUS_PCLK_SAMPLE_FALLING);
163 if (f == V4L2_MBUS_PCLK_SAMPLE_RISING || f == V4L2_MBUS_PCLK_SAMPLE_FALLING)
164 flags ^= V4L2_MBUS_PCLK_SAMPLE_RISING | V4L2_MBUS_PCLK_SAMPLE_FALLING;
169 EXPORT_SYMBOL(soc_camera_apply_board_flags);
171 #define pixfmtstr(x) (x) & 0xff, ((x) >> 8) & 0xff, ((x) >> 16) & 0xff, \
174 static int soc_camera_try_fmt(struct soc_camera_device *icd,
175 struct v4l2_format *f)
177 struct soc_camera_host *ici = to_soc_camera_host(icd->parent);
178 const struct soc_camera_format_xlate *xlate;
179 struct v4l2_pix_format *pix = &f->fmt.pix;
182 dev_dbg(icd->pdev, "TRY_FMT(%c%c%c%c, %ux%u)\n",
183 pixfmtstr(pix->pixelformat), pix->width, pix->height);
185 if (pix->pixelformat != V4L2_PIX_FMT_JPEG &&
186 !(ici->capabilities & SOCAM_HOST_CAP_STRIDE)) {
187 pix->bytesperline = 0;
191 ret = ici->ops->try_fmt(icd, f);
195 xlate = soc_camera_xlate_by_fourcc(icd, pix->pixelformat);
199 ret = soc_mbus_bytes_per_line(pix->width, xlate->host_fmt);
203 pix->bytesperline = max_t(u32, pix->bytesperline, ret);
205 ret = soc_mbus_image_size(xlate->host_fmt, pix->bytesperline,
210 pix->sizeimage = max_t(u32, pix->sizeimage, ret);
215 static int soc_camera_try_fmt_vid_cap(struct file *file, void *priv,
216 struct v4l2_format *f)
218 struct soc_camera_device *icd = file->private_data;
220 WARN_ON(priv != file->private_data);
222 /* Only single-plane capture is supported so far */
223 if (f->type != V4L2_BUF_TYPE_VIDEO_CAPTURE)
226 /* limit format to hardware capabilities */
227 return soc_camera_try_fmt(icd, f);
230 static int soc_camera_enum_input(struct file *file, void *priv,
231 struct v4l2_input *inp)
236 /* default is camera */
237 inp->type = V4L2_INPUT_TYPE_CAMERA;
238 inp->std = V4L2_STD_UNKNOWN;
239 strcpy(inp->name, "Camera");
244 static int soc_camera_g_input(struct file *file, void *priv, unsigned int *i)
251 static int soc_camera_s_input(struct file *file, void *priv, unsigned int i)
259 static int soc_camera_s_std(struct file *file, void *priv, v4l2_std_id a)
261 struct soc_camera_device *icd = file->private_data;
262 struct v4l2_subdev *sd = soc_camera_to_subdev(icd);
264 return v4l2_subdev_call(sd, core, s_std, a);
267 static int soc_camera_g_std(struct file *file, void *priv, v4l2_std_id *a)
269 struct soc_camera_device *icd = file->private_data;
270 struct v4l2_subdev *sd = soc_camera_to_subdev(icd);
272 return v4l2_subdev_call(sd, core, g_std, a);
275 static int soc_camera_enum_framesizes(struct file *file, void *fh,
276 struct v4l2_frmsizeenum *fsize)
278 struct soc_camera_device *icd = file->private_data;
279 struct soc_camera_host *ici = to_soc_camera_host(icd->parent);
281 return ici->ops->enum_framesizes(icd, fsize);
284 static int soc_camera_reqbufs(struct file *file, void *priv,
285 struct v4l2_requestbuffers *p)
288 struct soc_camera_device *icd = file->private_data;
289 struct soc_camera_host *ici = to_soc_camera_host(icd->parent);
291 WARN_ON(priv != file->private_data);
293 if (icd->streamer && icd->streamer != file)
296 if (ici->ops->init_videobuf) {
297 ret = videobuf_reqbufs(&icd->vb_vidq, p);
301 ret = ici->ops->reqbufs(icd, p);
303 ret = vb2_reqbufs(&icd->vb2_vidq, p);
306 if (!ret && !icd->streamer)
307 icd->streamer = file;
312 static int soc_camera_querybuf(struct file *file, void *priv,
313 struct v4l2_buffer *p)
315 struct soc_camera_device *icd = file->private_data;
316 struct soc_camera_host *ici = to_soc_camera_host(icd->parent);
318 WARN_ON(priv != file->private_data);
320 if (ici->ops->init_videobuf)
321 return videobuf_querybuf(&icd->vb_vidq, p);
323 return vb2_querybuf(&icd->vb2_vidq, p);
326 static int soc_camera_qbuf(struct file *file, void *priv,
327 struct v4l2_buffer *p)
329 struct soc_camera_device *icd = file->private_data;
330 struct soc_camera_host *ici = to_soc_camera_host(icd->parent);
332 WARN_ON(priv != file->private_data);
334 if (icd->streamer != file)
337 if (ici->ops->init_videobuf)
338 return videobuf_qbuf(&icd->vb_vidq, p);
340 return vb2_qbuf(&icd->vb2_vidq, p);
343 static int soc_camera_dqbuf(struct file *file, void *priv,
344 struct v4l2_buffer *p)
346 struct soc_camera_device *icd = file->private_data;
347 struct soc_camera_host *ici = to_soc_camera_host(icd->parent);
349 WARN_ON(priv != file->private_data);
351 if (icd->streamer != file)
354 if (ici->ops->init_videobuf)
355 return videobuf_dqbuf(&icd->vb_vidq, p, file->f_flags & O_NONBLOCK);
357 return vb2_dqbuf(&icd->vb2_vidq, p, file->f_flags & O_NONBLOCK);
360 static int soc_camera_create_bufs(struct file *file, void *priv,
361 struct v4l2_create_buffers *create)
363 struct soc_camera_device *icd = file->private_data;
364 struct soc_camera_host *ici = to_soc_camera_host(icd->parent);
367 if (ici->ops->init_videobuf)
370 return vb2_create_bufs(&icd->vb2_vidq, create);
373 static int soc_camera_prepare_buf(struct file *file, void *priv,
374 struct v4l2_buffer *b)
376 struct soc_camera_device *icd = file->private_data;
377 struct soc_camera_host *ici = to_soc_camera_host(icd->parent);
380 if (ici->ops->init_videobuf)
383 return vb2_prepare_buf(&icd->vb2_vidq, b);
386 /* Always entered with .host_lock held */
387 static int soc_camera_init_user_formats(struct soc_camera_device *icd)
389 struct v4l2_subdev *sd = soc_camera_to_subdev(icd);
390 struct soc_camera_host *ici = to_soc_camera_host(icd->parent);
391 unsigned int i, fmts = 0, raw_fmts = 0;
393 enum v4l2_mbus_pixelcode code;
395 while (!v4l2_subdev_call(sd, video, enum_mbus_fmt, raw_fmts, &code))
398 if (!ici->ops->get_formats)
400 * Fallback mode - the host will have to serve all
401 * sensor-provided formats one-to-one to the user
406 * First pass - only count formats this host-sensor
407 * configuration can provide
409 for (i = 0; i < raw_fmts; i++) {
410 ret = ici->ops->get_formats(icd, i, NULL);
420 vmalloc(fmts * sizeof(struct soc_camera_format_xlate));
421 if (!icd->user_formats)
424 dev_dbg(icd->pdev, "Found %d supported formats.\n", fmts);
426 /* Second pass - actually fill data formats */
428 for (i = 0; i < raw_fmts; i++)
429 if (!ici->ops->get_formats) {
430 v4l2_subdev_call(sd, video, enum_mbus_fmt, i, &code);
431 icd->user_formats[fmts].host_fmt =
432 soc_mbus_get_fmtdesc(code);
433 if (icd->user_formats[fmts].host_fmt)
434 icd->user_formats[fmts++].code = code;
436 ret = ici->ops->get_formats(icd, i,
437 &icd->user_formats[fmts]);
443 icd->num_user_formats = fmts;
444 icd->current_fmt = &icd->user_formats[0];
449 vfree(icd->user_formats);
453 /* Always entered with .host_lock held */
454 static void soc_camera_free_user_formats(struct soc_camera_device *icd)
456 struct soc_camera_host *ici = to_soc_camera_host(icd->parent);
458 if (ici->ops->put_formats)
459 ici->ops->put_formats(icd);
460 icd->current_fmt = NULL;
461 icd->num_user_formats = 0;
462 vfree(icd->user_formats);
463 icd->user_formats = NULL;
466 /* Called with .vb_lock held, or from the first open(2), see comment there */
467 static int soc_camera_set_fmt(struct soc_camera_device *icd,
468 struct v4l2_format *f)
470 struct soc_camera_host *ici = to_soc_camera_host(icd->parent);
471 struct v4l2_pix_format *pix = &f->fmt.pix;
474 dev_dbg(icd->pdev, "S_FMT(%c%c%c%c, %ux%u)\n",
475 pixfmtstr(pix->pixelformat), pix->width, pix->height);
477 /* We always call try_fmt() before set_fmt() or set_crop() */
478 ret = soc_camera_try_fmt(icd, f);
482 ret = ici->ops->set_fmt(icd, f);
485 } else if (!icd->current_fmt ||
486 icd->current_fmt->host_fmt->fourcc != pix->pixelformat) {
488 "Host driver hasn't set up current format correctly!\n");
492 icd->user_width = pix->width;
493 icd->user_height = pix->height;
494 icd->bytesperline = pix->bytesperline;
495 icd->sizeimage = pix->sizeimage;
496 icd->colorspace = pix->colorspace;
497 icd->field = pix->field;
498 if (ici->ops->init_videobuf)
499 icd->vb_vidq.field = pix->field;
501 dev_dbg(icd->pdev, "set width: %d height: %d\n",
502 icd->user_width, icd->user_height);
504 /* set physical bus parameters */
505 return ici->ops->set_bus_param(icd);
508 static int soc_camera_open(struct file *file)
510 struct video_device *vdev = video_devdata(file);
511 struct soc_camera_device *icd;
512 struct soc_camera_host *ici;
516 * Don't mess with the host during probe: wait until the loop in
517 * scan_add_host() completes. Also protect against a race with
518 * soc_camera_host_unregister().
520 if (mutex_lock_interruptible(&list_lock))
523 if (!vdev || !video_is_registered(vdev)) {
524 mutex_unlock(&list_lock);
528 icd = dev_get_drvdata(vdev->parent);
529 ici = to_soc_camera_host(icd->parent);
531 ret = try_module_get(ici->ops->owner) ? 0 : -ENODEV;
532 mutex_unlock(&list_lock);
535 dev_err(icd->pdev, "Couldn't lock capture bus driver.\n");
539 if (!to_soc_camera_control(icd)) {
540 /* No device driver attached */
545 if (mutex_lock_interruptible(&ici->host_lock)) {
551 /* Now we really have to activate the camera */
552 if (icd->use_count == 1) {
553 struct soc_camera_desc *sdesc = to_soc_camera_desc(icd);
554 /* Restore parameters before the last close() per V4L2 API */
555 struct v4l2_format f = {
556 .type = V4L2_BUF_TYPE_VIDEO_CAPTURE,
558 .width = icd->user_width,
559 .height = icd->user_height,
561 .colorspace = icd->colorspace,
563 icd->current_fmt->host_fmt->fourcc,
567 /* The camera could have been already on, try to reset */
568 if (sdesc->subdev_desc.reset)
569 sdesc->subdev_desc.reset(icd->pdev);
571 ret = ici->ops->add(icd);
573 dev_err(icd->pdev, "Couldn't activate the camera: %d\n", ret);
577 ret = __soc_camera_power_on(icd);
581 pm_runtime_enable(&icd->vdev->dev);
582 ret = pm_runtime_resume(&icd->vdev->dev);
583 if (ret < 0 && ret != -ENOSYS)
587 * Try to configure with default parameters. Notice: this is the
588 * very first open, so, we cannot race against other calls,
589 * apart from someone else calling open() simultaneously, but
590 * .host_lock is protecting us against it.
592 ret = soc_camera_set_fmt(icd, &f);
596 if (ici->ops->init_videobuf) {
597 ici->ops->init_videobuf(&icd->vb_vidq, icd);
599 ret = ici->ops->init_videobuf2(&icd->vb2_vidq, icd);
603 v4l2_ctrl_handler_setup(&icd->ctrl_handler);
605 mutex_unlock(&ici->host_lock);
607 file->private_data = icd;
608 dev_dbg(icd->pdev, "camera device open\n");
613 * First four errors are entered with the .host_lock held
618 pm_runtime_disable(&icd->vdev->dev);
620 __soc_camera_power_off(icd);
622 ici->ops->remove(icd);
625 mutex_unlock(&ici->host_lock);
628 module_put(ici->ops->owner);
633 static int soc_camera_close(struct file *file)
635 struct soc_camera_device *icd = file->private_data;
636 struct soc_camera_host *ici = to_soc_camera_host(icd->parent);
638 mutex_lock(&ici->host_lock);
640 if (!icd->use_count) {
641 pm_runtime_suspend(&icd->vdev->dev);
642 pm_runtime_disable(&icd->vdev->dev);
644 if (ici->ops->init_videobuf2)
645 vb2_queue_release(&icd->vb2_vidq);
646 ici->ops->remove(icd);
648 __soc_camera_power_off(icd);
651 if (icd->streamer == file)
652 icd->streamer = NULL;
653 mutex_unlock(&ici->host_lock);
655 module_put(ici->ops->owner);
657 dev_dbg(icd->pdev, "camera device close\n");
662 static ssize_t soc_camera_read(struct file *file, char __user *buf,
663 size_t count, loff_t *ppos)
665 struct soc_camera_device *icd = file->private_data;
666 struct soc_camera_host *ici = to_soc_camera_host(icd->parent);
668 dev_dbg(icd->pdev, "read called, buf %p\n", buf);
670 if (ici->ops->init_videobuf2 && icd->vb2_vidq.io_modes & VB2_READ)
671 return vb2_read(&icd->vb2_vidq, buf, count, ppos,
672 file->f_flags & O_NONBLOCK);
674 dev_err(icd->pdev, "camera device read not implemented\n");
679 static int soc_camera_mmap(struct file *file, struct vm_area_struct *vma)
681 struct soc_camera_device *icd = file->private_data;
682 struct soc_camera_host *ici = to_soc_camera_host(icd->parent);
685 dev_dbg(icd->pdev, "mmap called, vma=0x%08lx\n", (unsigned long)vma);
687 if (icd->streamer != file)
690 if (mutex_lock_interruptible(&ici->host_lock))
692 if (ici->ops->init_videobuf)
693 err = videobuf_mmap_mapper(&icd->vb_vidq, vma);
695 err = vb2_mmap(&icd->vb2_vidq, vma);
696 mutex_unlock(&ici->host_lock);
698 dev_dbg(icd->pdev, "vma start=0x%08lx, size=%ld, ret=%d\n",
699 (unsigned long)vma->vm_start,
700 (unsigned long)vma->vm_end - (unsigned long)vma->vm_start,
706 static unsigned int soc_camera_poll(struct file *file, poll_table *pt)
708 struct soc_camera_device *icd = file->private_data;
709 struct soc_camera_host *ici = to_soc_camera_host(icd->parent);
710 unsigned res = POLLERR;
712 if (icd->streamer != file)
715 mutex_lock(&ici->host_lock);
716 if (ici->ops->init_videobuf && list_empty(&icd->vb_vidq.stream))
717 dev_err(icd->pdev, "Trying to poll with no queued buffers!\n");
719 res = ici->ops->poll(file, pt);
720 mutex_unlock(&ici->host_lock);
724 void soc_camera_lock(struct vb2_queue *vq)
726 struct soc_camera_device *icd = vb2_get_drv_priv(vq);
727 struct soc_camera_host *ici = to_soc_camera_host(icd->parent);
728 mutex_lock(&ici->host_lock);
730 EXPORT_SYMBOL(soc_camera_lock);
732 void soc_camera_unlock(struct vb2_queue *vq)
734 struct soc_camera_device *icd = vb2_get_drv_priv(vq);
735 struct soc_camera_host *ici = to_soc_camera_host(icd->parent);
736 mutex_unlock(&ici->host_lock);
738 EXPORT_SYMBOL(soc_camera_unlock);
740 static struct v4l2_file_operations soc_camera_fops = {
741 .owner = THIS_MODULE,
742 .open = soc_camera_open,
743 .release = soc_camera_close,
744 .unlocked_ioctl = video_ioctl2,
745 .read = soc_camera_read,
746 .mmap = soc_camera_mmap,
747 .poll = soc_camera_poll,
750 static int soc_camera_s_fmt_vid_cap(struct file *file, void *priv,
751 struct v4l2_format *f)
753 struct soc_camera_device *icd = file->private_data;
756 WARN_ON(priv != file->private_data);
758 if (f->type != V4L2_BUF_TYPE_VIDEO_CAPTURE) {
759 dev_warn(icd->pdev, "Wrong buf-type %d\n", f->type);
763 if (icd->streamer && icd->streamer != file)
766 if (is_streaming(to_soc_camera_host(icd->parent), icd)) {
767 dev_err(icd->pdev, "S_FMT denied: queue initialised\n");
771 ret = soc_camera_set_fmt(icd, f);
773 if (!ret && !icd->streamer)
774 icd->streamer = file;
779 static int soc_camera_enum_fmt_vid_cap(struct file *file, void *priv,
780 struct v4l2_fmtdesc *f)
782 struct soc_camera_device *icd = file->private_data;
783 const struct soc_mbus_pixelfmt *format;
785 WARN_ON(priv != file->private_data);
787 if (f->index >= icd->num_user_formats)
790 format = icd->user_formats[f->index].host_fmt;
793 strlcpy(f->description, format->name, sizeof(f->description));
794 f->pixelformat = format->fourcc;
798 static int soc_camera_g_fmt_vid_cap(struct file *file, void *priv,
799 struct v4l2_format *f)
801 struct soc_camera_device *icd = file->private_data;
802 struct v4l2_pix_format *pix = &f->fmt.pix;
804 WARN_ON(priv != file->private_data);
806 if (f->type != V4L2_BUF_TYPE_VIDEO_CAPTURE)
809 pix->width = icd->user_width;
810 pix->height = icd->user_height;
811 pix->bytesperline = icd->bytesperline;
812 pix->sizeimage = icd->sizeimage;
813 pix->field = icd->field;
814 pix->pixelformat = icd->current_fmt->host_fmt->fourcc;
815 pix->colorspace = icd->colorspace;
816 dev_dbg(icd->pdev, "current_fmt->fourcc: 0x%08x\n",
817 icd->current_fmt->host_fmt->fourcc);
821 static int soc_camera_querycap(struct file *file, void *priv,
822 struct v4l2_capability *cap)
824 struct soc_camera_device *icd = file->private_data;
825 struct soc_camera_host *ici = to_soc_camera_host(icd->parent);
827 WARN_ON(priv != file->private_data);
829 strlcpy(cap->driver, ici->drv_name, sizeof(cap->driver));
830 return ici->ops->querycap(ici, cap);
833 static int soc_camera_streamon(struct file *file, void *priv,
834 enum v4l2_buf_type i)
836 struct soc_camera_device *icd = file->private_data;
837 struct soc_camera_host *ici = to_soc_camera_host(icd->parent);
838 struct v4l2_subdev *sd = soc_camera_to_subdev(icd);
841 WARN_ON(priv != file->private_data);
843 if (i != V4L2_BUF_TYPE_VIDEO_CAPTURE)
846 if (icd->streamer != file)
849 /* This calls buf_queue from host driver's videobuf_queue_ops */
850 if (ici->ops->init_videobuf)
851 ret = videobuf_streamon(&icd->vb_vidq);
853 ret = vb2_streamon(&icd->vb2_vidq, i);
856 v4l2_subdev_call(sd, video, s_stream, 1);
861 static int soc_camera_streamoff(struct file *file, void *priv,
862 enum v4l2_buf_type i)
864 struct soc_camera_device *icd = file->private_data;
865 struct v4l2_subdev *sd = soc_camera_to_subdev(icd);
866 struct soc_camera_host *ici = to_soc_camera_host(icd->parent);
868 WARN_ON(priv != file->private_data);
870 if (i != V4L2_BUF_TYPE_VIDEO_CAPTURE)
873 if (icd->streamer != file)
877 * This calls buf_release from host driver's videobuf_queue_ops for all
878 * remaining buffers. When the last buffer is freed, stop capture
880 if (ici->ops->init_videobuf)
881 videobuf_streamoff(&icd->vb_vidq);
883 vb2_streamoff(&icd->vb2_vidq, i);
885 v4l2_subdev_call(sd, video, s_stream, 0);
890 static int soc_camera_cropcap(struct file *file, void *fh,
891 struct v4l2_cropcap *a)
893 struct soc_camera_device *icd = file->private_data;
894 struct soc_camera_host *ici = to_soc_camera_host(icd->parent);
896 return ici->ops->cropcap(icd, a);
899 static int soc_camera_g_crop(struct file *file, void *fh,
902 struct soc_camera_device *icd = file->private_data;
903 struct soc_camera_host *ici = to_soc_camera_host(icd->parent);
906 ret = ici->ops->get_crop(icd, a);
912 * According to the V4L2 API, drivers shall not update the struct v4l2_crop
913 * argument with the actual geometry, instead, the user shall use G_CROP to
916 static int soc_camera_s_crop(struct file *file, void *fh,
917 const struct v4l2_crop *a)
919 struct soc_camera_device *icd = file->private_data;
920 struct soc_camera_host *ici = to_soc_camera_host(icd->parent);
921 const struct v4l2_rect *rect = &a->c;
922 struct v4l2_crop current_crop;
925 if (a->type != V4L2_BUF_TYPE_VIDEO_CAPTURE)
928 dev_dbg(icd->pdev, "S_CROP(%ux%u@%u:%u)\n",
929 rect->width, rect->height, rect->left, rect->top);
931 current_crop.type = a->type;
933 /* If get_crop fails, we'll let host and / or client drivers decide */
934 ret = ici->ops->get_crop(icd, ¤t_crop);
936 /* Prohibit window size change with initialised buffers */
939 "S_CROP denied: getting current crop failed\n");
940 } else if ((a->c.width == current_crop.c.width &&
941 a->c.height == current_crop.c.height) ||
942 !is_streaming(ici, icd)) {
943 /* same size or not streaming - use .set_crop() */
944 ret = ici->ops->set_crop(icd, a);
945 } else if (ici->ops->set_livecrop) {
946 ret = ici->ops->set_livecrop(icd, a);
949 "S_CROP denied: queue initialised and sizes differ\n");
956 static int soc_camera_g_selection(struct file *file, void *fh,
957 struct v4l2_selection *s)
959 struct soc_camera_device *icd = file->private_data;
960 struct soc_camera_host *ici = to_soc_camera_host(icd->parent);
962 /* With a wrong type no need to try to fall back to cropping */
963 if (s->type != V4L2_BUF_TYPE_VIDEO_CAPTURE)
966 if (!ici->ops->get_selection)
969 return ici->ops->get_selection(icd, s);
972 static int soc_camera_s_selection(struct file *file, void *fh,
973 struct v4l2_selection *s)
975 struct soc_camera_device *icd = file->private_data;
976 struct soc_camera_host *ici = to_soc_camera_host(icd->parent);
979 /* In all these cases cropping emulation will not help */
980 if (s->type != V4L2_BUF_TYPE_VIDEO_CAPTURE ||
981 (s->target != V4L2_SEL_TGT_COMPOSE &&
982 s->target != V4L2_SEL_TGT_CROP))
985 if (s->target == V4L2_SEL_TGT_COMPOSE) {
986 /* No output size change during a running capture! */
987 if (is_streaming(ici, icd) &&
988 (icd->user_width != s->r.width ||
989 icd->user_height != s->r.height))
993 * Only one user is allowed to change the output format, touch
994 * buffers, start / stop streaming, poll for data
996 if (icd->streamer && icd->streamer != file)
1000 if (!ici->ops->set_selection)
1003 ret = ici->ops->set_selection(icd, s);
1005 s->target == V4L2_SEL_TGT_COMPOSE) {
1006 icd->user_width = s->r.width;
1007 icd->user_height = s->r.height;
1009 icd->streamer = file;
1015 static int soc_camera_g_parm(struct file *file, void *fh,
1016 struct v4l2_streamparm *a)
1018 struct soc_camera_device *icd = file->private_data;
1019 struct soc_camera_host *ici = to_soc_camera_host(icd->parent);
1021 if (ici->ops->get_parm)
1022 return ici->ops->get_parm(icd, a);
1024 return -ENOIOCTLCMD;
1027 static int soc_camera_s_parm(struct file *file, void *fh,
1028 struct v4l2_streamparm *a)
1030 struct soc_camera_device *icd = file->private_data;
1031 struct soc_camera_host *ici = to_soc_camera_host(icd->parent);
1033 if (ici->ops->set_parm)
1034 return ici->ops->set_parm(icd, a);
1036 return -ENOIOCTLCMD;
1039 static int soc_camera_g_chip_ident(struct file *file, void *fh,
1040 struct v4l2_dbg_chip_ident *id)
1042 struct soc_camera_device *icd = file->private_data;
1043 struct v4l2_subdev *sd = soc_camera_to_subdev(icd);
1045 return v4l2_subdev_call(sd, core, g_chip_ident, id);
1048 #ifdef CONFIG_VIDEO_ADV_DEBUG
1049 static int soc_camera_g_register(struct file *file, void *fh,
1050 struct v4l2_dbg_register *reg)
1052 struct soc_camera_device *icd = file->private_data;
1053 struct v4l2_subdev *sd = soc_camera_to_subdev(icd);
1055 return v4l2_subdev_call(sd, core, g_register, reg);
1058 static int soc_camera_s_register(struct file *file, void *fh,
1059 const struct v4l2_dbg_register *reg)
1061 struct soc_camera_device *icd = file->private_data;
1062 struct v4l2_subdev *sd = soc_camera_to_subdev(icd);
1064 return v4l2_subdev_call(sd, core, s_register, reg);
1068 static int soc_camera_probe(struct soc_camera_device *icd);
1070 /* So far this function cannot fail */
1071 static void scan_add_host(struct soc_camera_host *ici)
1073 struct soc_camera_device *icd;
1075 mutex_lock(&list_lock);
1077 list_for_each_entry(icd, &devices, list) {
1078 if (icd->iface == ici->nr) {
1079 icd->parent = ici->v4l2_dev.dev;
1080 soc_camera_probe(icd);
1084 mutex_unlock(&list_lock);
1087 #ifdef CONFIG_I2C_BOARDINFO
1088 static int soc_camera_init_i2c(struct soc_camera_device *icd,
1089 struct soc_camera_desc *sdesc)
1091 struct i2c_client *client;
1092 struct soc_camera_host *ici = to_soc_camera_host(icd->parent);
1093 struct soc_camera_host_desc *shd = &sdesc->host_desc;
1094 struct i2c_adapter *adap = i2c_get_adapter(shd->i2c_adapter_id);
1095 struct v4l2_subdev *subdev;
1098 dev_err(icd->pdev, "Cannot get I2C adapter #%d. No driver?\n",
1099 shd->i2c_adapter_id);
1103 shd->board_info->platform_data = &sdesc->subdev_desc;
1105 subdev = v4l2_i2c_new_subdev_board(&ici->v4l2_dev, adap,
1106 shd->board_info, NULL);
1110 client = v4l2_get_subdevdata(subdev);
1112 /* Use to_i2c_client(dev) to recover the i2c client */
1113 icd->control = &client->dev;
1117 i2c_put_adapter(adap);
1122 static void soc_camera_free_i2c(struct soc_camera_device *icd)
1124 struct i2c_client *client =
1125 to_i2c_client(to_soc_camera_control(icd));
1126 struct i2c_adapter *adap = client->adapter;
1128 icd->control = NULL;
1129 v4l2_device_unregister_subdev(i2c_get_clientdata(client));
1130 i2c_unregister_device(client);
1131 i2c_put_adapter(adap);
1134 #define soc_camera_init_i2c(icd, sdesc) (-ENODEV)
1135 #define soc_camera_free_i2c(icd) do {} while (0)
1138 static int soc_camera_video_start(struct soc_camera_device *icd);
1139 static int video_dev_create(struct soc_camera_device *icd);
1140 /* Called during host-driver probe */
1141 static int soc_camera_probe(struct soc_camera_device *icd)
1143 struct soc_camera_host *ici = to_soc_camera_host(icd->parent);
1144 struct soc_camera_desc *sdesc = to_soc_camera_desc(icd);
1145 struct soc_camera_host_desc *shd = &sdesc->host_desc;
1146 struct soc_camera_subdev_desc *ssdd = &sdesc->subdev_desc;
1147 struct device *control = NULL;
1148 struct v4l2_subdev *sd;
1149 struct v4l2_mbus_framefmt mf;
1152 dev_info(icd->pdev, "Probing %s\n", dev_name(icd->pdev));
1155 * Currently the subdev with the largest number of controls (13) is
1156 * ov6550. So let's pick 16 as a hint for the control handler. Note
1157 * that this is a hint only: too large and you waste some memory, too
1158 * small and there is a (very) small performance hit when looking up
1159 * controls in the internal hash.
1161 ret = v4l2_ctrl_handler_init(&icd->ctrl_handler, 16);
1165 /* The camera could have been already on, try to reset */
1167 ssdd->reset(icd->pdev);
1169 mutex_lock(&ici->host_lock);
1170 ret = ici->ops->add(icd);
1171 mutex_unlock(&ici->host_lock);
1175 /* Must have icd->vdev before registering the device */
1176 ret = video_dev_create(icd);
1180 /* Non-i2c cameras, e.g., soc_camera_platform, have no board_info */
1181 if (shd->board_info) {
1182 ret = soc_camera_init_i2c(icd, sdesc);
1185 } else if (!shd->add_device || !shd->del_device) {
1189 if (shd->module_name)
1190 ret = request_module(shd->module_name);
1192 ret = shd->add_device(icd);
1197 * FIXME: this is racy, have to use driver-binding notification,
1198 * when it is available
1200 control = to_soc_camera_control(icd);
1201 if (!control || !control->driver || !dev_get_drvdata(control) ||
1202 !try_module_get(control->driver->owner)) {
1203 shd->del_device(icd);
1209 sd = soc_camera_to_subdev(icd);
1210 sd->grp_id = soc_camera_grp_id(icd);
1211 v4l2_set_subdev_hostdata(sd, icd);
1213 ret = v4l2_ctrl_add_handler(&icd->ctrl_handler, sd->ctrl_handler, NULL);
1217 /* At this point client .probe() should have run already */
1218 ret = soc_camera_init_user_formats(icd);
1222 icd->field = V4L2_FIELD_ANY;
1225 * ..._video_start() will create a device node, video_register_device()
1226 * itself is protected against concurrent open() calls, but we also have
1227 * to protect our data.
1229 mutex_lock(&ici->host_lock);
1231 ret = soc_camera_video_start(icd);
1235 /* Try to improve our guess of a reasonable window format */
1236 if (!v4l2_subdev_call(sd, video, g_mbus_fmt, &mf)) {
1237 icd->user_width = mf.width;
1238 icd->user_height = mf.height;
1239 icd->colorspace = mf.colorspace;
1240 icd->field = mf.field;
1243 ici->ops->remove(icd);
1245 mutex_unlock(&ici->host_lock);
1250 mutex_unlock(&ici->host_lock);
1251 soc_camera_free_user_formats(icd);
1254 if (shd->board_info) {
1255 soc_camera_free_i2c(icd);
1257 shd->del_device(icd);
1258 module_put(control->driver->owner);
1262 video_device_release(icd->vdev);
1265 mutex_lock(&ici->host_lock);
1266 ici->ops->remove(icd);
1267 mutex_unlock(&ici->host_lock);
1269 v4l2_ctrl_handler_free(&icd->ctrl_handler);
1274 * This is called on device_unregister, which only means we have to disconnect
1275 * from the host, but not remove ourselves from the device list
1277 static int soc_camera_remove(struct soc_camera_device *icd)
1279 struct soc_camera_desc *sdesc = to_soc_camera_desc(icd);
1280 struct video_device *vdev = icd->vdev;
1282 BUG_ON(!icd->parent);
1284 v4l2_ctrl_handler_free(&icd->ctrl_handler);
1286 video_unregister_device(vdev);
1290 if (sdesc->host_desc.board_info) {
1291 soc_camera_free_i2c(icd);
1293 struct device_driver *drv = to_soc_camera_control(icd)->driver;
1295 sdesc->host_desc.del_device(icd);
1296 module_put(drv->owner);
1299 soc_camera_free_user_formats(icd);
1304 static int default_cropcap(struct soc_camera_device *icd,
1305 struct v4l2_cropcap *a)
1307 struct v4l2_subdev *sd = soc_camera_to_subdev(icd);
1308 return v4l2_subdev_call(sd, video, cropcap, a);
1311 static int default_g_crop(struct soc_camera_device *icd, struct v4l2_crop *a)
1313 struct v4l2_subdev *sd = soc_camera_to_subdev(icd);
1314 return v4l2_subdev_call(sd, video, g_crop, a);
1317 static int default_s_crop(struct soc_camera_device *icd, const struct v4l2_crop *a)
1319 struct v4l2_subdev *sd = soc_camera_to_subdev(icd);
1320 return v4l2_subdev_call(sd, video, s_crop, a);
1323 static int default_g_parm(struct soc_camera_device *icd,
1324 struct v4l2_streamparm *parm)
1326 struct v4l2_subdev *sd = soc_camera_to_subdev(icd);
1327 return v4l2_subdev_call(sd, video, g_parm, parm);
1330 static int default_s_parm(struct soc_camera_device *icd,
1331 struct v4l2_streamparm *parm)
1333 struct v4l2_subdev *sd = soc_camera_to_subdev(icd);
1334 return v4l2_subdev_call(sd, video, s_parm, parm);
1337 static int default_enum_framesizes(struct soc_camera_device *icd,
1338 struct v4l2_frmsizeenum *fsize)
1341 struct v4l2_subdev *sd = soc_camera_to_subdev(icd);
1342 const struct soc_camera_format_xlate *xlate;
1343 __u32 pixfmt = fsize->pixel_format;
1344 struct v4l2_frmsizeenum fsize_mbus = *fsize;
1346 xlate = soc_camera_xlate_by_fourcc(icd, pixfmt);
1349 /* map xlate-code to pixel_format, sensor only handle xlate-code*/
1350 fsize_mbus.pixel_format = xlate->code;
1352 ret = v4l2_subdev_call(sd, video, enum_framesizes, &fsize_mbus);
1356 *fsize = fsize_mbus;
1357 fsize->pixel_format = pixfmt;
1362 int soc_camera_host_register(struct soc_camera_host *ici)
1364 struct soc_camera_host *ix;
1367 if (!ici || !ici->ops ||
1368 !ici->ops->try_fmt ||
1369 !ici->ops->set_fmt ||
1370 !ici->ops->set_bus_param ||
1371 !ici->ops->querycap ||
1372 ((!ici->ops->init_videobuf ||
1373 !ici->ops->reqbufs) &&
1374 !ici->ops->init_videobuf2) ||
1376 !ici->ops->remove ||
1381 if (!ici->ops->set_crop)
1382 ici->ops->set_crop = default_s_crop;
1383 if (!ici->ops->get_crop)
1384 ici->ops->get_crop = default_g_crop;
1385 if (!ici->ops->cropcap)
1386 ici->ops->cropcap = default_cropcap;
1387 if (!ici->ops->set_parm)
1388 ici->ops->set_parm = default_s_parm;
1389 if (!ici->ops->get_parm)
1390 ici->ops->get_parm = default_g_parm;
1391 if (!ici->ops->enum_framesizes)
1392 ici->ops->enum_framesizes = default_enum_framesizes;
1394 mutex_lock(&list_lock);
1395 list_for_each_entry(ix, &hosts, list) {
1396 if (ix->nr == ici->nr) {
1402 ret = v4l2_device_register(ici->v4l2_dev.dev, &ici->v4l2_dev);
1406 list_add_tail(&ici->list, &hosts);
1407 mutex_unlock(&list_lock);
1409 mutex_init(&ici->host_lock);
1415 mutex_unlock(&list_lock);
1418 EXPORT_SYMBOL(soc_camera_host_register);
1420 /* Unregister all clients! */
1421 void soc_camera_host_unregister(struct soc_camera_host *ici)
1423 struct soc_camera_device *icd;
1425 mutex_lock(&list_lock);
1427 list_del(&ici->list);
1428 list_for_each_entry(icd, &devices, list)
1429 if (icd->iface == ici->nr && to_soc_camera_control(icd))
1430 soc_camera_remove(icd);
1432 mutex_unlock(&list_lock);
1434 v4l2_device_unregister(&ici->v4l2_dev);
1436 EXPORT_SYMBOL(soc_camera_host_unregister);
1438 /* Image capture device */
1439 static int soc_camera_device_register(struct soc_camera_device *icd)
1441 struct soc_camera_device *ix;
1444 for (i = 0; i < 256 && num < 0; i++) {
1446 /* Check if this index is available on this interface */
1447 list_for_each_entry(ix, &devices, list) {
1448 if (ix->iface == icd->iface && ix->devnum == i) {
1457 * ok, we have 256 cameras on this host...
1458 * man, stay reasonable...
1464 icd->host_priv = NULL;
1466 list_add_tail(&icd->list, &devices);
1471 static const struct v4l2_ioctl_ops soc_camera_ioctl_ops = {
1472 .vidioc_querycap = soc_camera_querycap,
1473 .vidioc_try_fmt_vid_cap = soc_camera_try_fmt_vid_cap,
1474 .vidioc_g_fmt_vid_cap = soc_camera_g_fmt_vid_cap,
1475 .vidioc_s_fmt_vid_cap = soc_camera_s_fmt_vid_cap,
1476 .vidioc_enum_fmt_vid_cap = soc_camera_enum_fmt_vid_cap,
1477 .vidioc_enum_input = soc_camera_enum_input,
1478 .vidioc_g_input = soc_camera_g_input,
1479 .vidioc_s_input = soc_camera_s_input,
1480 .vidioc_s_std = soc_camera_s_std,
1481 .vidioc_g_std = soc_camera_g_std,
1482 .vidioc_enum_framesizes = soc_camera_enum_framesizes,
1483 .vidioc_reqbufs = soc_camera_reqbufs,
1484 .vidioc_querybuf = soc_camera_querybuf,
1485 .vidioc_qbuf = soc_camera_qbuf,
1486 .vidioc_dqbuf = soc_camera_dqbuf,
1487 .vidioc_create_bufs = soc_camera_create_bufs,
1488 .vidioc_prepare_buf = soc_camera_prepare_buf,
1489 .vidioc_streamon = soc_camera_streamon,
1490 .vidioc_streamoff = soc_camera_streamoff,
1491 .vidioc_cropcap = soc_camera_cropcap,
1492 .vidioc_g_crop = soc_camera_g_crop,
1493 .vidioc_s_crop = soc_camera_s_crop,
1494 .vidioc_g_selection = soc_camera_g_selection,
1495 .vidioc_s_selection = soc_camera_s_selection,
1496 .vidioc_g_parm = soc_camera_g_parm,
1497 .vidioc_s_parm = soc_camera_s_parm,
1498 .vidioc_g_chip_ident = soc_camera_g_chip_ident,
1499 #ifdef CONFIG_VIDEO_ADV_DEBUG
1500 .vidioc_g_register = soc_camera_g_register,
1501 .vidioc_s_register = soc_camera_s_register,
1505 static int video_dev_create(struct soc_camera_device *icd)
1507 struct soc_camera_host *ici = to_soc_camera_host(icd->parent);
1508 struct video_device *vdev = video_device_alloc();
1513 strlcpy(vdev->name, ici->drv_name, sizeof(vdev->name));
1515 vdev->parent = icd->pdev;
1516 vdev->current_norm = V4L2_STD_UNKNOWN;
1517 vdev->fops = &soc_camera_fops;
1518 vdev->ioctl_ops = &soc_camera_ioctl_ops;
1519 vdev->release = video_device_release;
1520 vdev->tvnorms = V4L2_STD_UNKNOWN;
1521 vdev->ctrl_handler = &icd->ctrl_handler;
1522 vdev->lock = &ici->host_lock;
1530 * Called from soc_camera_probe() above with .host_lock held
1532 static int soc_camera_video_start(struct soc_camera_device *icd)
1534 const struct device_type *type = icd->vdev->dev.type;
1540 ret = video_register_device(icd->vdev, VFL_TYPE_GRABBER, -1);
1542 dev_err(icd->pdev, "video_register_device failed: %d\n", ret);
1546 /* Restore device type, possibly set by the subdevice driver */
1547 icd->vdev->dev.type = type;
1552 static int soc_camera_pdrv_probe(struct platform_device *pdev)
1554 struct soc_camera_desc *sdesc = pdev->dev.platform_data;
1555 struct soc_camera_subdev_desc *ssdd = &sdesc->subdev_desc;
1556 struct soc_camera_device *icd;
1562 icd = devm_kzalloc(&pdev->dev, sizeof(*icd), GFP_KERNEL);
1566 ret = devm_regulator_bulk_get(&pdev->dev, ssdd->num_regulators,
1571 icd->iface = sdesc->host_desc.bus_id;
1573 icd->pdev = &pdev->dev;
1574 platform_set_drvdata(pdev, icd);
1576 icd->user_width = DEFAULT_WIDTH;
1577 icd->user_height = DEFAULT_HEIGHT;
1579 return soc_camera_device_register(icd);
1583 * Only called on rmmod for each platform device, since they are not
1584 * hot-pluggable. Now we know, that all our users - hosts and devices have
1585 * been unloaded already
1587 static int soc_camera_pdrv_remove(struct platform_device *pdev)
1589 struct soc_camera_device *icd = platform_get_drvdata(pdev);
1594 list_del(&icd->list);
1599 static struct platform_driver __refdata soc_camera_pdrv = {
1600 .probe = soc_camera_pdrv_probe,
1601 .remove = soc_camera_pdrv_remove,
1603 .name = "soc-camera-pdrv",
1604 .owner = THIS_MODULE,
1608 module_platform_driver(soc_camera_pdrv);
1610 MODULE_DESCRIPTION("Image capture bus driver");
1611 MODULE_AUTHOR("Guennadi Liakhovetski <kernel@pengutronix.de>");
1612 MODULE_LICENSE("GPL");
1613 MODULE_ALIAS("platform:soc-camera-pdrv");