// SPDX-License-Identifier: GPL-2.0
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/*
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* video.c - V4L2 component for Mostcore
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*
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* Copyright (C) 2015, Microchip Technology Germany II GmbH & Co. KG
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*/
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#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
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#include <linux/module.h>
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#include <linux/slab.h>
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#include <linux/init.h>
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#include <linux/device.h>
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#include <linux/suspend.h>
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#include <linux/videodev2.h>
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#include <linux/mutex.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-event.h>
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#include <media/v4l2-device.h>
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#include <media/v4l2-ctrls.h>
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#include <media/v4l2-fh.h>
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#include "most/core.h"
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#define V4L2_CMP_MAX_INPUT 1
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static struct core_component comp;
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struct most_video_dev {
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struct most_interface *iface;
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int ch_idx;
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struct list_head list;
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bool mute;
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struct list_head pending_mbos;
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spinlock_t list_lock;
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struct v4l2_device v4l2_dev;
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atomic_t access_ref;
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struct video_device *vdev;
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unsigned int ctrl_input;
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struct mutex lock;
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wait_queue_head_t wait_data;
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};
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struct comp_fh {
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/* must be the first field of this struct! */
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struct v4l2_fh fh;
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struct most_video_dev *mdev;
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u32 offs;
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};
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static struct list_head video_devices = LIST_HEAD_INIT(video_devices);
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static struct spinlock list_lock;
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static inline bool data_ready(struct most_video_dev *mdev)
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{
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return !list_empty(&mdev->pending_mbos);
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}
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static inline struct mbo *get_top_mbo(struct most_video_dev *mdev)
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{
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return list_first_entry(&mdev->pending_mbos, struct mbo, list);
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}
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static int comp_vdev_open(struct file *filp)
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{
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int ret;
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struct video_device *vdev = video_devdata(filp);
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struct most_video_dev *mdev = video_drvdata(filp);
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struct comp_fh *fh;
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switch (vdev->vfl_type) {
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case VFL_TYPE_GRABBER:
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break;
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default:
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return -EINVAL;
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}
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fh = kzalloc(sizeof(*fh), GFP_KERNEL);
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if (!fh)
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return -ENOMEM;
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if (!atomic_inc_and_test(&mdev->access_ref)) {
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v4l2_err(&mdev->v4l2_dev, "too many clients\n");
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ret = -EBUSY;
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goto err_dec;
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}
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fh->mdev = mdev;
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v4l2_fh_init(&fh->fh, vdev);
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filp->private_data = fh;
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v4l2_fh_add(&fh->fh);
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ret = most_start_channel(mdev->iface, mdev->ch_idx, &comp);
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if (ret) {
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v4l2_err(&mdev->v4l2_dev, "most_start_channel() failed\n");
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goto err_rm;
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}
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return 0;
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err_rm:
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v4l2_fh_del(&fh->fh);
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v4l2_fh_exit(&fh->fh);
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err_dec:
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atomic_dec(&mdev->access_ref);
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kfree(fh);
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return ret;
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}
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static int comp_vdev_close(struct file *filp)
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{
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struct comp_fh *fh = filp->private_data;
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struct most_video_dev *mdev = fh->mdev;
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struct mbo *mbo, *tmp;
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/*
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* We need to put MBOs back before we call most_stop_channel()
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* to deallocate MBOs.
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* From the other hand mostcore still calling rx_completion()
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* to deliver MBOs until most_stop_channel() is called.
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* Use mute to work around this issue.
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* This must be implemented in core.
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*/
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spin_lock_irq(&mdev->list_lock);
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mdev->mute = true;
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list_for_each_entry_safe(mbo, tmp, &mdev->pending_mbos, list) {
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list_del(&mbo->list);
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spin_unlock_irq(&mdev->list_lock);
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most_put_mbo(mbo);
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spin_lock_irq(&mdev->list_lock);
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}
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spin_unlock_irq(&mdev->list_lock);
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most_stop_channel(mdev->iface, mdev->ch_idx, &comp);
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mdev->mute = false;
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v4l2_fh_del(&fh->fh);
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v4l2_fh_exit(&fh->fh);
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atomic_dec(&mdev->access_ref);
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kfree(fh);
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return 0;
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}
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static ssize_t comp_vdev_read(struct file *filp, char __user *buf,
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size_t count, loff_t *pos)
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{
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struct comp_fh *fh = filp->private_data;
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struct most_video_dev *mdev = fh->mdev;
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int ret = 0;
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if (*pos)
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return -ESPIPE;
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if (!mdev)
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return -ENODEV;
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/* wait for the first buffer */
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if (!(filp->f_flags & O_NONBLOCK)) {
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if (wait_event_interruptible(mdev->wait_data, data_ready(mdev)))
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return -ERESTARTSYS;
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}
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if (!data_ready(mdev))
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return -EAGAIN;
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while (count > 0 && data_ready(mdev)) {
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struct mbo *const mbo = get_top_mbo(mdev);
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int const rem = mbo->processed_length - fh->offs;
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int const cnt = rem < count ? rem : count;
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if (copy_to_user(buf, mbo->virt_address + fh->offs, cnt)) {
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v4l2_err(&mdev->v4l2_dev, "read: copy_to_user failed\n");
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if (!ret)
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ret = -EFAULT;
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return ret;
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}
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fh->offs += cnt;
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count -= cnt;
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buf += cnt;
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ret += cnt;
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if (cnt >= rem) {
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fh->offs = 0;
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spin_lock_irq(&mdev->list_lock);
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list_del(&mbo->list);
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spin_unlock_irq(&mdev->list_lock);
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most_put_mbo(mbo);
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}
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}
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return ret;
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}
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static __poll_t comp_vdev_poll(struct file *filp, poll_table *wait)
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{
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struct comp_fh *fh = filp->private_data;
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struct most_video_dev *mdev = fh->mdev;
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__poll_t mask = 0;
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/* only wait if no data is available */
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if (!data_ready(mdev))
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poll_wait(filp, &mdev->wait_data, wait);
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if (data_ready(mdev))
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mask |= EPOLLIN | EPOLLRDNORM;
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return mask;
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}
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static void comp_set_format_struct(struct v4l2_format *f)
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{
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f->fmt.pix.width = 8;
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f->fmt.pix.height = 8;
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f->fmt.pix.pixelformat = V4L2_PIX_FMT_MPEG;
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f->fmt.pix.bytesperline = 0;
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f->fmt.pix.sizeimage = 188 * 2;
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f->fmt.pix.colorspace = V4L2_COLORSPACE_REC709;
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f->fmt.pix.field = V4L2_FIELD_NONE;
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f->fmt.pix.priv = 0;
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}
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static int comp_set_format(struct most_video_dev *mdev, unsigned int cmd,
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struct v4l2_format *format)
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{
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if (format->fmt.pix.pixelformat != V4L2_PIX_FMT_MPEG)
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return -EINVAL;
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if (cmd == VIDIOC_TRY_FMT)
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return 0;
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comp_set_format_struct(format);
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return 0;
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}
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static int vidioc_querycap(struct file *file, void *priv,
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struct v4l2_capability *cap)
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{
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struct comp_fh *fh = priv;
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struct most_video_dev *mdev = fh->mdev;
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strlcpy(cap->driver, "v4l2_component", sizeof(cap->driver));
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strlcpy(cap->card, "MOST", sizeof(cap->card));
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snprintf(cap->bus_info, sizeof(cap->bus_info),
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"%s", mdev->iface->description);
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cap->capabilities =
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V4L2_CAP_READWRITE |
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V4L2_CAP_TUNER |
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V4L2_CAP_VIDEO_CAPTURE;
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return 0;
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}
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static int vidioc_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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if (f->index)
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return -EINVAL;
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strcpy(f->description, "MPEG");
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f->type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
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f->flags = V4L2_FMT_FLAG_COMPRESSED;
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f->pixelformat = V4L2_PIX_FMT_MPEG;
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return 0;
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}
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static int vidioc_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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comp_set_format_struct(f);
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return 0;
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}
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static int vidioc_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 comp_fh *fh = priv;
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struct most_video_dev *mdev = fh->mdev;
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return comp_set_format(mdev, VIDIOC_TRY_FMT, f);
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}
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static int vidioc_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 comp_fh *fh = priv;
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struct most_video_dev *mdev = fh->mdev;
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return comp_set_format(mdev, VIDIOC_S_FMT, f);
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}
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static int vidioc_g_std(struct file *file, void *priv, v4l2_std_id *norm)
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{
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*norm = V4L2_STD_UNKNOWN;
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return 0;
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}
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static int vidioc_enum_input(struct file *file, void *priv,
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struct v4l2_input *input)
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{
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struct comp_fh *fh = priv;
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struct most_video_dev *mdev = fh->mdev;
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if (input->index >= V4L2_CMP_MAX_INPUT)
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return -EINVAL;
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strcpy(input->name, "MOST Video");
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input->type |= V4L2_INPUT_TYPE_CAMERA;
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input->audioset = 0;
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input->std = mdev->vdev->tvnorms;
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return 0;
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}
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static int vidioc_g_input(struct file *file, void *priv, unsigned int *i)
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{
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struct comp_fh *fh = priv;
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struct most_video_dev *mdev = fh->mdev;
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*i = mdev->ctrl_input;
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return 0;
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}
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static int vidioc_s_input(struct file *file, void *priv, unsigned int index)
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{
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struct comp_fh *fh = priv;
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struct most_video_dev *mdev = fh->mdev;
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if (index >= V4L2_CMP_MAX_INPUT)
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return -EINVAL;
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mdev->ctrl_input = index;
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return 0;
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}
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static const struct v4l2_file_operations comp_fops = {
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.owner = THIS_MODULE,
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.open = comp_vdev_open,
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.release = comp_vdev_close,
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.read = comp_vdev_read,
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.poll = comp_vdev_poll,
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.unlocked_ioctl = video_ioctl2,
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};
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static const struct v4l2_ioctl_ops video_ioctl_ops = {
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.vidioc_querycap = vidioc_querycap,
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.vidioc_enum_fmt_vid_cap = vidioc_enum_fmt_vid_cap,
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.vidioc_g_fmt_vid_cap = vidioc_g_fmt_vid_cap,
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.vidioc_try_fmt_vid_cap = vidioc_try_fmt_vid_cap,
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.vidioc_s_fmt_vid_cap = vidioc_s_fmt_vid_cap,
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.vidioc_g_std = vidioc_g_std,
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.vidioc_enum_input = vidioc_enum_input,
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.vidioc_g_input = vidioc_g_input,
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.vidioc_s_input = vidioc_s_input,
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};
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static const struct video_device comp_videodev_template = {
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.fops = &comp_fops,
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.release = video_device_release,
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.ioctl_ops = &video_ioctl_ops,
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.tvnorms = V4L2_STD_UNKNOWN,
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};
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/**************************************************************************/
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static struct most_video_dev *get_comp_dev(
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struct most_interface *iface, int channel_idx)
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{
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struct most_video_dev *mdev;
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unsigned long flags;
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spin_lock_irqsave(&list_lock, flags);
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list_for_each_entry(mdev, &video_devices, list) {
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if (mdev->iface == iface && mdev->ch_idx == channel_idx) {
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spin_unlock_irqrestore(&list_lock, flags);
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return mdev;
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}
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}
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spin_unlock_irqrestore(&list_lock, flags);
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return NULL;
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}
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static int comp_rx_data(struct mbo *mbo)
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{
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unsigned long flags;
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struct most_video_dev *mdev =
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get_comp_dev(mbo->ifp, mbo->hdm_channel_id);
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if (!mdev)
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return -EIO;
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spin_lock_irqsave(&mdev->list_lock, flags);
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if (unlikely(mdev->mute)) {
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spin_unlock_irqrestore(&mdev->list_lock, flags);
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return -EIO;
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}
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list_add_tail(&mbo->list, &mdev->pending_mbos);
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spin_unlock_irqrestore(&mdev->list_lock, flags);
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wake_up_interruptible(&mdev->wait_data);
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return 0;
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}
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static int comp_register_videodev(struct most_video_dev *mdev)
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{
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int ret;
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init_waitqueue_head(&mdev->wait_data);
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/* allocate and fill v4l2 video struct */
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mdev->vdev = video_device_alloc();
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if (!mdev->vdev)
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return -ENOMEM;
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/* Fill the video capture device struct */
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*mdev->vdev = comp_videodev_template;
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mdev->vdev->v4l2_dev = &mdev->v4l2_dev;
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mdev->vdev->lock = &mdev->lock;
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snprintf(mdev->vdev->name, sizeof(mdev->vdev->name), "MOST: %s",
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mdev->v4l2_dev.name);
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/* Register the v4l2 device */
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video_set_drvdata(mdev->vdev, mdev);
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ret = video_register_device(mdev->vdev, VFL_TYPE_GRABBER, -1);
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if (ret) {
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v4l2_err(&mdev->v4l2_dev, "video_register_device failed (%d)\n",
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ret);
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video_device_release(mdev->vdev);
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}
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return ret;
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}
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static void comp_unregister_videodev(struct most_video_dev *mdev)
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{
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video_unregister_device(mdev->vdev);
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}
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static void comp_v4l2_dev_release(struct v4l2_device *v4l2_dev)
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{
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struct most_video_dev *mdev =
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container_of(v4l2_dev, struct most_video_dev, v4l2_dev);
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v4l2_device_unregister(v4l2_dev);
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kfree(mdev);
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}
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static int comp_probe_channel(struct most_interface *iface, int channel_idx,
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struct most_channel_config *ccfg, char *name)
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{
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int ret;
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struct most_video_dev *mdev = get_comp_dev(iface, channel_idx);
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if (mdev) {
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pr_err("channel already linked\n");
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return -EEXIST;
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}
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if (ccfg->direction != MOST_CH_RX) {
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pr_err("wrong direction, expect rx\n");
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return -EINVAL;
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}
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if (ccfg->data_type != MOST_CH_SYNC &&
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ccfg->data_type != MOST_CH_ISOC) {
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pr_err("wrong channel type, expect sync or isoc\n");
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return -EINVAL;
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}
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mdev = kzalloc(sizeof(*mdev), GFP_KERNEL);
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if (!mdev)
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return -ENOMEM;
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mutex_init(&mdev->lock);
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atomic_set(&mdev->access_ref, -1);
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spin_lock_init(&mdev->list_lock);
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INIT_LIST_HEAD(&mdev->pending_mbos);
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mdev->iface = iface;
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mdev->ch_idx = channel_idx;
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mdev->v4l2_dev.release = comp_v4l2_dev_release;
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/* Create the v4l2_device */
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strlcpy(mdev->v4l2_dev.name, name, sizeof(mdev->v4l2_dev.name));
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ret = v4l2_device_register(NULL, &mdev->v4l2_dev);
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if (ret) {
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pr_err("v4l2_device_register() failed\n");
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kfree(mdev);
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return ret;
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}
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ret = comp_register_videodev(mdev);
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if (ret)
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goto err_unreg;
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spin_lock_irq(&list_lock);
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list_add(&mdev->list, &video_devices);
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spin_unlock_irq(&list_lock);
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return 0;
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err_unreg:
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v4l2_device_disconnect(&mdev->v4l2_dev);
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v4l2_device_put(&mdev->v4l2_dev);
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return ret;
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}
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static int comp_disconnect_channel(struct most_interface *iface,
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int channel_idx)
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{
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struct most_video_dev *mdev = get_comp_dev(iface, channel_idx);
|
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if (!mdev) {
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pr_err("no such channel is linked\n");
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return -ENOENT;
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}
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spin_lock_irq(&list_lock);
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list_del(&mdev->list);
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spin_unlock_irq(&list_lock);
|
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comp_unregister_videodev(mdev);
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v4l2_device_disconnect(&mdev->v4l2_dev);
|
v4l2_device_put(&mdev->v4l2_dev);
|
return 0;
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}
|
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static struct core_component comp = {
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.name = "video",
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.probe_channel = comp_probe_channel,
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.disconnect_channel = comp_disconnect_channel,
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.rx_completion = comp_rx_data,
|
};
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static int __init comp_init(void)
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{
|
spin_lock_init(&list_lock);
|
return most_register_component(&comp);
|
}
|
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static void __exit comp_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_component()
|
* 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);
|
|
comp_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_component(&comp);
|
BUG_ON(!list_empty(&video_devices));
|
}
|
|
module_init(comp_init);
|
module_exit(comp_exit);
|
|
MODULE_DESCRIPTION("V4L2 Component Module for Mostcore");
|
MODULE_AUTHOR("Andrey Shvetsov <andrey.shvetsov@k2l.de>");
|
MODULE_LICENSE("GPL");
|
