Release 4.11 drivers/staging/most/aim-v4l2/video.c
/*
* V4L2 AIM - V4L2 Application Interface Module for MostCore
*
* Copyright (C) 2015, Microchip Technology Germany II GmbH & Co. KG
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* This file is licensed under GPLv2.
*/
#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
#include <linux/module.h>
#include <linux/slab.h>
#include <linux/init.h>
#include <linux/device.h>
#include <linux/suspend.h>
#include <linux/videodev2.h>
#include <linux/mutex.h>
#include <media/v4l2-common.h>
#include <media/v4l2-ioctl.h>
#include <media/v4l2-event.h>
#include <media/v4l2-device.h>
#include <media/v4l2-ctrls.h>
#include <media/v4l2-fh.h>
#include "mostcore.h"
#define V4L2_AIM_MAX_INPUT 1
static struct most_aim aim_info;
struct most_video_dev {
struct most_interface *iface;
int ch_idx;
struct list_head list;
bool mute;
struct list_head pending_mbos;
spinlock_t list_lock;
struct v4l2_device v4l2_dev;
atomic_t access_ref;
struct video_device *vdev;
unsigned int ctrl_input;
struct mutex lock;
wait_queue_head_t wait_data;
};
struct aim_fh {
/* must be the first field of this struct! */
struct v4l2_fh fh;
struct most_video_dev *mdev;
u32 offs;
};
static struct list_head video_devices = LIST_HEAD_INIT(video_devices);
static struct spinlock list_lock;
static inline bool data_ready(struct most_video_dev *mdev)
{
return !list_empty(&mdev->pending_mbos);
}
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static inline struct mbo *get_top_mbo(struct most_video_dev *mdev)
{
return list_first_entry(&mdev->pending_mbos, struct mbo, list);
}
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static int aim_vdev_open(struct file *filp)
{
int ret;
struct video_device *vdev = video_devdata(filp);
struct most_video_dev *mdev = video_drvdata(filp);
struct aim_fh *fh;
v4l2_info(&mdev->v4l2_dev, "aim_vdev_open()\n");
switch (vdev->vfl_type) {
case VFL_TYPE_GRABBER:
break;
default:
return -EINVAL;
}
fh = kzalloc(sizeof(*fh), GFP_KERNEL);
if (!fh)
return -ENOMEM;
if (!atomic_inc_and_test(&mdev->access_ref)) {
v4l2_err(&mdev->v4l2_dev, "too many clients\n");
ret = -EBUSY;
goto err_dec;
}
fh->mdev = mdev;
v4l2_fh_init(&fh->fh, vdev);
filp->private_data = fh;
v4l2_fh_add(&fh->fh);
ret = most_start_channel(mdev->iface, mdev->ch_idx, &aim_info);
if (ret) {
v4l2_err(&mdev->v4l2_dev, "most_start_channel() failed\n");
goto err_rm;
}
return 0;
err_rm:
v4l2_fh_del(&fh->fh);
v4l2_fh_exit(&fh->fh);
err_dec:
atomic_dec(&mdev->access_ref);
kfree(fh);
return ret;
}
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static int aim_vdev_close(struct file *filp)
{
struct aim_fh *fh = filp->private_data;
struct most_video_dev *mdev = fh->mdev;
struct mbo *mbo, *tmp;
v4l2_info(&mdev->v4l2_dev, "aim_vdev_close()\n");
/*
* We need to put MBOs back before we call most_stop_channel()
* to deallocate MBOs.
* From the other hand mostcore still calling rx_completion()
* to deliver MBOs until most_stop_channel() is called.
* Use mute to work around this issue.
* This must be implemented in core.
*/
spin_lock_irq(&mdev->list_lock);
mdev->mute = true;
list_for_each_entry_safe(mbo, tmp, &mdev->pending_mbos, list) {
list_del(&mbo->list);
spin_unlock_irq(&mdev->list_lock);
most_put_mbo(mbo);
spin_lock_irq(&mdev->list_lock);
}
spin_unlock_irq(&mdev->list_lock);
most_stop_channel(mdev->iface, mdev->ch_idx, &aim_info);
mdev->mute = false;
v4l2_fh_del(&fh->fh);
v4l2_fh_exit(&fh->fh);
atomic_dec(&mdev->access_ref);
kfree(fh);
return 0;
}
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static ssize_t aim_vdev_read(struct file *filp, char __user *buf,
size_t count, loff_t *pos)
{
struct aim_fh *fh = filp->private_data;
struct most_video_dev *mdev = fh->mdev;
int ret = 0;
if (*pos)
return -ESPIPE;
if (!mdev)
return -ENODEV;
/* wait for the first buffer */
if (!(filp->f_flags & O_NONBLOCK)) {
if (wait_event_interruptible(mdev->wait_data, data_ready(mdev)))
return -ERESTARTSYS;
}
if (!data_ready(mdev))
return -EAGAIN;
while (count > 0 && data_ready(mdev)) {
struct mbo *const mbo = get_top_mbo(mdev);
int const rem = mbo->processed_length - fh->offs;
int const cnt = rem < count ? rem : count;
if (copy_to_user(buf, mbo->virt_address + fh->offs, cnt)) {
v4l2_err(&mdev->v4l2_dev, "read: copy_to_user failed\n");
if (!ret)
ret = -EFAULT;
return ret;
}
fh->offs += cnt;
count -= cnt;
buf += cnt;
ret += cnt;
if (cnt >= rem) {
fh->offs = 0;
spin_lock_irq(&mdev->list_lock);
list_del(&mbo->list);
spin_unlock_irq(&mdev->list_lock);
most_put_mbo(mbo);
}
}
return ret;
}
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static unsigned int aim_vdev_poll(struct file *filp, poll_table *wait)
{
struct aim_fh *fh = filp->private_data;
struct most_video_dev *mdev = fh->mdev;
unsigned int mask = 0;
/* only wait if no data is available */
if (!data_ready(mdev))
poll_wait(filp, &mdev->wait_data, wait);
if (data_ready(mdev))
mask |= POLLIN | POLLRDNORM;
return mask;
}
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static void aim_set_format_struct(struct v4l2_format *f)
{
f->fmt.pix.width = 8;
f->fmt.pix.height = 8;
f->fmt.pix.pixelformat = V4L2_PIX_FMT_MPEG;
f->fmt.pix.bytesperline = 0;
f->fmt.pix.sizeimage = 188 * 2;
f->fmt.pix.colorspace = V4L2_COLORSPACE_REC709;
f->fmt.pix.field = V4L2_FIELD_NONE;
f->fmt.pix.priv = 0;
}
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static int aim_set_format(struct most_video_dev *mdev, unsigned int cmd,
struct v4l2_format *format)
{
if (format->fmt.pix.pixelformat != V4L2_PIX_FMT_MPEG)
return -EINVAL;
if (cmd == VIDIOC_TRY_FMT)
return 0;
aim_set_format_struct(format);
return 0;
}
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static int vidioc_querycap(struct file *file, void *priv,
struct v4l2_capability *cap)
{
struct aim_fh *fh = priv;
struct most_video_dev *mdev = fh->mdev;
v4l2_info(&mdev->v4l2_dev, "vidioc_querycap()\n");
strlcpy(cap->driver, "v4l2_most_aim", sizeof(cap->driver));
strlcpy(cap->card, "MOST", sizeof(cap->card));
snprintf(cap->bus_info, sizeof(cap->bus_info),
"%s", mdev->iface->description);
cap->capabilities =
V4L2_CAP_READWRITE |
V4L2_CAP_TUNER |
V4L2_CAP_VIDEO_CAPTURE;
return 0;
}
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static int vidioc_enum_fmt_vid_cap(struct file *file, void *priv,
struct v4l2_fmtdesc *f)
{
struct aim_fh *fh = priv;
struct most_video_dev *mdev = fh->mdev;
v4l2_info(&mdev->v4l2_dev, "vidioc_enum_fmt_vid_cap() %d\n", f->index);
if (f->index)
return -EINVAL;
strcpy(f->description, "MPEG");
f->type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
f->flags = V4L2_FMT_FLAG_COMPRESSED;
f->pixelformat = V4L2_PIX_FMT_MPEG;
return 0;
}
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static int vidioc_g_fmt_vid_cap(struct file *file, void *priv,
struct v4l2_format *f)
{
struct aim_fh *fh = priv;
struct most_video_dev *mdev = fh->mdev;
v4l2_info(&mdev->v4l2_dev, "vidioc_g_fmt_vid_cap()\n");
aim_set_format_struct(f);
return 0;
}
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static int vidioc_try_fmt_vid_cap(struct file *file, void *priv,
struct v4l2_format *f)
{
struct aim_fh *fh = priv;
struct most_video_dev *mdev = fh->mdev;
return aim_set_format(mdev, VIDIOC_TRY_FMT, f);
}
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static int vidioc_s_fmt_vid_cap(struct file *file, void *priv,
struct v4l2_format *f)
{
struct aim_fh *fh = priv;
struct most_video_dev *mdev = fh->mdev;
return aim_set_format(mdev, VIDIOC_S_FMT, f);
}
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static int vidioc_g_std(struct file *file, void *priv, v4l2_std_id *norm)
{
struct aim_fh *fh = priv;
struct most_video_dev *mdev = fh->mdev;
v4l2_info(&mdev->v4l2_dev, "vidioc_g_std()\n");
*norm = V4L2_STD_UNKNOWN;
return 0;
}
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static int vidioc_enum_input(struct file *file, void *priv,
struct v4l2_input *input)
{
struct aim_fh *fh = priv;
struct most_video_dev *mdev = fh->mdev;
if (input->index >= V4L2_AIM_MAX_INPUT)
return -EINVAL;
strcpy(input->name, "MOST Video");
input->type |= V4L2_INPUT_TYPE_CAMERA;
input->audioset = 0;
input->std = mdev->vdev->tvnorms;
return 0;
}
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static int vidioc_g_input(struct file *file, void *priv, unsigned int *i)
{
struct aim_fh *fh = priv;
struct most_video_dev *mdev = fh->mdev;
*i = mdev->ctrl_input;
return 0;
}
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static int vidioc_s_input(struct file *file, void *priv, unsigned int index)
{
struct aim_fh *fh = priv;
struct most_video_dev *mdev = fh->mdev;
v4l2_info(&mdev->v4l2_dev, "vidioc_s_input(%d)\n", index);
if (index >= V4L2_AIM_MAX_INPUT)
return -EINVAL;
mdev->ctrl_input = index;
return 0;
}
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static const struct v4l2_file_operations aim_fops = {
.owner = THIS_MODULE,
.open = aim_vdev_open,
.release = aim_vdev_close,
.read = aim_vdev_read,
.poll = aim_vdev_poll,
.unlocked_ioctl = video_ioctl2,
};
static const struct v4l2_ioctl_ops video_ioctl_ops = {
.vidioc_querycap = vidioc_querycap,
.vidioc_enum_fmt_vid_cap = vidioc_enum_fmt_vid_cap,
.vidioc_g_fmt_vid_cap = vidioc_g_fmt_vid_cap,
.vidioc_try_fmt_vid_cap = vidioc_try_fmt_vid_cap,
.vidioc_s_fmt_vid_cap = vidioc_s_fmt_vid_cap,
.vidioc_g_std = vidioc_g_std,
.vidioc_enum_input = vidioc_enum_input,
.vidioc_g_input = vidioc_g_input,
.vidioc_s_input = vidioc_s_input,
};
static const struct video_device aim_videodev_template = {
.fops = &aim_fops,
.release = video_device_release,
.ioctl_ops = &video_ioctl_ops,
.tvnorms = V4L2_STD_UNKNOWN,
};
/**************************************************************************/
static struct most_video_dev *get_aim_dev(
struct most_interface *iface, int channel_idx)
{
struct most_video_dev *mdev;
unsigned long flags;
spin_lock_irqsave(&list_lock, flags);
list_for_each_entry(mdev, &video_devices, list) {
if (mdev->iface == iface && mdev->ch_idx == channel_idx) {
spin_unlock_irqrestore(&list_lock, flags);
return mdev;
}
}
spin_unlock_irqrestore(&list_lock, flags);
return NULL;
}
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static int aim_rx_data(struct mbo *mbo)
{
unsigned long flags;
struct most_video_dev *mdev =
get_aim_dev(mbo->ifp, mbo->hdm_channel_id);
if (!mdev)
return -EIO;
spin_lock_irqsave(&mdev->list_lock, flags);
if (unlikely(mdev->mute)) {
spin_unlock_irqrestore(&mdev->list_lock, flags);
return -EIO;
}
list_add_tail(&mbo->list, &mdev->pending_mbos);
spin_unlock_irqrestore(&mdev->list_lock, flags);
wake_up_interruptible(&mdev->wait_data);
return 0;
}
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static int aim_register_videodev(struct most_video_dev *mdev)
{
int ret;
v4l2_info(&mdev->v4l2_dev, "aim_register_videodev()\n");
init_waitqueue_head(&mdev->wait_data);
/* allocate and fill v4l2 video struct */
mdev->vdev = video_device_alloc();
if (!mdev->vdev)
return -ENOMEM;
/* Fill the video capture device struct */
*mdev->vdev = aim_videodev_template;
mdev->vdev->v4l2_dev = &mdev->v4l2_dev;
mdev->vdev->lock = &mdev->lock;
snprintf(mdev->vdev->name, sizeof(mdev->vdev->name), "MOST: %s",
mdev->v4l2_dev.name);
/* Register the v4l2 device */
video_set_drvdata(mdev->vdev, mdev);
ret = video_register_device(mdev->vdev, VFL_TYPE_GRABBER, -1);
if (ret) {
v4l2_err(&mdev->v4l2_dev, "video_register_device failed (%d)\n",
ret);
video_device_release(mdev->vdev);
}
return ret;
}
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static void aim_unregister_videodev(struct most_video_dev *mdev)
{
v4l2_info(&mdev->v4l2_dev, "aim_unregister_videodev()\n");
video_unregister_device(mdev->vdev);
}
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static void aim_v4l2_dev_release(struct v4l2_device *v4l2_dev)
{
struct most_video_dev *mdev =
container_of(v4l2_dev, struct most_video_dev, v4l2_dev);
v4l2_device_unregister(v4l2_dev);
kfree(mdev);
}
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static int aim_probe_channel(struct most_interface *iface, int channel_idx,
struct most_channel_config *ccfg,
struct kobject *parent, char *name)
{
int ret;
struct most_video_dev *mdev = get_aim_dev(iface, channel_idx);
pr_info("aim_probe_channel(%s)\n", name);
if (mdev) {
pr_err("channel already linked\n");
return -EEXIST;
}
if (ccfg->direction != MOST_CH_RX) {
pr_err("wrong direction, expect rx\n");
return -EINVAL;
}
if (ccfg->data_type != MOST_CH_SYNC &&
ccfg->data_type != MOST_CH_ISOC) {
pr_err("wrong channel type, expect sync or isoc\n");
return -EINVAL;
}
mdev = kzalloc(sizeof(*mdev), GFP_KERNEL);
if (!mdev)
return -ENOMEM;
mutex_init(&mdev->lock);
atomic_set(&mdev->access_ref, -1);
spin_lock_init(&mdev->list_lock);
INIT_LIST_HEAD(&mdev->pending_mbos);
mdev->iface = iface;
mdev->ch_idx = channel_idx;
mdev->v4l2_dev.release = aim_v4l2_dev_release;
/* Create the v4l2_device */
strlcpy(mdev->v4l2_dev.name, name, sizeof(mdev->v4l2_dev.name));
ret = v4l2_device_register(NULL, &mdev->v4l2_dev);
if (ret) {
pr_err("v4l2_device_register() failed\n");
kfree(mdev);
return ret;
}
ret = aim_register_videodev(mdev);
if (ret)
goto err_unreg;
spin_lock_irq(&list_lock);
list_add(&mdev->list, &video_devices);
spin_unlock_irq(&list_lock);
v4l2_info(&mdev->v4l2_dev, "aim_probe_channel() done\n");
return 0;
err_unreg:
v4l2_device_disconnect(&mdev->v4l2_dev);
v4l2_device_put(&mdev->v4l2_dev);
return ret;
}
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| Total | 309 | 100.00% | 6 | 100.00% |
static int aim_disconnect_channel(struct most_interface *iface,
int channel_idx)
{
struct most_video_dev *mdev = get_aim_dev(iface, channel_idx);
if (!mdev) {
pr_err("no such channel is linked\n");
return -ENOENT;
}
v4l2_info(&mdev->v4l2_dev, "aim_disconnect_channel()\n");
spin_lock_irq(&list_lock);
list_del(&mdev->list);
spin_unlock_irq(&list_lock);
aim_unregister_videodev(mdev);
v4l2_device_disconnect(&mdev->v4l2_dev);
v4l2_device_put(&mdev->v4l2_dev);
return 0;
}
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| Total | 96 | 100.00% | 3 | 100.00% |
static struct most_aim aim_info = {
.name = "v4l",
.probe_channel = aim_probe_channel,
.disconnect_channel = aim_disconnect_channel,
.rx_completion = aim_rx_data,
};
static int __init aim_init(void)
{
spin_lock_init(&list_lock);
return most_register_aim(&aim_info);
}
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static void __exit aim_exit(void)
{
struct most_video_dev *mdev, *tmp;
/*
* As the mostcore currently doesn't call disconnect_channel()
* for linked channels while we call most_deregister_aim()
* we simulate this call here.
* This must be fixed in core.
*/
spin_lock_irq(&list_lock);
list_for_each_entry_safe(mdev, tmp, &video_devices, list) {
list_del(&mdev->list);
spin_unlock_irq(&list_lock);
aim_unregister_videodev(mdev);
v4l2_device_disconnect(&mdev->v4l2_dev);
v4l2_device_put(&mdev->v4l2_dev);
spin_lock_irq(&list_lock);
}
spin_unlock_irq(&list_lock);
most_deregister_aim(&aim_info);
BUG_ON(!list_empty(&video_devices));
}
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module_init(aim_init);
module_exit(aim_exit);
MODULE_DESCRIPTION("V4L2 Application Interface Module for MostCore");
MODULE_AUTHOR("Andrey Shvetsov <andrey.shvetsov@k2l.de>");
MODULE_LICENSE("GPL");
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| Christian Gromm | 2769 | 99.89% | 12 | 80.00% |
| Bhumika Goyal | 1 | 0.04% | 1 | 6.67% |
| Andrey Shvetsov | 1 | 0.04% | 1 | 6.67% |
| Sudip Mukherjee | 1 | 0.04% | 1 | 6.67% |
| Total | 2772 | 100.00% | 15 | 100.00% |
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