[linux-2.6-block.git] / drivers / staging / most / video / video.c

// SPDX-License-Identifier: GPL-2.0
/*
 * video.c - V4L2 component for Mostcore
 *
 * Copyright (C) 2015, Microchip Technology Germany II GmbH & Co. KG
 */

#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 "most/core.h"

#define V4L2_CMP_MAX_INPUT  1

static struct core_component comp;

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 comp_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 comp_vdev_open(struct file *filp)
{
	int ret;
	struct video_device *vdev = video_devdata(filp);
	struct most_video_dev *mdev = video_drvdata(filp);
	struct comp_fh *fh;

	v4l2_info(&mdev->v4l2_dev, "comp_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, &comp);
	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 comp_vdev_close(struct file *filp)
{
	struct comp_fh *fh = filp->private_data;
	struct most_video_dev *mdev = fh->mdev;
	struct mbo *mbo, *tmp;

	v4l2_info(&mdev->v4l2_dev, "comp_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, &comp);
	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 comp_vdev_read(struct file *filp, char __user *buf,
			      size_t count, loff_t *pos)
{
	struct comp_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 comp_vdev_poll(struct file *filp, poll_table *wait)
{
	struct comp_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 comp_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 comp_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;

	comp_set_format_struct(format);

	return 0;
}

static int vidioc_querycap(struct file *file, void *priv,
			   struct v4l2_capability *cap)
{
	struct comp_fh *fh = priv;
	struct most_video_dev *mdev = fh->mdev;

	v4l2_info(&mdev->v4l2_dev, "vidioc_querycap()\n");

	strlcpy(cap->driver, "v4l2_component", 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 comp_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 comp_fh *fh = priv;
	struct most_video_dev *mdev = fh->mdev;

	v4l2_info(&mdev->v4l2_dev, "vidioc_g_fmt_vid_cap()\n");

	comp_set_format_struct(f);
	return 0;
}

static int vidioc_try_fmt_vid_cap(struct file *file, void *priv,
				  struct v4l2_format *f)
{
	struct comp_fh *fh = priv;
	struct most_video_dev *mdev = fh->mdev;

	return comp_set_format(mdev, VIDIOC_TRY_FMT, f);
}

static int vidioc_s_fmt_vid_cap(struct file *file, void *priv,
				struct v4l2_format *f)
{
	struct comp_fh *fh = priv;
	struct most_video_dev *mdev = fh->mdev;

	return comp_set_format(mdev, VIDIOC_S_FMT, f);
}

static int vidioc_g_std(struct file *file, void *priv, v4l2_std_id *norm)
{
	struct comp_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 comp_fh *fh = priv;
	struct most_video_dev *mdev = fh->mdev;

	if (input->index >= V4L2_CMP_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 comp_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 comp_fh *fh = priv;
	struct most_video_dev *mdev = fh->mdev;

	v4l2_info(&mdev->v4l2_dev, "vidioc_s_input(%d)\n", index);

	if (index >= V4L2_CMP_MAX_INPUT)
		return -EINVAL;
	mdev->ctrl_input = index;
	return 0;
}

static const struct v4l2_file_operations comp_fops = {
	.owner      = THIS_MODULE,
	.open       = comp_vdev_open,
	.release    = comp_vdev_close,
	.read       = comp_vdev_read,
	.poll       = comp_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 comp_videodev_template = {
	.fops = &comp_fops,
	.release = video_device_release,
	.ioctl_ops = &video_ioctl_ops,
	.tvnorms = V4L2_STD_UNKNOWN,
};

/**************************************************************************/

static struct most_video_dev *get_comp_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 comp_rx_data(struct mbo *mbo)
{
	unsigned long flags;
	struct most_video_dev *mdev =
		get_comp_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 comp_register_videodev(struct most_video_dev *mdev)
{
	int ret;

	v4l2_info(&mdev->v4l2_dev, "comp_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 = comp_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 comp_unregister_videodev(struct most_video_dev *mdev)
{
	v4l2_info(&mdev->v4l2_dev, "comp_unregister_videodev()\n");

	video_unregister_device(mdev->vdev);
}

static void comp_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 comp_probe_channel(struct most_interface *iface, int channel_idx,
			      struct most_channel_config *ccfg, char *name)
{
	int ret;
	struct most_video_dev *mdev = get_comp_dev(iface, channel_idx);

	pr_info("comp_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 = comp_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 = comp_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, "comp_probe_channel() done\n");
	return 0;

err_unreg:
	v4l2_device_disconnect(&mdev->v4l2_dev);
	v4l2_device_put(&mdev->v4l2_dev);
	return ret;
}

static int comp_disconnect_channel(struct most_interface *iface,
				  int channel_idx)
{
	struct most_video_dev *mdev = get_comp_dev(iface, channel_idx);

	if (!mdev) {
		pr_err("no such channel is linked\n");
		return -ENOENT;
	}

	v4l2_info(&mdev->v4l2_dev, "comp_disconnect_channel()\n");

	spin_lock_irq(&list_lock);
	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);
	return 0;
}

static struct core_component comp_info = {
	.name = "video",
	.probe_channel = comp_probe_channel,
	.disconnect_channel = comp_disconnect_channel,
	.rx_completion = comp_rx_data,
};

static int __init comp_init(void)
{
	spin_lock_init(&list_lock);
	return most_register_component(&comp);
}

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_info);
	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");
Commit	Line	Data
	1	// SPDX-License-Identifier: GPL-2.0
	2	/*
	3	* video.c - V4L2 component for Mostcore
	4	*
	5	* Copyright (C) 2015, Microchip Technology Germany II GmbH & Co. KG
	6	*/
	7
	8	#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
	9
	10	#include <linux/module.h>
	11	#include <linux/slab.h>
	12	#include <linux/init.h>
	13	#include <linux/device.h>
	14	#include <linux/suspend.h>
	15	#include <linux/videodev2.h>
	16	#include <linux/mutex.h>
	17	#include <media/v4l2-common.h>
	18	#include <media/v4l2-ioctl.h>
	19	#include <media/v4l2-event.h>
	20	#include <media/v4l2-device.h>
	21	#include <media/v4l2-ctrls.h>
	22	#include <media/v4l2-fh.h>
	23
	24	#include "most/core.h"
	25
	26	#define V4L2_CMP_MAX_INPUT 1
	27
	28	static struct core_component comp;
	29
	30	struct most_video_dev {
	31	struct most_interface *iface;
	32	int ch_idx;
	33	struct list_head list;
	34	bool mute;
	35
	36	struct list_head pending_mbos;
	37	spinlock_t list_lock;
	38
	39	struct v4l2_device v4l2_dev;
	40	atomic_t access_ref;
	41	struct video_device *vdev;
	42	unsigned int ctrl_input;
	43
	44	struct mutex lock;
	45
	46	wait_queue_head_t wait_data;
	47	};
	48
	49	struct comp_fh {
	50	/* must be the first field of this struct! */
	51	struct v4l2_fh fh;
	52	struct most_video_dev *mdev;
	53	u32 offs;
	54	};
	55
	56	static struct list_head video_devices = LIST_HEAD_INIT(video_devices);
	57	static struct spinlock list_lock;
	58
	59	static inline bool data_ready(struct most_video_dev *mdev)
	60	{
	61	return !list_empty(&mdev->pending_mbos);
	62	}
	63
	64	static inline struct mbo get_top_mbo(struct most_video_dev mdev)
	65	{
	66	return list_first_entry(&mdev->pending_mbos, struct mbo, list);
	67	}
	68
	69	static int comp_vdev_open(struct file *filp)
	70	{
	71	int ret;
	72	struct video_device *vdev = video_devdata(filp);
	73	struct most_video_dev *mdev = video_drvdata(filp);
	74	struct comp_fh *fh;
	75
	76	v4l2_info(&mdev->v4l2_dev, "comp_vdev_open()\n");
	77
	78	switch (vdev->vfl_type) {
	79	case VFL_TYPE_GRABBER:
	80	break;
	81	default:
	82	return -EINVAL;
	83	}
	84
	85	fh = kzalloc(sizeof(*fh), GFP_KERNEL);
	86	if (!fh)
	87	return -ENOMEM;
	88
	89	if (!atomic_inc_and_test(&mdev->access_ref)) {
	90	v4l2_err(&mdev->v4l2_dev, "too many clients\n");
	91	ret = -EBUSY;
	92	goto err_dec;
	93	}
	94
	95	fh->mdev = mdev;
	96	v4l2_fh_init(&fh->fh, vdev);
	97	filp->private_data = fh;
	98
	99	v4l2_fh_add(&fh->fh);
	100
	101	ret = most_start_channel(mdev->iface, mdev->ch_idx, &comp);
	102	if (ret) {
	103	v4l2_err(&mdev->v4l2_dev, "most_start_channel() failed\n");
	104	goto err_rm;
	105	}
	106
	107	return 0;
	108
	109	err_rm:
	110	v4l2_fh_del(&fh->fh);
	111	v4l2_fh_exit(&fh->fh);
	112
	113	err_dec:
	114	atomic_dec(&mdev->access_ref);
	115	kfree(fh);
	116	return ret;
	117	}
	118
	119	static int comp_vdev_close(struct file *filp)
	120	{
	121	struct comp_fh *fh = filp->private_data;
	122	struct most_video_dev *mdev = fh->mdev;
	123	struct mbo mbo, tmp;
	124
	125	v4l2_info(&mdev->v4l2_dev, "comp_vdev_close()\n");
	126
	127	/*
	128	* We need to put MBOs back before we call most_stop_channel()
	129	* to deallocate MBOs.
	130	* From the other hand mostcore still calling rx_completion()
	131	* to deliver MBOs until most_stop_channel() is called.
	132	* Use mute to work around this issue.
	133	* This must be implemented in core.
	134	*/
	135
	136	spin_lock_irq(&mdev->list_lock);
	137	mdev->mute = true;
	138	list_for_each_entry_safe(mbo, tmp, &mdev->pending_mbos, list) {
	139	list_del(&mbo->list);
	140	spin_unlock_irq(&mdev->list_lock);
	141	most_put_mbo(mbo);
	142	spin_lock_irq(&mdev->list_lock);
	143	}
	144	spin_unlock_irq(&mdev->list_lock);
	145	most_stop_channel(mdev->iface, mdev->ch_idx, &comp);
	146	mdev->mute = false;
	147
	148	v4l2_fh_del(&fh->fh);
	149	v4l2_fh_exit(&fh->fh);
	150
	151	atomic_dec(&mdev->access_ref);
	152	kfree(fh);
	153	return 0;
	154	}
	155
	156	static ssize_t comp_vdev_read(struct file filp, char __user buf,
	157	size_t count, loff_t *pos)
	158	{
	159	struct comp_fh *fh = filp->private_data;
	160	struct most_video_dev *mdev = fh->mdev;
	161	int ret = 0;
	162
	163	if (*pos)
	164	return -ESPIPE;
	165
	166	if (!mdev)
	167	return -ENODEV;
	168
	169	/* wait for the first buffer */
	170	if (!(filp->f_flags & O_NONBLOCK)) {
	171	if (wait_event_interruptible(mdev->wait_data, data_ready(mdev)))
	172	return -ERESTARTSYS;
	173	}
	174
	175	if (!data_ready(mdev))
	176	return -EAGAIN;
	177
	178	while (count > 0 && data_ready(mdev)) {
	179	struct mbo *const mbo = get_top_mbo(mdev);
	180	int const rem = mbo->processed_length - fh->offs;
	181	int const cnt = rem < count ? rem : count;
	182
	183	if (copy_to_user(buf, mbo->virt_address + fh->offs, cnt)) {
	184	v4l2_err(&mdev->v4l2_dev, "read: copy_to_user failed\n");
	185	if (!ret)
	186	ret = -EFAULT;
	187	return ret;
	188	}
	189
	190	fh->offs += cnt;
	191	count -= cnt;
	192	buf += cnt;
	193	ret += cnt;
	194
	195	if (cnt >= rem) {
	196	fh->offs = 0;
	197	spin_lock_irq(&mdev->list_lock);
	198	list_del(&mbo->list);
	199	spin_unlock_irq(&mdev->list_lock);
	200	most_put_mbo(mbo);
	201	}
	202	}
	203	return ret;
	204	}
	205
	206	static unsigned int comp_vdev_poll(struct file filp, poll_table wait)
	207	{
	208	struct comp_fh *fh = filp->private_data;
	209	struct most_video_dev *mdev = fh->mdev;
	210	unsigned int mask = 0;
	211
	212	/* only wait if no data is available */
	213	if (!data_ready(mdev))
	214	poll_wait(filp, &mdev->wait_data, wait);
	215	if (data_ready(mdev))
	216	mask \|= POLLIN \| POLLRDNORM;
	217
	218	return mask;
	219	}
	220
	221	static void comp_set_format_struct(struct v4l2_format *f)
	222	{
	223	f->fmt.pix.width = 8;
	224	f->fmt.pix.height = 8;
	225	f->fmt.pix.pixelformat = V4L2_PIX_FMT_MPEG;
	226	f->fmt.pix.bytesperline = 0;
	227	f->fmt.pix.sizeimage = 188 * 2;
	228	f->fmt.pix.colorspace = V4L2_COLORSPACE_REC709;
	229	f->fmt.pix.field = V4L2_FIELD_NONE;
	230	f->fmt.pix.priv = 0;
	231	}
	232
	233	static int comp_set_format(struct most_video_dev *mdev, unsigned int cmd,
	234	struct v4l2_format *format)
	235	{
	236	if (format->fmt.pix.pixelformat != V4L2_PIX_FMT_MPEG)
	237	return -EINVAL;
	238
	239	if (cmd == VIDIOC_TRY_FMT)
	240	return 0;
	241
	242	comp_set_format_struct(format);
	243
	244	return 0;
	245	}
	246
	247	static int vidioc_querycap(struct file file, void priv,
	248	struct v4l2_capability *cap)
	249	{
	250	struct comp_fh *fh = priv;
	251	struct most_video_dev *mdev = fh->mdev;
	252
	253	v4l2_info(&mdev->v4l2_dev, "vidioc_querycap()\n");
	254
	255	strlcpy(cap->driver, "v4l2_component", sizeof(cap->driver));
	256	strlcpy(cap->card, "MOST", sizeof(cap->card));
	257	snprintf(cap->bus_info, sizeof(cap->bus_info),
	258	"%s", mdev->iface->description);
	259
	260	cap->capabilities =
	261	V4L2_CAP_READWRITE \|
	262	V4L2_CAP_TUNER \|
	263	V4L2_CAP_VIDEO_CAPTURE;
	264	return 0;
	265	}
	266
	267	static int vidioc_enum_fmt_vid_cap(struct file file, void priv,
	268	struct v4l2_fmtdesc *f)
	269	{
	270	struct comp_fh *fh = priv;
	271	struct most_video_dev *mdev = fh->mdev;
	272
	273	v4l2_info(&mdev->v4l2_dev, "vidioc_enum_fmt_vid_cap() %d\n", f->index);
	274
	275	if (f->index)
	276	return -EINVAL;
	277
	278	strcpy(f->description, "MPEG");
	279	f->type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
	280	f->flags = V4L2_FMT_FLAG_COMPRESSED;
	281	f->pixelformat = V4L2_PIX_FMT_MPEG;
	282
	283	return 0;
	284	}
	285
	286	static int vidioc_g_fmt_vid_cap(struct file file, void priv,
	287	struct v4l2_format *f)
	288	{
	289	struct comp_fh *fh = priv;
	290	struct most_video_dev *mdev = fh->mdev;
	291
	292	v4l2_info(&mdev->v4l2_dev, "vidioc_g_fmt_vid_cap()\n");
	293
	294	comp_set_format_struct(f);
	295	return 0;
	296	}
	297
	298	static int vidioc_try_fmt_vid_cap(struct file file, void priv,
	299	struct v4l2_format *f)
	300	{
	301	struct comp_fh *fh = priv;
	302	struct most_video_dev *mdev = fh->mdev;
	303
	304	return comp_set_format(mdev, VIDIOC_TRY_FMT, f);
	305	}
	306
	307	static int vidioc_s_fmt_vid_cap(struct file file, void priv,
	308	struct v4l2_format *f)
	309	{
	310	struct comp_fh *fh = priv;
	311	struct most_video_dev *mdev = fh->mdev;
	312
	313	return comp_set_format(mdev, VIDIOC_S_FMT, f);
	314	}
	315
	316	static int vidioc_g_std(struct file file, void priv, v4l2_std_id *norm)
	317	{
	318	struct comp_fh *fh = priv;
	319	struct most_video_dev *mdev = fh->mdev;
	320
	321	v4l2_info(&mdev->v4l2_dev, "vidioc_g_std()\n");
	322
	323	*norm = V4L2_STD_UNKNOWN;
	324	return 0;
	325	}
	326
	327	static int vidioc_enum_input(struct file file, void priv,
	328	struct v4l2_input *input)
	329	{
	330	struct comp_fh *fh = priv;
	331	struct most_video_dev *mdev = fh->mdev;
	332
	333	if (input->index >= V4L2_CMP_MAX_INPUT)
	334	return -EINVAL;
	335
	336	strcpy(input->name, "MOST Video");
	337	input->type \|= V4L2_INPUT_TYPE_CAMERA;
	338	input->audioset = 0;
	339
	340	input->std = mdev->vdev->tvnorms;
	341
	342	return 0;
	343	}
	344
	345	static int vidioc_g_input(struct file file, void priv, unsigned int *i)
	346	{
	347	struct comp_fh *fh = priv;
	348	struct most_video_dev *mdev = fh->mdev;
	349	*i = mdev->ctrl_input;
	350	return 0;
	351	}
	352
	353	static int vidioc_s_input(struct file file, void priv, unsigned int index)
	354	{
	355	struct comp_fh *fh = priv;
	356	struct most_video_dev *mdev = fh->mdev;
	357
	358	v4l2_info(&mdev->v4l2_dev, "vidioc_s_input(%d)\n", index);
	359
	360	if (index >= V4L2_CMP_MAX_INPUT)
	361	return -EINVAL;
	362	mdev->ctrl_input = index;
	363	return 0;
	364	}
	365
	366	static const struct v4l2_file_operations comp_fops = {
	367	.owner = THIS_MODULE,
	368	.open = comp_vdev_open,
	369	.release = comp_vdev_close,
	370	.read = comp_vdev_read,
	371	.poll = comp_vdev_poll,
	372	.unlocked_ioctl = video_ioctl2,
	373	};
	374
	375	static const struct v4l2_ioctl_ops video_ioctl_ops = {
	376	.vidioc_querycap = vidioc_querycap,
	377	.vidioc_enum_fmt_vid_cap = vidioc_enum_fmt_vid_cap,
	378	.vidioc_g_fmt_vid_cap = vidioc_g_fmt_vid_cap,
	379	.vidioc_try_fmt_vid_cap = vidioc_try_fmt_vid_cap,
	380	.vidioc_s_fmt_vid_cap = vidioc_s_fmt_vid_cap,
	381	.vidioc_g_std = vidioc_g_std,
	382	.vidioc_enum_input = vidioc_enum_input,
	383	.vidioc_g_input = vidioc_g_input,
	384	.vidioc_s_input = vidioc_s_input,
	385	};
	386
	387	static const struct video_device comp_videodev_template = {
	388	.fops = &comp_fops,
	389	.release = video_device_release,
	390	.ioctl_ops = &video_ioctl_ops,
	391	.tvnorms = V4L2_STD_UNKNOWN,
	392	};
	393
	394	/**************************************************************************/
	395
	396	static struct most_video_dev *get_comp_dev(
	397	struct most_interface *iface, int channel_idx)
	398	{
	399	struct most_video_dev *mdev;
	400	unsigned long flags;
	401
	402	spin_lock_irqsave(&list_lock, flags);
	403	list_for_each_entry(mdev, &video_devices, list) {
	404	if (mdev->iface == iface && mdev->ch_idx == channel_idx) {
	405	spin_unlock_irqrestore(&list_lock, flags);
	406	return mdev;
	407	}
	408	}
	409	spin_unlock_irqrestore(&list_lock, flags);
	410	return NULL;
	411	}
	412
	413	static int comp_rx_data(struct mbo *mbo)
	414	{
	415	unsigned long flags;
	416	struct most_video_dev *mdev =
	417	get_comp_dev(mbo->ifp, mbo->hdm_channel_id);
	418
	419	if (!mdev)
	420	return -EIO;
	421
	422	spin_lock_irqsave(&mdev->list_lock, flags);
	423	if (unlikely(mdev->mute)) {
	424	spin_unlock_irqrestore(&mdev->list_lock, flags);
	425	return -EIO;
	426	}
	427
	428	list_add_tail(&mbo->list, &mdev->pending_mbos);
	429	spin_unlock_irqrestore(&mdev->list_lock, flags);
	430	wake_up_interruptible(&mdev->wait_data);
	431	return 0;
	432	}
	433
	434	static int comp_register_videodev(struct most_video_dev *mdev)
	435	{
	436	int ret;
	437
	438	v4l2_info(&mdev->v4l2_dev, "comp_register_videodev()\n");
	439
	440	init_waitqueue_head(&mdev->wait_data);
	441
	442	/* allocate and fill v4l2 video struct */
	443	mdev->vdev = video_device_alloc();
	444	if (!mdev->vdev)
	445	return -ENOMEM;
	446
	447	/* Fill the video capture device struct */
	448	*mdev->vdev = comp_videodev_template;
	449	mdev->vdev->v4l2_dev = &mdev->v4l2_dev;
	450	mdev->vdev->lock = &mdev->lock;
	451	snprintf(mdev->vdev->name, sizeof(mdev->vdev->name), "MOST: %s",
	452	mdev->v4l2_dev.name);
	453
	454	/* Register the v4l2 device */
	455	video_set_drvdata(mdev->vdev, mdev);
	456	ret = video_register_device(mdev->vdev, VFL_TYPE_GRABBER, -1);
	457	if (ret) {
	458	v4l2_err(&mdev->v4l2_dev, "video_register_device failed (%d)\n",
	459	ret);
	460	video_device_release(mdev->vdev);
	461	}
	462
	463	return ret;
	464	}
	465
	466	static void comp_unregister_videodev(struct most_video_dev *mdev)
	467	{
	468	v4l2_info(&mdev->v4l2_dev, "comp_unregister_videodev()\n");
	469
	470	video_unregister_device(mdev->vdev);
	471	}
	472
	473	static void comp_v4l2_dev_release(struct v4l2_device *v4l2_dev)
	474	{
	475	struct most_video_dev *mdev =
	476	container_of(v4l2_dev, struct most_video_dev, v4l2_dev);
	477
	478	v4l2_device_unregister(v4l2_dev);
	479	kfree(mdev);
	480	}
	481
	482	static int comp_probe_channel(struct most_interface *iface, int channel_idx,
	483	struct most_channel_config ccfg, char name)
	484	{
	485	int ret;
	486	struct most_video_dev *mdev = get_comp_dev(iface, channel_idx);
	487
	488	pr_info("comp_probe_channel(%s)\n", name);
	489
	490	if (mdev) {
	491	pr_err("channel already linked\n");
	492	return -EEXIST;
	493	}
	494
	495	if (ccfg->direction != MOST_CH_RX) {
	496	pr_err("wrong direction, expect rx\n");
	497	return -EINVAL;
	498	}
	499
	500	if (ccfg->data_type != MOST_CH_SYNC &&
	501	ccfg->data_type != MOST_CH_ISOC) {
	502	pr_err("wrong channel type, expect sync or isoc\n");
	503	return -EINVAL;
	504	}
	505
	506	mdev = kzalloc(sizeof(*mdev), GFP_KERNEL);
	507	if (!mdev)
	508	return -ENOMEM;
	509
	510	mutex_init(&mdev->lock);
	511	atomic_set(&mdev->access_ref, -1);
	512	spin_lock_init(&mdev->list_lock);
	513	INIT_LIST_HEAD(&mdev->pending_mbos);
	514	mdev->iface = iface;
	515	mdev->ch_idx = channel_idx;
	516	mdev->v4l2_dev.release = comp_v4l2_dev_release;
	517
	518	/* Create the v4l2_device */
	519	strlcpy(mdev->v4l2_dev.name, name, sizeof(mdev->v4l2_dev.name));
	520	ret = v4l2_device_register(NULL, &mdev->v4l2_dev);
	521	if (ret) {
	522	pr_err("v4l2_device_register() failed\n");
	523	kfree(mdev);
	524	return ret;
	525	}
	526
	527	ret = comp_register_videodev(mdev);
	528	if (ret)
	529	goto err_unreg;
	530
	531	spin_lock_irq(&list_lock);
	532	list_add(&mdev->list, &video_devices);
	533	spin_unlock_irq(&list_lock);
	534	v4l2_info(&mdev->v4l2_dev, "comp_probe_channel() done\n");
	535	return 0;
	536
	537	err_unreg:
	538	v4l2_device_disconnect(&mdev->v4l2_dev);
	539	v4l2_device_put(&mdev->v4l2_dev);
	540	return ret;
	541	}
	542
	543	static int comp_disconnect_channel(struct most_interface *iface,
	544	int channel_idx)
	545	{
	546	struct most_video_dev *mdev = get_comp_dev(iface, channel_idx);
	547
	548	if (!mdev) {
	549	pr_err("no such channel is linked\n");
	550	return -ENOENT;
	551	}
	552
	553	v4l2_info(&mdev->v4l2_dev, "comp_disconnect_channel()\n");
	554
	555	spin_lock_irq(&list_lock);
	556	list_del(&mdev->list);
	557	spin_unlock_irq(&list_lock);
	558
	559	comp_unregister_videodev(mdev);
	560	v4l2_device_disconnect(&mdev->v4l2_dev);
	561	v4l2_device_put(&mdev->v4l2_dev);
	562	return 0;
	563	}
	564
	565	static struct core_component comp_info = {
	566	.name = "video",
	567	.probe_channel = comp_probe_channel,
	568	.disconnect_channel = comp_disconnect_channel,
	569	.rx_completion = comp_rx_data,
	570	};
	571
	572	static int __init comp_init(void)
	573	{
	574	spin_lock_init(&list_lock);
	575	return most_register_component(&comp);
	576	}
	577
	578	static void __exit comp_exit(void)
	579	{
	580	struct most_video_dev mdev, tmp;
	581
	582	/*
	583	* As the mostcore currently doesn't call disconnect_channel()
	584	* for linked channels while we call most_deregister_component()
	585	* we simulate this call here.
	586	* This must be fixed in core.
	587	*/
	588	spin_lock_irq(&list_lock);
	589	list_for_each_entry_safe(mdev, tmp, &video_devices, list) {
	590	list_del(&mdev->list);
	591	spin_unlock_irq(&list_lock);
	592
	593	comp_unregister_videodev(mdev);
	594	v4l2_device_disconnect(&mdev->v4l2_dev);
	595	v4l2_device_put(&mdev->v4l2_dev);
	596	spin_lock_irq(&list_lock);
	597	}
	598	spin_unlock_irq(&list_lock);
	599
	600	most_deregister_component(&comp_info);
	601	BUG_ON(!list_empty(&video_devices));
	602	}
	603
	604	module_init(comp_init);
	605	module_exit(comp_exit);
	606
	607	MODULE_DESCRIPTION("V4L2 Component Module for Mostcore");
	608	MODULE_AUTHOR("Andrey Shvetsov <andrey.shvetsov@k2l.de>");
	609	MODULE_LICENSE("GPL");