| /* |
| * 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); |
| } |
| |
| 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; |
| |
| 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; |
| } |
| |
| 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; |
| } |
| |
| 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; |
| } |
| |
| 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 (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; |
| |
| 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; |
| } |
| |
| 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; |
| } |
| |
| 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; |
| } |
| |
| 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) |
| { |
| 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; |
| } |
| |
| 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; |
| |
| 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; |
| } |
| |
| 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; |
| } |
| |
| 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; |
| } |
| |
| 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; |
| } |
| |
| static void aim_unregister_videodev(struct most_video_dev *mdev) |
| { |
| v4l2_info(&mdev->v4l2_dev, "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(%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; |
| } |
| |
| 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; |
| } |
| |
| 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); |
| } |
| |
| 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)); |
| } |
| |
| 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"); |