diff options
Diffstat (limited to 'driver/aim-v4l2')
| -rw-r--r-- | driver/aim-v4l2/video.c | 616 |
1 files changed, 616 insertions, 0 deletions
diff --git a/driver/aim-v4l2/video.c b/driver/aim-v4l2/video.c new file mode 100644 index 0000000..150dc89 --- /dev/null +++ b/driver/aim-v4l2/video.c @@ -0,0 +1,616 @@ +/* + * 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 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_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, 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"); |