--- /dev/null
+/*
+ * 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
+
+
+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 struct most_aim aim_info;
+
+
+static inline bool data_ready(struct most_video_dev *mdev)
+{
+ return !list_empty(&mdev->pending_mbos);
+}
+
+static inline struct mbo *get_top_mbo(struct most_video_dev *mdev)
+{
+ return list_first_entry(&mdev->pending_mbos, struct mbo, list);
+}
+
+
+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;
+
+ pr_info("aim_vdev_open()\n");
+
+ switch (vdev->vfl_type) {
+ case VFL_TYPE_GRABBER:
+ break;
+ default:
+ return -EINVAL;
+ }
+
+ fh = kzalloc(sizeof(struct aim_fh), GFP_KERNEL);
+ if (!fh)
+ return -ENOMEM;
+
+ if (!atomic_inc_and_test(&mdev->access_ref)) {
+ pr_err("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);
+ if (ret) {
+ pr_err("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;
+}
+
+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;
+
+ pr_info("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(&mdev->list_lock);
+ mdev->mute = true;
+ list_for_each_entry_safe(mbo, tmp, &mdev->pending_mbos, list) {
+ list_del(&mbo->list);
+ spin_unlock(&mdev->list_lock);
+ most_put_mbo(mbo);
+ spin_lock(&mdev->list_lock);
+ }
+ spin_unlock(&mdev->list_lock);
+ most_stop_channel(mdev->iface, mdev->ch_idx);
+ mdev->mute = false;
+
+ v4l2_fh_del(&fh->fh);
+ v4l2_fh_exit(&fh->fh);
+
+ atomic_dec(&mdev->access_ref);
+ kfree(fh);
+ return 0;
+}
+
+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)) {
+ pr_err("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(&mdev->list_lock);
+ list_del(&mbo->list);
+ spin_unlock(&mdev->list_lock);
+ most_put_mbo(mbo);
+ }
+ }
+ return ret;
+}
+
+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;
+}
+
+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;
+}
+
+static int aim_set_format(struct most_video_dev *mdev, unsigned int cmd,
+ struct v4l2_format *format)
+{
+#if 0
+ u32 const pixfmt = format->fmt.pix.pixelformat;
+ const char *fmt;
+
+ if (pixfmt != V4L2_PIX_FMT_MPEG) {
+ if (cmd == VIDIOC_TRY_FMT)
+ fmt = KERN_ERR "try %c%c%c%c failed\n";
+ else
+ fmt = KERN_ERR "set %c%c%c%c failed\n";
+ } else {
+ if (cmd == VIDIOC_TRY_FMT)
+ fmt = KERN_ERR "try %c%c%c%c\n";
+ else
+ fmt = KERN_ERR "set %c%c%c%c\n";
+ }
+ printk(fmt,
+ (pixfmt) & 255,
+ (pixfmt >> 8) & 255,
+ (pixfmt >> 16) & 255,
+ (pixfmt >> 24) & 255);
+#endif
+
+ 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;
+}
+
+
+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;
+
+ pr_info("vidioc_querycap()\n");
+
+ strlcpy(cap->driver, "v4l2_most_aim", sizeof(cap->driver));
+ strlcpy(cap->card, "my_card", 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;
+}
+
+static int vidioc_enum_fmt_vid_cap(struct file *file, void *priv,
+ struct v4l2_fmtdesc *f)
+{
+ pr_info("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;
+}
+
+static int vidioc_g_fmt_vid_cap(struct file *file, void *priv,
+ struct v4l2_format *f)
+{
+ pr_info("vidioc_g_fmt_vid_cap()\n");
+
+ aim_set_format_struct(f);
+ return 0;
+}
+
+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);
+}
+
+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);
+}
+
+static int vidioc_g_std(struct file *file, void *priv, v4l2_std_id *norm)
+{
+ pr_info("vidioc_g_std()\n");
+
+ *norm = V4L2_STD_UNKNOWN;
+ return 0;
+}
+
+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;
+}
+
+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;
+}
+
+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;
+
+ pr_info("vidioc_s_input(%d)\n", index);
+
+ if (index >= V4L2_AIM_MAX_INPUT)
+ return -EINVAL;
+ mdev->ctrl_input = index;
+ return 0;
+}
+
+static 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, *tmp;
+
+ spin_lock(&list_lock);
+ list_for_each_entry_safe(mdev, tmp, &video_devices, list) {
+ if (mdev->iface == iface && mdev->ch_idx == channel_idx) {
+ spin_unlock(&list_lock);
+ return mdev;
+ }
+ }
+ spin_unlock(&list_lock);
+ return 0;
+}
+
+static int aim_rx_data(struct mbo *mbo)
+{
+ struct most_video_dev *mdev =
+ get_aim_dev(mbo->ifp, mbo->hdm_channel_id);
+
+ if (!mdev)
+ return -EIO;
+
+ spin_lock(&mdev->list_lock);
+ if (unlikely(mdev->mute)) {
+ spin_unlock(&mdev->list_lock);
+ return -EIO;
+ }
+
+ list_add_tail(&mbo->list, &mdev->pending_mbos);
+ spin_unlock(&mdev->list_lock);
+ wake_up_interruptible(&mdev->wait_data);
+ return 0;
+}
+
+static int aim_register_videodev(struct most_video_dev *mdev)
+{
+ int retval = -ENOMEM;
+ int ret;
+
+ pr_info("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;
+ strcpy(mdev->vdev->name, "most v4l2 aim video");
+
+ /* Register the v4l2 device */
+ video_set_drvdata(mdev->vdev, mdev);
+ retval = video_register_device(mdev->vdev, VFL_TYPE_GRABBER, -1);
+ if (retval != 0) {
+ pr_err("video_register_device failed (%d)\n", retval);
+ ret = -ENODEV;
+ goto err_vbi_dev;
+ }
+
+ return 0;
+
+err_vbi_dev:
+ video_device_release(mdev->vdev);
+ return ret;
+}
+
+static void aim_unregister_videodev(struct most_video_dev *mdev)
+{
+ pr_info("aim_unregister_videodev()\n");
+
+ video_unregister_device(mdev->vdev);
+}
+
+
+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);
+}
+
+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()\n");
+
+ 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_AVP) {
+ pr_err("wrong channel type, expect sync or isoc_avp\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, "most_video_device",
+ 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(&list_lock);
+ list_add(&mdev->list, &video_devices);
+ spin_unlock(&list_lock);
+ return 0;
+
+err_unreg:
+ v4l2_device_disconnect(&mdev->v4l2_dev);
+ v4l2_device_put(&mdev->v4l2_dev);
+ return ret;
+}
+
+static int aim_disconnect_channel(struct most_interface *iface,
+ int channel_idx)
+{
+ struct most_video_dev *mdev = get_aim_dev(iface, channel_idx);
+
+ pr_info("aim_disconnect_channel()\n");
+
+ if (!mdev) {
+ pr_err("no such channel is linked\n");
+ return -ENOENT;
+ }
+
+ spin_lock(&list_lock);
+ list_del(&mdev->list);
+ spin_unlock(&list_lock);
+
+ aim_unregister_videodev(mdev);
+ v4l2_device_disconnect(&mdev->v4l2_dev);
+ v4l2_device_put(&mdev->v4l2_dev);
+ return 0;
+}
+
+static int __init aim_init(void)
+{
+ spin_lock_init(&list_lock);
+
+ aim_info.name = "v4l";
+ aim_info.probe_channel = aim_probe_channel;
+ aim_info.disconnect_channel = aim_disconnect_channel;
+ aim_info.rx_completion = aim_rx_data;
+ return most_register_aim(&aim_info);
+}
+
+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(&list_lock);
+ list_for_each_entry_safe(mdev, tmp, &video_devices, list) {
+ list_del(&mdev->list);
+ spin_unlock(&list_lock);
+
+ aim_unregister_videodev(mdev);
+ v4l2_device_disconnect(&mdev->v4l2_dev);
+ v4l2_device_put(&mdev->v4l2_dev);
+ }
+ spin_unlock(&list_lock);
+
+ most_deregister_aim(&aim_info);
+ BUG_ON(!list_empty(&video_devices));
+}
+
+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");
projects / linux-beck.git / commitdiff