2 * camera image capture (abstract) bus driver
4 * Copyright (C) 2008, Guennadi Liakhovetski <kernel@pengutronix.de>
6 * This driver provides an interface between platform-specific camera
7 * busses and camera devices. It should be used if the camera is
8 * connected not over a "proper" bus like PCI or USB, but over a
9 * special bus, like, for example, the Quick Capture interface on PXA270
10 * SoCs. Later it should also be used for i.MX31 SoCs from Freescale.
11 * It can handle multiple cameras and / or multiple busses, which can
12 * be used, e.g., in stereo-vision applications.
14 * This program is free software; you can redistribute it and/or modify
15 * it under the terms of the GNU General Public License version 2 as
16 * published by the Free Software Foundation.
19 #include <linux/device.h>
20 #include <linux/err.h>
21 #include <linux/i2c.h>
22 #include <linux/init.h>
23 #include <linux/list.h>
24 #include <linux/mutex.h>
25 #include <linux/module.h>
26 #include <linux/platform_device.h>
27 #include <linux/vmalloc.h>
29 #include <media/soc_camera.h>
30 #include <media/v4l2-common.h>
31 #include <media/v4l2-ioctl.h>
32 #include <media/v4l2-dev.h>
33 #include <media/videobuf-core.h>
35 /* Default to VGA resolution */
36 #define DEFAULT_WIDTH 640
37 #define DEFAULT_HEIGHT 480
39 static LIST_HEAD(hosts);
40 static LIST_HEAD(devices);
41 static DEFINE_MUTEX(list_lock); /* Protects the list of hosts */
43 const struct soc_camera_data_format *soc_camera_format_by_fourcc(
44 struct soc_camera_device *icd, unsigned int fourcc)
48 for (i = 0; i < icd->num_formats; i++)
49 if (icd->formats[i].fourcc == fourcc)
50 return icd->formats + i;
53 EXPORT_SYMBOL(soc_camera_format_by_fourcc);
55 const struct soc_camera_format_xlate *soc_camera_xlate_by_fourcc(
56 struct soc_camera_device *icd, unsigned int fourcc)
60 for (i = 0; i < icd->num_user_formats; i++)
61 if (icd->user_formats[i].host_fmt->fourcc == fourcc)
62 return icd->user_formats + i;
65 EXPORT_SYMBOL(soc_camera_xlate_by_fourcc);
68 * soc_camera_apply_sensor_flags() - apply platform SOCAM_SENSOR_INVERT_* flags
69 * @icl: camera platform parameters
70 * @flags: flags to be inverted according to platform configuration
71 * @return: resulting flags
73 unsigned long soc_camera_apply_sensor_flags(struct soc_camera_link *icl,
78 /* If only one of the two polarities is supported, switch to the opposite */
79 if (icl->flags & SOCAM_SENSOR_INVERT_HSYNC) {
80 f = flags & (SOCAM_HSYNC_ACTIVE_HIGH | SOCAM_HSYNC_ACTIVE_LOW);
81 if (f == SOCAM_HSYNC_ACTIVE_HIGH || f == SOCAM_HSYNC_ACTIVE_LOW)
82 flags ^= SOCAM_HSYNC_ACTIVE_HIGH | SOCAM_HSYNC_ACTIVE_LOW;
85 if (icl->flags & SOCAM_SENSOR_INVERT_VSYNC) {
86 f = flags & (SOCAM_VSYNC_ACTIVE_HIGH | SOCAM_VSYNC_ACTIVE_LOW);
87 if (f == SOCAM_VSYNC_ACTIVE_HIGH || f == SOCAM_VSYNC_ACTIVE_LOW)
88 flags ^= SOCAM_VSYNC_ACTIVE_HIGH | SOCAM_VSYNC_ACTIVE_LOW;
91 if (icl->flags & SOCAM_SENSOR_INVERT_PCLK) {
92 f = flags & (SOCAM_PCLK_SAMPLE_RISING | SOCAM_PCLK_SAMPLE_FALLING);
93 if (f == SOCAM_PCLK_SAMPLE_RISING || f == SOCAM_PCLK_SAMPLE_FALLING)
94 flags ^= SOCAM_PCLK_SAMPLE_RISING | SOCAM_PCLK_SAMPLE_FALLING;
99 EXPORT_SYMBOL(soc_camera_apply_sensor_flags);
101 static int soc_camera_try_fmt_vid_cap(struct file *file, void *priv,
102 struct v4l2_format *f)
104 struct soc_camera_file *icf = file->private_data;
105 struct soc_camera_device *icd = icf->icd;
106 struct soc_camera_host *ici = to_soc_camera_host(icd->dev.parent);
108 WARN_ON(priv != file->private_data);
110 /* limit format to hardware capabilities */
111 return ici->ops->try_fmt(icd, f);
114 static int soc_camera_enum_input(struct file *file, void *priv,
115 struct v4l2_input *inp)
117 struct soc_camera_file *icf = file->private_data;
118 struct soc_camera_device *icd = icf->icd;
124 if (icd->ops->enum_input)
125 ret = icd->ops->enum_input(icd, inp);
127 /* default is camera */
128 inp->type = V4L2_INPUT_TYPE_CAMERA;
129 inp->std = V4L2_STD_UNKNOWN;
130 strcpy(inp->name, "Camera");
136 static int soc_camera_g_input(struct file *file, void *priv, unsigned int *i)
143 static int soc_camera_s_input(struct file *file, void *priv, unsigned int i)
151 static int soc_camera_s_std(struct file *file, void *priv, v4l2_std_id *a)
153 struct soc_camera_file *icf = file->private_data;
154 struct soc_camera_device *icd = icf->icd;
157 if (icd->ops->set_std)
158 ret = icd->ops->set_std(icd, a);
163 static int soc_camera_reqbufs(struct file *file, void *priv,
164 struct v4l2_requestbuffers *p)
167 struct soc_camera_file *icf = file->private_data;
168 struct soc_camera_device *icd = icf->icd;
169 struct soc_camera_host *ici = to_soc_camera_host(icd->dev.parent);
171 WARN_ON(priv != file->private_data);
173 ret = videobuf_reqbufs(&icf->vb_vidq, p);
177 return ici->ops->reqbufs(icf, p);
180 static int soc_camera_querybuf(struct file *file, void *priv,
181 struct v4l2_buffer *p)
183 struct soc_camera_file *icf = file->private_data;
185 WARN_ON(priv != file->private_data);
187 return videobuf_querybuf(&icf->vb_vidq, p);
190 static int soc_camera_qbuf(struct file *file, void *priv,
191 struct v4l2_buffer *p)
193 struct soc_camera_file *icf = file->private_data;
195 WARN_ON(priv != file->private_data);
197 return videobuf_qbuf(&icf->vb_vidq, p);
200 static int soc_camera_dqbuf(struct file *file, void *priv,
201 struct v4l2_buffer *p)
203 struct soc_camera_file *icf = file->private_data;
205 WARN_ON(priv != file->private_data);
207 return videobuf_dqbuf(&icf->vb_vidq, p, file->f_flags & O_NONBLOCK);
210 /* Always entered with .video_lock held */
211 static int soc_camera_init_user_formats(struct soc_camera_device *icd)
213 struct soc_camera_host *ici = to_soc_camera_host(icd->dev.parent);
216 if (!ici->ops->get_formats)
218 * Fallback mode - the host will have to serve all
219 * sensor-provided formats one-to-one to the user
221 fmts = icd->num_formats;
224 * First pass - only count formats this host-sensor
225 * configuration can provide
227 for (i = 0; i < icd->num_formats; i++)
228 fmts += ici->ops->get_formats(icd, i, NULL);
234 vmalloc(fmts * sizeof(struct soc_camera_format_xlate));
235 if (!icd->user_formats)
238 icd->num_user_formats = fmts;
240 dev_dbg(&icd->dev, "Found %d supported formats.\n", fmts);
242 /* Second pass - actually fill data formats */
244 for (i = 0; i < icd->num_formats; i++)
245 if (!ici->ops->get_formats) {
246 icd->user_formats[i].host_fmt = icd->formats + i;
247 icd->user_formats[i].cam_fmt = icd->formats + i;
248 icd->user_formats[i].buswidth = icd->formats[i].depth;
250 fmts += ici->ops->get_formats(icd, i,
251 &icd->user_formats[fmts]);
254 icd->current_fmt = icd->user_formats[0].host_fmt;
259 /* Always entered with .video_lock held */
260 static void soc_camera_free_user_formats(struct soc_camera_device *icd)
262 icd->current_fmt = NULL;
263 vfree(icd->user_formats);
264 icd->user_formats = NULL;
267 /* Called with .vb_lock held */
268 static int soc_camera_set_fmt(struct soc_camera_file *icf,
269 struct v4l2_format *f)
271 struct soc_camera_device *icd = icf->icd;
272 struct soc_camera_host *ici = to_soc_camera_host(icd->dev.parent);
273 struct v4l2_pix_format *pix = &f->fmt.pix;
276 /* We always call try_fmt() before set_fmt() or set_crop() */
277 ret = ici->ops->try_fmt(icd, f);
281 ret = ici->ops->set_fmt(icd, f);
284 } else if (!icd->current_fmt ||
285 icd->current_fmt->fourcc != pix->pixelformat) {
286 dev_err(ici->v4l2_dev.dev,
287 "Host driver hasn't set up current format correctly!\n");
291 icd->width = pix->width;
292 icd->height = pix->height;
294 icd->field = pix->field;
296 if (f->type != V4L2_BUF_TYPE_VIDEO_CAPTURE)
297 dev_warn(&icd->dev, "Attention! Wrong buf-type %d\n",
300 dev_dbg(&icd->dev, "set width: %d height: %d\n",
301 icd->width, icd->height);
303 /* set physical bus parameters */
304 return ici->ops->set_bus_param(icd, pix->pixelformat);
307 static int soc_camera_open(struct file *file)
309 struct video_device *vdev = video_devdata(file);
310 struct soc_camera_device *icd = container_of(vdev->parent, struct soc_camera_device, dev);
311 struct soc_camera_link *icl = to_soc_camera_link(icd);
312 struct soc_camera_host *ici;
313 struct soc_camera_file *icf;
317 /* No device driver attached */
320 ici = to_soc_camera_host(icd->dev.parent);
322 icf = vmalloc(sizeof(*icf));
326 if (!try_module_get(ici->ops->owner)) {
327 dev_err(&icd->dev, "Couldn't lock capture bus driver.\n");
332 /* Protect against icd->ops->remove() until we module_get() both drivers. */
333 mutex_lock(&icd->video_lock);
338 /* Now we really have to activate the camera */
339 if (icd->use_count == 1) {
340 /* Restore parameters before the last close() per V4L2 API */
341 struct v4l2_format f = {
342 .type = V4L2_BUF_TYPE_VIDEO_CAPTURE,
345 .height = icd->height,
350 ret = soc_camera_init_user_formats(icd);
354 f.fmt.pix.pixelformat = icd->current_fmt->fourcc;
355 f.fmt.pix.colorspace = icd->current_fmt->colorspace;
358 ret = icl->power(icd->pdev, 1);
363 /* The camera could have been already on, try to reset */
365 icl->reset(icd->pdev);
367 ret = ici->ops->add(icd);
369 dev_err(&icd->dev, "Couldn't activate the camera: %d\n", ret);
373 if (icd->ops->init) {
374 ret = icd->ops->init(icd);
379 /* Try to configure with default parameters */
380 ret = soc_camera_set_fmt(icf, &f);
385 file->private_data = icf;
386 dev_dbg(&icd->dev, "camera device open\n");
388 ici->ops->init_videobuf(&icf->vb_vidq, icd);
390 mutex_unlock(&icd->video_lock);
395 * First five errors are entered with the .video_lock held
399 if (icd->ops->release)
400 icd->ops->release(icd);
402 ici->ops->remove(icd);
405 icl->power(icd->pdev, 0);
407 soc_camera_free_user_formats(icd);
410 mutex_unlock(&icd->video_lock);
411 module_put(ici->ops->owner);
417 static int soc_camera_close(struct file *file)
419 struct soc_camera_file *icf = file->private_data;
420 struct soc_camera_device *icd = icf->icd;
421 struct soc_camera_host *ici = to_soc_camera_host(icd->dev.parent);
422 struct video_device *vdev = icd->vdev;
424 mutex_lock(&icd->video_lock);
426 if (!icd->use_count) {
427 struct soc_camera_link *icl = to_soc_camera_link(icd);
429 if (icd->ops->release)
430 icd->ops->release(icd);
431 ici->ops->remove(icd);
433 icl->power(icd->pdev, 0);
434 soc_camera_free_user_formats(icd);
437 mutex_unlock(&icd->video_lock);
439 module_put(ici->ops->owner);
443 dev_dbg(vdev->parent, "camera device close\n");
448 static ssize_t soc_camera_read(struct file *file, char __user *buf,
449 size_t count, loff_t *ppos)
451 struct soc_camera_file *icf = file->private_data;
452 struct soc_camera_device *icd = icf->icd;
453 struct video_device *vdev = icd->vdev;
456 dev_err(vdev->parent, "camera device read not implemented\n");
461 static int soc_camera_mmap(struct file *file, struct vm_area_struct *vma)
463 struct soc_camera_file *icf = file->private_data;
464 struct soc_camera_device *icd = icf->icd;
467 dev_dbg(&icd->dev, "mmap called, vma=0x%08lx\n", (unsigned long)vma);
469 err = videobuf_mmap_mapper(&icf->vb_vidq, vma);
471 dev_dbg(&icd->dev, "vma start=0x%08lx, size=%ld, ret=%d\n",
472 (unsigned long)vma->vm_start,
473 (unsigned long)vma->vm_end - (unsigned long)vma->vm_start,
479 static unsigned int soc_camera_poll(struct file *file, poll_table *pt)
481 struct soc_camera_file *icf = file->private_data;
482 struct soc_camera_device *icd = icf->icd;
483 struct soc_camera_host *ici = to_soc_camera_host(icd->dev.parent);
485 if (list_empty(&icf->vb_vidq.stream)) {
486 dev_err(&icd->dev, "Trying to poll with no queued buffers!\n");
490 return ici->ops->poll(file, pt);
493 static struct v4l2_file_operations soc_camera_fops = {
494 .owner = THIS_MODULE,
495 .open = soc_camera_open,
496 .release = soc_camera_close,
497 .ioctl = video_ioctl2,
498 .read = soc_camera_read,
499 .mmap = soc_camera_mmap,
500 .poll = soc_camera_poll,
503 static int soc_camera_s_fmt_vid_cap(struct file *file, void *priv,
504 struct v4l2_format *f)
506 struct soc_camera_file *icf = file->private_data;
507 struct soc_camera_device *icd = icf->icd;
510 WARN_ON(priv != file->private_data);
512 mutex_lock(&icf->vb_vidq.vb_lock);
514 if (videobuf_queue_is_busy(&icf->vb_vidq)) {
515 dev_err(&icd->dev, "S_FMT denied: queue busy\n");
520 ret = soc_camera_set_fmt(icf, f);
523 mutex_unlock(&icf->vb_vidq.vb_lock);
528 static int soc_camera_enum_fmt_vid_cap(struct file *file, void *priv,
529 struct v4l2_fmtdesc *f)
531 struct soc_camera_file *icf = file->private_data;
532 struct soc_camera_device *icd = icf->icd;
533 const struct soc_camera_data_format *format;
535 WARN_ON(priv != file->private_data);
537 if (f->index >= icd->num_user_formats)
540 format = icd->user_formats[f->index].host_fmt;
542 strlcpy(f->description, format->name, sizeof(f->description));
543 f->pixelformat = format->fourcc;
547 static int soc_camera_g_fmt_vid_cap(struct file *file, void *priv,
548 struct v4l2_format *f)
550 struct soc_camera_file *icf = file->private_data;
551 struct soc_camera_device *icd = icf->icd;
552 struct v4l2_pix_format *pix = &f->fmt.pix;
554 WARN_ON(priv != file->private_data);
556 pix->width = icd->width;
557 pix->height = icd->height;
558 pix->field = icf->vb_vidq.field;
559 pix->pixelformat = icd->current_fmt->fourcc;
560 pix->bytesperline = pix->width *
561 DIV_ROUND_UP(icd->current_fmt->depth, 8);
562 pix->sizeimage = pix->height * pix->bytesperline;
563 dev_dbg(&icd->dev, "current_fmt->fourcc: 0x%08x\n",
564 icd->current_fmt->fourcc);
568 static int soc_camera_querycap(struct file *file, void *priv,
569 struct v4l2_capability *cap)
571 struct soc_camera_file *icf = file->private_data;
572 struct soc_camera_device *icd = icf->icd;
573 struct soc_camera_host *ici = to_soc_camera_host(icd->dev.parent);
575 WARN_ON(priv != file->private_data);
577 strlcpy(cap->driver, ici->drv_name, sizeof(cap->driver));
578 return ici->ops->querycap(ici, cap);
581 static int soc_camera_streamon(struct file *file, void *priv,
582 enum v4l2_buf_type i)
584 struct soc_camera_file *icf = file->private_data;
585 struct soc_camera_device *icd = icf->icd;
586 struct soc_camera_host *ici = to_soc_camera_host(icd->dev.parent);
589 WARN_ON(priv != file->private_data);
591 if (i != V4L2_BUF_TYPE_VIDEO_CAPTURE)
594 mutex_lock(&icd->video_lock);
596 v4l2_device_call_until_err(&ici->v4l2_dev, (__u32)icd, video, s_stream, 1);
598 /* This calls buf_queue from host driver's videobuf_queue_ops */
599 ret = videobuf_streamon(&icf->vb_vidq);
601 mutex_unlock(&icd->video_lock);
606 static int soc_camera_streamoff(struct file *file, void *priv,
607 enum v4l2_buf_type i)
609 struct soc_camera_file *icf = file->private_data;
610 struct soc_camera_device *icd = icf->icd;
611 struct soc_camera_host *ici = to_soc_camera_host(icd->dev.parent);
613 WARN_ON(priv != file->private_data);
615 if (i != V4L2_BUF_TYPE_VIDEO_CAPTURE)
618 mutex_lock(&icd->video_lock);
620 /* This calls buf_release from host driver's videobuf_queue_ops for all
621 * remaining buffers. When the last buffer is freed, stop capture */
622 videobuf_streamoff(&icf->vb_vidq);
624 v4l2_device_call_until_err(&ici->v4l2_dev, (__u32)icd, video, s_stream, 0);
626 mutex_unlock(&icd->video_lock);
631 static int soc_camera_queryctrl(struct file *file, void *priv,
632 struct v4l2_queryctrl *qc)
634 struct soc_camera_file *icf = file->private_data;
635 struct soc_camera_device *icd = icf->icd;
638 WARN_ON(priv != file->private_data);
643 for (i = 0; i < icd->ops->num_controls; i++)
644 if (qc->id == icd->ops->controls[i].id) {
645 memcpy(qc, &(icd->ops->controls[i]),
653 static int soc_camera_g_ctrl(struct file *file, void *priv,
654 struct v4l2_control *ctrl)
656 struct soc_camera_file *icf = file->private_data;
657 struct soc_camera_device *icd = icf->icd;
658 struct soc_camera_host *ici = to_soc_camera_host(icd->dev.parent);
660 WARN_ON(priv != file->private_data);
664 if (icd->gain == (unsigned short)~0)
666 ctrl->value = icd->gain;
668 case V4L2_CID_EXPOSURE:
669 if (icd->exposure == (unsigned short)~0)
671 ctrl->value = icd->exposure;
675 return v4l2_device_call_until_err(&ici->v4l2_dev, (__u32)icd, core, g_ctrl, ctrl);
678 static int soc_camera_s_ctrl(struct file *file, void *priv,
679 struct v4l2_control *ctrl)
681 struct soc_camera_file *icf = file->private_data;
682 struct soc_camera_device *icd = icf->icd;
683 struct soc_camera_host *ici = to_soc_camera_host(icd->dev.parent);
685 WARN_ON(priv != file->private_data);
687 return v4l2_device_call_until_err(&ici->v4l2_dev, (__u32)icd, core, s_ctrl, ctrl);
690 static int soc_camera_cropcap(struct file *file, void *fh,
691 struct v4l2_cropcap *a)
693 struct soc_camera_file *icf = file->private_data;
694 struct soc_camera_device *icd = icf->icd;
696 a->type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
697 a->bounds.left = icd->x_min;
698 a->bounds.top = icd->y_min;
699 a->bounds.width = icd->width_max;
700 a->bounds.height = icd->height_max;
701 a->defrect.left = icd->x_min;
702 a->defrect.top = icd->y_min;
703 a->defrect.width = DEFAULT_WIDTH;
704 a->defrect.height = DEFAULT_HEIGHT;
705 a->pixelaspect.numerator = 1;
706 a->pixelaspect.denominator = 1;
711 static int soc_camera_g_crop(struct file *file, void *fh,
714 struct soc_camera_file *icf = file->private_data;
715 struct soc_camera_device *icd = icf->icd;
717 a->type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
718 a->c.left = icd->x_current;
719 a->c.top = icd->y_current;
720 a->c.width = icd->width;
721 a->c.height = icd->height;
726 static int soc_camera_s_crop(struct file *file, void *fh,
729 struct soc_camera_file *icf = file->private_data;
730 struct soc_camera_device *icd = icf->icd;
731 struct soc_camera_host *ici = to_soc_camera_host(icd->dev.parent);
734 if (a->type != V4L2_BUF_TYPE_VIDEO_CAPTURE)
737 /* Cropping is allowed during a running capture, guard consistency */
738 mutex_lock(&icf->vb_vidq.vb_lock);
740 ret = ici->ops->set_crop(icd, &a->c);
742 icd->width = a->c.width;
743 icd->height = a->c.height;
744 icd->x_current = a->c.left;
745 icd->y_current = a->c.top;
748 mutex_unlock(&icf->vb_vidq.vb_lock);
753 static int soc_camera_g_chip_ident(struct file *file, void *fh,
754 struct v4l2_dbg_chip_ident *id)
756 struct soc_camera_file *icf = file->private_data;
757 struct soc_camera_device *icd = icf->icd;
758 struct soc_camera_host *ici = to_soc_camera_host(icd->dev.parent);
760 return v4l2_device_call_until_err(&ici->v4l2_dev, (__u32)icd, core, g_chip_ident, id);
763 #ifdef CONFIG_VIDEO_ADV_DEBUG
764 static int soc_camera_g_register(struct file *file, void *fh,
765 struct v4l2_dbg_register *reg)
767 struct soc_camera_file *icf = file->private_data;
768 struct soc_camera_device *icd = icf->icd;
769 struct soc_camera_host *ici = to_soc_camera_host(icd->dev.parent);
771 return v4l2_device_call_until_err(&ici->v4l2_dev, (__u32)icd, core, g_register, reg);
774 static int soc_camera_s_register(struct file *file, void *fh,
775 struct v4l2_dbg_register *reg)
777 struct soc_camera_file *icf = file->private_data;
778 struct soc_camera_device *icd = icf->icd;
779 struct soc_camera_host *ici = to_soc_camera_host(icd->dev.parent);
781 return v4l2_device_call_until_err(&ici->v4l2_dev, (__u32)icd, core, s_register, reg);
785 /* So far this function cannot fail */
786 static void scan_add_host(struct soc_camera_host *ici)
788 struct soc_camera_device *icd;
790 mutex_lock(&list_lock);
792 list_for_each_entry(icd, &devices, list) {
793 if (icd->iface == ici->nr) {
795 icd->dev.parent = ici->v4l2_dev.dev;
796 dev_set_name(&icd->dev, "%u-%u", icd->iface,
798 ret = device_register(&icd->dev);
800 icd->dev.parent = NULL;
802 "Cannot register device: %d\n", ret);
807 mutex_unlock(&list_lock);
810 #ifdef CONFIG_I2C_BOARDINFO
811 static int soc_camera_init_i2c(struct soc_camera_device *icd,
812 struct soc_camera_link *icl)
814 struct i2c_client *client;
815 struct soc_camera_host *ici = to_soc_camera_host(icd->dev.parent);
816 struct i2c_adapter *adap = i2c_get_adapter(icl->i2c_adapter_id);
817 struct v4l2_subdev *subdev;
822 dev_err(&icd->dev, "Cannot get I2C adapter #%d. No driver?\n",
823 icl->i2c_adapter_id);
827 icl->board_info->platform_data = icd;
829 subdev = v4l2_i2c_new_subdev_board(&ici->v4l2_dev, adap,
830 icl->module_name, icl->board_info, NULL);
836 subdev->grp_id = (__u32)icd;
837 client = subdev->priv;
839 /* Use to_i2c_client(dev) to recover the i2c client */
840 dev_set_drvdata(&icd->dev, &client->dev);
844 i2c_put_adapter(adap);
849 static void soc_camera_free_i2c(struct soc_camera_device *icd)
851 struct i2c_client *client =
852 to_i2c_client(to_soc_camera_control(icd));
853 dev_set_drvdata(&icd->dev, NULL);
854 v4l2_device_unregister_subdev(i2c_get_clientdata(client));
855 i2c_unregister_device(client);
856 i2c_put_adapter(client->adapter);
859 #define soc_camera_init_i2c(icd, icl) (-ENODEV)
860 #define soc_camera_free_i2c(icd) do {} while (0)
863 static int soc_camera_video_start(struct soc_camera_device *icd);
864 static int video_dev_create(struct soc_camera_device *icd);
865 /* Called during host-driver probe */
866 static int soc_camera_probe(struct device *dev)
868 struct soc_camera_device *icd = to_soc_camera_dev(dev);
869 struct soc_camera_host *ici = to_soc_camera_host(dev->parent);
870 struct soc_camera_link *icl = to_soc_camera_link(icd);
871 struct device *control = NULL;
874 dev_info(dev, "Probing %s\n", dev_name(dev));
877 ret = icl->power(icd->pdev, 1);
880 "Platform failed to power-on the camera.\n");
885 /* The camera could have been already on, try to reset */
887 icl->reset(icd->pdev);
889 ret = ici->ops->add(icd);
893 /* Must have icd->vdev before registering the device */
894 ret = video_dev_create(icd);
898 /* Non-i2c cameras, e.g., soc_camera_platform, have no board_info */
899 if (icl->board_info) {
900 ret = soc_camera_init_i2c(icd, icl);
903 } else if (!icl->add_device || !icl->del_device) {
907 if (icl->module_name)
908 ret = request_module(icl->module_name);
910 ret = icl->add_device(icl, &icd->dev);
914 /* FIXME: this is racy, have to use driver-binding notification */
915 control = to_soc_camera_control(icd);
916 if (!control || !control->driver ||
917 !try_module_get(control->driver->owner)) {
918 icl->del_device(icl);
923 /* ..._video_start() will create a device node, so we have to protect */
924 mutex_lock(&icd->video_lock);
926 ret = soc_camera_video_start(icd);
930 /* Do we have to sysfs_remove_link() before device_unregister()? */
931 if (to_soc_camera_control(icd) &&
932 sysfs_create_link(&icd->dev.kobj, &to_soc_camera_control(icd)->kobj,
934 dev_warn(&icd->dev, "Failed creating the control symlink\n");
936 ici->ops->remove(icd);
939 icl->power(icd->pdev, 0);
941 mutex_unlock(&icd->video_lock);
946 mutex_unlock(&icd->video_lock);
947 if (icl->board_info) {
948 soc_camera_free_i2c(icd);
950 icl->del_device(icl);
951 module_put(control->driver->owner);
955 video_device_release(icd->vdev);
957 ici->ops->remove(icd);
960 icl->power(icd->pdev, 0);
965 /* This is called on device_unregister, which only means we have to disconnect
966 * from the host, but not remove ourselves from the device list */
967 static int soc_camera_remove(struct device *dev)
969 struct soc_camera_device *icd = to_soc_camera_dev(dev);
970 struct soc_camera_link *icl = to_soc_camera_link(icd);
971 struct video_device *vdev = icd->vdev;
973 BUG_ON(!dev->parent);
976 mutex_lock(&icd->video_lock);
977 video_unregister_device(vdev);
979 mutex_unlock(&icd->video_lock);
982 if (icl->board_info) {
983 soc_camera_free_i2c(icd);
985 struct device_driver *drv = to_soc_camera_control(icd) ?
986 to_soc_camera_control(icd)->driver : NULL;
988 icl->del_device(icl);
989 module_put(drv->owner);
996 static int soc_camera_suspend(struct device *dev, pm_message_t state)
998 struct soc_camera_device *icd = to_soc_camera_dev(dev);
999 struct soc_camera_host *ici = to_soc_camera_host(icd->dev.parent);
1002 if (ici->ops->suspend)
1003 ret = ici->ops->suspend(icd, state);
1008 static int soc_camera_resume(struct device *dev)
1010 struct soc_camera_device *icd = to_soc_camera_dev(dev);
1011 struct soc_camera_host *ici = to_soc_camera_host(icd->dev.parent);
1014 if (ici->ops->resume)
1015 ret = ici->ops->resume(icd);
1020 static struct bus_type soc_camera_bus_type = {
1021 .name = "soc-camera",
1022 .probe = soc_camera_probe,
1023 .remove = soc_camera_remove,
1024 .suspend = soc_camera_suspend,
1025 .resume = soc_camera_resume,
1028 static struct device_driver ic_drv = {
1030 .bus = &soc_camera_bus_type,
1031 .owner = THIS_MODULE,
1034 static void dummy_release(struct device *dev)
1038 int soc_camera_host_register(struct soc_camera_host *ici)
1040 struct soc_camera_host *ix;
1043 if (!ici || !ici->ops ||
1044 !ici->ops->try_fmt ||
1045 !ici->ops->set_fmt ||
1046 !ici->ops->set_crop ||
1047 !ici->ops->set_bus_param ||
1048 !ici->ops->querycap ||
1049 !ici->ops->init_videobuf ||
1050 !ici->ops->reqbufs ||
1052 !ici->ops->remove ||
1057 mutex_lock(&list_lock);
1058 list_for_each_entry(ix, &hosts, list) {
1059 if (ix->nr == ici->nr) {
1065 ret = v4l2_device_register(ici->v4l2_dev.dev, &ici->v4l2_dev);
1069 list_add_tail(&ici->list, &hosts);
1070 mutex_unlock(&list_lock);
1077 mutex_unlock(&list_lock);
1080 EXPORT_SYMBOL(soc_camera_host_register);
1082 /* Unregister all clients! */
1083 void soc_camera_host_unregister(struct soc_camera_host *ici)
1085 struct soc_camera_device *icd;
1087 mutex_lock(&list_lock);
1089 list_del(&ici->list);
1091 list_for_each_entry(icd, &devices, list) {
1092 if (icd->iface == ici->nr) {
1093 /* The bus->remove will be called */
1094 device_unregister(&icd->dev);
1095 /* Not before device_unregister(), .remove
1096 * needs parent to call ici->ops->remove() */
1097 icd->dev.parent = NULL;
1099 /* If the host module is loaded again, device_register()
1100 * would complain "already initialised" */
1101 memset(&icd->dev.kobj, 0, sizeof(icd->dev.kobj));
1105 mutex_unlock(&list_lock);
1107 v4l2_device_unregister(&ici->v4l2_dev);
1109 EXPORT_SYMBOL(soc_camera_host_unregister);
1111 /* Image capture device */
1112 static int soc_camera_device_register(struct soc_camera_device *icd)
1114 struct soc_camera_device *ix;
1117 for (i = 0; i < 256 && num < 0; i++) {
1119 /* Check if this index is available on this interface */
1120 list_for_each_entry(ix, &devices, list) {
1121 if (ix->iface == icd->iface && ix->devnum == i) {
1129 /* ok, we have 256 cameras on this host...
1130 * man, stay reasonable... */
1134 icd->dev.bus = &soc_camera_bus_type;
1136 icd->dev.release = dummy_release;
1138 icd->host_priv = NULL;
1139 mutex_init(&icd->video_lock);
1141 list_add_tail(&icd->list, &devices);
1146 static void soc_camera_device_unregister(struct soc_camera_device *icd)
1148 list_del(&icd->list);
1151 static const struct v4l2_ioctl_ops soc_camera_ioctl_ops = {
1152 .vidioc_querycap = soc_camera_querycap,
1153 .vidioc_g_fmt_vid_cap = soc_camera_g_fmt_vid_cap,
1154 .vidioc_enum_fmt_vid_cap = soc_camera_enum_fmt_vid_cap,
1155 .vidioc_s_fmt_vid_cap = soc_camera_s_fmt_vid_cap,
1156 .vidioc_enum_input = soc_camera_enum_input,
1157 .vidioc_g_input = soc_camera_g_input,
1158 .vidioc_s_input = soc_camera_s_input,
1159 .vidioc_s_std = soc_camera_s_std,
1160 .vidioc_reqbufs = soc_camera_reqbufs,
1161 .vidioc_try_fmt_vid_cap = soc_camera_try_fmt_vid_cap,
1162 .vidioc_querybuf = soc_camera_querybuf,
1163 .vidioc_qbuf = soc_camera_qbuf,
1164 .vidioc_dqbuf = soc_camera_dqbuf,
1165 .vidioc_streamon = soc_camera_streamon,
1166 .vidioc_streamoff = soc_camera_streamoff,
1167 .vidioc_queryctrl = soc_camera_queryctrl,
1168 .vidioc_g_ctrl = soc_camera_g_ctrl,
1169 .vidioc_s_ctrl = soc_camera_s_ctrl,
1170 .vidioc_cropcap = soc_camera_cropcap,
1171 .vidioc_g_crop = soc_camera_g_crop,
1172 .vidioc_s_crop = soc_camera_s_crop,
1173 .vidioc_g_chip_ident = soc_camera_g_chip_ident,
1174 #ifdef CONFIG_VIDEO_ADV_DEBUG
1175 .vidioc_g_register = soc_camera_g_register,
1176 .vidioc_s_register = soc_camera_s_register,
1180 static int video_dev_create(struct soc_camera_device *icd)
1182 struct soc_camera_host *ici = to_soc_camera_host(icd->dev.parent);
1183 struct video_device *vdev = video_device_alloc();
1188 strlcpy(vdev->name, ici->drv_name, sizeof(vdev->name));
1190 vdev->parent = &icd->dev;
1191 vdev->current_norm = V4L2_STD_UNKNOWN;
1192 vdev->fops = &soc_camera_fops;
1193 vdev->ioctl_ops = &soc_camera_ioctl_ops;
1194 vdev->release = video_device_release;
1196 vdev->tvnorms = V4L2_STD_UNKNOWN;
1204 * Called from soc_camera_probe() above (with .video_lock held???)
1206 static int soc_camera_video_start(struct soc_camera_device *icd)
1208 const struct v4l2_queryctrl *qctrl;
1211 if (!icd->dev.parent)
1215 !icd->ops->query_bus_param ||
1216 !icd->ops->set_bus_param)
1219 ret = video_register_device(icd->vdev, VFL_TYPE_GRABBER,
1222 dev_err(&icd->dev, "video_register_device failed: %d\n", ret);
1226 qctrl = soc_camera_find_qctrl(icd->ops, V4L2_CID_GAIN);
1227 icd->gain = qctrl ? qctrl->default_value : (unsigned short)~0;
1228 qctrl = soc_camera_find_qctrl(icd->ops, V4L2_CID_EXPOSURE);
1229 icd->exposure = qctrl ? qctrl->default_value : (unsigned short)~0;
1234 static int __devinit soc_camera_pdrv_probe(struct platform_device *pdev)
1236 struct soc_camera_link *icl = pdev->dev.platform_data;
1237 struct soc_camera_device *icd;
1243 icd = kzalloc(sizeof(*icd), GFP_KERNEL);
1247 icd->iface = icl->bus_id;
1248 icd->pdev = &pdev->dev;
1249 platform_set_drvdata(pdev, icd);
1250 icd->dev.platform_data = icl;
1252 ret = soc_camera_device_register(icd);
1264 /* Only called on rmmod for each platform device, since they are not
1265 * hot-pluggable. Now we know, that all our users - hosts and devices have
1266 * been unloaded already */
1267 static int __devexit soc_camera_pdrv_remove(struct platform_device *pdev)
1269 struct soc_camera_device *icd = platform_get_drvdata(pdev);
1274 soc_camera_device_unregister(icd);
1281 static struct platform_driver __refdata soc_camera_pdrv = {
1282 .remove = __devexit_p(soc_camera_pdrv_remove),
1284 .name = "soc-camera-pdrv",
1285 .owner = THIS_MODULE,
1289 static int __init soc_camera_init(void)
1291 int ret = bus_register(&soc_camera_bus_type);
1294 ret = driver_register(&ic_drv);
1298 ret = platform_driver_probe(&soc_camera_pdrv, soc_camera_pdrv_probe);
1305 driver_unregister(&ic_drv);
1307 bus_unregister(&soc_camera_bus_type);
1311 static void __exit soc_camera_exit(void)
1313 platform_driver_unregister(&soc_camera_pdrv);
1314 driver_unregister(&ic_drv);
1315 bus_unregister(&soc_camera_bus_type);
1318 module_init(soc_camera_init);
1319 module_exit(soc_camera_exit);
1321 MODULE_DESCRIPTION("Image capture bus driver");
1322 MODULE_AUTHOR("Guennadi Liakhovetski <kernel@pengutronix.de>");
1323 MODULE_LICENSE("GPL");
1324 MODULE_ALIAS("platform:soc-camera-pdrv");