V4L/DVB (7170): soc_camera V4L2 driver for directly-connected SoC-based cameras
This driver provides an interface between platform-specific camera busses and camera devices. It should be used if the camera is connected not over a "proper" bus like PCI or USB, but over a special bus, like, for example, the Quick Capture interface on PXA270 SoCs. Later it should also be used for i.MX31 SoCs from Freescale. It can handle multiple cameras and / or multiple busses, which can be used, e.g., in stereo-vision applications. Signed-off-by: Guennadi Liakhovetski <g.liakhovetski@pengutronix.de> Signed-off-by: Mauro Carvalho Chehab <mchehab@infradead.org>
This commit is contained in:
Guennadi Liakhovetski
Mauro Carvalho Chehab
parent
a7c7402f68
commit
e55222ef27
@ -836,4 +836,13 @@ config USB_STKWEBCAM
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endif # V4L_USB_DRIVERS
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config SOC_CAMERA
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tristate "SoC camera support"
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depends on VIDEO_V4L2
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select VIDEOBUF_DMA_SG
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help
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SoC Camera is a common API to several cameras, not connecting
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over a bus like PCI or USB. For example some i2c camera connected
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directly to the data bus of an SoC.
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endif # VIDEO_CAPTURE_DRIVERS
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@ -136,5 +136,7 @@ obj-$(CONFIG_VIDEO_IVTV) += ivtv/
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obj-$(CONFIG_VIDEO_VIVI) += vivi.o
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obj-$(CONFIG_VIDEO_CX23885) += cx23885/
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obj-$(CONFIG_SOC_CAMERA) += soc_camera.o
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EXTRA_CFLAGS += -Idrivers/media/dvb/dvb-core
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EXTRA_CFLAGS += -Idrivers/media/dvb/frontends
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973
drivers/media/video/soc_camera.c
Normal file
973
drivers/media/video/soc_camera.c
Normal file
@ -0,0 +1,973 @@
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/*
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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-dev.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 static struct soc_camera_data_format*
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format_by_fourcc(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->ops->num_formats; i++)
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if (icd->ops->formats[i].fourcc == fourcc)
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return icd->ops->formats + i;
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return NULL;
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}
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static int soc_camera_try_fmt_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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const struct soc_camera_data_format *fmt;
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int ret;
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WARN_ON(priv != file->private_data);
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fmt = format_by_fourcc(icd, f->fmt.pix.pixelformat);
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if (!fmt) {
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dev_dbg(&icd->dev, "invalid format 0x%08x\n",
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f->fmt.pix.pixelformat);
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return -EINVAL;
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}
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dev_dbg(&icd->dev, "fmt: 0x%08x\n", fmt->fourcc);
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field = f->fmt.pix.field;
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if (field == V4L2_FIELD_ANY) {
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field = V4L2_FIELD_NONE;
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} else if (V4L2_FIELD_NONE != field) {
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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 to host capabilities */
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ret = ici->try_fmt_cap(ici, f);
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/* limit to sensor capabilities */
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if (!ret)
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ret = icd->ops->try_fmt_cap(icd, f);
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/* calculate missing fields */
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f->fmt.pix.field = field;
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f->fmt.pix.bytesperline =
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(f->fmt.pix.width * fmt->depth) >> 3;
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f->fmt.pix.sizeimage =
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f->fmt.pix.height * f->fmt.pix.bytesperline;
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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", __FUNCTION__, 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->reqbufs(icf, p);
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return ret;
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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 = video_devdata(file);
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struct soc_camera_device *icd = container_of(vdev->dev,
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struct soc_camera_device, dev);
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struct soc_camera_host *ici =
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to_soc_camera_host(icd->dev.parent);
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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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icf->icd = icd;
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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->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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file->private_data = icf;
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dev_dbg(&icd->dev, "camera device open\n");
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/* We must pass NULL as dev pointer, then all pci_* dma operations
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* transform to normal dma_* ones. Do we need an irqlock? */
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videobuf_queue_pci_init(&icf->vb_vidq, ici->vbq_ops, NULL, NULL,
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V4L2_BUF_TYPE_VIDEO_CAPTURE, V4L2_FIELD_NONE,
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ici->msize, icd);
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return 0;
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emgi:
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module_put(icd->ops->owner);
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emgd:
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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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module_put(icd->ops->owner);
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module_put(ici->owner);
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vfree(file->private_data);
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dev_dbg(vdev->dev, "camera device close\n");
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return 0;
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}
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static int 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->dev, "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->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_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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const static struct soc_camera_data_format *data_fmt;
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WARN_ON(priv != file->private_data);
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data_fmt = format_by_fourcc(icd, f->fmt.pix.pixelformat);
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if (!data_fmt)
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return -EINVAL;
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/* cached_datawidth may be further adjusted by the ici */
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icd->cached_datawidth = data_fmt->depth;
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ret = soc_camera_try_fmt_cap(file, icf, 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->set_capture_format(icd, f->fmt.pix.pixelformat, &rect);
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if (!ret) {
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icd->current_fmt = data_fmt;
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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 (V4L2_BUF_TYPE_VIDEO_CAPTURE != f->type)
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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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}
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return ret;
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}
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static int soc_camera_enum_fmt_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->ops->num_formats)
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return -EINVAL;
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format = &icd->ops->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_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 =
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(f->fmt.pix.width * icd->current_fmt->depth) >> 3;
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f->fmt.pix.sizeimage =
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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->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", __FUNCTION__);
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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", __FUNCTION__);
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if (i != V4L2_BUF_TYPE_VIDEO_CAPTURE)
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return -EINVAL;
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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);
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
static int soc_camera_queryctrl(struct file *file, void *priv,
|
||||
struct v4l2_queryctrl *qc)
|
||||
{
|
||||
struct soc_camera_file *icf = file->private_data;
|
||||
struct soc_camera_device *icd = icf->icd;
|
||||
int i;
|
||||
|
||||
WARN_ON(priv != file->private_data);
|
||||
|
||||
if (!qc->id)
|
||||
return -EINVAL;
|
||||
|
||||
for (i = 0; i < icd->ops->num_controls; i++)
|
||||
if (qc->id == icd->ops->controls[i].id) {
|
||||
memcpy(qc, &(icd->ops->controls[i]),
|
||||
sizeof(*qc));
|
||||
return 0;
|
||||
}
|
||||
|
||||
return -EINVAL;
|
||||
}
|
||||
|
||||
static int soc_camera_g_ctrl(struct file *file, void *priv,
|
||||
struct v4l2_control *ctrl)
|
||||
{
|
||||
struct soc_camera_file *icf = file->private_data;
|
||||
struct soc_camera_device *icd = icf->icd;
|
||||
|
||||
WARN_ON(priv != file->private_data);
|
||||
|
||||
switch (ctrl->id) {
|
||||
case V4L2_CID_GAIN:
|
||||
if (icd->gain == (unsigned short)~0)
|
||||
return -EINVAL;
|
||||
ctrl->value = icd->gain;
|
||||
return 0;
|
||||
case V4L2_CID_EXPOSURE:
|
||||
if (icd->exposure == (unsigned short)~0)
|
||||
return -EINVAL;
|
||||
ctrl->value = icd->exposure;
|
||||
return 0;
|
||||
}
|
||||
|
||||
if (icd->ops->get_control)
|
||||
return icd->ops->get_control(icd, ctrl);
|
||||
return -EINVAL;
|
||||
}
|
||||
|
||||
static int soc_camera_s_ctrl(struct file *file, void *priv,
|
||||
struct v4l2_control *ctrl)
|
||||
{
|
||||
struct soc_camera_file *icf = file->private_data;
|
||||
struct soc_camera_device *icd = icf->icd;
|
||||
|
||||
WARN_ON(priv != file->private_data);
|
||||
|
||||
if (icd->ops->set_control)
|
||||
return icd->ops->set_control(icd, ctrl);
|
||||
return -EINVAL;
|
||||
}
|
||||
|
||||
static int soc_camera_cropcap(struct file *file, void *fh,
|
||||
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->set_capture_format(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->probe)
|
||||
return -ENODEV;
|
||||
|
||||
ret = ici->add(icd);
|
||||
if (ret < 0)
|
||||
return ret;
|
||||
|
||||
ret = icd->probe(icd);
|
||||
if (ret < 0)
|
||||
ici->remove(icd);
|
||||
else {
|
||||
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;
|
||||
}
|
||||
|
||||
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);
|
||||
struct soc_camera_host *ici =
|
||||
to_soc_camera_host(icd->dev.parent);
|
||||
|
||||
if (icd->remove)
|
||||
icd->remove(icd);
|
||||
|
||||
ici->remove(icd);
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
static struct bus_type soc_camera_bus_type = {
|
||||
.name = "soc-camera",
|
||||
.probe = soc_camera_probe,
|
||||
.remove = soc_camera_remove,
|
||||
};
|
||||
|
||||
static struct device_driver ic_drv = {
|
||||
.name = "camera",
|
||||
.bus = &soc_camera_bus_type,
|
||||
.owner = THIS_MODULE,
|
||||
};
|
||||
|
||||
/*
|
||||
* Image capture host - this is a host device, not a bus device, so,
|
||||
* no bus reference, no probing.
|
||||
*/
|
||||
static struct class soc_camera_host_class = {
|
||||
.owner = THIS_MODULE,
|
||||
.name = "camera_host",
|
||||
};
|
||||
|
||||
static void dummy_release(struct device *dev)
|
||||
{
|
||||
}
|
||||
|
||||
int soc_camera_host_register(struct soc_camera_host *ici, struct module *owner)
|
||||
{
|
||||
int ret;
|
||||
struct soc_camera_host *ix;
|
||||
|
||||
if (!ici->vbq_ops || !ici->add || !ici->remove || !owner)
|
||||
return -EINVAL;
|
||||
|
||||
/* Number might be equal to the platform device ID */
|
||||
sprintf(ici->dev.bus_id, "camera_host%d", ici->nr);
|
||||
ici->dev.class = &soc_camera_host_class;
|
||||
|
||||
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->owner = owner;
|
||||
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->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;
|
||||
snprintf(icd->dev.bus_id, sizeof(icd->dev.bus_id),
|
||||
"%u-%u", icd->iface, icd->devnum);
|
||||
|
||||
icd->dev.release = dummy_release;
|
||||
|
||||
if (icd->ops->get_datawidth)
|
||||
icd->cached_datawidth = icd->ops->get_datawidth(icd);
|
||||
|
||||
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);
|
||||
|
||||
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->dev = &icd->dev;
|
||||
vdev->type = VID_TYPE_CAPTURE;
|
||||
vdev->current_norm = V4L2_STD_UNKNOWN;
|
||||
vdev->fops = &soc_camera_fops;
|
||||
vdev->release = video_device_release;
|
||||
vdev->minor = -1;
|
||||
vdev->tvnorms = V4L2_STD_UNKNOWN,
|
||||
vdev->vidioc_querycap = soc_camera_querycap;
|
||||
vdev->vidioc_g_fmt_cap = soc_camera_g_fmt_cap;
|
||||
vdev->vidioc_enum_fmt_cap = soc_camera_enum_fmt_cap;
|
||||
vdev->vidioc_s_fmt_cap = soc_camera_s_fmt_cap;
|
||||
vdev->vidioc_enum_input = soc_camera_enum_input;
|
||||
vdev->vidioc_g_input = soc_camera_g_input;
|
||||
vdev->vidioc_s_input = soc_camera_s_input;
|
||||
vdev->vidioc_s_std = soc_camera_s_std;
|
||||
vdev->vidioc_reqbufs = soc_camera_reqbufs;
|
||||
vdev->vidioc_try_fmt_cap = soc_camera_try_fmt_cap;
|
||||
vdev->vidioc_querybuf = soc_camera_querybuf;
|
||||
vdev->vidioc_qbuf = soc_camera_qbuf;
|
||||
vdev->vidioc_dqbuf = soc_camera_dqbuf;
|
||||
vdev->vidioc_streamon = soc_camera_streamon;
|
||||
vdev->vidioc_streamoff = soc_camera_streamoff;
|
||||
vdev->vidioc_queryctrl = soc_camera_queryctrl;
|
||||
vdev->vidioc_g_ctrl = soc_camera_g_ctrl;
|
||||
vdev->vidioc_s_ctrl = soc_camera_s_ctrl;
|
||||
vdev->vidioc_cropcap = soc_camera_cropcap;
|
||||
vdev->vidioc_g_crop = soc_camera_g_crop;
|
||||
vdev->vidioc_s_crop = soc_camera_s_crop;
|
||||
vdev->vidioc_g_chip_ident = soc_camera_g_chip_ident;
|
||||
#ifdef CONFIG_VIDEO_ADV_DEBUG
|
||||
vdev->vidioc_g_register = soc_camera_g_register;
|
||||
vdev->vidioc_s_register = soc_camera_s_register;
|
||||
#endif
|
||||
|
||||
icd->current_fmt = &icd->ops->formats[0];
|
||||
|
||||
err = video_register_device(vdev, VFL_TYPE_GRABBER, vdev->minor);
|
||||
if (err < 0) {
|
||||
dev_err(vdev->dev, "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", __FUNCTION__);
|
||||
|
||||
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;
|
||||
ret = class_register(&soc_camera_host_class);
|
||||
if (ret)
|
||||
goto eclr;
|
||||
|
||||
return 0;
|
||||
|
||||
eclr:
|
||||
driver_unregister(&ic_drv);
|
||||
edrvr:
|
||||
bus_unregister(&soc_camera_bus_type);
|
||||
return ret;
|
||||
}
|
||||
|
||||
static void __exit soc_camera_exit(void)
|
||||
{
|
||||
class_unregister(&soc_camera_host_class);
|
||||
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");
|
||||
147
include/media/soc_camera.h
Normal file
147
include/media/soc_camera.h
Normal file
@ -0,0 +1,147 @@
|
||||
/*
|
||||
* camera image capture (abstract) bus driver header
|
||||
*
|
||||
* Copyright (C) 2006, Sascha Hauer, Pengutronix
|
||||
* Copyright (C) 2008, Guennadi Liakhovetski <kernel@pengutronix.de>
|
||||
*
|
||||
* This program is free software; you can redistribute it and/or modify
|
||||
* it under the terms of the GNU General Public License version 2 as
|
||||
* published by the Free Software Foundation.
|
||||
*/
|
||||
|
||||
#ifndef SOC_CAMERA_H
|
||||
#define SOC_CAMERA_H
|
||||
|
||||
#include <linux/videodev2.h>
|
||||
#include <media/videobuf-dma-sg.h>
|
||||
|
||||
struct soc_camera_device {
|
||||
struct list_head list;
|
||||
struct device dev;
|
||||
struct device *control;
|
||||
unsigned short width; /* Current window */
|
||||
unsigned short height; /* sizes */
|
||||
unsigned short x_min; /* Camera capabilities */
|
||||
unsigned short y_min;
|
||||
unsigned short x_current; /* Current window location */
|
||||
unsigned short y_current;
|
||||
unsigned short width_min;
|
||||
unsigned short width_max;
|
||||
unsigned short height_min;
|
||||
unsigned short height_max;
|
||||
unsigned short y_skip_top; /* Lines to skip at the top */
|
||||
unsigned short gain;
|
||||
unsigned short exposure;
|
||||
unsigned char iface; /* Host number */
|
||||
unsigned char devnum; /* Device number per host */
|
||||
unsigned char cached_datawidth; /* See comment in .c */
|
||||
struct soc_camera_ops *ops;
|
||||
struct video_device *vdev;
|
||||
const struct soc_camera_data_format *current_fmt;
|
||||
int (*probe)(struct soc_camera_device *icd);
|
||||
void (*remove)(struct soc_camera_device *icd);
|
||||
struct module *owner;
|
||||
};
|
||||
|
||||
struct soc_camera_file {
|
||||
struct soc_camera_device *icd;
|
||||
struct videobuf_queue vb_vidq;
|
||||
};
|
||||
|
||||
struct soc_camera_host {
|
||||
struct list_head list;
|
||||
struct device dev;
|
||||
unsigned char nr; /* Host number */
|
||||
size_t msize;
|
||||
struct videobuf_queue_ops *vbq_ops;
|
||||
struct module *owner;
|
||||
void *priv;
|
||||
char *drv_name;
|
||||
int (*add)(struct soc_camera_device *);
|
||||
void (*remove)(struct soc_camera_device *);
|
||||
int (*set_capture_format)(struct soc_camera_device *, __u32,
|
||||
struct v4l2_rect *);
|
||||
int (*try_fmt_cap)(struct soc_camera_host *, struct v4l2_format *);
|
||||
int (*reqbufs)(struct soc_camera_file *, struct v4l2_requestbuffers *);
|
||||
int (*querycap)(struct soc_camera_host *, struct v4l2_capability *);
|
||||
unsigned int (*poll)(struct file *, poll_table *);
|
||||
};
|
||||
|
||||
struct soc_camera_link {
|
||||
/* Camera bus id, used to match a camera and a bus */
|
||||
int bus_id;
|
||||
/* GPIO number to switch between 8 and 10 bit modes */
|
||||
unsigned int gpio;
|
||||
};
|
||||
|
||||
static inline struct soc_camera_device *to_soc_camera_dev(struct device *dev)
|
||||
{
|
||||
return container_of(dev, struct soc_camera_device, dev);
|
||||
}
|
||||
|
||||
static inline struct soc_camera_host *to_soc_camera_host(struct device *dev)
|
||||
{
|
||||
return container_of(dev, struct soc_camera_host, dev);
|
||||
}
|
||||
|
||||
extern int soc_camera_host_register(struct soc_camera_host *ici,
|
||||
struct module *owner);
|
||||
extern void soc_camera_host_unregister(struct soc_camera_host *ici);
|
||||
extern int soc_camera_device_register(struct soc_camera_device *icd);
|
||||
extern void soc_camera_device_unregister(struct soc_camera_device *icd);
|
||||
|
||||
extern int soc_camera_video_start(struct soc_camera_device *icd);
|
||||
extern void soc_camera_video_stop(struct soc_camera_device *icd);
|
||||
|
||||
struct soc_camera_data_format {
|
||||
char *name;
|
||||
unsigned int depth;
|
||||
__u32 fourcc;
|
||||
enum v4l2_colorspace colorspace;
|
||||
};
|
||||
|
||||
struct soc_camera_ops {
|
||||
struct module *owner;
|
||||
int (*init)(struct soc_camera_device *);
|
||||
int (*release)(struct soc_camera_device *);
|
||||
int (*start_capture)(struct soc_camera_device *);
|
||||
int (*stop_capture)(struct soc_camera_device *);
|
||||
int (*set_capture_format)(struct soc_camera_device *, __u32,
|
||||
struct v4l2_rect *, unsigned int);
|
||||
int (*try_fmt_cap)(struct soc_camera_device *, struct v4l2_format *);
|
||||
int (*get_chip_id)(struct soc_camera_device *,
|
||||
struct v4l2_chip_ident *);
|
||||
#ifdef CONFIG_VIDEO_ADV_DEBUG
|
||||
int (*get_register)(struct soc_camera_device *, struct v4l2_register *);
|
||||
int (*set_register)(struct soc_camera_device *, struct v4l2_register *);
|
||||
#endif
|
||||
const struct soc_camera_data_format *formats;
|
||||
int num_formats;
|
||||
int (*get_control)(struct soc_camera_device *, struct v4l2_control *);
|
||||
int (*set_control)(struct soc_camera_device *, struct v4l2_control *);
|
||||
const struct v4l2_queryctrl *controls;
|
||||
int num_controls;
|
||||
unsigned int(*get_datawidth)(struct soc_camera_device *icd);
|
||||
};
|
||||
|
||||
static inline struct v4l2_queryctrl const *soc_camera_find_qctrl(
|
||||
struct soc_camera_ops *ops, int id)
|
||||
{
|
||||
int i;
|
||||
|
||||
for (i = 0; i < ops->num_controls; i++)
|
||||
if (ops->controls[i].id == id)
|
||||
return &ops->controls[i];
|
||||
|
||||
return NULL;
|
||||
}
|
||||
|
||||
#define IS_MASTER (1<<0)
|
||||
#define IS_HSYNC_ACTIVE_HIGH (1<<1)
|
||||
#define IS_VSYNC_ACTIVE_HIGH (1<<2)
|
||||
#define IS_DATAWIDTH_8 (1<<3)
|
||||
#define IS_DATAWIDTH_9 (1<<4)
|
||||
#define IS_DATAWIDTH_10 (1<<5)
|
||||
#define IS_PCLK_SAMPLE_RISING (1<<6)
|
||||
|
||||
#endif
|
||||
Loading…
Reference in New Issue
Block a user