984 lines
24 KiB
C
984 lines
24 KiB
C
/*
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* camera image capture (abstract) bus driver
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*
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* Copyright (C) 2008, Guennadi Liakhovetski <kernel@pengutronix.de>
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*
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* This driver provides an interface between platform-specific camera
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* busses and camera devices. It should be used if the camera is
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* connected not over a "proper" bus like PCI or USB, but over a
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* special bus, like, for example, the Quick Capture interface on PXA270
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* SoCs. Later it should also be used for i.MX31 SoCs from Freescale.
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* It can handle multiple cameras and / or multiple busses, which can
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* be used, e.g., in stereo-vision applications.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*/
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#include <linux/module.h>
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#include <linux/init.h>
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#include <linux/device.h>
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#include <linux/list.h>
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#include <linux/err.h>
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#include <linux/mutex.h>
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#include <linux/vmalloc.h>
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#include <media/v4l2-common.h>
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#include <media/v4l2-ioctl.h>
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#include <media/v4l2-dev.h>
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#include <media/videobuf-core.h>
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#include <media/soc_camera.h>
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static LIST_HEAD(hosts);
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static LIST_HEAD(devices);
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static DEFINE_MUTEX(list_lock);
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static DEFINE_MUTEX(video_lock);
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const struct soc_camera_data_format *soc_camera_format_by_fourcc(
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struct soc_camera_device *icd, unsigned int fourcc)
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{
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unsigned int i;
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for (i = 0; i < icd->num_formats; i++)
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if (icd->formats[i].fourcc == fourcc)
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return icd->formats + i;
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return NULL;
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}
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EXPORT_SYMBOL(soc_camera_format_by_fourcc);
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static int soc_camera_try_fmt_vid_cap(struct file *file, void *priv,
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struct v4l2_format *f)
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{
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struct soc_camera_file *icf = file->private_data;
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struct soc_camera_device *icd = icf->icd;
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struct soc_camera_host *ici =
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to_soc_camera_host(icd->dev.parent);
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enum v4l2_field field;
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int ret;
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WARN_ON(priv != file->private_data);
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/*
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* TODO: this might also have to migrate to host-drivers, if anyone
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* wishes to support other fields
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*/
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field = f->fmt.pix.field;
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if (field == V4L2_FIELD_ANY) {
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f->fmt.pix.field = V4L2_FIELD_NONE;
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} else if (field != V4L2_FIELD_NONE) {
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dev_err(&icd->dev, "Field type invalid.\n");
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return -EINVAL;
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}
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/* limit format to hardware capabilities */
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ret = ici->ops->try_fmt(icd, f);
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return ret;
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}
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static int soc_camera_enum_input(struct file *file, void *priv,
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struct v4l2_input *inp)
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{
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if (inp->index != 0)
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return -EINVAL;
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inp->type = V4L2_INPUT_TYPE_CAMERA;
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inp->std = V4L2_STD_UNKNOWN;
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strcpy(inp->name, "Camera");
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return 0;
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}
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static int soc_camera_g_input(struct file *file, void *priv, unsigned int *i)
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{
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*i = 0;
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return 0;
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}
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static int soc_camera_s_input(struct file *file, void *priv, unsigned int i)
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{
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if (i > 0)
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return -EINVAL;
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return 0;
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}
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static int soc_camera_s_std(struct file *file, void *priv, v4l2_std_id *a)
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{
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return 0;
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}
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static int soc_camera_reqbufs(struct file *file, void *priv,
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struct v4l2_requestbuffers *p)
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{
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int ret;
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struct soc_camera_file *icf = file->private_data;
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struct soc_camera_device *icd = icf->icd;
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struct soc_camera_host *ici =
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to_soc_camera_host(icd->dev.parent);
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WARN_ON(priv != file->private_data);
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dev_dbg(&icd->dev, "%s: %d\n", __func__, p->memory);
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ret = videobuf_reqbufs(&icf->vb_vidq, p);
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if (ret < 0)
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return ret;
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return ici->ops->reqbufs(icf, p);
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}
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static int soc_camera_querybuf(struct file *file, void *priv,
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struct v4l2_buffer *p)
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{
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struct soc_camera_file *icf = file->private_data;
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WARN_ON(priv != file->private_data);
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return videobuf_querybuf(&icf->vb_vidq, p);
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}
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static int soc_camera_qbuf(struct file *file, void *priv,
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struct v4l2_buffer *p)
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{
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struct soc_camera_file *icf = file->private_data;
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WARN_ON(priv != file->private_data);
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return videobuf_qbuf(&icf->vb_vidq, p);
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}
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static int soc_camera_dqbuf(struct file *file, void *priv,
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struct v4l2_buffer *p)
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{
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struct soc_camera_file *icf = file->private_data;
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WARN_ON(priv != file->private_data);
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return videobuf_dqbuf(&icf->vb_vidq, p, file->f_flags & O_NONBLOCK);
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}
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static int soc_camera_open(struct inode *inode, struct file *file)
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{
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struct video_device *vdev;
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struct soc_camera_device *icd;
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struct soc_camera_host *ici;
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struct soc_camera_file *icf;
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int ret;
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icf = vmalloc(sizeof(*icf));
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if (!icf)
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return -ENOMEM;
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/* Protect against icd->remove() until we module_get() both drivers. */
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mutex_lock(&video_lock);
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vdev = video_devdata(file);
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icd = container_of(vdev->parent, struct soc_camera_device, dev);
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ici = to_soc_camera_host(icd->dev.parent);
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if (!try_module_get(icd->ops->owner)) {
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dev_err(&icd->dev, "Couldn't lock sensor driver.\n");
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ret = -EINVAL;
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goto emgd;
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}
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if (!try_module_get(ici->ops->owner)) {
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dev_err(&icd->dev, "Couldn't lock capture bus driver.\n");
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ret = -EINVAL;
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goto emgi;
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}
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icf->icd = icd;
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icd->use_count++;
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/* Now we really have to activate the camera */
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if (icd->use_count == 1) {
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ret = ici->ops->add(icd);
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if (ret < 0) {
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dev_err(&icd->dev, "Couldn't activate the camera: %d\n", ret);
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icd->use_count--;
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goto eiciadd;
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}
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}
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mutex_unlock(&video_lock);
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file->private_data = icf;
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dev_dbg(&icd->dev, "camera device open\n");
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ici->ops->init_videobuf(&icf->vb_vidq, icd);
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return 0;
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/* All errors are entered with the video_lock held */
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eiciadd:
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module_put(ici->ops->owner);
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emgi:
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module_put(icd->ops->owner);
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emgd:
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mutex_unlock(&video_lock);
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vfree(icf);
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return ret;
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}
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static int soc_camera_close(struct inode *inode, struct file *file)
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{
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struct soc_camera_file *icf = file->private_data;
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struct soc_camera_device *icd = icf->icd;
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struct soc_camera_host *ici = to_soc_camera_host(icd->dev.parent);
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struct video_device *vdev = icd->vdev;
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mutex_lock(&video_lock);
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icd->use_count--;
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if (!icd->use_count)
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ici->ops->remove(icd);
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module_put(icd->ops->owner);
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module_put(ici->ops->owner);
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mutex_unlock(&video_lock);
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vfree(icf);
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dev_dbg(vdev->parent, "camera device close\n");
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return 0;
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}
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static ssize_t soc_camera_read(struct file *file, char __user *buf,
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size_t count, loff_t *ppos)
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{
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struct soc_camera_file *icf = file->private_data;
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struct soc_camera_device *icd = icf->icd;
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struct video_device *vdev = icd->vdev;
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int err = -EINVAL;
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dev_err(vdev->parent, "camera device read not implemented\n");
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return err;
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}
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static int soc_camera_mmap(struct file *file, struct vm_area_struct *vma)
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{
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struct soc_camera_file *icf = file->private_data;
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struct soc_camera_device *icd = icf->icd;
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int err;
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dev_dbg(&icd->dev, "mmap called, vma=0x%08lx\n", (unsigned long)vma);
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err = videobuf_mmap_mapper(&icf->vb_vidq, vma);
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dev_dbg(&icd->dev, "vma start=0x%08lx, size=%ld, ret=%d\n",
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(unsigned long)vma->vm_start,
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(unsigned long)vma->vm_end - (unsigned long)vma->vm_start,
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err);
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return err;
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}
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static unsigned int soc_camera_poll(struct file *file, poll_table *pt)
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{
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struct soc_camera_file *icf = file->private_data;
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struct soc_camera_device *icd = icf->icd;
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struct soc_camera_host *ici =
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to_soc_camera_host(icd->dev.parent);
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if (list_empty(&icf->vb_vidq.stream)) {
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dev_err(&icd->dev, "Trying to poll with no queued buffers!\n");
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return POLLERR;
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}
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return ici->ops->poll(file, pt);
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}
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static struct file_operations soc_camera_fops = {
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.owner = THIS_MODULE,
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.open = soc_camera_open,
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.release = soc_camera_close,
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.ioctl = video_ioctl2,
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.read = soc_camera_read,
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.mmap = soc_camera_mmap,
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.poll = soc_camera_poll,
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.llseek = no_llseek,
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};
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static int soc_camera_s_fmt_vid_cap(struct file *file, void *priv,
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struct v4l2_format *f)
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{
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struct soc_camera_file *icf = file->private_data;
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struct soc_camera_device *icd = icf->icd;
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struct soc_camera_host *ici =
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to_soc_camera_host(icd->dev.parent);
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int ret;
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struct v4l2_rect rect;
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WARN_ON(priv != file->private_data);
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ret = soc_camera_try_fmt_vid_cap(file, priv, f);
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if (ret < 0)
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return ret;
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rect.left = icd->x_current;
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rect.top = icd->y_current;
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rect.width = f->fmt.pix.width;
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rect.height = f->fmt.pix.height;
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ret = ici->ops->set_fmt(icd, f->fmt.pix.pixelformat, &rect);
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if (ret < 0) {
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return ret;
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} else if (!icd->current_fmt ||
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icd->current_fmt->fourcc != f->fmt.pix.pixelformat) {
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dev_err(&ici->dev, "Host driver hasn't set up current "
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"format correctly!\n");
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return -EINVAL;
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}
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/* buswidth may be further adjusted by the ici */
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icd->buswidth = icd->current_fmt->depth;
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icd->width = rect.width;
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icd->height = rect.height;
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icf->vb_vidq.field = f->fmt.pix.field;
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if (f->type != V4L2_BUF_TYPE_VIDEO_CAPTURE)
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dev_warn(&icd->dev, "Attention! Wrong buf-type %d\n",
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f->type);
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dev_dbg(&icd->dev, "set width: %d height: %d\n",
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icd->width, icd->height);
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/* set physical bus parameters */
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return ici->ops->set_bus_param(icd, f->fmt.pix.pixelformat);
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}
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static int soc_camera_enum_fmt_vid_cap(struct file *file, void *priv,
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struct v4l2_fmtdesc *f)
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{
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struct soc_camera_file *icf = file->private_data;
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struct soc_camera_device *icd = icf->icd;
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const struct soc_camera_data_format *format;
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WARN_ON(priv != file->private_data);
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if (f->index >= icd->num_formats)
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return -EINVAL;
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format = &icd->formats[f->index];
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strlcpy(f->description, format->name, sizeof(f->description));
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f->pixelformat = format->fourcc;
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return 0;
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}
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static int soc_camera_g_fmt_vid_cap(struct file *file, void *priv,
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struct v4l2_format *f)
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{
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struct soc_camera_file *icf = file->private_data;
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struct soc_camera_device *icd = icf->icd;
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WARN_ON(priv != file->private_data);
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f->fmt.pix.width = icd->width;
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f->fmt.pix.height = icd->height;
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f->fmt.pix.field = icf->vb_vidq.field;
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f->fmt.pix.pixelformat = icd->current_fmt->fourcc;
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f->fmt.pix.bytesperline = f->fmt.pix.width *
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DIV_ROUND_UP(icd->current_fmt->depth, 8);
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f->fmt.pix.sizeimage = f->fmt.pix.height * f->fmt.pix.bytesperline;
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dev_dbg(&icd->dev, "current_fmt->fourcc: 0x%08x\n",
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icd->current_fmt->fourcc);
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return 0;
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}
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static int soc_camera_querycap(struct file *file, void *priv,
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struct v4l2_capability *cap)
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{
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struct soc_camera_file *icf = file->private_data;
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struct soc_camera_device *icd = icf->icd;
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struct soc_camera_host *ici =
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to_soc_camera_host(icd->dev.parent);
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WARN_ON(priv != file->private_data);
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strlcpy(cap->driver, ici->drv_name, sizeof(cap->driver));
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return ici->ops->querycap(ici, cap);
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}
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static int soc_camera_streamon(struct file *file, void *priv,
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enum v4l2_buf_type i)
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{
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struct soc_camera_file *icf = file->private_data;
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struct soc_camera_device *icd = icf->icd;
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WARN_ON(priv != file->private_data);
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dev_dbg(&icd->dev, "%s\n", __func__);
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if (i != V4L2_BUF_TYPE_VIDEO_CAPTURE)
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return -EINVAL;
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icd->ops->start_capture(icd);
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/* This calls buf_queue from host driver's videobuf_queue_ops */
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return videobuf_streamon(&icf->vb_vidq);
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}
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static int soc_camera_streamoff(struct file *file, void *priv,
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enum v4l2_buf_type i)
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{
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struct soc_camera_file *icf = file->private_data;
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struct soc_camera_device *icd = icf->icd;
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WARN_ON(priv != file->private_data);
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dev_dbg(&icd->dev, "%s\n", __func__);
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if (i != V4L2_BUF_TYPE_VIDEO_CAPTURE)
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return -EINVAL;
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|
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/* This calls buf_release from host driver's videobuf_queue_ops for all
|
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* remaining buffers. When the last buffer is freed, stop capture */
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videobuf_streamoff(&icf->vb_vidq);
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icd->ops->stop_capture(icd);
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return 0;
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}
|
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|
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static int soc_camera_queryctrl(struct file *file, void *priv,
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struct v4l2_queryctrl *qc)
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{
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struct soc_camera_file *icf = file->private_data;
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struct soc_camera_device *icd = icf->icd;
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int i;
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WARN_ON(priv != file->private_data);
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|
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if (!qc->id)
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return -EINVAL;
|
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|
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for (i = 0; i < icd->ops->num_controls; i++)
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if (qc->id == icd->ops->controls[i].id) {
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memcpy(qc, &(icd->ops->controls[i]),
|
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sizeof(*qc));
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return 0;
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}
|
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|
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return -EINVAL;
|
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}
|
|
|
|
static int soc_camera_g_ctrl(struct file *file, void *priv,
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struct v4l2_control *ctrl)
|
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{
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struct soc_camera_file *icf = file->private_data;
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struct soc_camera_device *icd = icf->icd;
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WARN_ON(priv != file->private_data);
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switch (ctrl->id) {
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case V4L2_CID_GAIN:
|
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if (icd->gain == (unsigned short)~0)
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return -EINVAL;
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ctrl->value = icd->gain;
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return 0;
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case V4L2_CID_EXPOSURE:
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if (icd->exposure == (unsigned short)~0)
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return -EINVAL;
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ctrl->value = icd->exposure;
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return 0;
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}
|
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|
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if (icd->ops->get_control)
|
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return icd->ops->get_control(icd, ctrl);
|
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return -EINVAL;
|
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}
|
|
|
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static int soc_camera_s_ctrl(struct file *file, void *priv,
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struct v4l2_control *ctrl)
|
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{
|
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struct soc_camera_file *icf = file->private_data;
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struct soc_camera_device *icd = icf->icd;
|
|
|
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WARN_ON(priv != file->private_data);
|
|
|
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if (icd->ops->set_control)
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return icd->ops->set_control(icd, ctrl);
|
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return -EINVAL;
|
|
}
|
|
|
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static int soc_camera_cropcap(struct file *file, void *fh,
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struct v4l2_cropcap *a)
|
|
{
|
|
struct soc_camera_file *icf = file->private_data;
|
|
struct soc_camera_device *icd = icf->icd;
|
|
|
|
a->type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
|
|
a->bounds.left = icd->x_min;
|
|
a->bounds.top = icd->y_min;
|
|
a->bounds.width = icd->width_max;
|
|
a->bounds.height = icd->height_max;
|
|
a->defrect.left = icd->x_min;
|
|
a->defrect.top = icd->y_min;
|
|
a->defrect.width = 640;
|
|
a->defrect.height = 480;
|
|
a->pixelaspect.numerator = 1;
|
|
a->pixelaspect.denominator = 1;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int soc_camera_g_crop(struct file *file, void *fh,
|
|
struct v4l2_crop *a)
|
|
{
|
|
struct soc_camera_file *icf = file->private_data;
|
|
struct soc_camera_device *icd = icf->icd;
|
|
|
|
a->type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
|
|
a->c.left = icd->x_current;
|
|
a->c.top = icd->y_current;
|
|
a->c.width = icd->width;
|
|
a->c.height = icd->height;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int soc_camera_s_crop(struct file *file, void *fh,
|
|
struct v4l2_crop *a)
|
|
{
|
|
struct soc_camera_file *icf = file->private_data;
|
|
struct soc_camera_device *icd = icf->icd;
|
|
struct soc_camera_host *ici =
|
|
to_soc_camera_host(icd->dev.parent);
|
|
int ret;
|
|
|
|
if (a->type != V4L2_BUF_TYPE_VIDEO_CAPTURE)
|
|
return -EINVAL;
|
|
|
|
ret = ici->ops->set_fmt(icd, 0, &a->c);
|
|
if (!ret) {
|
|
icd->width = a->c.width;
|
|
icd->height = a->c.height;
|
|
icd->x_current = a->c.left;
|
|
icd->y_current = a->c.top;
|
|
}
|
|
|
|
return ret;
|
|
}
|
|
|
|
static int soc_camera_g_chip_ident(struct file *file, void *fh,
|
|
struct v4l2_chip_ident *id)
|
|
{
|
|
struct soc_camera_file *icf = file->private_data;
|
|
struct soc_camera_device *icd = icf->icd;
|
|
|
|
if (!icd->ops->get_chip_id)
|
|
return -EINVAL;
|
|
|
|
return icd->ops->get_chip_id(icd, id);
|
|
}
|
|
|
|
#ifdef CONFIG_VIDEO_ADV_DEBUG
|
|
static int soc_camera_g_register(struct file *file, void *fh,
|
|
struct v4l2_register *reg)
|
|
{
|
|
struct soc_camera_file *icf = file->private_data;
|
|
struct soc_camera_device *icd = icf->icd;
|
|
|
|
if (!icd->ops->get_register)
|
|
return -EINVAL;
|
|
|
|
return icd->ops->get_register(icd, reg);
|
|
}
|
|
|
|
static int soc_camera_s_register(struct file *file, void *fh,
|
|
struct v4l2_register *reg)
|
|
{
|
|
struct soc_camera_file *icf = file->private_data;
|
|
struct soc_camera_device *icd = icf->icd;
|
|
|
|
if (!icd->ops->set_register)
|
|
return -EINVAL;
|
|
|
|
return icd->ops->set_register(icd, reg);
|
|
}
|
|
#endif
|
|
|
|
static int device_register_link(struct soc_camera_device *icd)
|
|
{
|
|
int ret = device_register(&icd->dev);
|
|
|
|
if (ret < 0) {
|
|
/* Prevent calling device_unregister() */
|
|
icd->dev.parent = NULL;
|
|
dev_err(&icd->dev, "Cannot register device: %d\n", ret);
|
|
/* Even if probe() was unsuccessful for all registered drivers,
|
|
* device_register() returns 0, and we add the link, just to
|
|
* document this camera's control device */
|
|
} else if (icd->control)
|
|
/* Have to sysfs_remove_link() before device_unregister()? */
|
|
if (sysfs_create_link(&icd->dev.kobj, &icd->control->kobj,
|
|
"control"))
|
|
dev_warn(&icd->dev,
|
|
"Failed creating the control symlink\n");
|
|
return ret;
|
|
}
|
|
|
|
/* So far this function cannot fail */
|
|
static void scan_add_host(struct soc_camera_host *ici)
|
|
{
|
|
struct soc_camera_device *icd;
|
|
|
|
mutex_lock(&list_lock);
|
|
|
|
list_for_each_entry(icd, &devices, list) {
|
|
if (icd->iface == ici->nr) {
|
|
icd->dev.parent = &ici->dev;
|
|
device_register_link(icd);
|
|
}
|
|
}
|
|
|
|
mutex_unlock(&list_lock);
|
|
}
|
|
|
|
/* return: 0 if no match found or a match found and
|
|
* device_register() successful, error code otherwise */
|
|
static int scan_add_device(struct soc_camera_device *icd)
|
|
{
|
|
struct soc_camera_host *ici;
|
|
int ret = 0;
|
|
|
|
mutex_lock(&list_lock);
|
|
|
|
list_add_tail(&icd->list, &devices);
|
|
|
|
/* Watch out for class_for_each_device / class_find_device API by
|
|
* Dave Young <hidave.darkstar@gmail.com> */
|
|
list_for_each_entry(ici, &hosts, list) {
|
|
if (icd->iface == ici->nr) {
|
|
ret = 1;
|
|
icd->dev.parent = &ici->dev;
|
|
break;
|
|
}
|
|
}
|
|
|
|
mutex_unlock(&list_lock);
|
|
|
|
if (ret)
|
|
ret = device_register_link(icd);
|
|
|
|
return ret;
|
|
}
|
|
|
|
static int soc_camera_probe(struct device *dev)
|
|
{
|
|
struct soc_camera_device *icd = to_soc_camera_dev(dev);
|
|
struct soc_camera_host *ici =
|
|
to_soc_camera_host(icd->dev.parent);
|
|
int ret;
|
|
|
|
if (!icd->ops->probe)
|
|
return -ENODEV;
|
|
|
|
/* We only call ->add() here to activate and probe the camera.
|
|
* We shall ->remove() and deactivate it immediately afterwards. */
|
|
ret = ici->ops->add(icd);
|
|
if (ret < 0)
|
|
return ret;
|
|
|
|
ret = icd->ops->probe(icd);
|
|
if (ret >= 0) {
|
|
const struct v4l2_queryctrl *qctrl;
|
|
|
|
qctrl = soc_camera_find_qctrl(icd->ops, V4L2_CID_GAIN);
|
|
icd->gain = qctrl ? qctrl->default_value : (unsigned short)~0;
|
|
qctrl = soc_camera_find_qctrl(icd->ops, V4L2_CID_EXPOSURE);
|
|
icd->exposure = qctrl ? qctrl->default_value :
|
|
(unsigned short)~0;
|
|
}
|
|
ici->ops->remove(icd);
|
|
|
|
return ret;
|
|
}
|
|
|
|
/* This is called on device_unregister, which only means we have to disconnect
|
|
* from the host, but not remove ourselves from the device list */
|
|
static int soc_camera_remove(struct device *dev)
|
|
{
|
|
struct soc_camera_device *icd = to_soc_camera_dev(dev);
|
|
|
|
if (icd->ops->remove)
|
|
icd->ops->remove(icd);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int soc_camera_suspend(struct device *dev, pm_message_t state)
|
|
{
|
|
struct soc_camera_device *icd = to_soc_camera_dev(dev);
|
|
struct soc_camera_host *ici = to_soc_camera_host(icd->dev.parent);
|
|
int ret = 0;
|
|
|
|
if (ici->ops->suspend)
|
|
ret = ici->ops->suspend(icd, state);
|
|
|
|
return ret;
|
|
}
|
|
|
|
static int soc_camera_resume(struct device *dev)
|
|
{
|
|
struct soc_camera_device *icd = to_soc_camera_dev(dev);
|
|
struct soc_camera_host *ici = to_soc_camera_host(icd->dev.parent);
|
|
int ret = 0;
|
|
|
|
if (ici->ops->resume)
|
|
ret = ici->ops->resume(icd);
|
|
|
|
return ret;
|
|
}
|
|
|
|
static struct bus_type soc_camera_bus_type = {
|
|
.name = "soc-camera",
|
|
.probe = soc_camera_probe,
|
|
.remove = soc_camera_remove,
|
|
.suspend = soc_camera_suspend,
|
|
.resume = soc_camera_resume,
|
|
};
|
|
|
|
static struct device_driver ic_drv = {
|
|
.name = "camera",
|
|
.bus = &soc_camera_bus_type,
|
|
.owner = THIS_MODULE,
|
|
};
|
|
|
|
static void dummy_release(struct device *dev)
|
|
{
|
|
}
|
|
|
|
int soc_camera_host_register(struct soc_camera_host *ici)
|
|
{
|
|
int ret;
|
|
struct soc_camera_host *ix;
|
|
|
|
if (!ici->ops->init_videobuf || !ici->ops->add || !ici->ops->remove)
|
|
return -EINVAL;
|
|
|
|
/* Number might be equal to the platform device ID */
|
|
dev_set_name(&ici->dev, "camera_host%d", ici->nr);
|
|
|
|
mutex_lock(&list_lock);
|
|
list_for_each_entry(ix, &hosts, list) {
|
|
if (ix->nr == ici->nr) {
|
|
mutex_unlock(&list_lock);
|
|
return -EBUSY;
|
|
}
|
|
}
|
|
|
|
list_add_tail(&ici->list, &hosts);
|
|
mutex_unlock(&list_lock);
|
|
|
|
ici->dev.release = dummy_release;
|
|
|
|
ret = device_register(&ici->dev);
|
|
|
|
if (ret)
|
|
goto edevr;
|
|
|
|
scan_add_host(ici);
|
|
|
|
return 0;
|
|
|
|
edevr:
|
|
mutex_lock(&list_lock);
|
|
list_del(&ici->list);
|
|
mutex_unlock(&list_lock);
|
|
|
|
return ret;
|
|
}
|
|
EXPORT_SYMBOL(soc_camera_host_register);
|
|
|
|
/* Unregister all clients! */
|
|
void soc_camera_host_unregister(struct soc_camera_host *ici)
|
|
{
|
|
struct soc_camera_device *icd;
|
|
|
|
mutex_lock(&list_lock);
|
|
|
|
list_del(&ici->list);
|
|
|
|
list_for_each_entry(icd, &devices, list) {
|
|
if (icd->dev.parent == &ici->dev) {
|
|
device_unregister(&icd->dev);
|
|
/* Not before device_unregister(), .remove
|
|
* needs parent to call ici->ops->remove() */
|
|
icd->dev.parent = NULL;
|
|
memset(&icd->dev.kobj, 0, sizeof(icd->dev.kobj));
|
|
}
|
|
}
|
|
|
|
mutex_unlock(&list_lock);
|
|
|
|
device_unregister(&ici->dev);
|
|
}
|
|
EXPORT_SYMBOL(soc_camera_host_unregister);
|
|
|
|
/* Image capture device */
|
|
int soc_camera_device_register(struct soc_camera_device *icd)
|
|
{
|
|
struct soc_camera_device *ix;
|
|
int num = -1, i;
|
|
|
|
if (!icd)
|
|
return -EINVAL;
|
|
|
|
for (i = 0; i < 256 && num < 0; i++) {
|
|
num = i;
|
|
list_for_each_entry(ix, &devices, list) {
|
|
if (ix->iface == icd->iface && ix->devnum == i) {
|
|
num = -1;
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
|
|
if (num < 0)
|
|
/* ok, we have 256 cameras on this host...
|
|
* man, stay reasonable... */
|
|
return -ENOMEM;
|
|
|
|
icd->devnum = num;
|
|
icd->dev.bus = &soc_camera_bus_type;
|
|
dev_set_name(&icd->dev, "%u-%u", icd->iface, icd->devnum);
|
|
|
|
icd->dev.release = dummy_release;
|
|
|
|
return scan_add_device(icd);
|
|
}
|
|
EXPORT_SYMBOL(soc_camera_device_register);
|
|
|
|
void soc_camera_device_unregister(struct soc_camera_device *icd)
|
|
{
|
|
mutex_lock(&list_lock);
|
|
list_del(&icd->list);
|
|
|
|
/* The bus->remove will be eventually called */
|
|
if (icd->dev.parent)
|
|
device_unregister(&icd->dev);
|
|
mutex_unlock(&list_lock);
|
|
}
|
|
EXPORT_SYMBOL(soc_camera_device_unregister);
|
|
|
|
static const struct v4l2_ioctl_ops soc_camera_ioctl_ops = {
|
|
.vidioc_querycap = soc_camera_querycap,
|
|
.vidioc_g_fmt_vid_cap = soc_camera_g_fmt_vid_cap,
|
|
.vidioc_enum_fmt_vid_cap = soc_camera_enum_fmt_vid_cap,
|
|
.vidioc_s_fmt_vid_cap = soc_camera_s_fmt_vid_cap,
|
|
.vidioc_enum_input = soc_camera_enum_input,
|
|
.vidioc_g_input = soc_camera_g_input,
|
|
.vidioc_s_input = soc_camera_s_input,
|
|
.vidioc_s_std = soc_camera_s_std,
|
|
.vidioc_reqbufs = soc_camera_reqbufs,
|
|
.vidioc_try_fmt_vid_cap = soc_camera_try_fmt_vid_cap,
|
|
.vidioc_querybuf = soc_camera_querybuf,
|
|
.vidioc_qbuf = soc_camera_qbuf,
|
|
.vidioc_dqbuf = soc_camera_dqbuf,
|
|
.vidioc_streamon = soc_camera_streamon,
|
|
.vidioc_streamoff = soc_camera_streamoff,
|
|
.vidioc_queryctrl = soc_camera_queryctrl,
|
|
.vidioc_g_ctrl = soc_camera_g_ctrl,
|
|
.vidioc_s_ctrl = soc_camera_s_ctrl,
|
|
.vidioc_cropcap = soc_camera_cropcap,
|
|
.vidioc_g_crop = soc_camera_g_crop,
|
|
.vidioc_s_crop = soc_camera_s_crop,
|
|
.vidioc_g_chip_ident = soc_camera_g_chip_ident,
|
|
#ifdef CONFIG_VIDEO_ADV_DEBUG
|
|
.vidioc_g_register = soc_camera_g_register,
|
|
.vidioc_s_register = soc_camera_s_register,
|
|
#endif
|
|
};
|
|
|
|
int soc_camera_video_start(struct soc_camera_device *icd)
|
|
{
|
|
struct soc_camera_host *ici = to_soc_camera_host(icd->dev.parent);
|
|
int err = -ENOMEM;
|
|
struct video_device *vdev;
|
|
|
|
if (!icd->dev.parent)
|
|
return -ENODEV;
|
|
|
|
vdev = video_device_alloc();
|
|
if (!vdev)
|
|
goto evidallocd;
|
|
dev_dbg(&ici->dev, "Allocated video_device %p\n", vdev);
|
|
|
|
strlcpy(vdev->name, ici->drv_name, sizeof(vdev->name));
|
|
/* Maybe better &ici->dev */
|
|
vdev->parent = &icd->dev;
|
|
vdev->current_norm = V4L2_STD_UNKNOWN;
|
|
vdev->fops = &soc_camera_fops;
|
|
vdev->ioctl_ops = &soc_camera_ioctl_ops;
|
|
vdev->release = video_device_release;
|
|
vdev->minor = -1;
|
|
vdev->tvnorms = V4L2_STD_UNKNOWN,
|
|
|
|
icd->current_fmt = &icd->formats[0];
|
|
|
|
err = video_register_device(vdev, VFL_TYPE_GRABBER, vdev->minor);
|
|
if (err < 0) {
|
|
dev_err(vdev->parent, "video_register_device failed\n");
|
|
goto evidregd;
|
|
}
|
|
icd->vdev = vdev;
|
|
|
|
return 0;
|
|
|
|
evidregd:
|
|
video_device_release(vdev);
|
|
evidallocd:
|
|
return err;
|
|
}
|
|
EXPORT_SYMBOL(soc_camera_video_start);
|
|
|
|
void soc_camera_video_stop(struct soc_camera_device *icd)
|
|
{
|
|
struct video_device *vdev = icd->vdev;
|
|
|
|
dev_dbg(&icd->dev, "%s\n", __func__);
|
|
|
|
if (!icd->dev.parent || !vdev)
|
|
return;
|
|
|
|
mutex_lock(&video_lock);
|
|
video_unregister_device(vdev);
|
|
icd->vdev = NULL;
|
|
mutex_unlock(&video_lock);
|
|
}
|
|
EXPORT_SYMBOL(soc_camera_video_stop);
|
|
|
|
static int __init soc_camera_init(void)
|
|
{
|
|
int ret = bus_register(&soc_camera_bus_type);
|
|
if (ret)
|
|
return ret;
|
|
ret = driver_register(&ic_drv);
|
|
if (ret)
|
|
goto edrvr;
|
|
|
|
return 0;
|
|
|
|
edrvr:
|
|
bus_unregister(&soc_camera_bus_type);
|
|
return ret;
|
|
}
|
|
|
|
static void __exit soc_camera_exit(void)
|
|
{
|
|
driver_unregister(&ic_drv);
|
|
bus_unregister(&soc_camera_bus_type);
|
|
}
|
|
|
|
module_init(soc_camera_init);
|
|
module_exit(soc_camera_exit);
|
|
|
|
MODULE_DESCRIPTION("Image capture bus driver");
|
|
MODULE_AUTHOR("Guennadi Liakhovetski <kernel@pengutronix.de>");
|
|
MODULE_LICENSE("GPL");
|